JP2001232738A - White polyester film for recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a white polyester film for recording which is used to form an image on the surface by various recording methods. SOLUTION: The base material is constituted of a white polyester film having at least one layer consisting of a polyester-based resin composition containing 6-40 wt.% particles. A recording layer containing at least one of resin selected from polyester resins, urethane resins, acryic resins and polyester urethane resins is provided on at least one side of the base material. The surface electric resistance of the recording layer is <=13 (logΩ/(square)).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording white polyester film for forming an image on a surface by various recording methods.

[0002]

2. Description of the Related Art A recording white polyester film used for an image receiving sheet or a magnetic card is disclosed in
Japanese Patent No. 204941 is known, but a conventional film is a single-layer film in which polyester and particles are combined, a core layer composed of polyester and particles, and a skin composed of particles having a smaller content than polyester and core layers. These films are composed of a laminate with a layer, and these have a problem that the film surface has insufficient adhesion to an adhesive or ink, or has a problem in workability or printability due to surface charging.

[0003]

DISCLOSURE OF THE INVENTION The present invention is excellent in concealing properties, whiteness, and stability thereof, and is excellent in adhesion to an adhesive or ink on the surface, and further, the surface is prevented from being charged. An object of the present invention is to provide a white polyester film for recording which is excellent in processability and printability.

[0004]

According to the present invention, there is provided a white polyester film having at least one layer made of a polyester resin composition containing particles in an amount of 6% by weight to 40% by weight. At least one surface has a recording layer containing at least one resin selected from a polyester resin, a urethane resin, an acrylic resin, and a polyester urethane resin, and the surface electric resistance of the recording layer is 13 (logΩ / □). A) A recording white polyester film characterized by the following.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a polyester resin forming a white polyester film as a substrate is
It is mainly composed of polyester and particles. As the polyester, terephthalic acid, isophthalic acid,
Aromatic dicarboxylic acids such as naphthalenedicarboxylic acid,
Or, a polyester produced by polycondensing an ester thereof with a glycol such as ethylene glycol, diethylene glycol, 1,4-butanediol, or neopentyl glycol is exemplified. Typical examples of the polyester include polyethylene terephthalate, polyethylene butylene terephthalate and polyethylene-2,6.
-Naphthalate and the like. These polyesters may be homopolymers or copolymers of third components other than those described above. Preferably, ethylene terephthalate unit, butylene terephthalate unit,
Alternatively, at least one unit selected from ethylene 2,6-naphthalate units is 70 mol% or more, more preferably 80 mol% or more, and particularly preferably 90 mol%.
The above polyester is preferred. Further, the polyester may be a mixture of two or more polyesters.

The method for producing the polyester is not particularly limited, and includes a method of directly reacting an aromatic dicarboxylic acid and a glycol, and a method of subjecting an alkyl ester of an aromatic dicarboxylic acid to a transesterification reaction with a glycol followed by polycondensation. Or by a method of polycondensing a diglycol ester of an aromatic dicarboxylic acid.

In the present invention, the particles constituting the polyester resin forming the white polyester film as the base material are blended in order to improve the concealability and the like of the white polyester film for recording of the present invention. The type of the particles is not particularly limited as long as the action of the present invention is not impaired, and may be either inorganic particles or organic particles, or both. Examples of the inorganic particles include silica, kaolinite, talc, calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide, titanium oxide, zinc sulfide, and the like. Examples of the organic particles include an organic white pigment, polyethylene, polypropylene, an acrylic resin, and a benzoguanamine-based resin. Preferably, titanium oxide fine particles and / or zinc sulfide fine particles are used. Particularly preferred are titanium oxide fine particles from the viewpoint of imparting concealing properties to the film and improving film image forming properties. The titanium oxide fine particles may be either anatase type or rutile type. The particle surface may be subjected to an inorganic treatment such as alumina or silica, or may be subjected to a silicon-based or alcohol-based organic treatment. The use of calcium carbonate particles or barium sulfate particles is also preferable because the color tone (b value) of the film tends to be low.

In the present invention, the content of the above particles in the polyester resin forming the white polyester film serving as the base material must be 6% by weight or more and 40% by weight or less. When the content of the particles is less than 6% by weight, the concealing property is reduced, and when the white polyester film for recording of the present invention is used as a base material of an IC card, the IC chip becomes easily visible, The sharpness of the image formed on the polyester film decreases. Also 4
If it exceeds 0% by weight, the stretchability of the white polyester film for recording of the present invention is lowered. The compounding amount of the particles in the polyester resin is preferably 10% by weight or more and 37% by weight or less, and more preferably 15% by weight or more and 35% by weight or less.

