WO2005063496A1 - 感熱転写記録用二軸配向白色ポリプロピレンフィルムおよびそれからなる感熱転写記録用受容シート - Google Patents
感熱転写記録用二軸配向白色ポリプロピレンフィルムおよびそれからなる感熱転写記録用受容シート Download PDFInfo
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- WO2005063496A1 WO2005063496A1 PCT/JP2004/019052 JP2004019052W WO2005063496A1 WO 2005063496 A1 WO2005063496 A1 WO 2005063496A1 JP 2004019052 W JP2004019052 W JP 2004019052W WO 2005063496 A1 WO2005063496 A1 WO 2005063496A1
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- resin
- thermal transfer
- transfer recording
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/41—Base layers supports or substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/32—Thermal receivers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
Definitions
- Biaxially oriented white polypropylene film for thermal transfer recording and receiving sheet for thermal transfer recording comprising the same
- the present invention relates to a biaxially oriented white polypropylene film for thermal transfer recording and a receiving sheet for thermal transfer recording using the same. More specifically, the heat-sensitive transfer recording receiving sheet using the white film of the present invention as a base material has a high sensitivity, is excellent in fold resistance, surface quality, processability, and has these characteristics and the characteristics of the film production.
- a biaxially oriented white polypropylene film for thermal transfer recording (hereinafter sometimes abbreviated simply as a white film) and a thermal transfer using it that are both highly productive and optimal as a substrate for a thermal transfer recording receiving sheet.
- the present invention relates to a recording receiving sheet.
- a thermal transfer recording method which has features such as non-impact, easy operation and maintenance, low cost, and downsizing, has attracted attention.
- an ink ribbon having an ink layer which is a color material-containing layer, is superimposed on a receiving sheet, and the ink is transferred by melting or sublimation according to the heating of the thermal head from the ink ribbon side.
- the colorant-containing component or colorant is transferred onto the receiving sheet in the form of fine dots (dots) and printed.
- a receiving sheet for thermal transfer recording is processed or printed (also referred to as printing) on the obtained receiving sheet, the load due to heat received by the receiving sheet is increasing.
- the processing speed is high, the processing conditions are severe, and the size of the printing apparatus tends to be reduced. Therefore, the environment in which the printing base material (thermal transfer recording receiving sheet) is used is becoming severer year by year. Against the background of changes in the environment in which the printing base material including these thermal transfer recording sheets is used, white films applied to the base material are exemplified by folding and wrinkle resistance while satisfying whiteness and cushioning rate. There is a strong demand for excellent processability, improved transferability (sensitivity), and high productivity (low cost).
- an incompatible resin such as inorganic particles or a polyester resin is contained in polypropylene and stretched.
- an interface between the polypropylene and the inorganic particles or the incompatible resin has been peeled off, and a white film having voids has been applied (for example, see Patent Documents 18 to 18).
- a ⁇ crystal having a low crystal density (crystal density: 0.1%) is contained in the unstretched sheet. 922 g / cm 3 ), and by stretching it, it is transformed into crystallization with a high crystal density (crystal density: 0.936 g / cm 3 ), and a void is formed by the difference between the two crystal densities.
- a white film or a microporous film using the ⁇ crystal transition and a method for producing the same, for example, a polypropylene sheet composed of polypropylene and a polymer having a higher melt crystallization temperature than polypropylene and a ⁇ crystal nucleating agent is used.
- the method for producing a microporous film that is obtained by stretching a resin (see Patent Document 9), melt-extruding a resin composition of polypropylene of a specific composition and an amide ⁇ -nucleating agent, and crystallizing and stretching under specific conditions It has a manufacturing method (see Patent Document 10), a specific pore size, a specific nitrogen permeability coefficient, uniform in-plane mechanical performance, a specific stretching strength, and a crystal ratio ( ⁇ value) measured under specific conditions.
- a microporous film obtained by biaxially stretching a sheet (see Patent Document 11), containing polypropylene and an i3 nucleating agent, providing a specified range of thickness uniformity, and a specific cross section Production method of microporous film having melt structure (see Patent Document 12) or a resin composition of polypropylene, polyethylene and ⁇ crystal nucleating agent of specific composition, followed by stretching under specific conditions (See p. 13) and a white film in which a heat-sealable skin layer or a printable skin layer is laminated on at least one side of a core layer composed of an orientation-promoting polymer, homopolypropylene, and ⁇ -crystal nucleating agent. Layers with specific specific gravity, optical density, cushion ratio, specific amorphous resin, ⁇ -crystal ratio in specific range and non-nucleated void White film (see Patent Document 16).
- Patent Document 1 Japanese Patent No. 2599934 (Claim 1)
- Patent Document 2 Japanese Patent No. 1748101 (Claims 1-115)
- Patent Document 3 JP-A-11-343357 (Claims 1-4)
- Patent Document 4 Japanese Patent No. 2611392 (Claims 1 and 2)
- Patent Document 5 Japanese Patent No. 2917331 (Claims 1-4)
- Patent Document 6 Japanese Patent No. 2964608 (Claims 1 to 5)
- Patent Document 7 Patent No. 2735989 (Claims 1 and 2)
- Patent Document 8 Patent No. 2651469 (Claims 1 and 2)
- Patent Document 9 Patent No. 1974511 (Claim 1)
- Patent Document 10 Japanese Patent No. 3443934 (Claims 1 to 5)
- Patent Document 11 Patent No. 2509030 (Claims 1 to 8)
- Patent Document 12 International Publication 02/66233 Pamphlet (Claims 11-11)
- Patent Document 13 Japanese Patent No. 3523404 (Claim 1)
- Patent Document 14 International Publication 03/93003 Pamphlet (Claims 1-129)
- Patent Document 15 International Publication 03/93004 Pamphlet (Claims 1 to 23)
- Patent Document 16 JP 2004-142321 A (Claims 1 to 8)
- voids formed by the incompatible resin are large and have few voids. That is, since the voids are coarse, the sum of the strength (F2 value) at 2% elongation in the longitudinal direction (MD) and the width direction (TD) of the film is too high, resulting in poor flexibility and poor wrinkle resistance. There was a problem, and there was a problem that it was too low and the process passability was poor. Further, there is a problem that the sensitivity of the receiving sheet for thermal transfer recording using the base material having a low cushion rate is low. [0010] As described above, the white film used as the base material of the thermal transfer recording receiving sheet, as described above,
- the microporous film obtained in Patent Documents 9-113 has through-holes on the front and back surfaces of the film, that is, has permeability, but because of the through-holes, the force and the smoothness of the film surface deteriorate. Or the surface gloss may be reduced. Therefore, the thermal transfer recording receiving sheet using such a film may have poor surface quality.
- the receiving layer is often provided by a coating method. In such a film having such a permeability, the coating agent penetrates into the film, and the receiving layer cannot be formed successfully. In addition, the sum of the strength (F2 value) at 2% elongation in the longitudinal direction and the width direction of the film was too high, resulting in poor flexibility and poor cracking.
- the temperature of the metal drum to 100 ° C-130 ° C. Is often preferred.
- solidification of the unstretched sheet takes a long time, so that there is a problem that the holding time on the drum becomes long and the productivity becomes low.
- Another problem is that large j3 spherulites are formed in the skin layer, and crater-like defects are generated in the skin layer after biaxial stretching due to / 3 crystal transition.
- a high-quality white film could not be manufactured as a sheet base. That is, the above film did not simultaneously satisfy the quality that can be used as the base material of the receiving sheet for thermal transfer recording and the industrial level productivity.
- the white film obtained in Patent Document 16 has an amorphous phase incompatible with polypropylene in the core layer. Since the conductive resin was used, coarse voids were formed as in the case of the conventional white film, and the sensitivity of the thermal transfer recording receiving sheet using the film as a substrate was low.
- the productivity in the film-forming process is high, the processability is excellent in the production process of the thermal transfer recording receiving sheet, the core layer has a coreless void, and is flexible and has a low specific gravity.
- the core layer has a coreless void, and is flexible and has a low specific gravity.
- An object of the present invention is to provide an axially oriented white polypropylene film and a thermal transfer recording receiving sheet using the same.
- the present invention mainly has the following configurations in order to solve the above problems.
- Biaxially oriented white polypropylene film for recording (first form).
- the biaxially oriented white polypropylene film for thermal transfer recording characterized in that the sum of the strength (F2 value) at 2% elongation in the longitudinal direction and the width direction is in the range of 30 lOOMPa and has ⁇ -crystal activity ( Third form).
- a skin layer (B layer) having a half-crystallization time of 60 seconds or less and a surface gloss of 30 to 145% is provided on at least one side of a layer of a polypropylene resin having a substantially nuclear-free void.
- a thermal transfer recording receiving sheet having a receiving layer provided on at least one surface of the white film, and in the thermal transfer recording receiving sheet, an anchor layer is provided between the receiving layer and the film;
- the anchor layer is characterized by comprising at least one kind of resin selected from an acrylic resin, a polyester resin, and a polyurethane resin.
- a receiving sheet for thermal transfer recording can be provided.
- the white film of the present invention has a large number of substantially nonnucleated voids, has a low specific gravity, and has a high whiteness, an optical density, and a high cushion ratio.
- images with high sensitivity of the receiving sheet can be printed clearly.
- the white film of the present invention is flexible and has good slipperiness, and is excellent in breaking wrinkle resistance as compared with a conventional white film. From the above, the workability is excellent.
- the voids are substantially free of nuclei, the void forming agent does not fall off in the film forming process and the receiving sheet manufacturing process. From the above, the productivity is excellent.
- the white film of the present invention provides excellent dimensional stability by setting the sum of the melting temperature of the polypropylene resin and the strength (F2 value) at 2% elongation in the longitudinal and width directions within an appropriate range.
- the receiving sheet for thermal transfer recording using the film as a base material also has excellent dimensional stability.
- FIG. 1 is an electron microscope (SEM) photograph of a conventional white film having a core at a magnification of 1500 times (white film having a core).
- FIG. 2 is an electron microscope (SEM) photograph of a biaxially oriented white polypropylene film for thermal transfer recording of the present invention at a magnification of 800 times in cross section (nuclear white film of the present invention).
- FIG. 3 shows a model model of the endothermic peak associated with the melting of polypropylene when the crystal ratio was determined by the above evaluation method (3) using a scanning differential calorimeter (DSC).
- DSC scanning differential calorimeter
- FIG. 4 shows the heat of fusion ( ⁇ -l) of the endothermic peak associated with the melting of the polypropylene-derived j3 crystal with a peak between 140 ° C and 160 ° C in Fig. 3;
- FIG. 4 is a graph showing the heat of fusion ( ⁇ -2) of an endothermic peak accompanying melting of a polypropylene-derived crystal other than ⁇ -crystal having a peak.
- FIG. 5 is a photograph of a talter-like defect formed on a film surface obtained from a white film not according to the present invention.
- the best mode for obtaining the film of the present invention and the case where the biaxially oriented white propylene film of the present invention (hereinafter sometimes simply referred to as a white film) is applied to a heat-sensitive transfer recording receiving sheet Will be described as an example.
- the A layer of the white film of the first embodiment and the white film of the second to fourth embodiments of the present invention (hereinafter sometimes simply referred to as the "A layer") has a substantially nuclear-free void.
- the “nucleus-free void” refers to a void having no nucleus (void-forming agent) for forming a void by stretching. In such a seedless void, nothing is observed in the void in the cross-sectional image when the cross section of the film is observed with a scanning electron microscope (SEM).
- nucleated void having a nucleus in the void, that is, formed by a nucleus (void-forming agent), Spherical, fibrous, irregular, or other shaped nuclei are observed in the voids.
- “having a substantially nuclear-free void” is defined as follows, when a cross section of a film adjusted under a specific condition is observed under a specific condition using a scanning electron microscope (SEM). Then, the total number of voids per 1000 ⁇ m 2 and the number of voids having nuclei were measured, and the ratio (percentage) of voids having nuclei to all voids was defined as 5% or less. The case is defined as having no nuclear void.
- the object of the present invention is achieved if the force S, which may be detected as a non-nucleated void by the above method even in the void having an original nucleus, and the ratio of voids having no nucleus are within the above ranges. You.
- the film Since there are few coarse voids, the film has excellent breaking wrinkle resistance even as a film having a low specific gravity.
- the A layer of the white film of the first embodiment or the white film of the second embodiment of the present invention is made of a polypropylene resin.
- the fact that the A layer is made of a polypropylene resin means that all the resins constituting the A layer are polypropylene, but as long as the effects of the present invention are achieved, the A layer may be, for example, exemplified below. Resin and additives other than polypropylene as described above.
- the entire material constituting the layer A may be simply referred to as the entire resin of the layer A in some cases.
- the A layer of the white film of the first embodiment or the white film of the second embodiment of the present invention comprises: It consists of a polypropylene resin with a ⁇ crystal ratio of 30% or more and a melting temperature of 140-172 ° C. More preferably, it is a polypropylene resin having a melting temperature in the range of 150 to 170 ° C, so that the film forming property is stable and the coating property of the receiving layer is stable. If the melting temperature is lower than 140 ° C., when used as a thermal transfer recording receiving sheet, the recording paper may contract and curl due to heat during transfer, which may be undesirable.
- the polypropylene resin having a melting temperature of 140 172 ° C. in the first and second embodiments of the present invention or the polypropylene resin of the A layer in the third and fourth embodiments is a homopolypropylene or a propylene other than propylene. It is obtained by random or block copolymerization of two components, for example, butene, hexene, otaten, etc., as 5% by weight or less as ethylene or olefin.
- the following elastomer component is added to the above polypropylene resin, the stretching stress during film formation and the effect of accelerating void formation can be obtained.
- linear low-density polyethylene m-LLDPE
- ultra-low-density polyethylene VLDPE
- ethylene- ⁇ -olefin copolymers by the meta-mouth catalyst method include ethylene butene rubber (EBR) and ethylene-propylene rubber (EPR), propylene butene rubber (PBR), ethylene biel acetate (EVA), ethylene monoethacrylate (EEA), ethylene monomethyl methacrylate (EMMA), ethylene propylene-gen copolymer (EPDM), isoprene Rubber (IR), styrene-based copolymers such as styrene-butadiene rubber (SBR), hydrogenated styrene-butadiene rubber (H-SBR), styrene-butylene-styrene copolymer (SBS), and styrene-ethylenebutylene Styrene copolymer (SEBS) is mentioned.
- EBR ethylene butene rubber
- the film is resistant to wrinkles.
- the uniformity of voids can be improved, which is preferable. If the copolymerization amount and the added amount of kneading are less than 1% by weight, the effect of addition is not seen. If it exceeds 5% by weight, poor dispersion occurs, gel-like projections are formed, and the heat resistance of the receiving sheet is reduced. Low sensitivity May go down.
- the polypropylene resin preferably has an isotactic index (II) of 90 to 99.8%. If II is less than the above range, the strength of the film may be reduced, or the film may be broken and the resistance may be deteriorated. If II exceeds the above range, film formation may be unstable.
- the II of the polypropylene in the A layer is more preferably 9299.5%.
- the melt flow rate (MFR) of the above polypropylene resin is preferably within a range of 120 g / l0 min (230 ° C, 2.16 kg). And miniaturization). If the MFR is less than the above range, the extrusion amount may fluctuate during melt extrusion, a long time may be required for extruding material replacement, or voids may not be easily formed. When the MFR exceeds the above range, when co-extruding and laminating the layer A and the skin layer, it becomes difficult to laminate the layers in a uniform thickness, and the film becomes brittle, and the film is easily broken in the film forming process and the katting process. There are cases.
- the MFR of the polypropylene resin is more preferably 11 to 15 gZlO.
- the propylene resin of the white film of the first embodiment and the white film of the second to fourth embodiments of the present invention include, for example, an antioxidant and a heat stabilizing agent as long as the object of the present invention is not impaired. It is possible to mix well-known additives such as an agent, a chlorine scavenger, an antistatic agent, a lubricant, an antiblocking agent, a viscosity modifier, and a copper damage inhibitor.
- a high melt tension polypropylene (High Melt Strength_PP, hereinafter referred to as HMS) is added to the polypropylene resin.
- HMS High Melt Strength_PP
- PP makes melt extrusion stable and improves film forming properties, and enables stable sequential biaxial stretching even in high-magnification stretching. Accordingly, the porosity is improved, which is preferable.
- a method for obtaining HMS-PP for example, a method of blending a polypropylene resin containing a large amount of high molecular weight components, a method of blending an oligomer or polymer having a branched structure, and a method described in JP-A-62-121704 Long chain components in the polypropylene molecule
- the melt tension and the intrinsic viscosity, the crystallization temperature and the melting point each satisfy a specific relationship without introducing a long-chain branch, and A method of producing a linear crystalline polypropylene having a boiling xylene extraction residual ratio in a specific range is preferably used.
- polypropylene having a long-chain branch in the main chain skeleton is a polypropylene resin having a branched polypropylene chain having the same length as the main chain from the propylene main chain skeleton.
- polypropylene resin having a long-chain branch in the main chain skeleton examples include polypropylene manufactured by Base 11 (type name: PF-814, PF_633, PF_611, SD-632, etc.), polypropylene manufactured by Bo realis (Type name: WB130HMS, etc.) and Dow polypropylene (type name: D114, D201, D206, etc.).
- the amount of HMS-PP added depends on the type of HMS-PP to be used. The effect is observed even with a small amount of added kashimi, which is preferably 1 to 30% by weight. is there. If the mixing amount is less than the above range, no improvement in film forming property is observed, and if the mixing amount is more than the above range, the film forming property is deteriorated, and in particular, the longitudinal stretchability at the time of high-magnification stretching may be deteriorated, The stable extrudability of the molten polymer during melt extrusion and the smoothness of the film may deteriorate, and the amount of HMS-PP mixed is more preferably 1 to 20% by weight, and most preferably 2 to 12% by weight. .
- the stretching stress at the time of stretching in the case where the white film of the present invention is manufactured by sequential biaxial stretching, particularly at the time of longitudinal stretching
- the stretching stress at the time of stretching can be reduced so that the film can be manufactured within the stretching capacity of the existing equipment or stretched.
- at least one selected from the above-described polypropylene resin and another polymer other than the elastomer one component may be appropriately added to the white film of the present invention since void formation may be promoted due to .
- the void shape is not improved, but the stretching stress at the time of film formation is not improved, or conversely, it becomes unnecessarily high or a coarse void is formed.
