JPH09136484A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ink absorption, the image quality and the water resistance by a method wherein a receiving layer is formed of a crosslinking polyalkyleneoxide of a specified melt index, which is obtained by making polyalkyleneoxide of a specified average molecular weight and an isocyanate compound react, as the major component. SOLUTION: A receiving layer is formed of a crosslinking polyalkyleneoxide of which the melt index is 0.5-100, which is obtained by making polyalkyleneoxide of which the average molecular weight is 1,000-1,000,000 and an isocyanate compound react, as the major component. Polyalkyleneoxide is polyethyleneoxide, polypropyleneoxide, polybutyleneoxide, and their copolymer or a mixture, etc. Also, for the isocyanate compound, 4,4-diphenylmethane diisocyanate, hexamethylenediisocyanate, 2,4-tolylenediisocyanate are especially preferable, and 1-80 pts.wt. based on 100 pts.wt. of polyalkyleneoxide, is preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet, and more particularly to a recording sheet which enables good color printing by an inkjet printer, has a high image density and is excellent in ink absorption.

[0002]

2. Description of the Related Art With the spread of office automation in recent years, there has been an increasing demand for creating and recording documents in offices, and there has been a demand for a printer with low noise and excellent image quality. Inkjet printers have been put to practical use to satisfy these requirements. In recent years, color copying technology has reached the stage of completion, and color copiers / printers are gradually spreading. Ink jet printers use an ink that is difficult to dry to prevent clogging of nozzles, and the components of this ink are generally those in which a binder, a dye, a solvent, an additive, etc. are dissolved in water. Therefore, it is necessary to use a recording sheet having a high water absorption property, and a special paper having a good ink absorption property is usually used.

[0003]

In general, paper is inferior in water resistance, moisture resistance, and the like. If a plastic film not having these disadvantages can be applied, the advantages can be utilized in various fields.

When a sheet having low ink absorbency is used for copying by an ink jet printer, the ink may be insufficiently dried or may not be dried at all, and the printed portion may become dirty when rubbed with fingers or overlapped. It is virtually unusable. In order to improve these points, in order to improve the ink absorption of the substrate, for example, polyvinyl alcohol, starch, gelatin, cellulose derivatives such as hydroxyethylcellulose and methylcellulose, polyacrylic acid, polymethacrylic acid and salts thereof and the like It has been proposed to provide a water-soluble polymer recording layer, but even if the conventional recording layer satisfies the ink absorbency, the water resistance is poor, and the recording layer or the recording portion dissolves in water and a recorded image is formed. Disappears, the surface becomes sticky, the recorded image bleeds, and blocking occurs when sheets are laminated.

An object of the present invention is to solve the above problems and provide a recording sheet excellent in ink absorption.

[0006]

DISCLOSURE OF THE INVENTION In accordance with the present invention, which is directed to this object, a recording sheet having a receptive layer formed by extrusion lamination on a plastic film, wherein the receptive layer is a polyalkylene oxide having an average molecular weight of 1,000 to 1,000,000. And a cross-linked polyalkylene oxide having a melt index of 0.5 to 100 obtained by reacting an isocyanate compound with the isocyanate compound as a main component. Further, the cross-linked polyalkylene oxide is suitable for extrusion lamination, water resistance, In order to improve printing characteristics, a thermoplastic resin having a melting point of 300 ° C. or less is blended.

[0007]

DETAILED DESCRIPTION OF THE INVENTION As the material of the plastic film in the present invention, polyester, polyolefin,
Polyamide, polyester amide, polyether, polyimide, polyamide imide, polystyrene, polycarbonate, poly-ρ-phenylene sulfide, polyether ester, polyvinyl chloride, and poly (meth) acrylate are preferred. Further, these copolymers, blends, and further cross-linked ones can also be used.

Further, among the above plastic films, polyester, for example, polyethylene terephthalate,
Polyethylene 2,6-naphthalate, polyethylene α,
β-bis (2-chlorophenoxy) ethane 4,4′-dicarboxylate, polybutylene terephthalate and the like. Among them, mechanical properties, workability and other qualities, economic efficiency, etc. Polyethylene terephthalate and polyethylene 2,6-naphthalate are preferred.

The polyester in the present invention is specifically, for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, bis-α, β (2-chlorophenoxy)
At least one of bifunctional carboxylic acids such as ethane 4,4'-dicarboxylic acid, adipic acid, and sebacic acid and at least one of glycols such as ethylene glycol, triethylene glycol, tetramethylene glycol, hexamethylene glycol, and decamethylene glycol. A polyester obtained by polycondensing with a seed can be used.