In the present invention, preferably, the base material is
At least one surface of the layer (A) composed of the polyester resin composition containing the particles in an amount of 6% by weight or more and 35% by weight or less,
A multilayer structure having a layer (B) made of a polyester resin composition containing 1% by weight or more and 40% by weight or less of particles is preferable. By having a multilayer structure, both the concealing property and the stretchability during film production of the white polyester film for recording of the present invention are improved.

When the content of the particles in the polyester resin constituting the layer (A) is less than 6% by weight, the concealing property is reduced, and the white polyester film for recording of the present invention is used as a base material of an IC card. In this case, the IC chip becomes easily visible, and the sharpness of the image formed on the white polyester film for recording of the present invention is reduced. If the content exceeds 35% by weight, the stretchability of the recording white polyester film of the present invention is reduced.

When the content of the particles in the polyester resin constituting the layer (B) is less than 1% by weight, the concealing property is reduced, and the white polyester film for recording of the present invention is used as a base material of an IC card. In this case, the IC chip becomes easily visible, and the sharpness of the image formed on the white polyester film for recording of the present invention is reduced. Further, when a recycled resin or the like is used in the resin composition constituting the layer (A), the whiteness of the recording white polyester film of the present invention and the concealability are not stable, and the appearance tends to be poor. On the other hand, if it exceeds 40% by weight, the stretchability of the recording white polyester film of the present invention is reduced, or the surface roughness of the film surface is increased, and the sharpness of the formed image is reduced.

Further, when the substrate has a multilayer structure as described above, the content of the particles in the polyester resin constituting the layer (A) is preferably 5% by weight or more and 35% by weight or less, more preferably. It is preferably from 10% by weight to 30% by weight. Similarly, the content of the particles in the polyester resin constituting the layer (B) is preferably from 12% by weight to 40% by weight, more preferably from 15% by weight to 4% by weight.
The content is preferably 0% by weight or less.

In the present invention, the thickness of the white polyester film as the base material is not particularly limited, but is preferably 5
The thickness is preferably from 1000 to 1000 m, more preferably from 50 to 250 m. Thickness is less than 5μm or 1000μ
If it exceeds m, the film formability at the time of producing a white polyester film as a base material tends to decrease. In addition, when the white polyester film serving as the base material of the present invention has a multilayer structure, the thickness ratio of each layer is not particularly limited.

In the present invention, additives such as an adhesive, a light stabilizer, and a fluorescent agent can be added to the resin composition constituting the white polyester film serving as the base material, if necessary. When the white polyester film serving as the base material of the present invention has a multilayer structure, the above-mentioned additives can be blended into only some or all of the layers.

The recording-use white polyester film of the present invention comprises a polyester-based resin, a urethane-based resin,
It has a recording layer containing at least one resin selected from an acrylic resin and a polyester urethane resin.
By having a recording layer, wettability and adhesion to ink, a coating agent, and the like can be improved. The recording layer is preferably provided on both sides of the substrate so that an image can be formed on both sides of the film.

The recording layer is formed of at least one resin selected from polyester resins, urethane resins, acrylic resins, and polyester urethane resins. Preferably, it contains a polyester-based resin, and is used by mixing a polyester-based resin with a resin having an action of improving the adhesiveness of a normal polyester film, such as a urethane-based resin, an acrylic-based resin, and a polyester-urethane resin. May be.

As the polyester resin, a water-insoluble polyester copolymer obtained by reacting a mixed dicarboxylic acid of a dicarboxylic acid containing a sulfonic acid metal base and a dicarboxylic acid containing no sulfonic acid metal base with a polyol component is used. Coalescence is preferred. More preferably, 0.5 to 15 mol% of a dicarboxylic acid containing a metal sulfonate group and 85 to 9 mol% of a dicarboxylic acid containing no metal sulfonate group.
A water-insoluble polyester copolymer obtained by reacting a mixed dicarboxylic acid with 9.5 mol% with a polyol component is preferred.