- the other polymer examples include a well-known polymer resin including a polyolefin resin, a polyester resin, a polyamide resin, a polyphenylene sulfide resin, and a polyimide resin.
- the ⁇ crystal ratio of the polypropylene resin in the A layer needs to be 30% or more. If the ⁇ crystal ratio is less than the above, the void formation amount is insufficient, and it may be difficult to obtain uniform voids in the thickness direction of the film.
- the higher the ⁇ crystal ratio of the ⁇ layer of the white film of the present invention the more the above-mentioned void formation can be promoted. Therefore, a high sensitivity can be obtained when processed into a thermal transfer recording receiving sheet.
- the j3 crystal ratio of the ⁇ layer is more preferably 40 to 95%, and further preferably 4590%.
- the white films of the third and fourth embodiments of the present invention need to have ⁇ crystal activity in order to form a nucleus-free void in the A layer. Due to the ⁇ crystal activity, ⁇ crystals are generated in the unstretched sheet in the film forming step, and ⁇ crystals are transformed to arsenic in the subsequent stretching step. This makes it possible to form uniform and dense voids.
- the fact that the ⁇ layer has ⁇ -crystal activity is determined based on the following criteria in correspondence with the fact that the entire white film of the present invention has ⁇ -crystal activity. That is, using a differential scanning calorimeter (DSC), a 5 mg white film was heated to 280 ° C at a rate of 10 ° C / min in a nitrogen atmosphere according to JIS 7122 (1987), After holding for 5 minutes, cool to 30 ° C at a cooling rate of 10 ° C / min, hold for 5 minutes at the next step, and then raise the temperature again at a rate of 10 ° C / min.
- DSC differential scanning calorimeter
- the white film is defined as having ⁇ crystal activity (as a whole film).
- the white film of the first or second embodiment In order for the white film of the first or second embodiment to have a / 3 crystal ratio of 30% or more of the polypropylene resin of the white film of the first or second embodiment, or the white film of the third or fourth embodiment to have ⁇ -crystal activity, Above polyp It is preferable to add a so-called ⁇ crystal nucleating agent to the propylene resin. When such a ⁇ crystal nucleating agent is not added, the above-mentioned high; 3 crystal ratio may not be obtained.
- Examples of the ⁇ crystal nucleating agent that can be preferably added to the polypropylene resin constituting the white film of the present invention include, for example, carboxyls represented by potassium 1,2-hydroxystearate, magnesium benzoate, magnesium succinate, magnesium phthalate and the like.
- Alkali or alkaline earth metal salts of acids Alkali or alkaline earth metal salts of acids; amide compounds such as ⁇ , N'-dicyclohexyl-2,6-naphthalene dicarboxamide; sodium benzenesulfonate and sodium naphthalenesulfonate Aromatic sulfonic acid compounds; di- or tribasic carboxylic acid di- or triesters; tetraoxaspiro compounds; imidocarboxylic acid derivatives; phthalocyanine pigments represented by phthalocyanine blue; quinacridone, quinacridone quinone, and the like Kinakuri represented by Don pigments: binary compounds composed of an organic dibasic acid component ⁇ and an oxide, hydroxide or salt of a Group ⁇ metal of the periodic table, component B, etc.
- the following compounds 1 and 2 are preferably It is particularly preferable because the ⁇ crystal ratio can be increased and the formation of voids can be promoted in the subsequent stretching step.
- R in the formula is a saturated or unsaturated aliphatic dicarboxylic acid residue having 1 to 24 carbon atoms, a saturated or unsaturated alicyclic dicarboxylic acid residue having 4 to 28 carbon atoms, or 6 carbon atoms. Represents 28 aromatic dicarboxylic acid residues, R or different carbon number 3 18
- R in the formula is a saturated or unsaturated aliphatic diamine residue having 1 to 24 carbon atoms, Represents a saturated or unsaturated alicyclic diamine residue having 4 to 28 carbon atoms or a heterocyclic diamine residue having 6 to 12 carbon atoms or an aromatic diamine residue having 6 to 28 carbon atoms; same
- a binary compound comprising a component A which is an organic dibasic acid and a component B which is an oxide, hydroxide or salt of a Group III metal of the periodic table.
- ⁇ crystal nucleating agent or ⁇ crystal nucleating agent-added polypropylene include a ⁇ crystal nucleating agent “ENDUSTER” (type name: NU-100, manufactured by Shin Nihon Rika Co., Ltd.) ), Polypropylene “BEPOL” (type name: B-022-SP, etc.) added by ⁇ crystal nucleating agent manufactured by Sunoco Chemicals.
- ENDUSTER type name: NU-100, manufactured by Shin Nihon Rika Co., Ltd.
- BEPOL type name: B-022-SP, etc.
- the amount of the ⁇ crystal nucleating agent added in the present invention is 0.001 to 1% by weight based on the total amount of the resin in the layer, which depends on the / 3 crystal forming ability of the / 3 crystal nucleating agent used. Preferably, there is.
- the addition amount of the nucleating agent is less than the above range, the ⁇ -crystal ratio of the obtained white film becomes insufficient, the specific gravity becomes high, or coarse voids are formed. The sensitivity when processed may be poor.
- the addition amount of the ⁇ crystal nucleating agent is more preferably 0.5 005- 0.5 wt 0/0, more preferably 0. 05 0. 2 wt 0/0.
- the porosity of the lower layer of the white film of the first mode and the white film of the second mode of the present invention needs to be 30 to 80%. If the porosity is less than 30%, the specific gravity is high, the whiteness is low, and the cushion ratio is low, so that the sensitivity of the receiving sheet for thermal transfer recording is low. If the porosity exceeds 80%, the fold wrinkle resistance may deteriorate, and the film may be easily broken, which may cause a problem in processability. In order to make the receiving sheet for thermal transfer recording highly sensitive, it is preferable that the white film has a low specific gravity, a high whiteness, and a high cushioning ratio.
- the longitudinal direction (hereinafter may be abbreviated as MD) and the width direction (hereinafter may be abbreviated as TD) of the A layer of the white film of the first embodiment and the white film of the second embodiment of the present invention.
- MD longitudinal direction
- TD width direction
- Ah The strength (F2 value) at 2% elongation in the range of 10-70MPa is in the range of 10-70MPa.
- the F2 value of the white film of the present invention depends on the amount of the ⁇ crystal nucleating agent preferably added to the polypropylene resin, the ratio of the thickness of the core layer ( ⁇ layer) to the thickness of the skin layer ( ⁇ layer),
- the crystallization conditions metal drum temperature, peripheral speed of the metal drum, thickness of the obtained undrawn sheet, etc.
- drawing conditions drawing direction (vertical or horizontal)
- Stretching method vertical and horizontal or horizontal and vertical sequential biaxial stretching, simultaneous biaxial stretching, re-stretching after biaxial stretching, etc.
- stretching ratio stretching speed, stretching temperature, etc.
- the film is too soft, and the film may stretch and wrinkle due to the tension during winding in the film forming process.
- the F2 value exceeds 70 MPa, resistance to buckling in the winding step after film formation may be reduced.
- the white film according to the second to fourth embodiments of the present invention has a core (A layer) using the above-described substantially resin-free void-free polypropylene resin layer, and has a skin layer (B Layers) (hereinafter sometimes simply referred to as layer B).
- a layer a core
- B Layers skin layer
- the smoothness and gloss of the film surface can be improved as compared with the case where the layer B is not laminated.
- a receptor layer is formed on layer B and processed into a thermal transfer recording receptor sheet, adhesion to the thermal head is improved and heat dissipation is suppressed compared to when the layer B is not laminated.
- the transferability from the ink ribbon that is, the sensitivity is further improved.
- the B layer of the white film according to the second or third embodiment of the present invention may be composed of at least one resin made of a polyolefin resin, an acrylic resin, a polyester resin, a polyurethane resin, or the like.
- a polyolefin-based resin and more preferred is a polypropylene resin.
- propylene may be used as a second component other than propylene, for example, as ethylene or olefin. Examples thereof include those obtained by random or block copolymerization of butene, hexene, and otaten. Among them, homopolypropylene is preferred because the heat resistance of the layer B surface is increased.
- the polypropylene resin of layer B of the white film according to the second or third embodiment of the present invention is preferably a crystalline polypropylene having II of 92% or more.
- Polymethylpentene, isotactic polystyrene, and synd It is also possible to add and mix 110 to 10% by weight of tactic polystyrene, polymethyl methacrylate, polycarbonate and the like. As a result, fine voids are formed in the layer B, and the sensitivity as the receiving sheet may be improved in some cases. If the amount is less than 1% by weight, it is difficult to form voids. If the amount exceeds 10% by weight, the incompatible resin may fall off during the film forming step and the secondary processing step.
- the average dispersion diameter of the incompatible resin component is preferably in the range of 0.22 x m.
- the average dispersion diameter is less than 0.2 ⁇ , voids are formed. On the other hand, if it exceeds 2 x m, the incompatible resin may fall off or the void diameter may be increased, which may lower the surface quality.
- the incompatible resin component it is preferable to use polymethylpentene (hereinafter abbreviated as PMP) which has good dispersibility in a polypropylene resin and can form fine voids.
- PMP polymethylpentene
- the above PMP having an MFR at 260 ° C and 5 kg of 5 to 100 g / lO min, preferably 10 to 50 g / 10 min has good dispersibility in polypropylene and has uniform and fine voids. It is preferable because it can be formed.
- the following resin is preferably used as a resin other than the polypropylene resin.
- the acrylic resin include an ethylene-acrylic acid copolymer, an ethylene-acrylic acid ester copolymer, an ethylene-methacrylic acid copolymer, and an ethylene-methacrylic acid ester copolymer.
- Aromatic polyester is preferred as the polyester resin, and ionomer-type polyether 'urethane' and polyester 'urethane' are preferred as the polyurethane resin as the polyurethane resin.
- the method of laminating the layer B is not specified, but the polypropylene resin is preferably laminated with the layer A by coextrusion or extrusion lamination.
- the lamination of an acrylic resin, a polyester resin, a polyurethane resin or the like is preferably performed by a coating method.
- Layer B by the coating method is formed by applying and drying a mixed coating agent of a water-soluble and Z- or water-dispersible crosslinkable polyester urethane resin and a water-soluble organic solvent.
- the film moldability and the adhesiveness between the layer A are good and are preferable.
- the polyester urethane resin is obtained by esterifying a dicarboxylic acid and a diol component. It comprises polyester polyol and polyisocyanate, and if necessary, a chain extender.
- dicarboxylic acid component of the polyester urethane resin examples include terephthalic acid, isophthalanolic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, trimethyladipic acid, sebacic acid, malonic acid, dimethylmalonic acid, succinic acid, and glutar.
- Acid pimelic acid, 2,2-dimethyldarta monooleic acid, azelaic acid, fumaric acid, maleic acid, itaconic acid, 1,3-cyclopentanedicanolevonic acid, 1,2-cyclohexanedicarboxylic acid, 1,4- Cyclohexanedicarboxylic acid, 1,4-naphthalic acid, diphenic acid, 4,4'-oxybenzoic acid, 2,5-naphthalenedicarboxylic acid, and the like can be used.
- diol component of the polyester urethane resin examples include aliphatic glycolones such as ethylene glycol, 1,4-butanediol, diethylene glycol, and triethylene glycol; and aromatic diols such as 1,4-cyclohexanedimethanol. And poly (oxynorylene) glycols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol.
- the polyester urethane resin may be copolymerized with an oxycarboxylic acid such as p-oxybenzoic acid or acrylic acid (and derivatives thereof) in addition to the dicarboxylic acid component and the diol component.
- an oxycarboxylic acid such as p-oxybenzoic acid or acrylic acid (and derivatives thereof) in addition to the dicarboxylic acid component and the diol component.
- Examples of the polyisocyanate include hexamethylene diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, and lysine diisocyanate. And adducts of tolylene diisocyanate and trimethylolpropane, and adducts of hexamethylene diisocyanate and trimethylolethane.
- Examples of the chain extender include diols containing a pendant carboxy group, for example, ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, hexamethylene glycol, neopentyl glycol, and the like. Glycols, or ethylenediamine, propylenediamine, hexamethylenediamine, phenylenediamine, tolylenediamine, diphenyldiamine, diaminodiphenylmethane, diaminodiphenylmethal And diamines such as diaminocyclohexylmethane.
- diols containing a pendant carboxy group for example, ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, hexamethylene glycol, neopentyl glycol, and the like.
- polyester urethane-based resin examples include "Hydran” (type name: AP-40F, etc.) manufactured by Dainippon Ink and Chemicals, Inc.
- N-methinolepyrrolidone ethyl ethyl cellosolve acetate
- at least one or more of dimethylformamide is added.
- N-methylpyrrolidone is preferable because it has a large effect of improving the film formability and the adhesive strength to the A layer.
- the amount of addition is preferably 11 to 15 parts by weight per 100 parts by weight of the polyester urethane resin, more preferably 310 parts by weight from the viewpoint of the flammability of the coating agent and prevention of odor deterioration.
- a crosslinked structure to enhance the adhesiveness between the layer B and the layer A.
- a method for obtaining such a coating liquid include methods described in JP-A-63-15816, JP-A-63-256651, and JP-A-5-152159.
- the crosslinking component addition of at least one crosslinking agent selected from an isocyanate compound, an epoxy compound, and an amine compound may be mentioned.
- Examples of the above-mentioned isocyanate-based compounds include the above-mentioned toluene diisocyanate,
- Isophorone diisocyanate and the like, but are not limited thereto.
- Examples of the epoxy compound include diglycidyl ether of bisphenol A and its oligomer, diglycidyl ether of hydrogenated bisphenol A and its oligomer, diglycidyl ether of orthophthalic acid, diglycidyl ether of isophthalic acid, and the like. Examples thereof include, but are not limited to, terephthalic acid diglycidyl ether and adipic acid diglycidyl ether.
- amine compound examples include amine compounds such as melamine, urea, and benzoguanamine; amino resins obtained by addition condensation of the above amino compounds with formaldehyde and alcohols having 16 to 16 carbon atoms; hexamethylene diamine. Examples thereof include, but are not limited to, min and triethanolamine.
- the amine compound used as a cross-linking agent include "Becamine” (type name: APM, etc.) manufactured by Dainippon Ink and Chemicals, Inc.
- the amount of the crosslinking agent selected from the above-mentioned isocyanate-based compounds, epoxy-based compounds, and amine-based compounds is 1 part per 100 parts by weight of the mixed coating agent of the water-dispersible polyester urethane-based resin and the water-soluble organic solvent.
- One 15 parts by weight is more preferably 310 parts by weight, which is preferable from the viewpoint of improving chemical resistance and preventing deterioration of water resistance. If the amount of the cross-linking agent is less than the above range, the effect of improving the adhesiveness may not be obtained.If the amount exceeds the above range, it is estimated that the cross-linking agent remaining unreacted remains. The adhesion of the layer may be reduced.
- a small amount of a crosslinking accelerator may be added to the coating agent for forming the layer B in order to accelerate the crosslinking and curing of the composition of the layer B.
- a crosslinking accelerator to be added to the water-dispersible polyester urethane-based resin of the layer B a water-soluble acidic compound is preferable since it has a large effect of promoting crosslinking.
- the crosslinking accelerator include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, trimethyladipic acid, sebacic acid, malonic acid, dimethylmalonic acid, conodic acid, glutaric acid, and sulfonic acid.
- Pimelic acid 2,2-dimethyldaltaric acid, azelaic acid, fumaric acid, maleic acid, itaconic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexane Hexanedicarboxylic acid, 1,4-naphthalic acid, diphenic acid, 4,4'-monobenzoic acid, 2,5-naphthalenedicarboxylic acid and the like can be used.
- cross-linking accelerator examples include "Catalysed” (type: PTS, etc.) manufactured by Dainippon Ink and Chemicals, Inc.
- a method of coating the coating agent for forming the layer B a method of applying the coating agent using a reverse roll coater, a gravure coater, a rod coater, an air doctor coater, or any other known coating device is preferable.
- a reverse roll coater a gravure coater, a rod coater, an air doctor coater, or any other known coating device is preferable.
- the B layer of the white film of the 23rd embodiment of the present invention contains a small amount of at least one of inorganic particles and organic particles in order to impart lubricity.
- the addition amount of the additive is preferably 0.01-1% by weight, more preferably 0.1-1% by weight. It is 0.5% by weight. If the addition amount exceeds 1% by weight, the resin and particles may fall off during the film forming step, the manufacturing step of the thermal transfer recording receiving sheet and the like, which is not preferable. If the added amount of calories is less than 0.01% by weight, the effect of imparting lubricity is not recognized.
- the inorganic particles include wet and dry silica, colloidal silica, aluminum silicate, titanium oxide, calcium carbonate, calcium phosphate, barium sulfate, alumina, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, zinc oxide, and zinc oxide.
- Antimony, cerium oxide, zirconium oxide, tin oxide, lanthanum oxide, magnesium oxide, barium carbonate, zinc carbonate, basic lead carbonate (white lead), barium sulfate, calcium sulfate, lead sulfate, zinc sulfide, Titanium mica, tanolek, clay, kaolin, lithium fluoride, calcium fluoride and the like can be used.
- the organic particles are particles obtained by crosslinking a polymer compound using a crosslinking agent.
- a crosslinking agent for example, crosslinked particles of a polymethoxysilane compound, crosslinked particles of a polystyrene compound, crosslinked particles of an acryl compound, crosslinked particles of a polyurethane compound, crosslinked particles of a polyester compound, crosslinked particles of a fluorine compound, or a mixture thereof. Mixtures can be mentioned.
- the average particle diameter of the inorganic particles and the crosslinked organic particles is in the range of 0.5 to 2 ⁇ m, and it is preferable that the particles are spherical because the particles are less likely to aggregate and have a high lubricity effect. If the average particle size is less than 0.5 / im, the lubricating effect is low, and if the average particle size is more than 2 ⁇ , the film surface is not easily damaged when the particles fall off or the films are rubbed with each other.
- the sum of the strength (F2 value) at 2% elongation in the longitudinal direction (MD) and the width direction (TD) needs to be in the range of 30 to 100MPa. It is.
- the F2 value of the entire film is increased.
- the F2 value is the addition amount of the 33 nucleating agent preferably added to the polypropylene resin ⁇
- a layer B having a half-crystallization time (t) of 60 seconds or less is laminated on at least one surface of the layer A.
- t is a value obtained by using a DSC and cooling the sample from a molten state to a specific temperature (125 ° C
- the t of the layer B of the white film of the fourth embodiment of the present invention is set to 60 seconds or less, and preferably not extended.