Further, various kinds of polymers may be blended or copolymerized with the polyester within a range that does not impair the object of the present invention, and an antioxidant, a heat stabilizer, a lubricant, a pigment, an ultraviolet absorber. Etc. may be included.

The intrinsic viscosity of the polyester (measured in orthochlorophenol at 25 ° C.) is usually preferably 0.4 to
2, more preferably selected from the range of 0.5 to 1.

In the present invention, when the recording sheet is used as an OHP film, the total light transmittance of the recording sheet is preferably 70% or more and 95% or less, and 80% or more, 9% or less.
It is more preferably 5% or less. If the total light transmittance is lower than the above range, the image displayed on the screen becomes dark and difficult to see. It is substantially unnecessary to have a total light transmittance higher than the above range, and the workability in the manufacturing process is also reduced.

The polyester film used in the present invention comprises:
It is also possible to use those whitened by incorporating white inorganic particles into the polyester.

The term "white inorganic particles" refers to inorganic particles which are almost uncolored, and include calcium carbonate, amorphous zeolite particles, anatase type titanium dioxide, calcium phosphate, calcium sulfate, barium sulfate, silica, alumina, kaolin,
Talc, clay and the like are used. In addition to such inorganic particles, fine particles precipitated by a reaction between a catalyst residue and a phosphorus compound in a polyester polymerization reaction system can also be used.

When such a whitened polyester film is used, the apparent specific gravity of the whitened polyester film is preferably 1.34 or more and 1.9 or less, more preferably 1.40 or more and 1.7 or less. If the apparent specific gravity is higher than the above range, mechanical properties, workability, and handleability are deteriorated, which is not preferable.

It is also possible to use a film in which fine bubbles are contained in the film, and the bubbles are whitened by scattering light. The formation of these fine bubbles is caused by the incompatibility of polymers such as poly-3-methylbutene-1, poly-4 in the film matrix, such as polyester.
-Methylpentene-1, polypropylene, polyvinyl-
t-Butane, 1,4-trans-poly-2,3-dimethylbutadiene, cellulose triacetate, cellulose tripropionate, polychlorotrifluoroethylene, etc. are finely dispersed, or the above whitening fine particles are added and It is formed by uniaxially or biaxially stretching. Upon stretching, voids (bubbles) are formed around the immiscible polymer particles, which exhibit a light scattering action and are whitened. In addition, since it has fine bubbles, its specific gravity is low, and it also has cushioning properties, so that a clear image can be obtained.

When such a whitened polyester film is used, the apparent specific gravity of the whitened polyester film is preferably 0.4 or more and 1.3 or less, more preferably 0.6 or more and 1.2 or less. . If the apparent specific gravity is lower than the above range, mechanical properties and thermal dimensional stability are inferior, which is not preferable.

In the case where the polyester film is subjected to surface treatment, that is, corona discharge treatment (in air, nitrogen, carbon dioxide gas, etc.) or easy adhesion treatment by the following method, the adhesion to the receiving layer, It is more preferably used because it has improved water resistance and solvent resistance. Various methods can be used for the easy adhesion treatment.Acrylic, urethane, polyester-based adhesives or the like applied in the film manufacturing process, or the film after uniaxial or biaxial stretching as described above. Those coated with various adhesives can be suitably used.

The base film may be a transparent film or a colored film.

The thickness of this substrate is not particularly limited, but is usually preferably 10 μm or more and 500 μm or less, more preferably 20 μm or more and 300 μm or less, and further preferably 3 μm.
It is desirable that the thickness be 0 μm or more and 250 μm or less.

The receiving layer in the present invention has an average molecular weight of 100.
It is a film containing, as a main component, a crosslinked polyalkylene oxide obtained by reacting 0 to 1 million polyalkylene oxide with an isocyanate compound.

The polyalkylene oxide in the present invention preferably has a weight average molecular weight of 1,000 to 1,000,000, and examples thereof include polyethylene oxide, polypropylene oxide, polybutylene oxide, and copolymers of these monomers, and these. A mixture or the like can be used. Furthermore, among them, the weight average molecular weight is 2
Those of 000 to 100,000 are preferable. Weight average molecular weight is 1
If it is less than 000, the ink absorbency is lowered, which is not preferable. Further, if the weight average molecular weight exceeds 1,000,000, the crosslinking density of the crosslinked polyalkylene oxide obtained will be low, and the strength of the recording layer will be reduced, such being undesirable.