Examples of the above-mentioned dicarboxylic acid containing a sulfonic acid metal base include 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid,
Metal salts such as 5 [4-sulfophenoxy] isophthalic acid are exemplified, and particularly preferred is 5-sodium sulfoisophthalic acid and / or sodium sulfoterephthalic acid. These sulfonic acid metal base-containing dicarboxylic acid components are preferably 0.5 to 15 mol%, more preferably 2.0 to 1 mol%, based on all dicarboxylic acid components.
It is preferably 0 mol%. If the sulfonic acid metal base-containing dicarboxylic acid component exceeds 15 mol%, the dispersibility of the polyester copolymer in water is improved, but the water resistance of the polyester copolymer is liable to be significantly reduced. 0.5 mol%
If it is less than 1, the dispersibility in water tends to be remarkably reduced. The dispersibility of the polyester copolymer in water varies depending on the type and the mixing ratio of the copolymer components, but the content of the sulfonic acid metal base-containing dicarboxylic acid is preferably small as long as the dispersibility in water is not impaired. .

The dicarboxylic acid containing no sulfonic acid metal base may be any of aromatic dicarboxylic acid, alicyclic dicarboxylic acid and aliphatic dicarboxylic acid.
Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, orthophthalic acid, and 2,6-naphthalenedicarboxylic acid. The aromatic dicarboxylic acid containing no sulfonic acid metal base is preferably at least 40 mol% of the dicarboxylic acid component. When the content of the aromatic dicarboxylic acid as described above is less than 40 mol%, the mechanical strength and the water resistance of the polyester copolymer are likely to decrease. Aliphatic dicarboxylic acids, and alicyclic dicarboxylic acids,
Examples include succinic acid, adipic acid, sebacic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid. When these non-aromatic dicarboxylic acid components are added, the adhesive performance is enhanced. However, when the content is too large, the mechanical strength and water resistance of the polyester copolymer generally tend to decrease.

Examples of the polyol component to be reacted with the mixed dicarboxylic acid include aliphatic glycols having 2 to 8 carbon atoms and / or alicyclic glycols having 6 to 12 carbon atoms. Specifically, ethylene glycol, 1,2
-Propylene glycol, 1,3-propanediol,
1,4-butanediol, neopentyl glycol,
1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol,
1,4-cyclohexanedimethanol, P-xylylene glycol, diethylene glycol, triethylene glycol and the like can be mentioned. Examples of the polyether include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Also, P
-An oxycarboxylic acid component such as oxyethoxybenzoic acid may be copolymerized.

As the urethane-based resin, a heat-reactive water-soluble urethane in which a terminal isocyanate group is blocked by a hydrophilic group is preferable. As the blocking agent for the isocyanate group, bisulfites, and phenols containing a sulfone group, alcohols, lactams, oximes,
And active methylene compounds. The blocked isocyanate group renders the urethane prepolymer hydrophilic or water-soluble, and the blocking agent can be removed by drying or heat setting during film production. When thermal energy is applied to the urethane-based resin containing the blocked isocyanate group, the blocking agent separates from the isocyanate group, and the urethane-based resin self-crosslinks. At the time of forming the recording layer, for example, when the components are a coating liquid as described below, at the time of adjusting the coating liquid, a urethane-based resin containing a block-type isocyanate group,
When the thermal reaction is completed by coating, drying, and heat setting, the hydrophilic group is removed, and a coating film having good water resistance is obtained. Among the above blocking agents, bisulfites are preferred from the viewpoints of heat treatment temperature and heat treatment time, versatility and the like.

The chemical composition of the urethane prepolymer used for the urethane resin containing a blocked isocyanate group as described above is as follows: (1) a compound having two or more active hydrogen atoms in the molecule and having a molecular weight of 200; ~ 20,000
0, (2) an organic polyisocyanate having two or more isocyanate groups in the molecule, and (3) a terminal isocyanate group obtained by reacting a chain extender having at least two active hydrogen atoms in the molecule. A compound having the following formula:

The compound (1) is generally known to contain two or more hydroxyl groups, amino groups or mercapto groups at the terminal or in the molecule. Particularly preferred compounds are polyethers. Examples include polyols, polyester polyols, and polyetherester polyols. Examples of the polyether polyol include, for example, alkylene oxides such as ethylene oxide and propylene oxide, or compounds obtained by polymerizing styrene oxide and epichlorohydrin, and random copolymerization, block copolymerization, or non-polymerization of polyhydric alcohols. And the like. Polyester polyols and polyetherester polyols mainly include linear or branched compounds, for example, succinic acid, adipic acid, phthalic acid, or their acid anhydrides and the like, ethylene glycol, diethylene glycol, Saturated and unsaturated alcohols such as 1,4-butanediol, neopentyl glycol, 1,6-hexanediol and trimethylolpropane; polyalkylene ether glycols such as relatively low molecular weight polyethylene glycol and polypropylene glycol;
And those obtained by condensation with a mixture thereof. Examples of the polyester polyol include polyesters obtained from a lactone and a hydroxy acid, and examples of the polyether ester polyol include polyether esters obtained by disabling ethylene oxide or propylene oxide from polyesters produced in advance.