- the layer B is on the metal drum surface side during the preparation of the stretched sheet, the following advantages can be obtained.
- the t of the layer is preferably 50 seconds or less, more preferably 40 seconds or less. Also, B
- the t of the layer B is most preferably “0 seconds” defined below from the viewpoint of productivity.
- the stretchability deteriorates during the film forming process, and the adhesion to the receptor layer (or anchor layer) deteriorates when a receptor layer is placed on layer B and processed into a thermal transfer recording receptor sheet.
- the porosity of the layer B is greater than 0%, the t force need not be SO seconds.
- t is, for example, the type and amount of nucleating agent, HMS-PP, as exemplified below.
- the B layer of the white film according to the fourth embodiment of the present invention is made of a polypropylene resin.
- the fact that the layer B is made of polypropylene means that all the resins constituting the layer B are polypropylene resins.As long as the effects of the present invention are achieved, the layer B is exemplified, for example, as follows. Resins, additives, particles, etc. other than polypropylene may be included. However, the above-mentioned t is the total of the materials constituting the B layer (hereinafter simply referred to as the resin of the B layer).
- the polypropylene resin constituting the layer B is mainly composed of a homopolymer of propylene, and is a copolymer of propylene and another unsaturated hydrocarbon monomer component within a range not to impair the object of the present invention. It may be a polymer, or a polymer in which propylene and a monomer component other than propylene are copolymerized may be blended, or a monomer component of an unsaturated hydrocarbon monomer other than propylene may be blended. (Co) polymers may be blended.
- the polypropylene resin constituting the B layer in particular Homoporipu propylene and ethylene.
- Propylene random copolymer A polymer ethylene 5 wt 0/0 by following copolymerization.
- a method such as adding a crystal nucleating agent or ⁇ crystal nucleating agent to a propylene resin, or adding the above HMS-PP to a polypropylene resin is preferably used.
- examples of the ⁇ crystal nucleating agent include a sorbitol-based nucleating agent, an organic phosphate metal salt-based nucleating agent, an organic carboxylic acid metal salt-based nucleating agent, and a rosin-based nucleating agent.
- rosin-based nucleating agents are particularly preferred because they have a high effect of improving quality and productivity by accelerating crystallization.
- Specific examples of such a particularly preferable rosin-based nucleating agent include "Paintari Stanole” (type name: KM_1300, KM_1500, KM-1600, etc.) manufactured by Arakawa Chemical Co., Ltd.
- the same nucleating agents as those described in the thirteenth embodiment of the present invention can be used.
- voids penetrating through the front and back of the film may be formed in the obtained white film. Be careful with your choice. When through holes are formed, smooth The sensitivity when processing the receptor sheet by installing a receptor layer on layer B, or applying a solution in which the receptor layer (anchor layer) has been adjusted in advance, because of the deterioration of the glossiness and the surface gloss In some cases, the applied solution penetrates into the inside of the film, and the receiving layer (anchor layer) cannot be formed properly.
- the amount of the crystal nucleating agent to be added depends on the performance of the crystal nucleating agent used, but is preferably 0.0011% by weight based on the total amount of the resin in the B layer. If the amount of the crystal nucleating agent is less than the above range, the effect of decreasing t may not be obtained. Calorie of nucleating agent
- the slipperiness is deteriorated, and the glossiness is out of the range of the present invention described below, or the dispersibility of the nucleating agent itself is deteriorated and surface defects may occur.
- the addition amount of the nucleating agent is more preferably 0.01 to 0.8% by weight.
- a crystal nucleating agent may reduce the ⁇ crystal forming action of the ⁇ crystal nucleating agent, so if a film containing a crystal nucleating agent in layer ⁇ is reused as layer ⁇ raw material, In order to achieve the ⁇ crystal ratio, it is necessary to control the amount of the ⁇ crystal nucleating agent to be mixed.
- HMS-PP for the lower layer of the white film of the fourth mode of the present invention. It is particularly preferable to use polypropylene having a long-chain branch in the main chain skeleton, because the effect of stabilizing the melt extrusion and improving the above-mentioned quality and productivity by promoting crystallization are great.
- the addition amount of the above-mentioned HMS-II is preferably 11 to 20% by weight based on the total amount of the resin in the layers S and B depending on the performance of the HMS-II used. If the amount of HMS-PP is less than the above range, the effect of reducing t may not be obtained.
- HMS-PP is less than the above range, the effect of reducing t may not be obtained.
- the addition amount of HMS-PP is more preferably 1 to 15% by weight.
- the crystallization temperature (Tc) of the layer B of the white film according to the fourth embodiment of the present invention is preferably 115 ° C or more.
- Tc is a value measured for the entire resin of layer B, like t.
- Tc of the layer B is less than the above range, when the molten polymer is solidified on a metal drum held at a high temperature exceeding 100 ° C in the casting process, the sheet is not removed particularly when the peripheral speed of the drum is high. If solidification is not completed before peeling and the unstretched sheet sticks to the drum There is a match.
- Tc is more preferably at least 119 ° C.
- the higher the Tc of the layer B the higher the temperature.The higher the temperature of the drum, the lower the speed of the drum.
- the receptor layer (for example, the temperature is preferably 150 ° C. or lower because the adhesiveness to the anchor layer may be deteriorated.
- the Tc of the B layer is the crystallinity of the polypropylene constituting the B layer (such as II), the amount of the crystal nucleating agent and HMS-PP exemplified above, the incompatible resin, the inorganic particles, and the organic particles exemplified below. It can be controlled by the amount of added calories.
- the Tc of the layer B is more preferably 120 145 ° C, and most preferably 123-130. C.
- the polypropylene constituting the layer B of the white film according to the fourth embodiment of the present invention preferably has an isotactic index (II) of 9599.8%.
- II isotactic index
- the II of the polypropylene resin constituting the layer B is more preferably 97-99.5%.
- the B layer of the white film of the fourth mode of the present invention preferably has a porosity of 0.1 to 5%.
- the porosity of the layer B is obtained by calculating the ratio of voids to the skin layer when the cross section of the film adjusted under specific conditions is observed by SEM under specific conditions as described below.
- the porosity of the layer B is less than the above range, when a receiving layer is provided on the layer B and used as a receiving sheet for thermal transfer recording, sensitivity at low energy is reduced, and this causes high-speed printing. May be inferior in nature.
- the porosity of the B layer is more preferably 0.2 to 2%, further preferably 0.2 to 2%.
- the unstretched It is important to set the surface temperature of the metal drum during sheet production to a high temperature of, for example, 100 to 130 ° C.
- incompatible resins and inorganic particles exemplified below
- organic particles may be added to the polypropylene constituting the layer B. In this case, adding them may be effective not only for promoting the formation of voids but also for improving the slipperiness by forming fine irregularities on the film surface.
- the incompatible resin that can be preferably added to the B layer is not particularly limited.
- Examples of the polypropylene resin that can be added to the B layer of the white film disclosed in the second and third embodiments of the present invention include: Incompatible resins can be used as well.
- the incompatible resin used for the layer B of the white film of the fourth embodiment of the present invention includes, from the viewpoints of handleability, production cost (raw material price), dispersibility in polypropylene, void formation, and the like, It is particularly preferable to use known polymethylpentene, polycarbonate, and saturated polyester.
- the above-mentioned polymethylpentene can be used in a known manner. Its melt flow rate (MFR; measured under the conditions of 260 ° C and 5 kg) is preferably 5 lOOg / 10 minutes. Les ,. If the MFR is less than the above range or exceeds the above range, coarsely dispersed polymethylpentene components are formed in the polypropylene, and coarse voids may be formed in the B layer, and the B layer is cleaved. May be easier.
- the MFR of the polymethylpentene is more preferably 8 to 80 g / 10 minutes, and still more preferably 10 to 60 g / 10 minutes.
- the MFR of the above polycarbonate (measured under the conditions of 300 ° C and 1.2 kg) is preferably 10 1 lOOg / 10 minutes. If the MFR is less than the above range or exceeds the above range, a coarsely dispersed polycarbonate component is formed in the polypropylene, and coarse voids may be formed in the B layer, and the B layer is easily cleaved. There is.
- the MFR is more preferably 20-80 g / 10 minutes.
- the glass transition temperature (Tg) of the polycarbonate is preferably 100 to 180 ° C. If the Tg is less than the above range, the polycarbonate may be crushed when forming a void in the layer B in the process of biaxial stretching, and the void may not be formed. If the Tg exceeds the above range, the polycarbonate is coarsely dispersed in the polypropylene, and coarse voids may be formed in the B layer, and the B layer may be easily cleaved. Tg is more preferred Is 120-170 ° C. Similarly, when another amorphous resin is used as the incompatible resin, the Tg preferably satisfies the above range.
- the amount of the incompatible resin to be added to the layer B of the white film according to the fourth embodiment of the present invention is preferably 11 to 10% by weight based on the total amount of the resin in the layer B. If the amount of the incompatible resin is less than the above range, a substantial amount of voids may not be formed in the B layer. If the added amount of the immiscible resin exceeds the above range, an unnecessary amount of voids are formed in the B layer, and the B layer may be easily cleaved.
- the amount of the immiscible resin is preferably 18 to 18% by weight, and more preferably 2 to 5% by weight.
- the average dispersion diameter of the above-mentioned incompatible resin is preferably 0.2-2 am. If the average dispersion diameter is less than the above range, a substantial amount of voids may not be formed. If the average dispersion diameter exceeds the above range, the incompatible resin may be dropped off or coarse voids may be formed in the manufacturing process of the white film and the thermal transfer recording receiving sheet, and the B layer may be easily cleaved. .
- the average dispersion diameter of the incompatible resin is more preferably from 0.3 to 1.5 ⁇ m.
- the inorganic particles that can be preferably added to the layer B of the white film according to the fourth embodiment of the present invention are not particularly limited. Examples thereof include wet and dry silica, colloidal silica, aluminum silicate, and titanium oxide. , Calcium carbonate, calcium phosphate, barium sulfate, alumina, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide (zinc white), antimony oxide, cerium oxide, dinoreconium oxide, tin oxide, lanthanum oxide, magnesium oxide, barium carbonate, carbonate At least one selected from zinc, basic lead carbonate (lead white), barium sulfate, calcium sulfate, lead sulfate, zinc sulfide, myritsu, titanium mica, talc, clay, kaolin, lithium fluoride, calcium fluoride, etc. Particles. .
- the organic particles are particles obtained by crosslinking a polymer compound using a crosslinking agent.
- the organic particles that can be preferably added to the layer B are not particularly limited.
- crosslinked particles of a polymethoxysilane compound, crosslinked particles of a polystyrene compound, crosslinked particles of an acrylic compound, crosslinked particles of a polyurethane compound, At least one kind of particles selected from crosslinked particles of a polyester-based compound, crosslinked particles of a fluoride-based compound, and the like are included.
- the amount of addition of the inorganic particles and the organic particles is 0.0 with respect to the total amount of the entire resin of the B layer. It is preferably 3-5% by weight. If the addition amount is less than the above range, a substantial amount of voids may not be formed in the B layer, or the slip property may not be significantly improved as compared with the case where no addition is made. If the amount exceeds the above range, particles may fall off in the process of producing the white film and the thermal transfer recording receiving sheet, and the process may be contaminated.
- the addition amount of the inorganic particles and the organic particles is more preferably 0.053% by weight.
- these inorganic particles and organic particles may be added for the purpose of improving the slipperiness of the film. Les ,.
- the addition amount is preferably 0.021% by weight, from the viewpoints of preventing force blocking and improving slipperiness. More preferably, it is 0.05-0.5% by weight.
- the inorganic particles and the organic particles are preferably spherical because they hardly fall off in the process of producing the white film and the thermal transfer recording receiving sheet.
- the average particle diameter of the inorganic particles and the organic particles added to the layer B of the white film according to the fourth embodiment of the present invention is preferably 0.5-5 ⁇ . If the average particle size is less than the above range, a substantial amount of voids may not be formed in the B layer, or the slip property may not be significantly improved as compared with the case where no addition is made. If the average particle size exceeds the above range, in the process of producing a receiving film for white film and thermal transfer recording, particles may fall off and contaminate the process, or the surface of the film may be easily damaged when a white film is rubbed on top of another. is there. The average particle size of the inorganic particles and the organic particles is more preferably 0.8-3 ⁇ .
- the particles tend to fall off and contaminate the process. It is preferable that the addition amount is appropriately selected because it is preferable that the addition amount is not substantially added.
- the thickness of the layer B of the white film according to the twenty-fourth embodiment of the present invention is in the range of 0.1, and the white layer is laminated on both sides of the layer A. This is preferable because it has good runnability in the process and can prevent cleavage. If the thickness of the layer B is less than the above range, it may be difficult to laminate the layer with a uniform thickness, or the wrinkle resistance may be deteriorated. If the thickness of the layer B exceeds the above range, the sensitivity may be reduced when a receiving layer is provided on the layer B and processed into a receiving sheet for thermal transfer recording.
- the thickness of layer B is Preferably it is 0.5-4 / im, more preferably 114-4 / im.
- the surface gloss of the layer B of the white film of the first embodiment and the white films of the second and third embodiments of the present invention needs to be 10 to 145%.
- the surface glossiness is less than 10%, images and characters are blurred when used as a thermal transfer recording receiving sheet, and when the surface glossiness exceeds 145%, the images and characters are undesirably reflected and become difficult to see.
- the white glossiness of the layer B of the white film according to the fourth embodiment of the present invention is 30 to 145%.
- the surface glossiness of the B layer is a value measured on the B layer surface of the white film.
- the object of the present invention is achieved if the surface luminance of one of the layers B satisfies the above range.
- the surface gloss is determined by the crystallinity (II, mmmm, etc.) of the polypropylene resin constituting the target B layer, the raw material composition, the crystallization conditions for solidifying the molten polymer in the casting process, and the stretching conditions in the stretching process. Can be controlled by Of these, especially when a nucleating agent is added to the layer B, as described above, voids (so-called through holes) penetrating through the film front and back are formed in the obtained white film, and the surface gloss decreases. Therefore, care must be taken in the selection.
- the surface glossiness of the layer B is more preferably 70-130%, further preferably 85-128%.
- the average surface roughness (Ra) of the B layer of the white film of the first embodiment and the white films of the second and third embodiments of the present invention may be in the range of 0.02 ⁇ 1 / im. I like it.
- the average surface roughness (Ra) of the B layer of the white film of the fourth mode becomes smoother by increasing the speed of t.
- Ra is less than the above range, the slipperiness of the white film is deteriorated, and the white film or the receiving sheet may be wrinkled in the production process of the film or the receiving sheet for thermal transfer recording. If Ra exceeds 1 zm, the surface light intensity will be unnecessarily low, or it will pass through the metal edge during the winding process when manufacturing a white film and the heating process when manufacturing a thermal transfer recording receiving sheet. When doing so, the white film or receiving sheet may be damaged.
- Polypropylene or polypropylene
- the crystallinity (such as II or mmmm) of the molten resin, the crystallization conditions for solidifying the molten polymer in the casting process metal drum temperature, peripheral speed of the metal drum, thickness of the undrawn sheet to be obtained, etc.
- Stretching conditions in the stretching process (stretching direction (vertical or horizontal), stretching method (vertical, horizontal or horizontal, vertical and sequential biaxial stretching, simultaneous biaxial stretching, re-stretching after biaxial stretching, etc.), stretching ratio, stretching speed , Stretching temperature, etc.).
- Ra is more preferably 0.05 to 0.50 ⁇ , and still more preferably 0.15 to 0.45 zm.
- a layer other than the above-described layer B (hereinafter, may be simply referred to as a layer C) may be laminated as a skin layer.
- the film configuration is B layer ZA layer ZC layer (Z indicates the lamination interface).
- the receiving layer (anchor layer) may be provided on the B layer or on the C layer.
- the layer B side surface was brought into close contact with the metal drum during the production of the unstretched sheet to form a high-speed film, and in the manufacturing process of the thermal transfer recording receiving sheet, the layer C was laminated on the opposite side of the layer B. It is particularly preferable to provide a receiving layer on the substrate. As a result, a white film can be formed at a high speed, and at the same time, by appropriately selecting the C layer, the adhesion of the receptor layer can be improved.
- the resin constituting the layer C is preferably a polyolefin-based resin, and a polypropylene resin, which is preferable from the viewpoint of adhesiveness between the layer C and an adjacent layer, may be a resin such as heat resistance of a film. From the point of view, more preferred.
- the polypropylene resin used for the layer C is preferably composed mainly of a homopolymer of propylene.
- the monomer components of polypropylene and other unsaturated hydrocarbons are preferably used. It may be a copolymerized polymer, a blended polymer of propylene and a monomer component other than propylene, or a monomer component of an unsaturated hydrocarbon other than propylene. (Co) polymers may be blended.
- the monomer component constituting such a copolymer component or the blend is not particularly limited.
- ethylene for example, ethylene, propylene (in the case of a copolymerized blend), 1-butene, 1-pentene, 3-Methylpentene 1-1, 3-Methylbutene 1, 1, 1-Hexene, 4-Methylpentene-1, 1, 5-Ethylhexene-1, 1, Otatene, 1-Decene, 1-Dodecene, Bulcyclo Examples include hexene, styrene, arylbenzene, cyclopentene, norbornene, 5-methyl-2-norbornene, acrylic acid and derivatives thereof.
- anchor layer When a receiving layer (anchor layer) is provided on the C layer, of these, low stereoregularity polypropylene or ethylene propylene random copolymer is used. It is particularly preferable in order to achieve both the adhesion between the layer and the receiving layer (anchor layer).
- the stereoregularity (mmmm) of the low stereoregularity polypropylene is preferably 70 to 90% from the viewpoint of adhesion to the receptor layer (anchor layer).
- the mmmm is less than the above range, when a receiving layer is formed on the layer B and used as a receiving sheet for thermal transfer recording, heat resistance against heat from a thermal head is poor, and sensitivity is lowered depending on transfer energy. There are cases. If mmmm exceeds the above range, the adhesive strength with the receiving layer (anchor layer) may not be substantially improved. mmmm is more preferably 72 85%. In addition, since the adhesive force with the receiving layer (anchor layer) may be further improved, ethylene may be copolymerized with the low stereoregularity polypropylene.
