JPH05221114A - Recording sheet - Google Patents

Abstract

PURPOSE:To provide a recording sheet having good thermal dimensional stability, sufficient flexibility and sufficient whiteness, excellent in processing aptitude, handling properties and printing sharpness, capable of reconciling the antistatic properties of a receiving layer and the easy adhesiveness of ink or toner and having excellent characteristics. CONSTITUTION:In a recording sheet consisting of a receiving layer, a film support and a transfer ink layer, the film support is a polyester film wherein a heat shrinkage rate at 150 deg.C is below 2% and specific gravity is 1.2 or less and the receiving layer is composed of a layer containing a polymeric binder and white hiding pigment.

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 suitable for use as a slip such as a single form or a continuous form.

[0002]

2. Description of the Related Art Recording sheets are used for various purposes. For example, in a copy-type voucher, a recording sheet and a recording sheet (usually made of paper) are stacked and the front side of the recording sheet is used. Type pressure applied to (receptive layer side),
A necessary amount of ink is transferred in the form of characters or figures from the ink layer provided on the back side of the recording sheet onto the recording sheet by writing pressure, heat, or the like.

Conventionally, paper has been the dominant support for such recording sheets. However, for example, in a transportation slip such as a courier service, the recording sheet located on the surface of the slip is required to have durability and weather resistance. Therefore, a recording sheet using a plastic film, which is stronger than paper, as a support has come to be used. However, while the film support is excellent in durability and weather resistance, it is inferior in printability and writability as it is, so various surface modifications have been devised. A conventional recording sheet having a film as a support usually has a layer structure of receiving layer / film support / ink layer, and the receiving layer is a polymer resin layer having easy adhesion to ink. Those that have been applied, those that contain an antistatic agent in the polymer resin layer and have an antistatic effect in the receiving layer, and those that contain inorganic or organic particles and have clear printing in the receiving layer, etc. Are known.

[0004]

However, in the case of a conventional recording sheet using a film as a support, the adhesion between the film support and the receiving layer or the ink layer is insufficient, especially when a temperature change occurs. The adhesion between the film support and the receiving layer or the ink layer may be insufficient. Further, since the film support has insufficient flexibility, there is room for improvement in processability and handleability of the recording sheet as a whole. Further, the whiteness is also insufficient, and it is desired to further improve the printing sharpness. Further, there is a problem that the antistatic agent in the receiving layer migrates to the surface with the passage of time and is likely to be lost, resulting in lack of sustainability of the antistatic effect of the receiving layer. Therefore, especially during printing, charging is likely to occur and uneven printing or dust is likely to adhere. As described above, there is a problem that it is difficult to achieve both antistatic property and easy adhesion of ink or toner.

The present invention solves the above problems,
Excellent adhesion to temperature changes (good thermal dimensional stability), sufficient flexibility (cushioning properties), whiteness, excellent processability, handleability, and clear printing. Another object of the present invention is to provide a recording sheet having excellent properties such that the antistatic effect of the receiving layer is excellent and the antistatic property and the easy adhesion of ink or toner are compatible with each other.

[0006]

The recording sheet of the present invention for this purpose is a recording sheet comprising a receiving layer / film support / transfer type ink layer, wherein the film support is 15
This is a polyester film having a heat shrinkage ratio of less than 2% at 0 ° C. and a specific gravity of 1.2 or less, and the receiving layer is composed of a layer containing a polymer binder and a white hidden pay pigment.

The material of the film support of the present invention is not particularly limited as long as it is polyester. Polyester film is a general term for polymer films having an ester bond as the main chain of the main chain, and particularly preferred polyesters are polyethylene terephthalate and polyethylene 2,6.
-Naphthalate, polyethylene α, β-bis (2-chlorophenoxy) ethane 4,4′-dicarboxylate,
Polybutylene terephthalate and the like are preferred, and among these, polyethylene terephthalate (hereinafter sometimes abbreviated as PET) is most preferable in view of quality, economy and the like. Further, in this PET, known additives such as heat resistance stabilizer, oxidation resistance stabilizer, weather resistance stabilizer, ultraviolet absorber, organic lubricant, pigment, dye, organic or inorganic fine particles, filler, release agent, etc. A mold agent, an antistatic agent, a nucleating agent and the like may be added.

The PET film is unoriented, uniaxially oriented,
Although biaxially oriented PET film can be used, a biaxially oriented PET film is preferable because of its excellent mechanical strength. The biaxially oriented PET film is produced by stretching a PET sheet or film in an unstretched state by a factor of 2.5 to 5 in the so-called biaxial directions of the longitudinal direction and the width direction. It refers to those showing a pattern of orientation.

In the case where the PET film has been subjected to surface treatment, that is, corona discharge treatment (in air, nitrogen, carbon dioxide, etc.) or easy adhesion treatment by a known method, the receptive layer or the transfer type ink layer is used. It can be more preferably used because the adhesion to water, water resistance, solvent resistance and the like are improved. For the easy-adhesion treatment, various known methods can be used, and various types of easy-adhesives such as acrylic, urethane, and polyester adhesives applied in the film manufacturing process, or the above-mentioned film after uniaxial or biaxial stretching are used. Those coated with various types of easy-adhesives such as can be suitably used.

The thickness of the PET film as the film support is not particularly limited, and an appropriate thickness can be set within the range of about 1 to 500 μm, for example, from the strength of the waist required for the recording sheet.

Also, the surface roughness and haze of the film support are not particularly limited, and the adhesive strength required between the receiving layer or the transfer type ink layer described later and the film support, and the recording sheet are required. It may be appropriately set to a desired value in consideration of transparency, whiteness and the like.