As the organic polyisocyanate (2), isomers of toluylene diisocyanate, 4,4
Aromatic diisocyanates such as diphenylmethane diisocyanate, aromatic aliphatic diisocyanates such as xylylene diisocyanate, alicyclic diisocyanates such as isophorone diisocyanate and 4,4-dicyclohexylmethane isocyanate, hexamethylene diisocyanate, and 2, Aliphatic diisocyanates such as 2,4-trimethylhexamethylene diisocyanate,
Alternatively, polyisocyanates in which one or more of these compounds are added in advance to trimethylolpropane or the like may be used.

In the compound of the above (3), examples of the chain extender having at least two active hydrogens include glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol and 1,6-hexanediol, and glycerin. Polyhydric alcohols such as trimethylolpropane and pentaerythritol; diamines such as ethylenediamine, hexamethylenediamine and piperazine; aminoalcohols such as monoethanolamine and diethanolamine; thiodiglycols such as thiodiethylene glycol; and water. No.

The acrylic resin is obtained by polymerizing a monomer of acrylic acid or a derivative thereof, and optionally contains a monomer component other than acrylic acid having a vinyl group and / or a derivative thereof. It may be. Examples of the monomer used include acrylic acid, metal acrylic acid (hereinafter, acrylic acid and / or methacrylic acid are referred to as (meth) acrylic acid), and lower alkyl esters of (meth) acrylic acid (eg, methyl, ethyl, propyl Butyl, amyl, hexyl, heptyl, octyl, 2-ethylhexyl ester), methyl methacrylate, hydroxymethyl acrylate, styrene, glycidyl methacrylate, methyl acrylate, ethyl acrylate and the like.

The above-mentioned polyester resin, urethane resin, acrylic resin and polyester urethane resin may be used as a mixture of two or more resins.

The above polyester resin, urethane resin, acrylic resin and polyester urethane resin include:
It is also possible to appropriately add a catalyst compound having a reaction-accelerated curing of each crosslinking agent or curing agent, and various known techniques can be used for this purpose. The self-crosslinkable resin can be selected from resins usable as a crosslinking agent or a curing agent such as the urethane resin and the melamine resin, and particularly, a water-soluble and / or water-dispersible methylolmelamine resin. And urea-formalin resin, and resins such as polyether, polyester, polyether urethane, and polyetherester to which polyfunctional blocked isocyanate groups are added. If necessary, a curing catalyst can be used.

In the present invention, at least the recording layer needs to have a surface electric resistance of 13 (log Ω / □) or less. Even when the recording layer is not provided on both sides of the film, the surface electric resistance value on both sides of the film is preferably 13 (logΩ / □) or less.

In the present invention, the surface electric resistance value is 13
(LogΩ / □) The method for adjusting the content to be not more than (logΩ / □) is not particularly limited. For example, as a method for adjusting the surface of the recording layer to the above range, a method of including an antistatic agent in a component constituting the recording layer is exemplified. The type of antistatic agent is not particularly limited,
It is preferable that the contact angle between the recording layer and water be 45 degrees or more. Examples of such an antistatic agent include, for example, a sorbitan type, an ether type, an ester type, a sorbitol type, a glucose type nonionic type, a quaternary ammonium salt type, a quaternary ammonium resin type, an imidazoline type and an arcobell type having a functional group of Surfactants of cationic type such as thiol, solomin A type, anionic type such as alkyl sulfate type, alkyl phosphate type, phosphate ester type and sulfate ester type, and amphoteric type such as petaine type, amino acid type and amino sulfate type An agent type or a polymer type may be used. Preferably, a cationic antistatic agent is preferred from the viewpoint of humidity dependency. Among them, an ethosulfate salt of a quaternary ammonium cation is particularly preferred.

When the surface electric resistance is controlled by the antistatic agent, the amount of the antistatic agent to be added to the resin such as polyester resin, urethane resin and acrylic resin constituting the recording layer is preferably 1 to 20% by weight. %, More preferably 5 to 10% by weight. If the proportion of the antistatic agent is less than 1% by weight, it is difficult to obtain the effect of adding the antistatic agent. Conversely, if it exceeds 20% by weight, the offset printability with respect to the recording layer deteriorates, and And the stability with time of the coating liquid and the like over time are easily reduced.