- the ethylene copolymerization amount of the ethylene propylene random copolymer in the layer C is preferably 115% by weight. If the ethylene copolymerization amount is less than the above range, the adhesive strength with the receptor layer (anchor layer) may not be substantially improved. If the ethylene copolymerization amount exceeds the above range, when a receptor layer is formed on the layer B and used as a receptor sheet for thermal transfer recording, heat resistance to heat from a thermal head is inferior. May be lower.
- the ethylene copolymerization amount is more preferably 1 to 3% by weight.
- the thickness of the C layer is preferably 0.1-5 ⁇ . If the thickness of the C layer is less than the above range, it may be difficult to laminate the C layer with a uniform thickness. If the thickness of the C layer exceeds the above range, the sensitivity may decrease when a receiving layer is provided on the C layer and processed into a thermal transfer recording receiving sheet.
- the thickness of the C layer is preferably 0.5 to 4 zm, more preferably 11.
- Examples of the method for laminating the C layer include coextrusion, in-line 'off-line extrusion lamination, in-line' off-line coating, physical vapor deposition, chemical vapor deposition, sputtering, and the like, but are not limited to any of these. Then choose the best method at any time Les ,. In the case of simply laminating in a B layer / A layer / C layer configuration, it is preferable to use coextrusion because lamination can be performed at low cost.
- the A layer, B layer, and C layer of the white film according to the fourth embodiment of the present invention include known additives other than those described above, for example, an antioxidant, a heat stabilizer, an antistatic agent, a slip agent, An anti-blocking agent, a filler and the like may be contained to such an extent that the object of the present invention is not impaired.
- the specific gravity of the white film of the thirteenth embodiment of the present invention is preferably 0.2 to 0.8.
- the specific gravity of the white film according to the fourth embodiment of the present invention is 0.3 to 0.7.
- the specific gravity of the white film of the present invention depends on the amount of the ⁇ crystal nucleating agent preferably added to the propylene resin, the ratio of the thickness of the ⁇ layer to the ⁇ layer, and the thickness of the C layer. It can be controlled by the crystallization conditions at the time of stretching, the stretching conditions in the stretching step, the heat treatment conditions, and the like.
- the area ratio, particularly the longitudinal stretching ratio, is increased.
- the specific gravity of the white film of the present invention is low, the sensitivity when processed into a thermal transfer recording receiving sheet tends to be high, which is preferable.However, when the specific gravity is too low, in the production process of the white film ⁇ thermal transfer recording demand sheet, The film may be stretched, shredded, or broken (if the above-mentioned phenomenon is observed, the film is inferior in workability), and the wrinkle resistance may be deteriorated.
- the depth of the white finolem of the present invention is more preferably from 0.33 to 0.69, further preferably from 0.35 to 0.65, and most preferably from 0.35 to 0.62.
- the thermal conductivity of the white film of the thirteenth embodiment of the present invention is 0.14 W / mK or less, preferably 0.12 W / mK or less. Preferred, to increase the sensitivity of the sheet. If the thermal conductivity exceeds 0.14 WZmK, the heat of the thermal head of the printer will be dissipated, and the transferability from the printer ribbon will be reduced, and the sensitivity (color developability) of the thermal transfer recording receiving sheet will be reduced. Not preferred.
- the lower limit of the thermal conductivity is determined by the thickness configuration of the A layer and the B layer of the biaxially oriented white polypropylene film of the present invention, and the gap. Rate and total thickness force are preferably 0.03 W / mK.
- the white film of the 14th mode of the present invention has a whiteness of 50% or more, an L value of 50 or more, an a-value force of S-2-5, and a b-value force of S-4. 0.01 is preferable for increasing the sensitivity of the receiving sheet for thermal transfer recording.
- the L, a, and b scales are designed by Richard S. Hunter and used in colorimeters. Colorimeters are suitable for color quality control and are widely used in the United States and Japan.
- the color position of a sample in a color solid can be determined by the L, a, and b values.
- the larger the L value the higher the brightness, that is, the brighter.
- the larger the value a is on the (+) side and the larger the degree of red is on the (-) side, the greater the degree of green is.
- the greater the b value is on the (+) side and the greater the degree of yellow is on the (1) side, the greater the degree of blue is.
- the whiteness of the white film according to the fourteenth aspect of the present invention is preferably in the range of 50-100%. When the whiteness is less than the above range, when the image is printed on the receiving sheet for thermal transfer recording, the image may be darkened as a whole. The whiteness is more preferably 60-100%.
- the L value of the white film of the present invention is preferably 50 or more. If the L value is less than the above range, the image may be unclear when processed into a thermal transfer recording receiving sheet.
- the L value is more preferably 60100.
- the a value of the white film of the fourteenth aspect of the present invention is preferably _2-5. If the a value is higher on the + side than the above range, the image may appear reddish as a whole when the image is printed on the thermal transfer recording receiving sheet. If the a value is lower than the above range to one side, the image may look greener.
- the a value is more preferably 0.023, and still more preferably Or 0.02—1.
- the b value of the white film of the fourteenth embodiment of the present invention is preferably _5-0.01. If the b value is higher than the above range on the + side, when the image is printed on the thermal transfer recording receiving sheet, the entire image looks yellowish, especially when the low color such as skin color looks yellow. There is. When the b value is lower than the above range, the image looks bluish.
- the b value is more preferably from 4.5 to 1.1 2.7.
- the optical density ( ⁇ D) of the white film according to the fourteenth aspect of the present invention is preferably 0.41. If the OD is less than the above range, the impression of the image may be poor when the image is printed on the receiving sheet for thermal transfer recording.
- ⁇ D varies depending on the thickness of the film, and in the present invention, the whiteness of the film and the L, a, and b values may be in the preferred range when the film thickness is 35 zm and within the above range.
- the OD of the white film of the present invention is more preferably 0.65-0.82.
- the whiteness, L, a, b value and OD of the white film of the 14th embodiment of the present invention are determined by the addition amount of the ⁇ crystal nucleating agent preferably added to the propylene resin and the ⁇ layer and the skin layer ( The thickness ratio of the B layer and the C layer) and the production process thereof can be controlled by the crystallization conditions for solidifying the molten polymer in the casting process and the stretching conditions in the stretching process.
- the cushion ratio of the white film according to the fourteenth aspect of the present invention is preferably 15 to 30%. If the cushion ratio is less than the above range, the thermal transfer recording sheet is difficult to adhere to the thermal head, and the heat from the thermal head is dissipated, and the transferability from the transfer sheet (ink ribbon) is deteriorated (the sensitivity is lowered). To). When the cushion ratio exceeds the above range, the folding sheet resistance of the receiving sheet for thermal transfer recording may be deteriorated.
- the welding rate is determined by the amount of ⁇ crystal nucleating agent added preferably to the polypropylene of layer A, the ratio between the thickness of layer ⁇ and the thickness of skin layers (layers B and C), and the ratio of layers A, B and C.
- the crystallinity of the polypropylene (or polypropylene resin) used, and the production process thereof, can be controlled by the crystallization conditions for solidifying the molten polymer in the casting process and the stretching conditions in the stretching process.
- the cushion rate is more preferably 16-25%.
- the thickness of the white film of the 14th embodiment of the present invention is preferably 10 100 xm, from the viewpoint of the productivity of the white film, the sensitivity of the thermal transfer recording receiving sheet, and the fold wrinkle resistance. Power preferred.
- the thickness of the white film of the present invention is more preferably 20-60 ⁇ ⁇ .
- the corona discharge treatment on at least one surface of the white film according to the fourteenth aspect of the present invention so that the film surface has a wetting tension of 35 mN / m or more can be achieved by combining the treated surface with the receiving layer (anchor layer). It can be preferably employed to increase the adhesive strength between the treated surface and the other materials exemplified below.
- the atmosphere gas at the time of the corona discharge treatment at least one kind of gas selected from air, oxygen, nitrogen, carbon dioxide gas and the like can be mentioned. Of these, it is preferable to use air from the viewpoint of economy, and it is preferable to use a mixed system of nitrogen and carbon dioxide gas from the viewpoint of improving the adhesiveness, which is preferable.
- the surface wetting tension is more preferably 37 mN / m or more.
- the upper limit of the surface wetting tension is not particularly provided, but since excessive surface treatment may deteriorate the surface and adversely affect the above-mentioned adhesiveness, the upper limit is preferably 60 mN / m or less.
- An anchor layer may be provided on at least one side of the white film according to the fourteenth embodiment of the present invention in order to increase the adhesive force between the white film and the receiving layer.
- the structure of the receiving sheet at this time is white film / anchor layer / receiving layer.
- the anchor layer is composed of a core layer (in the case of a single-layer of only A layer; B layer) and a skin layer (B layer, C layer) of the white film of the first embodiment or the white film of the second to fourth embodiments.
- B layer skin layer
- the adhesive force can be controlled by appropriately selecting the resin composition.
- the resin constituting the anchor layer is not particularly limited as long as it can substantially increase the adhesive force between the white film and the receiving layer, and examples thereof include an acrylic resin, a polyester resin, It is preferably at least one resin selected from polyurethane resins and the like. These resins are preferably prepared as a coating agent dissolved or dispersed in an organic solvent or water from the viewpoint of adhesion to the white film. preferable.
- the acrylic resin is not particularly limited.
- the acrylic resin is not particularly limited.
- the polyester-based resin is not particularly limited, but is preferably, for example, an aromatic polyester.
- the polyurethane resin is not particularly limited.
- trimethyl adipate, sebacic acid, malonic acid, dimethyl malonic acid, cono acid obtained from ionomer type polyether urethane, polyester urethane, or the like can be used.
- Acid glutaric acid, pimelic acid, 2,2-dimethyldaltaric acid, azelaic acid, fumaric acid, maleic acid, itaconic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexenedicarboxylic acid, 1,4-naphthalic acid, diphenic acid, 4,4'-hydroxybenzoic acid, 2,5-naphthalenedicarboxylic acid, and the like can be used.
- the diol component of the polyester urethane resin includes aliphatic glycols such as ethylene glycol, 1,4-butanediol, diethylene glycol and triethylene glycol, and aromatic glycols such as 1,4-cyclohexane dimethanol.
- Poly (oxyalkylene) glycols such as diol, polyethylene glycol, polypropylene glycol, and polytetramethylene glycol are exemplified.
- the polyester urethane resin may be copolymerized with an oxycarboxylic acid such as p-hydroxybenzoic acid or acrylic acid (and derivatives thereof) in addition to the dicarboxylic acid component and the diol component.
- an oxycarboxylic acid such as p-hydroxybenzoic acid or acrylic acid (and derivatives thereof) in addition to the dicarboxylic acid component and the diol component.
- polyisocyanate examples include hexamethylene diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, and lysine.
- examples include diisocyanate, an adduct of tolylene diisocyanate and trimethylolpropane, and an adduct of hexamethylene diisocyanate and trimethylolethane.
- Examples of the chain extender include diols containing a pendant carboxyl group and glycols such as ethylene glycolone, diethylene glycolone, propylene glycolone, 1,4-butanediole, hexamethylene glycol, and neopentyl glycol. Or ethylenediamine, propylenediamine, hexamethylenediamine, phenylenediamine, tolylenediamine, diphenyldiamine, diaminodiphenylmethane, diaminodiphenylmethane And diamines such as diaminocyclohexylmethane.
- glycols such as ethylene glycolone, diethylene glycolone, propylene glycolone, 1,4-butanediole, hexamethylene glycol, and neopentyl glycol.
- polyester urethane-based resin examples include "Hydran” (type name: AP-40F, etc.) manufactured by Dainippon Ink and Chemicals, Inc.
- N-methinolepyrrolidone ethyl ethyl cellulose
- organic solvents selected from dimethylformamide and the like.
- N-methylpyrrolidone is preferred because it has a large effect on improving the film formability and adhesive strength.
- the amount of the organic solvent added is 11 to 100 parts by weight of the polyester urethane resin.
- the amount is preferably 15 parts by weight, more preferably 310 parts by weight, from the viewpoint of preventing ignition of the coating agent and suppressing odor.
- a crosslinked structure into the water-dispersible polyester urethane-based resin to increase the adhesive strength between the anchor layer and the white film.
- Techniques for adjusting such a coating agent include JP-A-63-15816, JP-A-63-256651, and JP-A-5_1.
- cross-linking agent examples include at least one cross-linking agent selected from an isocyanate-based compound, an epoxy-based compound, and an amine-based compound, and are appropriately added to a coating agent.
- the above-mentioned isocyanate-based compound is not particularly limited, and examples thereof include the above-mentioned tosamethylene diisocyanate and isophorone diisocyanate.
- the epoxy compound is not particularly limited, and examples thereof include diglycidyl ether of bisphenol A and oligomers thereof, diglycidyl ether of hydrogenated bisphenol A and oligomers thereof, diglycidyl orthophthalate, and diglycidinol isophthalate. Athenoate, diglycidinoleate terephthalanolate, diglycidinoleate adipate and the like.
- the amine compound is not particularly limited.
- amine compounds such as melamine, urea, and benzoguanamine; Amino resins obtained by addition condensation of an alcohol having a force of Si-6, hexamethylene diamine, and triethanolamine.
- an amine compound to the anchor layer (coating agent).
- the amine compound used as the cross-linking agent include “Becamine” (type name: APM, etc.) manufactured by Dainippon Ink and Chemicals, Inc.
- the amount of the cross-linking agent to be added is 11 to 15 parts by weight with respect to 100 parts by weight of the mixed coating agent of the water-soluble polyester urethane resin and the water-soluble organic solvent. The amount is more preferably 3 to 10 parts by weight because it can suppress deterioration of water resistance.
- the amount of the crosslinking agent is less than the above range, the effect of improving the adhesiveness may not be obtained. If the amount exceeds the above range, the anchor layer and the white film are presumed to be due to the unreacted and remaining crosslinking agent. The adhesive strength between the two may decrease.
- the anchor layer contains: A small amount of a crosslinking accelerator may be added.
- the crosslinking accelerator to be added to the anchor layer is preferably a water-soluble acidic compound because of its high effect of promoting crosslinking.
- the crosslinking accelerator include terephthalic acid, isophthalanolic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, trimethyladipic acid, sebacic acid, malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, sulfonic acid, pimerine Acid, 2,2-dimethyldaltaric acid, azelaic acid, fumaric acid, maleic acid, itaconic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid Examples include acids, 1,4-naphthalic acid, diphenic acid, 4,4, monobenzoic acid, and 2,5-naphthalenedicarboxylic acid.
- crosslinking accelerators include "Catalyst” (type name: PTS, etc.) manufactured by Dainippon Ink and Chemicals, Inc.
- the glossiness of the surface of the receiving layer of the thermal transfer recording receiving sheet after coating the receiving layer on the white film of the present invention is 50% or more, when the image is printed on the receiving sheet. This is preferable because the image becomes clear.
- the glossiness of the surface of the receiving layer is more preferably 70% or more. Since the higher the glossiness of the surface of the receiving layer is, the higher the above-mentioned effect is, it is preferable that the upper limit is not particularly set.
- the receiving sheet for thermal transfer recording using the white film of the fourteenth embodiment of the present invention is a receiving sheet using a white film alone or a receiving sheet bonded to another material. It may be.
- the other materials include, but are not particularly limited to, plain paper, high-quality paper, medium paper, coated paper, art paper, cast-coated paper, resin-impregnated paper, emulsion-impregnated paper, latex-impregnated paper, and synthetic resin.
- papers such as attached paper, dalacin paper, and laminated paper, synthetic papers, nonwoven fabrics, and other types of films.
- the white film of the present invention When the white film of the present invention is bonded to another material, it can be bonded to the surface of the film opposite to the surface on which the receiving layer is provided, since the curl of the thermal transfer recording receiving sheet is small. preferable.
- the glossiness of the surface of the receiving layer after coating the receiving layer on the white film of the fourteenth embodiment of the present invention is 50% or more, which makes clear the transferred prints and images.
- Preferred is 70% or more.
- the biaxial stretching method in the vertical and horizontal direction or the horizontal and vertical direction the simultaneous biaxial stretching method, and the re-stretching after the biaxial stretching, etc.
- a longitudinal-horizontal sequential biaxial stretching method which is excellent in productivity and expandability of the apparatus.
- a polypropylene resin having a ⁇ crystal ratio of 30% or more is supplied to an extruder heated to 180 to 280 ° C to be melted, filtered by a filter, and extruded by a single-layer die to obtain a molten sheet.
- HMS-PP or mLLDPE may be added to and mixed with the above polypropylene.
- This molten sheet is extruded onto a drum maintained at a surface temperature of 90-130 ° C. Closely contact and blow 10 to 130 ° C air from the non-drum surface to cool and solidify to produce an unstretched sheet.
- the higher the drum temperature the higher the porosity of the film after biaxial stretching, and the surface gloss changes depending on the temperature of the blowing air, and the lower the temperature, the better the gloss.
- the unstretched sheet was guided to a group of rolls or an oven heated to 70-160 ° C, and the film temperature was raised to 80- 1 Pass between cooling rolls maintained at 50 ° C, stretch 37 times in the longitudinal direction (longitudinal direction, ie, the direction of film movement) by the peripheral speed difference between the stretching rolls and the cooling rolls. Cooling. Subsequently, the film stretched in the longitudinal direction is guided to a tenter while holding both ends of the film with clips, and is directed in a direction perpendicular to the longitudinal direction in an atmosphere heated to 120 190 ° C (film temperature: 100 ° C to 165 ° C).
- Stretching (transverse direction) 5 to 12 times is preferable because the void diameter in the film becomes uniform.
- the area magnification (longitudinal stretching ratio ⁇ horizontal stretching ratio) is preferably 15 times to 84 times, and 30 times to 60 times in view of film forming stability. If the area magnification is less than 15 times, the surface glossiness of the obtained film is low, and the formation of bubbles is insufficient, so that the characteristics of the film of the present invention cannot be obtained. Sometimes it is easy to tear.
- the film was successively placed in a tenter at 140 to 170 ° C for 130 seconds.
- the white film of the present invention can be obtained by performing the heat treatment described above, then gradually and uniformly cooling, cooling to room temperature, and winding. During the heat treatment step, a 3-12% relaxation treatment may be performed in the horizontal or vertical direction as necessary.
- the biaxial stretching may be either sequential biaxial stretching or simultaneous biaxial stretching, or may be re-stretched in either the vertical or horizontal direction after the biaxial stretching.
- a polypropylene resin is supplied to the extruder (a) as a raw material for the above-mentioned layer A, melted, and then mixed in the composite die. To be introduced.