The isocyanate compound in the present invention is one having one or more isocyanate groups, and examples thereof include n-propyl isocyanate and n-propyl isocyanate.
Butyl isocyanate, n-hexyl isocyanate,
Dodecyl isocyanate, cyclohexyl isocyanate, benzyl isocyanate, phenyl isocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, 1,8-dimethylbenzol 2,4-diisocyanate, 2,4-tolylene diisocyanate, polymethylene polyphenyl isocyanate, tri At least one selected from the group consisting of a urethane isocyanate compound obtained by reacting a polyol such as methylolpropane with a molar number of diisocyanate corresponding to its active hydrogen, and a polyisocyanate adduct is used. Further, among the above-mentioned polyols, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate and 2,4-tolylene diisocyanate are preferably used.

The amount of the isocyanate compound used varies depending on the type of isocyanate compound and the reaction conditions and is not particularly limited, but is preferably 1 to 80 parts by weight, more preferably 5 to 50 parts by weight, based on 100 parts by weight of the polyalkylene oxide. Selected from a range of departments. If the amount is less than 1 part by weight, the crosslink density of the crosslinked polyalkylene oxide obtained will be low and the strength of the recording layer will be reduced, such being undesirable. Further, if it exceeds 80 parts by weight, the meltability deteriorates,
It is not preferable because it is difficult to form a uniform layer.

The method of reacting the polyalkylene oxide with the isocyanate compound is not particularly limited, but it is a method of reacting in the form of a solution, a method of reacting in the form of a dispersion, or after uniformly mixing the two in a powder or solid form, the mixture is heated to a predetermined temperature. A method such as heating to cause a crosslinking reaction can be used. The reaction temperature is usually 50 to 150 ° C.

The receiving layer in the present invention is a film containing a crosslinked polyalkylene oxide resin as a main component. It is a film containing a crosslinked polyalkylene oxide resin having a melt index of 0.5 to 100, preferably 1 to 50 as a main component. When the melt index is lower than the above range, the load on the extruder is excessively large and the thickness unevenness of the receiving layer becomes large, which is not preferable. When the melt index is higher than the above range, the viscosity becomes too low, and problems such as breakage and tear of the receiving layer during running occur, which is not preferable.

As the crosslinked polyalkylene oxide resin in the present invention, the resin composition described in JP-A-6-316623 can be effectively used.

In the present invention, examples of the thermoplastic resin having a melting point of 300 ° C. or less, which is blended with the crosslinked polyalkylene oxide, include low density polyethylene, high density polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin and ionomer resin. , Polyester, nylon, ethylene-acrylic acid copolymer resin, ethylene-ethyl acrylate copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene-methacrylic acid copolymer resin, methylpentene, polyacrylonitrile, ethylene-vinyl alcohol copolymer Polymeric resins, polyvinyl butyral, and the like are used, but not limited to these. Among them, ethylene-
Vinyl acetate copolymer resin, ionomer resin, nylon, polyester, ethylene-vinyl alcohol copolymer resin,
A hydrophilic resin such as polyvinyl butyral is effectively used.

The laminate thickness of the receptor layer is not particularly limited, but is preferably 5 to 200 μm, more preferably 1
0 to 100 μm. When it is thinner than this range, the ink absorbency is poor, and when it is thicker than this range, the strength of the recording layer is lowered and the workability is deteriorated, which is not preferable.

In the present invention, when used as a recording sheet, it is preferable to impart an antistatic function from the viewpoint of adhesion of dust and the like due to static electricity and running properties. In order to impart antistatic properties, it is desirable to provide a receptive layer on one surface of the plastic film and an antistatic layer on the other surface, or to add an antistatic agent to the receptive layer.

The antistatic layer referred to in the present invention includes a coating layer made of an antistatic agent, a resin layer containing an antistatic agent, and a vapor-deposited layer made of a metal or metal oxide. Agent, conductive polymer, conductive carbon fine particles,
Metal or metal oxide fine particles are used.

The surface resistance of the antistatic layer on the side opposite to the receiving layer of the present invention is preferably 10 ⁵ to 10 ¹³ Ω / □.

In the present invention, inorganic / and / or organic particles may be dispersed in the receptive layer or the antistatic layer in order to enhance the recording characteristics. Examples of the inorganic particles that can be used include silica, clay, talc, diatomaceous earth, calcium carbonate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, titanium oxide, and mica. As the organic particles, for example, polymethyl methacrylate, polystyrene, a copolymer thereof, polyvinyl chloride, polyethylene, polypropylene, polyvinylidene chloride, plastic pigments such as polycarbonate can be preferably used, but is not limited thereto. Absent.