When the recording layer is not provided on both sides of the film,
The surface electric resistance value of both sides of the film is 13 (logΩ / □)
Also in the case of the following, the above-mentioned surface electric resistance is formed by forming an antistatic layer on the surface of the substrate having no recording layer, for example, by mixing the above antistatic agent with a resin or the like as necessary. It can be a resistance value.

In the present invention, it is possible to add additives to the components constituting the recording layer, if necessary.
Moreover, you may mix | blend the particle mix | blended with the said base material.

The method for producing the white polyester film of the present invention is not particularly limited, and for example, it can be produced by the following production method. In the present invention, the production of the unstretched film for forming the base material can be performed by using a general method of forming a film such as an extrusion method using a T-die. When the base material has a multilayer structure, a co-extrusion method in which the resin composition constituting each layer is supplied to a separate extruder and then laminated in a molten state and extruded from the same die is preferable, but each layer is formed separately. Then, a method of laminating may be used.

The unstretched film obtained as described above is
Further, it is preferable to perform a stretching treatment in a uniaxial direction or a biaxial direction. As a stretching treatment method, stretching between rolls having a speed difference (roll stretching), stretching by gripping and expanding with clips (tenter stretching), or stretching by air pressure (inflation stretching) is used. Is mentioned.

The stretching process is specifically as follows. First, a first-stage longitudinal stretching step is performed. In the longitudinal stretching, stretching is performed between two or many rolls having different peripheral speeds.
The heating means at this time may be a method using a heating roll, a method using a non-contact heating method, or a combination thereof. Among these, the most preferred stretching method is a method in which roll heating and non-contact heating are used in combination.

In the case of stretching in the biaxial direction, for example, the uniaxially stretched film obtained as described above is introduced into a tenter and stretched 2.5 to 5 times in the width direction. The preferred stretching temperature at this time is 100 ° C to 200 ° C.

Further, the biaxially stretched film obtained as described above is optionally subjected to a heat treatment. The heat treatment is preferably performed in a tenter, and the melting point Tm-
It is preferable to carry out in the range of 50 ° C. to Tm. Further, by performing the heat treatment while relaxing in the longitudinal and transverse directions, a film having a low heat shrinkage can be obtained.

The method for forming the recording layer in the present invention is not particularly limited. For example, the components constituting the recording layer as described above may be mixed simultaneously or sequentially using a solvent or the like, if necessary. Adjust the coating solution, gravure coating method,
Coating on a substrate by a commonly used method such as a kiss coat method, a reverse roll coat method, a curtain coat method, a bar coat method, an air doctor coat method, an air knife coat method, a blade coat method, a dip method, a spray coat method, etc. And a method of removing the solvent by drying or the like.

When the recording layer is formed by the above-mentioned coating method, the coating amount (wet state) of the coating liquid is preferably about 5 to 50 g per 1 m ² of the white polyester film substrate.

In the production process of the recording white polyester film of the present invention, when forming the recording layer by the coating method as described above, the timing of the coating is before the film is stretched, after uniaxial stretching (longitudinal stretching), and after the orientation treatment. It may be any one such as after the end. To increase the adhesion between the substrate and the recording layer,
After the uniaxial stretching of the base material, it is preferable to adopt an in-line coating method in which a coating solution is applied on at least one surface and then further stretched in a direction perpendicular to the uniaxial stretching direction.

The recording white polyester film of the present invention may have another layer such as an undercoat layer or an adhesive layer as long as the function of the present invention is not impaired.

The color b value of the white polyester film for recording of the present invention is preferably -1.0 or less, more preferably -2.0 or less, and further preferably -3.0 or less. When the color b value exceeds -1.0, the white polyester film for recording becomes yellow, and the appearance is deteriorated.

The recording white polyester film of the present invention has a total light transmittance of preferably 10% or less, more preferably 8% or less, and further preferably 5% or less. When the total light transmittance exceeds 10%, the hiding power of the background of the image is reduced when an image is formed on the white polyester film for recording of the present invention. The method for setting the total light transmittance in the above range is not particularly limited, but as described above, the substrate,
Further, there may be mentioned a method in which particles are contained in the components of the recording layer, if necessary. Further, a dye may be contained. When a dye is contained, the content is preferably 1000 ppm or less. When the substrate has a multilayer structure such as the layer (B) -layer (A) -layer (B) as described above, it is preferable that the dye is contained in a central layer such as the layer (A). .