- the above-mentioned polyolefin resin or polypropylene resin a homopropylene, a polypropylene resin obtained by copolymerizing ethylene or olefin of 5% by weight or less, or a half-crystallization time (t) is used.
- the mixture is supplied to a heated extruder (b), melt-kneaded at 180 to 280 ° C., filtered with a filter, introduced into a composite die, and laminated on one surface or both surfaces.
- a separate extruder (c) is prepared, and the resin to be the C layer is melt-kneaded at 180 to 280 ° C and filtered with a filter. Then, it may be laminated on the surface opposite to the resin layer forming the layer B in the composite die.
- the composite sheet obtained by laminating the molten polymer is extruded from a die and solidified while being in close contact with a drum maintained at a surface temperature of 90 to 130 ° C (this step is referred to as a cast process by those skilled in the art).
- the layers constituting the composite sheet corresponding to the layers A, B, and C of the white film are hereinafter referred to as an Ac layer, a Be layer, and a Cc layer, respectively.
- the thickness composition and film thickness of the Ac layer, Be layer and Cc layer can be controlled by the amount of molten polymer extruded from each extruder.
- surface D may be simply referred to as surface D.
- the sheet does not stick to the drum and the amount of ⁇ crystals generated in the unstretched sheet can be kept high even when the drum speed is increased or the drum peripheral speed is increased. Further, no crater-like defects occur on the surface of the bilayer after biaxial stretching.
- the contact time with the metal drum is preferably 3 to 60 seconds.
- the contact time with the metal drum exceeds the above range, depending on the size of the metal drum, the peripheral speed of the metal drum may be too low, and productivity may be significantly deteriorated.
- the contact time with the metal drum is more preferably 545 seconds, and even more preferably 7 to 20 seconds.
- the method of contacting the cooling drum is any of the electrostatic application (pinning) method, the contact method using surface tension of water, the air knife method, the press roll method, and the underwater casting method.
- air is blown to a surface of the sheet that does not contact the metal drum (hereinafter, may be simply referred to as an ND surface).
- the air temperature is preferably in the range of 10 to 130 ° C, and the surface gloss can be controlled by the air temperature, and the lower the temperature, the higher the gloss.
- the film temperature is set to 80-150 ° C, and the roll pair (stretching roll) of a hard chrome plated metal roll and rubber roll whose surface temperature is kept at 80-140 ° C Then, it passes between a pair of hard chrome plated metal rolls and rubber rolls (cooling rolls) whose surface temperature is maintained at 30-100 ° C, and the longitudinal speed (film The film is stretched 3-7 times in the moving direction) and cooled with rolls of 30 ° C-100 ° C.
- the film temperature and the stretching ratio in the machine direction are important in controlling the specific gravity of the film after biaxial stretching. That is, the lower the film temperature, the lower the specific gravity, and the higher the stretching ratio, the lower the specific gravity. Further, the motor that drives the roll has a capacity. By keeping the stretching stress low, stretching can be performed even with a motor having a small capacity, so that no capital investment is required. As described above, in the white film of the present invention, since the adhesion and defects are suppressed even during high-speed casting and the ⁇ crystal ratio of the unstretched sheet can be kept high, the film temperature is increased or the longitudinal stretching ratio is decreased. However, since the desired specific gravity after biaxial stretching can be achieved, the stretching stress can be kept low.
- the film stretched in the longitudinal direction was guided to a tenter while holding both ends of the film with clips, and was vertically suspended in an atmosphere heated to 120-190 ° C (film temperature: 100 ° C 165 ° C). Stretch 5 12 times in the straight direction (lateral direction).
- the area ratio (longitudinal stretching ratio ⁇ lateral stretching ratio) of the longitudinal and transverse biaxial stretching is preferably 15 to 84 times and 30 to 60 times from the viewpoint of film forming stability. If the area magnification is less than the above range, the surface gloss of the white film after biaxial stretching may be low, or the amount of voids formed may be insufficient, and the characteristics of the film of the present invention may not be obtained. If the area magnification exceeds the above range, tearing may occur frequently during stretching.
- the heat treatment was continued in a tenter at 140 170 ° C for 110 seconds. After that, the film is uniformly cooled, cooled to room temperature and rolled up, whereby the white film of the present invention can be obtained. During the heat treatment step, if necessary, a relaxation treatment of 312% may be performed in the horizontal or vertical direction.
- the surface of the thus obtained white film of the present invention is applied to the surface of the white film of the present invention in the above-described atmosphere gas in order to increase the interlayer adhesion when the receiving layer is applied or bonded to another substrate. Perform corona discharge treatment as appropriate and wind up.
- an anchor layer during the production process of the white film. That is, an acrylic resin, a polyester resin, a polyurethane resin, or the like is applied on the longitudinally stretched film, and subsequently introduced into a tenter to be horizontally stretched and dried.Since the in-line coating method can install the anchor layer at low cost, It is preferably used. In the in-line coating method, it is preferable to perform a corona discharge treatment before applying the anchor layer to the surface of the longitudinally stretched film on which the anchor layer is to be applied. This is preferable because the adhesive strength between the white film and the anchor layer can be increased. . Of course, the anchor layer can be installed using an off-line coating method.
- the characteristic values of the present invention are determined by the following evaluation methods and evaluation criteria.
- the A layer is observed by the above method, and when the ratio of the number of voids having a nucleus inside to the total number of voids is 5% or less, the A layer is substantially free of nuclei. It was judged to have voids, and was rated as ⁇ . In addition, the case where it exceeds 5% is designated as X.
- having a nucleus refers to a spherical, fibrous, irregular, or other shape-incompatible resin, inorganic particles, or organic particles capable of forming voids in polypropylene. Means that there is one or more in a single void having one boundary line.
- the time from the start time to the peak of the exothermic peak was measured as a half-crystallization time (t) based on a calorific curve with time on the horizontal axis (unit: second). Note that the calorific value curve with the horizontal axis as time
- the peak of the exothermic peak appears before the above-mentioned start time, that is, when the crystallization rate that cannot be measured by this method is extremely high, it is expressed as 0 seconds ().
- the shape of the sample can be any shape as long as it is the entire resin of layer B, but it is chip-shaped because it is easy to handle. That's good ,.
- a sample may be prepared by shaving a required amount of the layer B from the skin layer (layer B) of the white film with a cutter knife or the like. The same measurement was performed five times for the same sample, and the average value of the obtained t was taken as t of the sample.
- the specific gravity of the white film was determined by using a high-precision electronic hydrometer SD-120L (made by Mirage Trading Co., Ltd.). It was measured at 23 ° C and 65% RH according to the method A (underwater displacement method) of 7112 (1999). The same measurement was performed five times for the same sample, and the average of the obtained specific gravities was defined as the specific gravity of the sample.
- the measurement was performed based on JIS K 7122 (1987) using a thermal analyzer RDC220 manufactured by Seiko Instruments. 5 mg of a white film (sample) was sealed in an aluminum pan, loaded, and set in the apparatus. In a nitrogen atmosphere, the temperature was increased from 30 ° C to 280 ° C at a rate of 10 ° C / min (hereinafter, the calorific curve obtained at this time may be abbreviated as the first-run calorie curve). After the completion of the temperature rise, it was kept at 280 ° C for 5 minutes. Subsequently, it was cooled to 30 ° C at a rate of 10 ° C / min. After the cooling was completed, it was kept at 30 ° C. for 5 minutes.
- the calorific curve obtained at this time may be abbreviated as a second calorific value curve in some cases.
- the calorific curve of the second run obtained at this time if an endothermic peak accompanying melting of the crystal is observed at 140 ° C or higher and lower than 160 ° C, the film (raw material polypropylene) is determined to have crystal activity.
- the endothermic peak means a substance having a heat of fusion of 10 mj / mg or more.
- the heat of fusion is the area enclosed by the baseline and the calorific curve until the caloric curve shifts from the baseline to the endothermic side as the temperature rises and then returns to the baseline position. Then, a straight line was drawn on the high temperature side up to the intersection of the calorific curves, and this area was determined by computer processing. If the calorific value curve shifts to the heat absorption side and does not completely return to the baseline position but shifts to the heat absorption side again, drop the perpendicular to the baseline from the maximum point at which the heat absorption side begins to shift again, The area enclosed by the line and the vertical line.
- a melting peak exists at 140 to 160 ° C according to the above method, if it is unclear whether the peak is due to melting of the ⁇ crystal, it is determined that a melting peak exists at 140 to 160 ° C.
- the presence of a ⁇ -crystal diffraction peak in a diffraction profile obtained by a wide-angle X-ray diffraction method may be used to determine that the compound has ⁇ -crystal activity.
- a calorific value curve was collected for the entire resin of the third layer and determined.
- the shape of the sample can be any shape as long as the entire layer of resin is used. However, it is easy to handle, so it is preferable to use a chip shape. Also, the required amount of ⁇ layer may be cut off from the skin layer ( ⁇ layer) of the white film with a cutter knife or the like to prepare a sample.
- the orientation of the film is determined from an X-ray diffraction photograph in which the following three-directional X-rays are incident on the film.
- Edge incidence Incident perpendicular to the surface formed in the vertical and thickness directions of the film.
- Imaging plate FUJIFILM BAS-SR
- Devie's syler rings with virtually uniform intensity are obtained in X-ray diffraction photographs in any direction
- the film only has to satisfy the above-described criteria for biaxial orientation.
- the measurement was performed based on JIS K 7122 (1987) using a thermal analyzer RDC220 manufactured by Seiko Instruments.
- Tm melting temperature
- the apex temperature of the exothermic peak accompanying crystallization from the molten state was defined as the crystallization temperature (Tc) (unit: ° C).
- the sample is preferably in the form of a chip as long as it is the entire resin of the A layer and the B layer.
- the following (7) is used to obtain Tc and Tm of each layer. Based on the image obtained when determining the porosity of the skin layer (B layer) in), cut the required amount of the skin layer (B layer) with a cutter knife etc. based on the thickness of each layer determined in (19) below. May be prepared. The same measurement was performed five times for the same sample, and the average value of the obtained Tc and Tm was defined as Tc and Tm of the sample.
- the cross section of the skin layer (B layer) of the white film was observed in the same manner as in (1), and 10 cross-sectional images were collected at different observation points.
- a ⁇ HP sheet (an OHP sheet for EPSON manufactured by Seiko Epson Corporation) was placed on the obtained cross-sectional image. Next, only the voids (voids) of the skin layer (layer B) were painted black on the OHP sheet with a magic pen. The obtained image of the ⁇ HP sheet was read under the following conditions.
- the obtained images were subjected to image analysis using Image-Pro Plus, Ver. 4.0 for Windows, manufactured by Planetron Corporation. At this time, spatial calibration was performed using the scale of the acquired cross-sectional image.
- the measurement conditions were set as follows.
- the ratio of the area of the void (solid black portion) to the total area of the skin layers of the ten cross-sectional images that is, the area of the rectangular target area (Rectangular AOI) to be measured. was calculated as a percentage and defined as the porosity of the skin layer (unit:%).
- the apparent specific gravity (dl) of the film determined by the method (3) is measured. Separately, this film is heated and melted by a hot press at 280 ° C and compressed to create a sheet with completely voids removed, and then immersed in water at 30 ° C and quenched. The apparent specific gravity (d2) is measured in the same manner.
- the porosity of the film was determined by the following equation.
- the porosity of the second core layer (A layer) was calculated from the value obtained in the same manner as the porosity of the entire white film of the first embodiment based on the thickness of each layer obtained in (19) below. The value was obtained by subtracting the porosity of the skin layer in (7).
- Stylus running direction lateral direction of film 'Measurement mode: stylus type (STYLUS)
- the surface glossiness of the surface of layer B of the white film was measured (unit:%). The same measurement was performed five times for the same sample, and the average value of the obtained surface gloss was defined as the surface gloss of the sample.
- the isotactic index (II) is determined from the boiling n-heptane extraction residue. Extract the sample with boiling n-heptane for a certain period of time, and calculate the isotactic index by calculating the weight (%) of the unextracted portion.
- the thimble was dried at 110 ⁇ 5 ° C for 2 hours. C, leave in a room of 65% RH for 2 hours or more, put 10 g of sample (polypropylene in powder or flake form) into cylindrical filter paper, and accurately weigh using a direct balance with a weighing cup and tweezers. (Up to 4 decimal places).
- polypropylene and thermoplastic elastomers measure according to JIS K 7210 (1995), condition M (230 ° C, 2.16 kg).
- Ethylene resin is measured in accordance with JIS K 7210 (1995), condition D (190 ° C, 2.16 kg).
- Polycarbonate is measured according to the conditions of JIS K7210 (1995) (300 kg, 1.2 kg).
- Polymethylpentene is measured according to ASTM D 1238 (260.C, 5.0 kg).
- the polypropylene resin and polypropylene film are measured using a scanning differential calorimeter (DSC) in accordance with JIS K-7122. Specifically, a 5 mg sample was heated to 250 ° C at a rate of 10 ° C / min in a nitrogen atmosphere, then held for 5 minutes, and then cooled to 20 ° C at a cooling rate of 10 ° C / min. I do.
- DSC scanning differential calorimeter
- the core layer (A) is cut in the center of the film by inserting a single blade in the center of the film thickness, applying adhesive tape on both sides of the film, and pulling it off simultaneously. A central portion of the cut film is scraped off with a single blade to form a sample.
- the measurement was performed based on JIS K 7122 (1987) using a thermal analyzer RDC220 manufactured by Seiko Instruments.
- a 5 mg sample was sealed in an aluminum pan, loaded, and set in the device. Under a nitrogen atmosphere, the temperature was raised from 30 ° C to 280 ° C at a rate of 20 ° CZ. After the completion of the temperature rise, it was kept at 280 ° C for 5 minutes. Subsequently, it was cooled to 30 ° C at a rate of 20 ° C / min. After the cooling was completed, it was kept at 30 ° C. for 5 minutes. Next, the temperature was raised again to 280 ° C at a rate of 20 ° CZ.
- the starting point of the glass transition was defined as the glass transition temperature (Tg) (temperature: ° C).
- Tg glass transition temperature
- SSC5200 thermal analysis system manufactured by Seiko Instruments
- TRC Toray Research Center
- the volume average particle diameter measured by a centrifugal sedimentation method using CAPA500 manufactured by Horiba, Ltd. was defined as the average particle diameter (unit: / m).
- the thickness of the skin layer (such as the B layer) was measured at 10 points while changing the observation position, and the average value thereof was defined as the thickness of the skin layer (such as the B layer) (unit: xm).
- the observation magnification can be set arbitrarily as long as the observation magnification is as high as possible, that is, the magnification can be measured with high accuracy.
- the thickness of the core layer was calculated by subtracting the thickness of the skin layer from the thickness of the entire white film for which the following (23) force was also determined.
- the polypropylene was extracted with n-heptane at a temperature below 60 ° C for 2 hours to remove impurities' additives in the polypropylene. Then, vacuum dried at 130 ° C for 2 hours or more to obtain a sample. The sample was dissolved in a solvent, and the meso pentad fraction (mmmm) was determined using 13 C-NMR under the following conditions (unit:%).
- Dial gauge type thickness gauge JIS B 7503 (1997), PEACOCK UPRIGHT DIAL GAUGE (0.001 X 2mm), No. 25, measuring element 5mm ⁇ flat type), dial gauge stand (No. 7001DGS-M) Install. Film thickness obtained from this (d0) Is measured. Further, the thickness (d 500) when a load of 500 gf was applied to the dial gauge pressing portion was measured, and the cushion ratio was calculated by the following formula (unit:%).
- Adhesive high-quality paper (label sheet for KOKUYO Co., Ltd. word processor, tie — 2110—W) with a thickness of 65 ⁇ m is evenly attached to the surface of the white film (opposite to the surface on which the receptor layer is formed), and the wrinkles are evaluated.
- the sample was cut into a length of 200 mm and a width of 15 mm, one end was fixed, and a 200 g weight was connected to both sides by wires. The other end was pulled at 200 mm / sec while being turned 180 °. The occurrence of wrinkles on the film surface was observed at a magnification of 10 using a stereoscopic microscope, and judged based on the following criteria.
- Probe Standard probe (0.023—12W / mK)
- ⁇ ⁇ ⁇ 1 ⁇ ( ⁇ 2 / ⁇ 1) / 4 ⁇ ( ⁇ 2— Tl)
- the molten polymer is extruded from a die, solidified on a metal drum, and cooled and solidified into a sheet.On an unstretched sheet, squares of lcm square are placed so that each side is parallel to the longitudinal and width directions of the film. Engraved. Thereafter, the film is stretched and wound up continuously, and the length (cm) of the squares of the obtained film is measured for ten squares in the vertical direction and ten squares in the width direction. The effective stretching ratio in the transverse direction was used.
- the place where the unstretched sheet was peeled off from the metal drum was observed, and the judgment was made based on the following criteria.
- the surface of the white film after the biaxial stretching was visually observed, and judged based on the following criteria.
- Films that can be industrially put to practical use are those that are judged as ⁇ .
- the white film of the present invention was laminated on paper having a thickness of 150 zm. Then, using a micro gravure coater so that the coating amount is 3 g / m 2 by dry, the following coating agent for forming a receiving layer on the film surface is coated, the receiving sheet for thermal transfer recording It was made.
- Polyester resin (Toyobo Co., Ltd., Byron 200): 20 parts
- Silicone oil (Shin-Etsu Chemical Co., Ltd., X-22-3000T): 2 parts
- Methyl ethyl ketone 39 parts.
- B l—Two times, the density is slightly low, or there is a sheet where slight chipping is observed, but otherwise the image with high density is clear and good.
- C 3-5 times, the density is low, or "chips” or “crushing” are observed, and there are sheets where the image looks reddish or yellowish overall.
- D Density is low 6 times or more, "chips” or “crushing” are observed, and there is a sheet in which the image looks reddish or yellowish overall.
- a cellophane tape (manufactured by Nichiban Co., 18 mm width) is parallel to the surface on the receiving layer side and the surface on the opposite side of the obtained thermal transfer recording receiving sheet, respectively.
- the pieces were bonded to each other at a length of 15 cm so that they face each other. Thereafter, the surface on the receiving layer side was held down with the hand opposite to the dominant hand, and the cellophane tape on the receiving layer side was rapidly peeled off with a dominant hand in an angle of about 45 °. At this time, the ratio of the receiving layer (including other layers of the receiving sheet) transferred to the cellophane tape was observed and evaluated according to the following criteria.
- A The receiving layer did not migrate to the cellophane tape at all.