In the receiving layer of the recording sheet of the present invention,
Additives such as an antistatic agent, an antioxidant, and an anti-ultraviolet agent may be added to the extent that the effects of the present invention are not impaired.

The method for laminating the receiving layer is an extrusion laminating method. As the extrusion method, a T-die method is generally used after producing pellets. By forming the receptive layer by the extrusion laminating method, environmental deterioration due to evaporation of the solvent and the like is less than in the conventional solution coating method, and a drying oven or the like is unnecessary, which is advantageous in cost.

[0036]

[Evaluation Method of Characteristics] First, a method of evaluating various characteristics in the present invention will be described.

(1) Melt Index (MI) JIS-K7210 Test Condition 4 (190 ° C., 2.16)
0g).

(2) Inkjet recording property Personal computer "98no" manufactured by NEC Corporation
te ”bubble jet printer B manufactured by Canon Inc.
JC-820J was connected, a character pattern was inkjet-recorded, the image quality and the ink absorbability were evaluated, and the recordability was determined as follows. The image quality was evaluated by visual observation using a magnifying glass, and the ink absorptivity was evaluated based on the degree of contamination of the recording layer with ink when the recorded portion was rubbed once with a finger immediately after recording.

Image quality ⊚: Very good (dots are uniform and clear) ○: Good Δ: Slightly inferior ×: Dot flow, repelling, bleeding, etc.

Ink absorbency ⊚: Very good (the recording layer is not soiled at all) ○: Good Δ: Slightly inferior ×: Ink is removed and the recording layer is soiled

(3) Water resistance of recording layer: Water was applied to a cotton swab, and the recording layer was lightly rubbed for evaluation.

⊚: Very good (no loss of recording part even after rubbing 50 times) ○: Good (no loss of recording part after rubbing 30 times) Δ: Slightly inferior (loss of recording part after rubbing 10 to 30 times) X): Poor (falls off less than 10 times)

(4) Total Light Transmittance Integrating sphere light transmitting apparatus (H.K. manufactured by Nippon Seimitsu Kagaku Co., Ltd.)
T. R. Meter SEPH-2) using JIS-K67
It measured according to 14.

(5) Surface resistance value ULTRA HIGH RESISTANCE MET
Using ER (“ADVANTEST” R8340)
20 ° C., 60 ° C. under the conditions of a voltage of 100 V and a Carge of 5 seconds.
% RH was measured.

(6) Specific gravity The film was cut into 100 × 100 mm squares, and a dial gauge (No. 2109-10, manufactured by Mitoyo Seisakusho Co., Ltd.) with a probe (No. 7002) having a diameter of 10 mm was attached at least 10. The thickness of the point is measured, and the average thickness d (μ
m) is calculated. In addition, this film is weighed with a direct balance, and the weight w (g) is read up to the unit of 10 ⁻⁴ g.
At this time, specific gravity = (w / d) × 100.

[0046]

Next, the present invention will be described in more detail with reference to Examples, but it should not be construed that the invention is limited thereto.

Example 1 Polyethylene terephthalate homopolymer chips produced by a conventional method (intrinsic viscosity: 0.62, melting point: 25)
(9 ° C.), a biaxially stretched polyester film having a thickness of 100 μm and a specific gravity of 1.4 was obtained by a conventional method. Corona discharge treatment was performed on the polyester film thus obtained. Next, M. I = 18
The cross-linked polyalkylene oxide of 1 was extrusion laminated at 220 ° C. to a thickness of 40 μm to obtain a recording sheet of the present invention. The properties of the recording sheet thus obtained are as shown in Table 1, and the transparency and recording properties were good, and the water resistance was also excellent, and it was useful as an OHP film.

Example 2 In Example 1, the M. A recording sheet of the present invention was prepared in the same manner except that a thermoplastic resin having a mixing ratio of 70/30 of cross-linked polyalkylene oxide having I = 3.0 and copolymerized nylon (made by Toray Industries, Inc.) having a melting point of 140 ° C. was used. Obtained. The properties of the recording sheet thus obtained are as shown in Table 1, and the transparency and recording properties were good, and the water resistance was also excellent, and they were useful as OHP films.