The recording white polyester film of the present invention has a heat shrinkage at 150 ° C. of preferably 1.0% or less, more preferably 0.8% or less, and further preferably 0.5% or less. . When the heat shrinkage at 150 ° C. exceeds 1.0%, the workability in post-processing the recording white polyester film of the present invention decreases.

The recording white polyester film of the present invention preferably has an apparent density of 1.5 g / cm ³ or more which does not substantially contain voids inside. If the apparent density is less than 1.5 g / cm ³ , that is, if there is a cavity in the film, wrinkles are likely to occur.

In the present invention, "for recording" means that an image can be formed by attaching a recording material such as ink to a recording layer using an image forming apparatus or a writing instrument such as a pen or a pencil.

The white polyester film for recording of the present invention includes labels, bar code labels, posters, calendars, cards, magnetic cards, recording paper, dust-free paper, packaging materials, maps, white boards, electronic white plates, building materials, wallpapers, and cosmetics. Can be used for paper, decorative board, slip, delivery slip, electrical insulating material, display reflector, parabolic antenna reflector, display board, photographic paper, release paper, clinical test paper, etc., intaglio printing, letterpress printing, stencil printing Printing paper such as printing and lithographic printing, laser beam printer paper, inkjet printer paper, sublimation transfer recording paper, thermal transfer recording paper, electrophotographic recording paper,
It is suitable for uses such as copy paper, LBP recording paper, form printing paper, offset printing paper, gravure printing paper, screen printing paper, magnetic card base material, and IC card base material.

The recording white polyester film of the present invention is particularly suitable for sublimation transfer recording, thermal transfer recording, ink jet recording, electrophotographic recording, intaglio printing, letterpress printing, stencil printing, lithographic printing. It is suitable for image formation by a recording method.

Hereinafter, the present invention will be described in more detail with reference to Test Examples and Examples, but the present invention is not limited thereto. Test example Test method (1) Apparent density of film The films of Examples 1 to 3 and Comparative Examples 1 and 2 were 10 cm x 1
Cut out exactly to a 0cm square to make a test sample,
The thickness is measured at 50 points to determine an average thickness t (unit: μm). Next, the weight of the test sample is measured up to 0.1 mg, and defined as w (g). Then, the apparent density was calculated by the following equation 1. Apparent density (g / cm ³ ) = (w / t) × 100 Formula 1

(2) Color Tone of Film For the films of Examples 1 to 3 and Comparative Examples 1 and 2, the b value of reflection on both sides was measured using a color difference meter (Z-1001DP, manufactured by Nippon Denshoku Industries Co., Ltd.). I asked.

(3) Printability of Recording Layer The surface of the recording layer of each of the films of Examples 1 to 3 and Comparative Examples 1 and 2 (Comparative Example 1 had a film surface) was coated with an ultraviolet curable ink (Best Cure 161 (Indigo) (yellow) ), Manufactured by TOKA Corporation)
, And subjected to an ultraviolet irradiation treatment with an irradiation energy of 500 mJ by a UV exposure apparatus (manufactured by Toshiba Electric Materials Co., Ltd.) to form an image. The obtained image was visually evaluated based on the following criteria. The evaluation was performed for both the chill roll surface (front) and the anti-chill roll surface (back). [Evaluation Criteria] Image is clear: ○ Image is slightly unclear: Δ Image is unclear: ×

(4) Surface Electric Resistance Value of Film The films of Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to JI
According to SK-6911, the surface electric resistance was measured at 23 ° C. and 65 RH% using Hiresta IP (manufactured by Mitsubishi Yuka Co., Ltd.). The measurement was performed on the chill roll surface (table),
The test was performed on both the anti-chill roll side (back side).

(5) Ink Transfer to Recording Layer As a printing press, a sheet-fed offset printing press (Ryobi 33)
02M, manufactured by Ryobi Co., Ltd.) and the recording layer surface of the films of Examples 1 to 3 and Comparative Examples 1 and 2 using "Best Cure 161 (Indigo), (Red), (manufactured by TOKA Corporation)" as the ink. (Comparative example 1 was printed on the film surface). The first color (indigo) is printed on the second color (red), and the second color (red) is printed.
Was evaluated based on the following criteria. The evaluation was performed for both the chill roll surface (front) and the anti-chill roll surface (back). [Evaluation Criteria] Good transferability (the ink is uniformly transferred without unevenness): Poor transferability (there is uneven transfer of the ink, the density is thin and uneven): ×