- ⁇ Less than 20% of the receiving layer migrates to cellophane tape.
- ⁇ 20. More than / o and less than 50% of the receiving layer migrates to cellophane tape.
- X 50% or more of the receiving layer migrated to cellophane tape.
- Films that can be industrially put into practical use are those that are judged to be ⁇ and ⁇ .
- the present invention will be described with reference to the following Examples, but the present invention is not limited thereto.
- the amount of polymer extruded from each extruder was adjusted to a predetermined value.
- the measurement was performed on the f (D side) side.
- H- PP Known homopolypropylene resin
- MFR 4g / 10 min, 11: 98.5%
- 99.9 weight 0/0 as crystal nucleating agent
- Add 0.1% by weight of N, N, -dicyclohexyl-2,6_naphthalenedicarboxamide (NU-100 manufactured by Nippon Rika Co., Ltd.) mix and supply to a twin screw extruder at 280 ° C
- the mixture was extruded into a gut shape, passed through a water bath at 20 ° C., cooled, cut into 3 mm lengths with a chip cutter, and dried at 100 ° C. for 2 hours.
- the ⁇ crystal ratio of the ⁇ crystal nucleating agent-added PP (hereinafter abbreviated as crystal PP) is 82%.
- the ⁇ -crystal PP is supplied to an extruder heated to 200 ° C, melted, extruded into a sheet through a single-layer die, and heated to a surface temperature of 90 ° C.
- a non-stretched film was produced by tightly contacting a non-drum surface with cold air blown at 30 ° C. The contact time with the metal drum at this time was 35 seconds.
- the unstretched film was guided to an oven heated and maintained at 120 ° C, and after preheating, it was moved in the longitudinal direction (vertical direction, ie, the direction of film movement; hereinafter simply referred to as the MD direction).
- the film was stretched twice and cooled with a roll at 100 ° C.
- the film stretched in the MD direction is guided to a tenter while gripping both ends of the film with a clip, and is placed in a direction perpendicular to the MD direction (transverse direction, hereinafter abbreviated as TD direction) in an atmosphere heated to 135 ° C.
- 150 mm is set in a tenter to complete the crystal orientation of the biaxially oriented white polypropylene film and to impart flatness and dimensional stability.
- a 5% relaxation heat treatment in the lateral direction was performed at ° C, and the mixture was uniformly cooled slowly and then cooled to room temperature.
- both surfaces were subjected to a corona discharge treatment in air in order to apply a receptor layer or to be bonded to another substrate, and the surface was wound to a wet tension of 37 mN / m.
- the thickness of the film obtained as described above was 35 ⁇ m, and SEM observation of the cross section of the film confirmed that the film contained many fine and nonnucleated voids.
- the book After laminating a paper of 150 / im thickness on the D side of the white film of the invention, apply the above-mentioned coating liquid for forming a receiving layer on the surface (ND side) opposite to the D side with high gloss of the film. Coating was performed with a gravure coater so that the coating amount was 3 g / m 2 when dried to obtain a receiving sheet for thermal transfer recording.
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force
- Tables 2 and 3 show the finolem characteristics and the characteristics of the receiving sheet for thermal transfer recording. Since the characteristics of the white film are within the range of the present invention, it is understood that the film is excellent as a receiving sheet for thermal transfer recording.
- H—PP manufactured by Sumitomo Chemical Co., Ltd., WF836DG3, MFR: 7 g / lO content, II: 96%) 94.8% by weight, and a linear low-density polyethylene obtained with a meta-mouth catalyst (Mitsubishi Chemical "Riki-Nenore" KS560, MFR: 17g / l07- (190 ° C), hereinafter abbreviated as m_LLDPE) 5% by weight and 0.2% by weight of NU-100 as a ⁇ crystal nucleating agent Mix, supply to a twin screw extruder, melt and mix at 280 ° C, extrude in a gut shape, pass through a 20 ° C water bath, cool, cut into 3mm lengths with a tip cutter, then 100 ° C For 2 hours.
- m_LLDPE 5% by weight
- NU-100 NU-100 as a ⁇ crystal nucleating agent Mix
- the ⁇ crystal ratio of the ⁇ crystal was 88%.
- the crystal was supplied to an extruder heated to 200 ° C, melted, extruded into a sheet through a single-layer die, and brought into close contact with a cast drum heated to a surface temperature of 120 ° C. Then, cold air of 30 ° C was blown from the non-drum surface side to cool and solidify, thereby producing an unstretched film. The contact time with the metal drum at this time was 35 seconds.
- the unstretched film was guided to an oven heated and held at 90 ° C, and after preheating, stretched 4 times in the longitudinal direction (longitudinal direction, that is, advancing direction of the film; hereinafter, abbreviated as MD direction), and then stretched to 40 ° C. Cooled with C roll.
- the film stretched in the MD direction was guided to a tenter while gripping both ends of the film with a clip, and was placed in a direction perpendicular to the MD direction (transverse direction, hereinafter abbreviated as TD direction) in an atmosphere heated to 125 ° C. )
- TD direction transpendicular to the MD direction
- area magnification: longitudinal stretching magnification X transverse stretching magnification 36 times
- a tenter is used.
- the film was subjected to a 5% relaxation heat treatment in the transverse direction at 150 ° C, and then uniformly cooled, and then cooled to room temperature.
- the surface of the white film of the present invention is coated with a receiving layer.
- both surfaces were subjected to corona discharge treatment in air in order to bond them to another substrate, and the surface was wound up to a wet tension of 37 mN / m.
- the thickness of the film obtained as described above was 25 ⁇ m, and it was confirmed that the film contained many fine and nonnucleated voids.
- the above coating solution for forming a receptor layer is applied to the ND side of the film having a high glossiness by a microgravure coater. Coating was performed so that the amount of work became 3 gZm 2 when dried to obtain a receiving sheet for thermal transfer recording.
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by pressing
- Tables 2 and 3 show the finolem characteristics and the characteristics of the receiving sheet for thermal transfer recording.
- Example 1 except that ⁇ -crystal PP was a mixture of 50% by weight of H-PP and 50% by weight of polypropylene added with ⁇ -crystal nucleating agent (“BEPOL” manufactured by Sunoco Chemicals, type: B_022_SP, hereinafter abbreviated as PP) in 50% by weight of ⁇ -PP.
- BEPOL ⁇ -crystal nucleating agent manufactured by Sunoco Chemicals, type: B_022_SP, hereinafter abbreviated as PP
- PP ⁇ -crystal nucleating agent
- the resin composition is shown in Table 1, and the film properties and the properties of the receiving sheet for thermal transfer recording are shown in Tables 2 and 3.
- the film has high porosity, high whiteness, high optical density, and high cushioning ratio, but is flexible and excellent in wrinkle resistance. Further, since the characteristics of the present white film fall within the range of the present invention, it can be seen that the sensitivity of the receiving sheet for thermal transfer recording is high.
- Example 4 instead of the m-LLDPE of Example 2, a hydrogenated styrene-butylene copolymer “Dynalon” 1320P manufactured by CFSR (hereinafter abbreviated as H-SBR) was added and mixed.
- H-SBR hydrogenated styrene-butylene copolymer
- the addition amount of the / 3 nucleating agent NU-100 was 0.02% by weight, and Biaxially oriented white polypropylene film in the same manner as in Example 2 except that m-LLDPE was added and mixed with ethylene propylene rubber ("Tuffmer" PO 480 manufactured by Mitsui Chemicals, Inc .; hereinafter, abbreviated as EPR) instead of m-LLDPE.
- EPR ethylene propylene rubber
- Table 1 shows the resin composition
- Tables 2 and 3 show the film properties and the properties of the receiving sheet for thermal transfer recording.
- the film has high porosity, high whiteness, high optical density, and high cushioning ratio, but is flexible and excellent in wrinkle resistance. Further, since the characteristics of the present white film fall within the range of the present invention, it can be seen that the sensitivity of the receiving sheet for thermal transfer recording is high.
- the resin composition of the ⁇ crystal of Example 2 was used as a layer, supplied to an extruder (a) heated to 200 ° C., melted, and introduced into a composite die.
- an ethylene propylene random copolymer having an ethylene content of 4% by weight (manufactured by Sumitomo Chemical Co., Ltd., FM40 1G, MFR: 7 g / 10 min), (hereinafter abbreviated as EPC) 0.3% by weight of silica with an average particle size of 1.9 ⁇ is added and mixed, supplied to a twin screw extruder, extruded at 260 ° C into a gut shape, cooled through a 20 ° C water bath, and cooled. After cutting into 3 mm length with a tip cutter, it was dried at 100 ° C for 2 hours.
- the mixed resin was supplied to an extruder (b) heated to 240 ° C, melted in the same manner, introduced into a composite die, and extruded onto both surface layers of the polymer of the extruder (a).
- a biaxially oriented white polypropylene finolem was obtained in the same manner as in Example 2, except that the polymer of (b) was laminated and co-extruded into a sheet.
- the white film of the present invention was bonded to the D side of a white film on a 150-zm-thick paper, and the above coating liquid for forming a receptor layer was applied to the ND side of the film having a high glossiness by a microgravure coater. coating weight. the coating is 3GZm 2 in dry Te to obtain a receiving sheet for thermal transfer recording
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force.
- Tables 2 and 3 show the system characteristics and the characteristics of the receiving sheet for thermal transfer recording. By laminating the skin layer, the surface glossiness and fold wrinkle resistance were further improved.
- the characteristics of the present white film fall within the range of the present invention, it can be seen that the sensitivity is high as a receiving sheet for thermal transfer recording.
- Example 1 after the corona discharge treatment was performed on the D-side surface of the longitudinally stretched film, a polyester urethane-based water-dispersible resin "Noidlan” AP-40F (Dainippon Ink Chemical Industry Co., Ltd.) was used as the B layer. ), Solid content concentration 30%, hereafter abbreviated as PEU) 100 parts by weight and 15 parts by weight of N-methylpyrrolidone as a water-soluble organic solvent are mixed with a coating agent, and a melamine conjugate “becamine” is used as a crosslinking agent.
- PEU Solid content concentration 30%
- Example 1 5 parts by weight of APM (Dainippon Ink Chemical Industry Co., Ltd.) was added, and 2 parts by weight of water-soluble acidic compound "Kyatarids' PTS (Dainippon Ink Chemical Industry Co., Ltd.) was added as a crosslinking accelerator. Then, a coating agent obtained by adding 0.2 parts by weight of spherical silica particles having an average particle size of 0.1 lxm was coated with a coating bar at 6 ⁇ m, and then stretched 10 times in the width direction in the same manner as in Example 1.
- a receiving sheet for thermal transfer recording was obtained in the same manner as in Example 2.
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force
- Tables 2 and 3 show the film properties and the properties of the receiving sheet for thermal transfer recording.
- the surface roughness was measured on the layer ⁇ .Lamination of the layer further improved the surface glossiness and fold wrinkle resistance, and made the surface smoother, and the sensitivity was high as a receiving sheet for thermal transfer recording.
- Example 2 On one surface of the biaxially oriented white polypropylene film obtained in Example 2, the mixed coating agent of Example 7 was applied as a ⁇ layer using an off-line gravure coater, and dried with hot air at 110 ° C. to obtain a layer B thickness.
- a receiving sheet for thermal transfer recording was obtained in the same manner as in Example 2, except that the film was formed and wound up at 1 ⁇ m.
- Table 1 shows the force and the resin composition of the biaxially oriented white polypropylene film thus obtained.
- Tables 2 and 3 show the film properties and the properties of the receiving sheet for thermal transfer recording. By laminating layer B, surface gloss and fold wrinkle resistance are further improved. Up. Further, since the characteristics of the present white film are within the range of the present invention, it is understood that the white film has high sensitivity as a receiving sheet for thermal transfer recording.
- H-PP WF836DG347. 5% by weight and highly crystalline polypropylene F300SV (manufactured by Idemitsu Petrochemical Co., Ltd., MFR: 3 g / 10 min, II: 98%) 47.5% by weight of a mixture) and a polymethylpentene resin having a melting temperature of 240 ° C (manufactured by Mitsui Chemicals, Inc., "TPX" MX-004, MFR: 26 g / l O, hereinafter abbreviated as PMP) 5% by weight, fed to an extruder (b) heated to 290 ° C, melted and introduced into a composite die, and the extruder (b) was applied to both surface layers of the polymer of the extruder (a).
- PMP polymethylpentene resin having a melting temperature of 240 ° C
- the film stretched in the MD direction was guided to a tenter while gripping both ends of the film with clips, and the film was heated in an atmosphere heated to 150 ° C in a direction perpendicular to the MD direction (transverse direction, hereinafter abbreviated as TD direction).
- TD direction transverse direction
- a tenter is used to complete the crystal orientation of the biaxially oriented white polypropylene film and to impart flatness and dimensional stability.
- a relaxation heat treatment of 8% in the horizontal direction was performed at 160 ° C, and then uniformly cooled, and then cooled to room temperature.
- both surfaces were subjected to a corona discharge treatment in air so as to be adhered to the coating of the receiving layer or another substrate, and the surface was wetted with a wet tension of 37 mNZm.
- a receiving sheet for thermal transfer recording was obtained.
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force
- Tables 2 and 3 show the film properties and the properties of the receiving sheet for thermal transfer recording.
- the film of the present invention has high gloss and whiteness L, a, b Is within the range of the present invention, which indicates that the sheet is excellent as a receiving sheet for thermal transfer recording.
- a quinacridone nucleating agent (Rubicron 40 ORG, Toyo Soda Co., Ltd., hereinafter referred to as 400RG) was used instead of NU-100 in Example 1, and the unstretched film was prepared by setting the surface temperature of the metal drum to 30 ° C.
- a biaxially oriented white polypropylene film and a receiving sheet for thermal transfer recording were obtained in the same manner as in Example 1 except that was prepared.
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force
- Tables 2 and 3 show the finolem characteristics and the characteristics of the receiving sheet for thermal transfer recording.
- This finolem has low porosity in the film and low uniformity due to the low / 3 crystal ratio of ⁇ crystal ⁇ , and therefore has high specific gravity, high F2 value and poor creasing resistance.
- Whiteness, optical density OD, and cushion rate are low.
- the values of L, a, and b are out of the range of the film of the present invention, and the thermal conductivity is high. Poor sensitivity as a receiving sheet for thermal transfer recording. Met.
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force
- Tables 2 and 3 show the finolem characteristics and the characteristics of the receiving sheet for thermal transfer recording.
- This film has low crystallinity, whiteness, optical density OD, and low cushion ratio L, a, and b are out of the range of the film of the present invention, and the resin has a melting temperature of 132 ° C.
- the recording paper contracted and curled due to heat at the time of transfer when used as a thermal transfer recording receiving sheet, resulting in poor sensitivity.
- Example 1 In place of j3 crystal PP of Example 1, 84.9% by weight of H—PP and 0.1% by weight of j3 crystal nucleating agent NU-100, and polystyrene (manufactured by Asahi Kasei Corporation, “Stylon” 666, Tg80 ° C, hereinafter abbreviated as PS) Example 1 was repeated except that a 15% by weight mixture was used, the temperature of the extruder was 260 ° C, the surface temperature of the metal drum was 30 ° C, and an unstretched film was produced. Biaxially oriented white as in 1 A polypropylene film and a receiving sheet for thermal transfer recording were obtained.
- PS polystyrene
- Table 1 shows the resin composition of the biaxially oriented white polypropylene film obtained by force
- Tables 2 and 3 show the finolem properties and the properties of the receiving sheet for thermal transfer recording.
- PS drops off during the film formation and adheres to the stretching rolls, resulting in poor process passability.
- the average surface roughness is large, so the surface gloss is low, and the MD and TD F2 values are low.
- the sum exceeded 70 MPa, and the fold wrinkle resistance was poor, and the sensitivity was poor as a receiving sheet for thermal transfer recording.
- a biaxially oriented white polypropylene film and a heat-sensitive transfer recording sheet were obtained in the same manner as in Example 1, except that the amount of the mixture was used.
- the resin composition is shown in Table 1, and the film characteristics and the characteristics of the receiving sheet for thermal transfer recording are shown in Tables 2 and 3.
- This film has voids because the voids in the film are CaCO-based voids.
- the L value is low.
- the a value is +6, the b value is +1.0, and the film is yellowish.
- the image becomes dark overall, and the red and yellow colors become strong overall, which is not preferable as a receiving sheet.
- a biaxially stretched film and a heat-sensitive transfer recording sheet were obtained in the same manner as in Example 1, except that high-crystalline polypropylene F300SV was used in place of H-PP in Example 1.
- Table 1 shows the resin composition
- Tables 2 and 3 show the properties of the film and the properties of the receiving sheet for thermal transfer recording. Since the melting temperature of this film exceeds 172 ° C, film breakage occurs frequently during film formation, resulting in poor productivity.
- the average surface roughness Ra of the obtained film is as large as 1 zm, and the surface gloss is 10%. %, The sensitivity was poor as a receiving sheet for thermal transfer recording.
- Low density polyethylene manufactured by Sumitomo Chemical Co., Ltd., "Sumikasen” L705, MFR: 7 g / 10 min (190 ° C), hereinafter abbreviated as LDPE
- LDPE Low density polyethylene
- H-PP H-PP
- NU-100 0.1% by weight and an average particle size of 4 ⁇ calcium carbonate (CaCO) (Shiroishi Calcium Co., Ltd.)
- the unstretched film was stretched 6 times vertically at 80 ° C to obtain a uniaxially oriented white film and a receiving sheet for thermal transfer recording.
- the force and the resin composition of the white film thus obtained are shown in Table 1, and the film properties and the properties of the receiving sheet for thermal transfer recording are shown in Tables 2 and 3.
- This film is inferior in process passability due to CaCO falling off during film formation and adhering to a stretching roll.
- the surface gloss is low, and the melting temperature of the resin is low, so when printing on the receiving sheet for thermal transfer recording, the receiving sheet curls and fuses to the thermal head. And the sensitivity was poor.
- the white film of the thirteenth embodiment of the present invention has substantially no nuclei and uniform and fine voids, and has an appropriate porosity, surface glossiness, and F2 value.
- the range is controlled. As a result, it does not deteriorate the fold wrinkle resistance, has a high glossiness, has a high cushioning rate, and has excellent optical characteristics.
- the glossiness and F2 value are further increased, making it possible to produce films stably. It is possible and has excellent productivity.