Example 3 In Example 1, the M. Other than using a thermoplastic resin having a mixing ratio of 65/25/10 of crosslinked polyalkylene oxide having I = 3.0, copolymerized nylon (made by Toray Industries, Inc.) having a melting point of 140 ° C. and polyester resin having a melting point of 220 ° C. In the same manner, a recording sheet of the present invention was obtained. The characteristics of the recording sheet thus obtained are as shown in Table 1,
The transparency and recording properties were good, and the water resistance was excellent, and it was useful as an OHP film.

Example 4 85 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol were subjected to transesterification reaction by a conventional method using 0.09 parts by weight of calcium acetate as a catalyst, and then 0.18% by weight based on the polymer as a phosphorus compound. Ethylene glycol containing 10% by weight of trimethyl phosphate is added so that 40% by weight ethylene glycol slurry is added so that fine particles of calcium carbonate having an average particle size of 1.1 μm are 14% by weight with respect to the polymer, Next, 0.03 part by weight of antimony trioxide was added as a polymerization catalyst to carry out heavy denaturation reaction to obtain polyethylene terephthalate having an intrinsic viscosity of 0.64. The polyethylene terephthalate thus obtained was applied to a thickness of 100 μm by a conventional method.
A biaxially stretched polyester film having m and a specific gravity of 1.38 was obtained. Corona discharge treatment was performed on the polyester film thus obtained. Next, a recording sheet of the present invention was obtained on the surface treated with corona discharge in the same manner as in Example 2. The characteristics of the recording sheet thus obtained are as shown in Table 1,
The recording property was good and the water resistance was also excellent.

Example 5 Polyethylene terephthalate chips and molecular weight 40
After the master chip to which polyethylene glycol of No. 00 was added at the time of polymerization of polyethylene terephthalate was vacuum-dried at 180 ° C., it was mixed so as to be 89% by weight of polyethylene terephthalate, 1% by weight of polyethylene glycol, and 10% by weight of polymethylpentene. 300
Feed to extruder B heated to ° C. Further, after drying polyethylene terephthalate containing 10% by weight of calcium carbonate having an average particle diameter of 1.0 μm as described above,
Feed to extruder A. The polymers extruded from the extruders A and B were laminated so as to have a three-layer configuration of A / B / A, and formed into a sheet from a T die.

Further, an unstretched film obtained by cooling and solidifying this film with a cooling drum having a surface temperature of 25 ° C. is 85 to 95 ° C.
The film was guided to a roll group heated to 1, was stretched 3.4 times in the longitudinal direction, and was cooled by a roll group at 25 ° C. Subsequently, the longitudinally stretched film is subjected to corona discharge treatment, and a water-dispersible polyester copolymer resin (“Pethresin” 604G manufactured by Takamatsu Yushi Co., Ltd.) in which acrylic resin is grafted on the corona discharge treated surface.
Add water to dilute and crosslink the binder (Sanwa Chemical Co., Ltd.)
4 parts by weight of "Nikarac" MW12LF manufactured by Nikarac Co., Ltd.) was added to 100 parts by weight of resin solid content, and silica sol having an average particle size of 0.10 μm ("Cataroid" manufactured by Catalyst Kasei Kogyo Co., Ltd.) was used as a lubricant. After adding 0.5 parts by weight to 100 parts by weight and applying a coating agent having a concentration of 3.0% by weight by a metalling bar method, the coating layer is dried at 125 ° C. in a lateral direction at 3 ° C. Stretched 6 times and then 225
After heat treatment at ℃ and uniform cooling, cool down to room temperature and wind it up.
A white film having m and a specific gravity of 1.0 was obtained. The laminated structure of the film was 5/90/5 μm. A recording sheet of the present invention was obtained in the same manner as in Example 2 on the side of the hydrophilic group-containing polyester undercoat layer onto which the acrylic film of the polyester film thus obtained was grafted. The properties of the recording sheet thus obtained are as shown in Table 1, and the recording properties were good and the water resistance was also excellent.