(6) Ink Adhesion to Recording Layer On the recording layer surface of the films of Examples 1 to 3 and Comparative Examples 1 and 2 (Comparative Example 1 was the film surface), "Ryo" was used as a printing machine.
bi 3302M "and" P
OP-VIP (black), (red) "(Dainippon Ink Co., Ltd.)
) And air-dried for one day to form an image.
Similarly, as a UV curable ink, "Best Cure 161"
(Indigo), (Red), (manufactured by TOKA CORPORATION) ", UV irradiation was performed with a UV exposure device at an irradiation energy of 500 mJ, and the UV ink was cured to form an image. Next, a 2 mm 1
A cross-cut surface of 00 cells was inserted, and an adhesive tape (Cellotape, manufactured by Nichiban Co., 25 mm width) was stuck thereon so that air bubbles did not enter the adhesive surface, and the surface was further rubbed to be sufficiently adhered. On the image forming surface side of the film, hold both ends of the adhesive tape before and after in the longitudinal direction, where the adhesive tape is not adhered, by hand, and quickly peel the adhesive tape in a peeling direction at an angle of 90 degrees with the film surface, and peel. After observing the image surface afterward, the adhesion was evaluated based on the following criteria from the ink residual ratio. The evaluation was performed for both the chill roll surface (front) and the anti-chill roll surface (back). [Evaluation Criteria] Residual rate 100%: 全 く (no problem at all) Residual rate 90% or more and less than 100%: 出来 る (can be used without practical problems) Residual rate 70% or more and less than 90%: △ (adhesion is slightly weak, (A problem may occur in practical use.) Residual rate 50% or more and less than 70%: × (There is a problem in adhesion)

(7) Thermal Shrinkage of Film The films of Examples 1 to 3 and Comparative Examples 1 and 2 were cut into a length of 150 mm and a width of 10 mm, and 100 m in the longitudinal direction (longitudinal direction).
The m width was marked, left at 150 ° C. for 30 minutes under no tension, and the change rate of the marked portion was measured in both the vertical and horizontal directions.

(8) Runnability of Film For the films of Examples 1 to 3 and Comparative Examples 1 and 2, a sheet-fed offset printing machine “Ryobi 3302M” was used.
The runnability during continuous printing was evaluated based on the following criteria. The evaluation was performed for both the chill roll surface (front) and the anti-chill roll surface (back). [Evaluation criteria] Without heavy running: ○ With heavy running: ×

(9) Total light transmittance of the film The total light transmittance of the films of Examples 1 to 3 and Comparative Examples 1 and 2 was measured using a turbidimeter (NDH-1001DP, manufactured by Nippon Denshoku Industries Co., Ltd.). The rate was measured.

2. Test Results Table 1 shows the results of Test Examples (1) to (5), and Table 2 shows the results of Test Examples (6) to (9).

[0060]

Example 1 79.95% by weight of a polyethylene terephthalate resin having an intrinsic viscosity of 0.62, 20% by weight of anatase type titanium dioxide (TA-300, manufactured by Fuji Titanium Industry Co., Ltd.), and fluorescence enhancement Whitening agent (OB-1, Eastman) 0.
A polyester resin composition consisting of
It was melted at 5 ° C and extruded on a drum having a surface temperature of 40 ° C to obtain an unstretched sheet. Next, the obtained unstretched sheet was stretched 3.5 times in the longitudinal direction at 90 ° C. to obtain a uniaxially stretched film. As a resin component, a copolymerized polyester resin (Vylonal, manufactured by Toyobo Co., Ltd.) is 4% by weight in solid content, and a water-soluble urethane resin in which terminal isocyanate groups are blocked by hydrophilic groups (Elastron, Daiichi Kogyo Seiyaku Co., Ltd.) Of quaternary ammonium cation as an antistatic agent in an amount of 7% by weight based on the resin component, and benzoguanamine-based particles having a particle size of 2 μm with respect to the resin component. A coating solution for forming a recording layer was prepared by blending so as to be 4% by weight. Using a wire bar (No. 8), this coating solution was applied to both sides of the uniaxially stretched film so as to have a thickness of 12 g / m ^{2 in} a wet state, and dried at about 70 ° C. for 30 seconds. At 110 ° C., the film was stretched 3.8 times in a direction (lateral direction) perpendicular to the uniaxially stretched direction.
The heat treatment was performed while warming 4% in the horizontal direction for 0 seconds. Furthermore, it is heat-treated at 240 ° C. so as to be 3% warm in the vertical direction,
Finally, a 75 μm thick white polyester film for recording having recording layers on both sides was obtained.