- Such a thermal transfer recording receiving sheet using a white film as a base material has improved adhesion to a thermal head of a printer and suppresses dissipation of heat supplied from the thermal head. Very high sensitivity compared to conventional white film.
- the whole resin of layer A and the whole resin of layer B of the biaxially oriented polypropylene white film of the fourth embodiment were prepared as follows.
- WF836DG3 (hereinafter, abbreviated as HPPl) to 99.9 wt 0/0, NU 100 to the resin composition 100 parts by weight were mixed in a ratio of 0/1 by weight 0/0, as an antioxidant, Ciba Geigy Corporation 15 parts by weight of IRGANOXIOIC ⁇ O.
- IRGAFO S168 as a heat stabilizer were added to a heated twin-screw extruder.
- Homopolypropylene F107BV manufactured by Mitsui Chemicals, Inc. (MFR: 7gZ10 content, II: 98%; hereinafter abbreviated as hPP2) 99.6% by weight, spherical silica particles having an average particle size of 1.7 xm (Mizusawa Chemical AMT-20S; Co., Ltd .; hereinafter, it may be simply abbreviated as Si ⁇ ) 0.2% by weight, rosin
- Crystalline nucleating agent a (Pine Crystal KM_1600, manufactured by Arakawa Chemical Co., Ltd.) was added in an amount of 0.2% by weight and supplied to a heated twin-screw extruder. Melted at 280 ° C * After kneading, the mixture was extruded in a gut shape, cooled through a water bath at 20 ° C, cut into 5 mm lengths with a chip cutter, and dried at 100 ° C for 2 hours.
- the whole resin of the layer A is supplied to a heated extruder (a), melted and kneaded at 210 ° C, filtered through a 35 zm cut leaf disk type filter, and then multi-manifold type. Was introduced into the two-layer composite base.
- the entire resin of the layer B was supplied to the heated extruder (b), melted and kneaded at 260 ° C., filtered with a 35 / im cut wire mesh filter, and introduced into the above-mentioned die. .
- the molten polymer of the extruder (b) was laminated on one side of the molten polymer of the extruder (a) in the die and co-extruded into a sheet.
- the molten polymer laminate obtained in this manner was extruded into a sheet shape from a die so that the layer B was in contact with the metal drum, and was solidified on a metal drum maintained at a surface temperature of 120 ° C. It was formed into a sheet. At this time, a 60 ° C air was sprayed from the ND side of the sheet using an air knife to bring the sheet into close contact with the drum. In addition, the contact time with the metal drum was 20 hectares.
- the obtained unstretched laminated sheet was guided to an oven heated to 125 ° C, preheated, stretched 4 times in the machine direction, and cooled by a cooling roll at 100 ° C.
- the longitudinally stretched film was introduced into a tenter while holding both ends of the film with clips, preheated at 150 ° C, and stretched 8 times in the transverse direction in an atmosphere heated to 145 ° C.
- heat set in order to complete the crystal orientation of the biaxially oriented white polypropylene film and to provide flatness and dimensional stability, heat set at 160 ° C while giving 5% relaxation in the transverse direction in the tenter. Then, the mixture was gradually cooled, and then cooled to room temperature.
- the surface of layer B of the obtained white film was subjected to corona discharge treatment under a mixed atmosphere of 80% nitrogen volume and 20% carbon dioxide gas volume.
- the surface opposite to layer B was subjected to corona discharge treatment in air.
- the treatment speed at this time was 15 W. min / m 2
- the wet tension on the surface of the layer B was 42 mNZm
- the wet tension on the opposite surface was 37 mN / m.
- a receptor layer was applied on the layer B by the method of [Measurement Method and Evaluation Method of Properties] (30) to be processed into a receptor sheet for thermal transfer recording.
- Table 417 shows the resin composition, film-forming conditions, film properties, and receiving sheet properties of the obtained biaxially oriented white polypropylene film and receiving sheet.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. In addition, since it has a substantially void-free uniform and dense void, it has a low specific gravity and a high cushioning rate to the extent that the wrinkle resistance is not deteriorated. , B value).
- the heat-sensitive transfer recording receiving sheet using such a white film as a substrate and having a receiving layer formed on the layer B had a high adhesive force of the receiving layer and was extremely high in sensitivity.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- Example 12 a known ethylene 'propylene random copolymer manufactured by Sumitomo Chemical Co., Ltd. (ethylene copolymerization amount: 1% by weight, MFR: 4 gZlO content, II: 97%; hereinafter, simply abbreviated as rEPCl) 98 1.5% by weight of SiO particles to 3% by weight, organophosphate metal salt
- a resin composition containing a polycrystalline nucleating agent (“Adeka Stab” NA-11 manufactured by Asahi Denka Kogyo Co., Ltd.) at a ratio of 0.2% by weight was used.
- the entire resin of the layer A is supplied to the heated extruder (a) and melted and kneaded at 210 ° C. After filtering through a 35 / im cut leaf disk type filter, it was introduced into a multi-manifold type three-layer composite base. Next, the entire resin of the layer B was supplied to the heated extruder (b), melted and kneaded at 260 ° C., filtered with a 35 / im cut wire mesh filter, and introduced into the above-mentioned die. . The molten polymer of the extruder (b) was laminated on both sides of the molten polymer of the extruder (a) in a die and co-extruded into a sheet.
- the thus obtained molten polymer laminate was extruded into a sheet shape from a die so that the layer B was in contact with the metal drum, and was solidified on a metal drum maintained at a surface temperature of 110 ° C. It was formed into a sheet. At this time, a 60 ° C air was sprayed from the ND side of the sheet using an air knife to bring the sheet into close contact with the drum. The contact time with the metal drum was about 20 hectares.
- a biaxially oriented white polypropylene film was produced under the same conditions as in Example 12. Further, using the obtained white film as a substrate, a receiving layer was formed on the B layer on the D side under the same conditions as in Example 12 to prepare a receiving sheet.
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. In addition, since it had a substantially void-free uniform and dense void, the specific gravity was low and the cushion ratio was high enough not to deteriorate the wrinkle resistance. Further, fine voids were formed in the layer B forming the receiving layer, and the layer had good optical characteristics. Using such a white film as a base material, the receiving sheet for thermal transfer recording in which the receiving layer was formed on the B layer had extremely high sensitivity due to the high adhesive strength of the receiving layer.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- the chip prepared in Example 11 was used.
- Example 11 a crosslinked polymethylmetallic having an average particle size of 2 / im was used in place of the Si particles.
- Rate particles manufactured by Nippon Shokubai Co., Ltd., M1002; hereinafter may be simply abbreviated as cross-linked PMMA
- PMMA Polymethyl methacrylate
- Pyrene, Basell polypropylene PF_814 MFR: 3 g / lO content, II: 97%; hereinafter, sometimes abbreviated simply as HMS-PP was added at a ratio of 3% by weight.
- HMS-PP Basell polypropylene PF_814
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. Further, since it had a substantially nuclear-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high so that the wrinkle resistance did not deteriorate.
- the receiving sheet for thermal transfer recording in which such a white film was used as the base material and the receiving layer was formed on the layer B had extremely high sensitivity because the adhesive strength of the receiving layer was high.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- the chip prepared in Example 10 was used.
- Example 11 0.2% by weight of Si ⁇ particles were used as a crystal nucleating agent (“Pine Crystal”).
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. Further, since it had a substantially nuclear-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high so that the wrinkle resistance did not deteriorate.
- the receiving sheet for thermal transfer recording in which the receiving layer was formed on the B layer had extremely high sensitivity due to the high adhesive strength of the receiving layer.
- the whole resin of layer A, the whole resin of layer B, and the whole resin of another layer (layer C) were prepared as follows.
- Example 10 Production was performed under the same conditions as in Example 10 except that the crystal nucleating agent-added polypropylene “BEP ⁇ L” B_022_SP (abbreviated as ⁇ ) was mixed at a ratio of 50% by weight instead of the nucleating agent in Example 10. The used chip was used.
- the chip prepared in Example 12 was used.
- the whole resin of the layer A was supplied to a heated extruder (a), melted and kneaded at 210 ° C, filtered with a 35 zm cut leaf disk type filter, and then multi-manifold type. Was introduced to the three-layer composite base.
- the entire resin of the layer B was supplied to the heated extruder (b), melted and kneaded at 260 ° C., filtered with a 35 / im cut wire mesh filter, and introduced into the above-mentioned die.
- the whole resin of the layer C was supplied to a heated extruder (c), melted and kneaded at 260 ° C., filtered through a 35-m cut wire mesh filter, and then introduced into the die.
- the thus obtained molten polymer laminate was extruded from a die into a sheet shape so that the layer B was in contact with the metal drum, and was solidified on a metal drum maintained at a surface temperature of 120 ° C. It was molded into a sheet shape. At this time, the surface of the sheet not in contact with the metal drum (hereinafter simply referred to as the ND surface in some cases) was blown with air at 60 ° C using an air knife to bring the sheet into close contact with the drum. The contact time with the metal drum was 20 seconds.
- the wetting tension on the surface of layer B of the obtained white film was 37 mN / m, and the wetting tension on the surface of layer C was 42 mN / m.
- the whole resin of the A layer, the whole resin of the B layer, and the whole resin of the C layer were prepared as follows.
- hPPl 94.8% by weight, / 3% nucleating agent NU-100 0.2% by weight, low-density polyethylene as a polyolefin-based elastomer resin by the meta-mouth catalyst method (Dupont Welastomer Japan K.K.) MFR: 18 g / lO (190.C); hereinafter abbreviated as “mV LDPE”) 0.15 parts by weight of IRGANOX 1010 to 100 parts by weight of a resin composition mixed at a ratio of 5% by weight And 0.1 part by weight of IRGAFOS168 was added and fed to a heated twin-screw extruder.
- mV LDPE molefin-based elastomer resin
- the mixture was melted and kneaded at 300 ° C, extruded in a gut shape, cooled through a water bath at 20 ° C, cut into 5 mm lengths with a chip cutter, and dried at 100 ° C for 2 hours.
- the chip prepared in Example 10 was used.
- ethylene / propylene random copolymer FM401G (ethylene copolymerization amount: 4 wt%, MFR: 7 g / 10 min; hereinafter abbreviated as rEPC2) 99.8 wt%, SiO particles
- a biaxially oriented white polypropylene film was produced under the same conditions as in Example 14, except that the entire resin of the layer A, the entire resin of the layer B, and the entire resin of the layer C were used. Using the obtained white film as a substrate, a receiving layer was formed on the C layer on the ND surface side under the same conditions as in Example 10 to produce a receiving sheet.
- the whole resin of the A layer, the whole resin of the B layer, and the whole resin of the C layer were prepared as follows.
- Example 15 1% by weight of HMS-PP was used instead of the nucleating agent, and
- a biaxially oriented white polypropylene film was produced under the same conditions as in Example 5 except that the entire resin of the layer A, the entire resin of the layer B, and the entire resin of the layer C were used.
- a receiving layer was formed on the C layer on the ND surface side under the same conditions as in Example 10 to produce a receiving sheet.
- the average dispersion diameter of PMP in layer B and layer C is 0.6 ⁇ m.
- Example 15 a biaxially oriented white polypropylene film was produced under the same conditions except that the line speed was increased by increasing the peripheral speed of the metal drum. The contact time with the metal drum was 13 seconds. Using the obtained white film as a substrate, a receiving layer was formed on the C layer on the ND surface side under the same conditions as in Example 10 to produce a receiving sheet.
- a biaxially oriented white polypropylene film was produced under the same conditions as in Example 17 except that the peripheral speed of the metal drum was further increased.
- the contact time with the metal drum was 10 seconds.
- a receiving layer was formed on the C layer on the ND surface side under the same conditions as in Example 10 to produce a receiving sheet.
- a biaxially oriented white polypropylene film was produced in the same manner as in Example 12, except that the surface temperature of the metal drum was raised to 125 ° C. Using the obtained white film as a substrate, a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 to produce a receiving sheet.
- the results are shown in Tables 417.
- the obtained white film did not stick to the metal drum even when the surface temperature of the metal drum was raised, and was excellent in film forming property and process passability.
- no crater-like defects were found on the surface of the finolem after biaxial stretching. Reflecting this, the surface roughness of layer B was small and the glossiness was high. Further, since it had a substantially void-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high so that the wrinkle resistance did not deteriorate.
- the receiving sheet for thermal transfer recording in which a receiving layer was formed on the B layer using such a white film as a base material, had extremely high sensitivity because the adhesive strength of the receiving layer was high.
- Example 19 a biaxially oriented white polypropylene film was produced under the same conditions except that the oven temperature in longitudinal stretching was increased to 130 ° C. Further, a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 by using the obtained white film as a substrate, and a receiving sheet was produced.
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. Further, since it had a substantially nuclear-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high so that the wrinkle resistance did not deteriorate.
- the receiving sheet for thermal transfer recording in which the receiving layer was formed on the B layer had extremely high sensitivity due to the high adhesive strength of the receiving layer.
- Example 15 the B layer was laminated on both sides of the A layer, and the thickness configuration of the film was changed to the B layer ZA layer A biaxially oriented white polypropylene film was produced under the same conditions except that the / B layer was set to 2/21/2 / im. Further, using the obtained white film as a base material, a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 to produce a receiving sheet.
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. Further, since it had a substantially nuclear-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high so that the wrinkle resistance did not deteriorate.
- the receiving sheet for thermal transfer recording in which the receiving layer was formed on the B layer had extremely high sensitivity due to the high adhesive strength of the receiving layer.
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer B was small and the glossiness was high. Further, since it had a substantially nuclear-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high so that the wrinkle resistance did not deteriorate.
- the receiving sheet for thermal transfer recording in which such a white film was used as the base material and the receiving layer was formed on the layer B had extremely high sensitivity because the adhesive strength of the receiving layer was high.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- the results are shown in Tables 417.
- the resulting white film does not stick to the metal drum and has excellent film forming properties and process passability even when the longitudinal stretching ratio is increased, so that the productivity is excellent. Further, since no crater-like defects were observed on the film surface after biaxial stretching, the surface roughness of layer B was small and the glossiness was high. Reflecting this, the surface roughness of layer B was small and the glossiness was high. Further, since it had a substantially void-free uniform and dense void, it had good optical properties such that the specific gravity was low and the cushion ratio was high to such an extent that the wrinkle resistance did not deteriorate.
- the heat-sensitive transfer recording receiving sheet in which such a white film was used as the base material and the receiving layer was formed on the B layer had extremely high sensitivity due to the high adhesive strength of the receiving layer.
- a biaxially oriented white polypropylene film was produced in the same manner as in Example 23 except that the longitudinal stretching ratio was increased to 6 times.
- a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 to produce a receiving sheet.
- the results are shown in Tables 417.
- the resulting white film does not stick to the metal drum and has excellent film forming properties and process passability even when the longitudinal stretching ratio is increased, so that the productivity is excellent. Further, since no crater-like defects were observed on the film surface after biaxial stretching, the surface roughness of layer B was small and the glossiness was high. In addition, since it had a substantially void-free uniform and dense void, it had a low specific gravity and a high cushioning ratio to such an extent that the wrinkle resistance did not deteriorate, and had good optical characteristics.
- the receiving sheet for thermal transfer recording in which a receiving layer is formed on the B layer using such a white film as a substrate, has extremely high sensitivity due to the high adhesive strength of the receiving layer. Was high.
- a biaxially oriented white polypropylene film was produced in the same manner as in Example 23 except that the longitudinal stretching ratio was set to 4 times.
- an anchor layer having the following composition was applied onto layer B on the D side of the obtained white film so that the thickness after drying was 2 ⁇ m.
- polyester urethane water-dispersible resin (“Hydran” AP-40F; solids concentration 30%): 100 parts by weight
- N-methylpyrrolidone 15 parts by weight
- a receiving layer was formed on the anchor layer under the same conditions as in Example 10 to produce a receiving sheet.
- the results are shown in Tables 417.
- the obtained white film did not adhere to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were found on the film surface after biaxial stretching. Reflecting this, the surface roughness of the layer was small and the glossiness was high. In addition, since it had a substantially void-free uniform and dense void, the specific gravity was low and the cushion ratio was high enough not to deteriorate the wrinkle resistance.
- the receptor layer on the anchor layer which has excellent adhesion to the receptor layer, it can be used for thermal transfer recording using a white film as a base material with extremely high adhesion to the receptor layer.
- the receiving sheet was extremely sensitive.
- PP polypropylene
- rEPC ethylene 'propylene random copolymer, crystal nucleus ffl-added polypropylene
- tl / 2 semi-formed S-formed W-formed S-forming temperature
- PMP polymethylpentene
- Si02 silica particles
- PMMA polymethyl methacrylate
- Ff bEPC ⁇ -nucleus ffl-added ethylene-propylene block copolymer
- CD Casting drum, A: A layer, B: B layer, C: C layer
- Thickness J3 S Practically surface Average surface Surface
- Example 10 25 o 0.57 OX 0.1 130 0.24 O Example 1 1 35 o 0.62 0 X 1.2 85 0.45 o Example 1 2 35 o 0.53 OX 0.15 103 0.33 o Example 13 35 o 0.56 OX 0.1 125 0.27 o Actual A 14 35 o 0.69 OX 0.15 103 0.33 o Example 15 35 o 0.56 o X 0.1 125 0.25 o Example 16 35 o 0.57 o X 2.7 70 0.47 o Example 17 35 o 0.6 o X 0.1 125 0.27 o Example 0118 35 o 0.65 o X 0.1 125 0.27 o Example 19 35 o 0.5 o X 0.15 103 0.33 o Implementation «20 35 o 0.55 o X 0.15 98 0.37 o Implementation ⁇ 21 25 o 0.53 o X 0.15 98 0.37 o Implementation ⁇ 21 25 o 0.53 o X 0.15 98 0.37 o Implementation ⁇ 21 25
- Ra Average surface roughness, measured for the skin layer (B layer) on the D side.
- the white film of the fourth embodiment of the present invention has a ⁇ -crystal activity, a substantially nucleated layer having uniform and fine voids, and a high crystallization rate.
- the layer B is laminated, and the specific gravity is controlled in an appropriate range. As a result, it is possible to produce a film having a small surface roughness, a high gloss, a high cushioning ratio, and excellent optical properties without deteriorating the folding wrinkle resistance. In short, these characteristics can be controlled by the raw material composition and film forming conditions.
- the thermal transfer recording receiving sheet using such a white film as a base material has improved adhesion to the thermal head of the printer and suppresses the dissipation of heat supplied from the thermal head. Very high sensitivity compared to conventional white film.