Example 6 Polyethylene 2,6-naphthalate homopolymer chip produced by a conventional method (intrinsic viscosity [η] = 0.7)
After sufficiently dried in a vacuum, fed to an extruder, melt-extruded at 295 ° C., filtered through a 10 μm-cut metal sintering filter, extruded into a sheet shape from a T-shaped die, and cooled to a cooling drum having a surface temperature of 50 ° C. It was cooled and solidified. In order to improve the adhesion between the sheet and the surface of the cooling drum during this time, a wire electrode was arranged on the sheet side, and a DC voltage of 6000 V was applied. The unstretched polyethylene 2,6-naphthalate film thus obtained was stretched 4.5 times in the longitudinal direction with a group of rolls heated to 120 ° C, and cooled to 25 ° C to obtain a uniaxially stretched film. Further, the stretched film was guided to a tenter, stretched 4.3 times in the width direction in an atmosphere maintained at 125 ° C., heat-set at 225 ° C., and a thickness of 7 mm.
A biaxially stretched film having a thickness of 5 μm and a specific gravity of 1.35 was obtained. The film thus obtained was subjected to corona discharge treatment, and a recording sheet of the present invention was obtained on the treated surface in the same manner as in Example 2. The properties of the recording sheet thus obtained are as shown in Table 1, and the transparency and recording properties are good, and the water resistance is excellent.
It was useful as a P film.

Further, it was found that the substrate was excellent in heat resistance because a biaxially stretched polyethylene 2,6-naphthalate film was used as the substrate.

Example 7 Polyethylene 2,6-naphthalate (Intrinsic viscosity [η] =
0.7), 94% by weight of poly-4-methylpentene-1
(Mitsui Petrochemical Co., Ltd. TPX-D820) 5% by weight, molecular weight 4000 polyethylene glycol 1% by weight
Is supplied to the extruder A at a ratio of
It was melted at 295 ° C. by a conventional method and introduced into the center of the T-die three-layer die.

On the other hand, 86% by weight of polyethylene 2,6-naphthalate was added to calcium carbonate (average particle size 0.8 μm).
The raw material added with 14% by weight of m) was supplied to the extruder B, melted at 295 ° C. by a conventional method and laminated on both surface layers of the T-die three-layer die, and the melt sheet was kept at a surface temperature of 25 ° C. On the cooling drum, it was contact-cooled and solidified by the electrostatic charge method. Subsequently, the cast sheet is longitudinally heated at 120 ° C. in a conventional manner.
Stretched 3.5 times using a roll group heated to 25
Cooled to ° C. Further, the stretched film was introduced into a tenter, stretched 3.2 times in the width direction in an atmosphere heated to 125 ° C., and heat-set at 225 ° C. to obtain a biaxially stretched film having a thickness of 100 μm and a specific gravity of 1.0. Obtained. The thickness of each film layer was such that the surface layer was 6 μm and the central layer was 88 μm.

The film thus obtained was subjected to corona discharge treatment, and a recording sheet of the present invention was obtained on the treated surface in the same manner as in Example 2. The properties of the recording sheet thus obtained were as shown in Table 1, and the recording sheet was excellent and the water resistance was excellent.

Further, it was found that the substrate was excellent in heat resistance because a biaxially stretched polyethylene 2,6-naphthalate film was used as the substrate.

[0059]

[Table 1]

[0060]

INDUSTRIAL APPLICABILITY The recording sheet of the present invention is very excellent in ink absorbency, image quality and water resistance, and is a recording sheet for monochrome and color ink jet printers, thermal ink receptor including sublimation type, fabric ink receptor. It can be preferably used in a body, a carbon ink receptor, and applications such as offset printing and flexographic printing. Further, the transparent recording layer can be applied to OHP applications.

Further, by laminating a transparent plastic film on the printed surface of the printed recording sheet, the water resistance is further improved, so that it can be effectively used for posters outdoors.

Claims (7)

[Claims] 1. A recording sheet comprising a plastic film and a receptive layer formed by extrusion lamination, wherein the receptive layer has an average molecular weight of 1000 to 100.
The melt index obtained by reacting a polyalkylene oxide with an isocyanate compound is 0.5 to 10
A recording sheet comprising a crosslinked polyalkylene oxide of 0 as a main component. 2. The melt index obtained by reacting a polyalkylene oxide having an average molecular weight of 1,000 to 1,000,000 with an isocyanate compound in the receptor layer has a melt index of 0.5 to 100.
A recording sheet comprising, as a main component, the cross-linked polyalkylene oxide and a thermoplastic resin having a melting point of 300 ° C. or lower. 3. The recording sheet according to claim 1, wherein the total light transmittance of the recording sheet is 70% or more. 4. The recording sheet according to claim 1, wherein the plastic film is a polyester film. 5. The plastic film is a white polyester film, wherein the plastic film is a white polyester film.
Recording sheet according to any one of. 6. The recording sheet according to claim 1, wherein the plastic film has a recording layer on one side and an antistatic layer on the other side. 7. The method according to claim 1, wherein the plastic film is polyethylene 2,6-naphthalate.
~ The recording sheet according to claim 6.