Example 2 Polyethylene terephthalate resin 7 having an intrinsic viscosity of 0.62
9.99% by weight, anatase type titanium dioxide (TA-3)
00, manufactured by Fuji Titanium Industry Co., Ltd.) for the layer (A), comprising a polyester resin composition comprising 20% by weight and 0.01% by weight of carbon black, and 69.95% by weight of a polyethylene terephthalate resin having an intrinsic viscosity of 0.70. %, Titanium dioxide (TA-300, manufactured by Fuji Titanium Industry Co., Ltd.) 30
% By weight, and a polyester resin composition containing 0.1% by weight of a fluorescent whitening agent (OB-1, manufactured by Eastman Co., Ltd.) for a layer (B). The same method as in Example 1 was used except that the base material had a three-layer structure in which the thickness was B layer / A layer / B layer = 10/100/10 μm. A white polyester film for recording was obtained.

Example 3 Finally, the thickness was B / A / B = 18/152/18
A white polyester film for recording having a recording layer on both surfaces was obtained in the same manner as in Example 2 except that the base material had a three-layer structure of μm and the total thickness was 188 μm.

Comparative Example 1 A white polyester for recording having a thickness of 110 μm was prepared in the same manner as in Example 2 except that no coating layer was formed on the uniaxially stretched film as a base material and no recording layer was formed. A film was obtained.

Comparative Example 2 A 110 μm thick recording white paper having a recording layer on both sides was prepared in the same manner as in Example 2 except that no antistatic agent was added to the coating solution for forming the recording layer. A polyester film was obtained.

[0065]

[Table 1] Table: Chill roll surface (F) Back: Anti-chill roll surface (B)

[0066]

[Table 2] Table: Chill roll surface (F) Back: Anti-chill roll surface (B)

[0067]

The white polyester film for recording of the present invention is excellent in hiding properties, whiteness, and stability thereof,
In addition, a clear image can be formed with excellent adhesion to an adhesive or ink on the surface. In addition, it is excellent in strength and stretchability, is prevented from being charged on the surface, and is excellent in processability and printability.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 7/00 B41M 5/26 101H (72) Inventor Yasushi Sasaki 2-1-1 Katata, Otsu City, Shiga Prefecture F-term in Toyobo Co., Ltd. Research Laboratory (Reference) 2H086 BA19 BA34 BA41 2H111 CA25 CA30 CA41 4F100 AA01A AA01D AA20 AA20H AA21 AA21H AK25B AK25C AK41A AK41B AK41C AK41D AK42 AK51A13 BA03 AL03 DE01A DE01D GB90 HB00A HB00D JA03 JA20 JG04B JG04C JL10A JL10D JN08 YY00 YY00B YY00C

Claims (8)

[Claims] 1. A white polyester film having at least one layer of a polyester resin composition containing particles in an amount of 6% by weight or more and 40% by weight or less as a base material. A recording layer containing at least one resin selected from a urethane-based resin, an acrylic resin, and a polyester urethane resin, and the recording layer has a surface electric resistance of 13 (logΩ /
□) A recording white polyester film characterized by the following. 2. A polyester resin, a urethane resin,
The recording white polyester film according to claim 1, wherein a recording layer containing at least one selected from an acrylic resin and a polyester urethane resin is provided on both sides of the base material. 3. The surface electric resistance value of both surfaces of the film is 13
(LogΩ / □) or less.
Or the white polyester film for recording according to 2. 4. The base material contains particles in an amount of 1% by weight to 40% by weight on at least one surface of a layer (A) made of a polyester resin composition containing particles in an amount of 6% by weight to 35% by weight. The white polyester film for recording according to any one of claims 1 to 3, wherein the white polyester film has a multilayer structure having a layer (B) made of a polyester-based resin composition. 5. The white polyester film for recording according to claim 1, wherein a heat shrinkage at 150 ° C. is 1.0% or less. 6. The white polyester film for recording according to claim 1, which has a color b value of -1.0 or less. 7. The white polyester film for recording according to claim 1, wherein the total light transmittance is 10% or less. 8. A sublimation transfer recording system, a thermal transfer recording system, an ink jet recording system, an electrophotographic recording system,
The white polyester for recording according to any one of claims 1 to 7, which is any one of an intaglio printing recording system, a relief printing recording system, a stencil printing recording system, and a lithographic printing recording system. the film.