- Example 10 the entire resin of the A layer prepared under the same conditions except that the addition amount of the j3 nucleating agent was 0.05% by weight was supplied to a heated extruder (a). The mixture was melted and kneaded at 210 ° C., filtered with a 35 zm cut leaf disk filter, and then introduced into a single-layer die. Next, the molten polymer was extruded into a sheet, solidified on a metal drum maintained at a surface temperature of 120 ° C., and formed into a sheet. At this time, the sheet was brought into close contact with the drum by blowing air at 60 ° C from the ND surface using an air knife. The contact time with the metal drum was 20 seconds.
- Example 10 Using the obtained unstretched sheet, under the same conditions as in Example 10, a biaxially oriented microporous film having a thickness of 35 ⁇ m was produced. Using the obtained microporous film as a substrate, a receiving layer was formed on the surface on the D side of the film under the same conditions as in Example 10 to produce a receiving sheet.
- the results are shown in Tables 8-11.
- the obtained microporous film did not stick to the metal drum, and was excellent in film forming property and process passability. No crater-like defects were observed on the film surface after biaxial stretching. However, since the layer B was not laminated, there was no glossiness. Also, because of the through-holes, when the receiving layer was applied, the coating agent penetrated into the finolem and there was no glossiness after processing into the receiving sheet. Furthermore, the adhesive strength of the receiving layer was low, probably because a large amount of voids existed in the surface layer of the film.
- a biaxially oriented microporous film having a thickness of 35 x m was produced under the same conditions except that the entire resin of the layer A used in Example 10 was used.
- a receiving layer was formed on the D-side surface of the film under the same conditions as in the example to prepare a receiving sheet.
- Comparative Example 7 a biaxially oriented microporous film having a thickness of 35 x m was produced under the same conditions as in Example 11 except that the entire resin of layer A was used. Using the obtained microporous film as a substrate, a receiving layer was formed on the D-side surface of the film under the same conditions as in the example to prepare a receiving sheet.
- the results are shown in Tables 8-11.
- the obtained microporous film did not stick to the metal drum, and was excellent in film forming property-process passability.
- a crater-shaped defect was not found on the film surface after biaxial stretching.
- the layer B was not laminated, there was no glossiness.
- the coating agent permeated into the finolem, and there was no glossiness even after processing into the receiving sheet.
- the adhesive strength of the receiving layer was low, probably because a large amount of voids existed in the surface layer of the film.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- the chip prepared in Example 11 was used.
- a biaxially oriented white polypropylene film was produced under the same conditions as in Example 12, except that the entire resin of layer A and the entire resin of layer B were used and the thickness configuration was 3Z29Z3 x m.
- a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 to produce a receiving sheet.
- Example 12 the thickness composition was changed to 3Z2 without adding HMS-PP to the entire resin of layer B.
- a biaxially oriented white polypropylene film was produced under the same conditions except that the thickness was 9/3 ⁇ m.
- a receiving layer was formed on the B layer on the D surface side under the same conditions as in Example 10 to produce a receiving sheet.
- the glossiness of the layer B was extremely low.
- the receiving sheet for thermal transfer recording in which the white film was used as a substrate and the receiving layer was formed on the layer B, had low sensitivity.
- Comparative Example 10 an attempt was made to produce a biaxially oriented white polypropylene film under the same conditions except that the line speed was increased by increasing the peripheral speed of the metal drum.
- the contact time with the metal drum was 13 seconds.
- Comparative Example 12 an attempt was made to produce a biaxially oriented white polypropylene film under the same conditions except that the peripheral speed of the metal drum was further increased.
- the contact time with the metal drum was 10 seconds.
- Comparative Example 10 an attempt was made to produce a biaxially oriented white polypropylene film under the same conditions except that the surface temperature of the metal drum was raised to 125 ° C.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- Example 10 Homopolypropylene FS2016 manufactured by Sumitomo Chemical Co., Ltd. (MFR: 2.3 g / 10 min, 11: 96.5%; hereinafter, sometimes simply referred to as hPP4) 83.4% by weight of j3 0.1% by weight of NU-100 as a crystal nucleating agent and polycarbonate as an incompatible resin ("Teflon" VIII 1500, manufactured by Idemitsu Chemical Co., Ltd .; 1 ⁇ ? 13 ⁇ 4: 65 ⁇ / 10 min (300. Ding ⁇ :.
- the whole layer of the resin was supplied to the heated extruder (a), melted and kneaded at 280 ° C, filtered through a 35 / im cut leaf disk filter, and then multi-manifold. It was introduced into the three-layer composite die of the mold.
- the entire resin of the layer B was supplied to the heated extruder (b), melted and kneaded at 260 ° C., filtered with a 35 / im cut wire mesh filter, and introduced into the above-mentioned die. .
- the molten polymer of the extruder (b) was laminated on both sides of the molten polymer of the extruder (a) in a die and co-extruded into a sheet.
- the molten polymer laminate thus obtained was extruded from a die into a sheet shape so that the layer B was in contact with the metal drum, and was solidified on a metal drum maintained at a surface temperature of 80 ° C. It was molded into a sheet shape. At this time, the sheet was brought into close contact with the drum by blowing air at 30 ° C from the ND side of the sheet using an air knife. The contact time with the metal drum was 20 seconds.
- the longitudinally stretched film was introduced into a tenter while holding both ends of the film with clips, preheated at 165 ° C, and stretched 9 times in the transverse direction in an atmosphere heated to 165 ° C.
- heat set in order to complete the crystal orientation of the biaxially oriented white polypropylene film and to add flatness and dimensional stability, heat set at 160 ° C while giving 8% relaxation in the transverse direction in the tenter. Then, the mixture was gradually cooled, and then cooled to room temperature.
- the B layer surface on the D side of the obtained white film was subjected to corona discharge treatment on the B layer surface on the ND side in air. did.
- the treatment speed at this time was 15 W'min / m 2
- the wet tension on the B layer surface on the D surface side was 42 mNZm
- the wet tension on the B layer surface on the ND surface side was 37 mN / m.
- the whole resin of the layer A and the whole resin of the layer B were prepared as follows.
- Ethylene propylene block copolymer obtained by adding j3 crystal nucleating agent to hPP4, 60% by weight (manufactured by Sunoco Chemicals, "BEP ⁇ L" BI-4020-SP, MFR: 2 g / lO min .; / 3 b EPC ) In a ratio of 40% by weight and fed to a heated twin screw extruder. After melting and kneading at 270 ° C, the mixture was extruded in a gut shape, cooled through a water bath at 20 ° C, cut into 5 mm lengths with a chip cutter, and dried at 100 ° C for 2 hours. .
- the above / 3 bEPC was used.
- the whole resin of the layer A was supplied to the heated extruder (a), melted and kneaded at 210 ° C, filtered with a 35 / im cut leaf disk type filter, and then multi-manifold. It was introduced into the three-layer composite die of the mold.
- the whole resin of the layer B was supplied to the heated extruder (b), melted and kneaded at 240 ° C., filtered with a 35-zm cut wire mesh filter, and introduced into the above-mentioned die.
- the molten polymer of the extruder (b) was laminated on both sides of the molten polymer of the extruder (a) in a die and co-extruded into a sheet.
- the molten polymer laminate obtained in this manner was extruded into a sheet shape from a die so that the B layer was in contact with the metal drum, and was solidified on a metal drum maintained at a surface temperature of 120 ° C. It was molded into a sheet shape. At this time, the sheet was brought into close contact with the drum by blowing air at 60 ° C from the ND surface of the sheet using an air knife. The contact time with the metal drum was 20 seconds.
- a biaxially oriented white polypropylene film was produced under the same conditions as in Example 10 except that the oven temperature in longitudinal stretching was set at 110 ° C. Further, using the obtained white film as a substrate, a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 to produce a receiving sheet.
- the whole resin of the layer A was prepared as follows.
- the mixture was extruded in a gut shape, cooled through a water bath at 20 ° C, cut into 5 mm lengths with a chip cutter, and dried at 100 ° C for 2 hours.
- the entire resin of the layer A is supplied to the heated extruder (a), melted and kneaded at 200 ° C, filtered through a 60-zm-cut wire mesh filter, and introduced into a single-layer die. did.
- the molten polymer was extruded into a sheet, solidified on a metal drum maintained at a surface temperature of 90 ° C., and formed into a sheet.
- the sheet was brought into close contact with the drum by blowing air at 30 ° C from the ND surface using an air knife.
- the contact time with the metal drum was 20 seconds
- the obtained unstretched sheet was guided to an oven heated to 120 ° C, preheated, stretched 4.5 times in the machine direction, and cooled with a cooling roll at 100 ° C.
- the longitudinally stretched film was introduced into a tenter while holding both ends of the film with clips, preheated at 140 ° C, and stretched 10 times in the transverse direction in an atmosphere heated to 135 ° C.
- the crystal orientation of the biaxially oriented white polypropylene film and to impart flatness and dimensional stability it was heat-set at 150 ° C while giving 5% relaxation in the transverse direction in the tenter. After cooling uniformly, it was cooled to room temperature.
- the surface on the D side of the obtained white film was subjected to corona discharge treatment on the surface on the ND side in air.
- the treatment speed at this time was 15 W * min / m 2
- the wetting tension on the D-side surface was 42 mN / m
- the wetting tension on the ND-side surface was 37 mN / m.
- the thickness of the obtained white film was 35 ⁇ m.
- a receiving layer was formed on the surface on the D-side of the film under the same conditions as in Example 10 by using the obtained white film as a substrate, and a receiving sheet was produced.
- the coating agent partially penetrates into the film, and the receiving sheet has a large amount of voids on the film surface, which is not glossy. .
- the receiving sheet for thermal transfer recording in which the receiving layer was formed on the B layer using this white film as a substrate had extremely low sensitivity.
- Comparative Example 11 a biaxially oriented white polypropylene film was produced under the same conditions except that the surface temperature of the metal drum was lowered to 100 ° C. Using the obtained white film as a substrate, a receiving layer was formed on the B layer on the D side under the same conditions as in Example 10 to produce a receiving sheet.
- Example 11 except that the following entire resin of the layer A and the entire resin of the layer B were used, An attempt was made to produce a biaxially oriented white polypropylene film under the same conditions.
- Example 11 a resin composition in which Si ⁇ particles were added at a ratio of 0.3% by weight was used.
- the results are shown in Tables 8-11.
- the unstretched sheet thus obtained was a finolem that could not be produced industrially because it did not have ⁇ -crystal activity, and the film was frequently torn in biaxial stretching, especially in the transverse stretching step.
- the white film according to the fourth embodiment of the present invention has a ⁇ -crystal activity, a substantially nonnucleated layer having uniform and fine voids, and a high crystallization rate.
- ⁇ Layers are stacked, and the specific gravity is controlled in an appropriate range.
- the receiving sheet for thermal transfer recording using such a white film as a base material has improved adhesion to a thermal head of a printer, and dissipates heat supplied from the thermal head. Due to the suppression, the sensitivity is extremely high as compared with the conventional white film.
- the biaxially oriented white polypropylene film of the present invention achieves both high sensitivity when used as a base material of a receiving sheet and high productivity that is strongly required for a receiving sheet for thermal transfer recording.
- Such a white film is not particularly limited, but, for example, the following applications are possible.
- the white film of the present invention can be widely used not only for thermal transfer recording, but also for packaging and industrial uses as described above.
- the biaxially oriented white polypropylene film of the present invention has a low specific gravity, a high whiteness, an optical density, and a high cushioning ratio with the surface gloss and the sum of the F2 values of MD and TD within a specific range. Accordingly, it can be suitably used for a high-sensitivity heat-sensitive transfer recording receiving sheet, and can be used for food packaging applications and labels for which this property is active.
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020067014404A KR101097136B1 (ko) | 2003-12-26 | 2004-12-21 | 감열전사기록용 2축배향 백색 폴리프로필렌 필름 및그것으로 이루어지는 감열전사기록용 수용시트 |
CA2551526A CA2551526C (en) | 2003-12-26 | 2004-12-21 | Biaxially oriented white polypropylene film for thermal transfer recording and receiving sheet for thermal transfer recording therefrom |
DE602004020802T DE602004020802D1 (de) | 2003-12-26 | 2004-12-21 | Biaxial ausgerichtete weisse polypropylenfolie für wärmeübertragungsaufzeichnung und aufnahmebogen für wärmeübertragungsaufzeichnungen davon |
EP04807409A EP1702761B1 (en) | 2003-12-26 | 2004-12-21 | Biaxially oriented white polypropylene film for thermal transfer recording and receiving sheet for thermal transfer recording therefrom |
US10/584,741 US20070154662A1 (en) | 2003-12-26 | 2004-12-21 | Biaxially oriented white polypropylene film for thermal transfer recording and receiving sheet for thermal transfer recording therefrom |
AT04807409T ATE429330T1 (de) | 2003-12-26 | 2004-12-21 | Biaxial ausgerichtete weisse polypropylenfolie für wärmeübertragungsaufzeichnung und aufnahmebogen für wärmeübertragungsaufzeichnungen davon |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-431981 | 2003-12-26 | ||
JP2003431981 | 2003-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005063496A1 true WO2005063496A1 (ja) | 2005-07-14 |
Family
ID=34736458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/019052 WO2005063496A1 (ja) | 2003-12-26 | 2004-12-21 | 感熱転写記録用二軸配向白色ポリプロピレンフィルムおよびそれからなる感熱転写記録用受容シート |
Country Status (9)
Country | Link |
---|---|
US (1) | US20070154662A1 (ja) |
EP (1) | EP1702761B1 (ja) |
KR (1) | KR101097136B1 (ja) |
CN (1) | CN100450785C (ja) |
AT (1) | ATE429330T1 (ja) |
CA (1) | CA2551526C (ja) |
DE (1) | DE602004020802D1 (ja) |
TW (1) | TWI319357B (ja) |
WO (1) | WO2005063496A1 (ja) |
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EP2018962A1 (en) * | 2006-05-16 | 2009-01-28 | Toray Industries, Inc. | Biaxially oriented white polypropylene film, reflective plate, and receiving sheet for thermal transfer recording |
US20090136714A1 (en) * | 2006-02-17 | 2009-05-28 | Tatsuya Itou | Biaxially Oriented Polypropylene Film |
US20090191388A1 (en) * | 2008-01-29 | 2009-07-30 | Fina Technology, Inc. | Modifiers for Oriented Polypropylene |
WO2013054929A1 (ja) * | 2011-10-14 | 2013-04-18 | 東レ株式会社 | 多孔性ポリプロピレンフィルムおよび蓄電デバイス |
WO2015093339A1 (ja) * | 2013-12-18 | 2015-06-25 | 大日本印刷株式会社 | 熱転写受像シート用裏面基材、及び熱転写受像シート |
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WO2008129715A1 (ja) * | 2007-03-30 | 2008-10-30 | Fujifilm Corporation | 空洞含有樹脂成形体及びその製造方法、並びに、昇華転写記録材料用又は熱転写記録材料用の受像フィルム又はシート |
US8329287B2 (en) * | 2007-03-30 | 2012-12-11 | Fujifilm Corporation | Void-containing resin molded product, production method therefor, and reflective plate |
KR101147013B1 (ko) * | 2007-09-28 | 2012-05-17 | 도레이 카부시키가이샤 | 백색 필름 및 그것을 사용한 면광원 |
WO2012026445A2 (ja) * | 2010-08-27 | 2012-03-01 | 東レ株式会社 | 白色積層フィルムの製造方法および白色積層ポリエステルフィルム |
GB2483653B (en) | 2010-09-14 | 2017-03-22 | Arjobex Ltd | Polymeric label material |
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WO2013152287A1 (en) | 2012-04-06 | 2013-10-10 | Toray Plastics (America), Inc. | Non-chemical thermally printable film |
CN105873992B (zh) * | 2013-12-27 | 2018-11-06 | 东丽株式会社 | 双轴取向聚酯膜 |
WO2016043172A1 (ja) * | 2014-09-19 | 2016-03-24 | 東レ株式会社 | ポリプロピレンフィルムおよびフィルムコンデンサ |
BR112017009046B1 (pt) * | 2014-11-26 | 2021-10-05 | Kimberly-Clark Worldwide, Inc | Película porosa biaxialmente esticada |
KR20220101758A (ko) * | 2016-03-28 | 2022-07-19 | 도요보 가부시키가이샤 | 2축 배향 폴리프로필렌 필름 |
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- 2004-12-21 WO PCT/JP2004/019052 patent/WO2005063496A1/ja active Application Filing
- 2004-12-21 DE DE602004020802T patent/DE602004020802D1/de active Active
- 2004-12-21 KR KR1020067014404A patent/KR101097136B1/ko active IP Right Grant
- 2004-12-21 CA CA2551526A patent/CA2551526C/en not_active Expired - Fee Related
- 2004-12-21 EP EP04807409A patent/EP1702761B1/en not_active Not-in-force
- 2004-12-21 AT AT04807409T patent/ATE429330T1/de not_active IP Right Cessation
- 2004-12-21 US US10/584,741 patent/US20070154662A1/en not_active Abandoned
- 2004-12-24 TW TW093140394A patent/TWI319357B/zh not_active IP Right Cessation
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Publication number | Priority date | Publication date | Assignee | Title |
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US20090136714A1 (en) * | 2006-02-17 | 2009-05-28 | Tatsuya Itou | Biaxially Oriented Polypropylene Film |
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EP2018962A4 (en) * | 2006-05-16 | 2012-05-02 | Toray Industries | BIAXIALLY ORIENTED WHITE POLYPROPYLENE FILM, REFLECTIVE PLATE AND RECEPTION SHEET FOR THERMAL TRANSFER RECORDING |
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Also Published As
Publication number | Publication date |
---|---|
CA2551526C (en) | 2012-11-13 |
EP1702761A4 (en) | 2008-04-02 |
CA2551526A1 (en) | 2005-07-14 |
CN1922029A (zh) | 2007-02-28 |
KR101097136B1 (ko) | 2011-12-22 |
DE602004020802D1 (de) | 2009-06-04 |
EP1702761B1 (en) | 2009-04-22 |
TWI319357B (en) | 2010-01-11 |
KR20070015911A (ko) | 2007-02-06 |
US20070154662A1 (en) | 2007-07-05 |
ATE429330T1 (de) | 2009-05-15 |
EP1702761A1 (en) | 2006-09-20 |
TW200538305A (en) | 2005-12-01 |
CN100450785C (zh) | 2009-01-14 |
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