A film support made of this PET film has a heat shrinkage ratio at 150 ° C. of less than 2%. By thus suppressing the heat shrinkage rate of the film support to a low level, sufficient adhesion between the film support and the receiving layer or the transfer type ink layer can be obtained even when the temperature changes.

In the present invention, the specific gravity of the film support is 1.2 or less, preferably 1.0 or less.
Since the film support is made of PET film, in order to suppress the specific gravity to 1.2 or less, for example, a special device as described below is required.

First, there is a method in which an incompatible polymer is dispersed and mixed in a PET film. When PET and an incompatible polymer are dispersed and mixed in the form of particles, voids are formed around the incompatible polymer particularly when the PET is stretched into a film, and the specific gravity can be suppressed to a low level, and at the same time, the film can be formed. Whitened due to numerous voids. The PET film as the film support thus obtained has a lower specific gravity than ordinary PET film and has excellent whiteness and cushioning property. The shape factor of the incompatible polymer to be dispersed and mixed in the film is 1 to
It is preferably 4. The average equivalent spherical diameter of voids in a film formed of an incompatible polymer is 1
The thickness is preferably 10 μm to 10 μm.

The incompatible polymer is not particularly limited as long as it is a polymer incompatible with PET, but is preferably methylbutene polymer, methylpentene polymer, styrene polymer, fluorine polymer, cellulose acetate, cellulose propolymer. It is a polymer having a melting point of 200 ° C. or higher selected from pionate polymers.

In order to keep the specific gravity of the film support low, the PET film may be mixed with or dispersed in the incompatible polymer or separately from the incompatible polymer for the purpose of lowering the specific gravity. It is also effective to include a low specific gravity agent. The low specific gravity agent is a compound having an effect of reducing specific gravity by adding it to PET,
The effect is observed only in a specific compound. For example, the specific gravity reducing agent can be selected from polyalkylene glycol, ethylene oxide / propylene oxide copolymers, alkylbenzene sulfonates, alkyl sulfonates and modified products thereof, and copolymers thereof with polyesters.

In the recording sheet of the present invention, a transfer type ink layer is provided on the surface of the film support opposite to the receiving layer. Various transfer inks have been proposed,
Typical examples thereof include an ultraviolet curable type and a hot melt type, but the hot melt type is preferable in the present invention in view of cost and the like.

The hot-melt ink is heated and melted or heated to a constant temperature on the printing machine until it is applied to the material to be printed by printing, and maintains printability such as fluidity, and is cooled or kept at room temperature after printing. In order to form a strong coating film on the material to be printed, the hot melt ink used in the recording sheet of the present invention is not particularly limited, and known heating type copying carbon ink, transfer type thermal ink, hot type Melt type glass ink or the like can be used. Carbon ink is suitable for slips, and transfer type thermal ink is suitable for transfer recording with a thermal head in a computer or a personal computer. The method for forming the hot melt ink layer is not particularly limited, and a known method can be used,
The ink layer is provided on the entire surface or at a predetermined position.

The receptive layer of the present invention is a layer containing or containing as a main component a polymer binder and a white hidden pay pigment.
The layer containing the main component refers to a layer that itself is 30% by weight or more in the receiving layer, and other substances may be added as appropriate.
In the present invention, such a receiving layer is provided on one surface of the film support.

The polymer binder referred to in the present invention is a resin which is selected from a thermoplastic resin or a curable resin and is soluble in a well-known organic solvent and has a small amount of hydrophilic groups or hydrophilic components. It is preferable in terms of water resistance and moisture resistance of the receiving layer. Specific examples include thermoplastic resins such as polyester, polyamide, polyesteramide, polyvinyl acetal, polyvinyl chloride, poly (meth) acrylic acid ester, polyimide, polyurethane, polycarbonate,
Polystyrene, polymethylpentene, polyolefin,
Examples thereof include halogenated polyolefin, alkyd resin, polyamideimide, silicon resin, fluororesin and the like, and copolymers and mixtures thereof. Further, as the curable resin that is cured by light, heat, oxygen, etc., for example, phenol resin,
Examples thereof include melamine resin, epoxy resin, and crosslinked organosilicon resin. In the present invention, it is preferable to use a thermosetting resin in view of water resistance, solvent resistance, heat resistance, abrasion resistance, mechanical strength, etc. of the receiving layer, and further, a material which can be crosslinked by using a well-known crosslinking agent is more preferable. preferable.

Further, in the present invention, among the above-mentioned polymer binders, urethane resin and acrylic copolymer resin are preferably applied, and acrylic copolymer resin is most preferable, and poly (meth) acrylic ester copolymer copolymer is particularly preferable. It is united.
The poly (meth) acrylic acid ester copolymer is a poly (meth) acrylic acid ester copolymer containing a reactive monomer, and such a reactive monomer includes a functional group such as a carboxyl group (for example, (Meth) acrylic acid, etc., hydroxyl group (2-hydroxyethyl (meth) acrylate, etc.), amide group ((meth) acrylic acid amide, etc.), glycidyl group (glycidyl (meth) acrylate, etc.), amino group ((( (Meth) acrylic acid 2-diethylaminoethyl etc.) and the like.

The acrylic copolymer resin having a hydroxyl group of 40 or more, preferably 45 or more is preferable in terms of adhesion to a film support, coating film forming property, and easy adhesion to ink or toner. preferable. The hydroxyl value in the present invention is defined as follows. That is, it is the number of mg of potassium hydroxide corresponding to the number of moles of hydroxyl groups contained in 1 g of the sample.

Examples of the organic solvent for the thermosetting resin include well-known alcohol-based, carboxylic acid ester-based, ketone-based, aliphatic hydrocarbon, alicyclic or aromatic hydrocarbon-based solvents, and mixed systems thereof. Among them, it is preferable to select one that does not adversely affect the coating property and the like.

The white hidden pay pigment used in the present invention is an inorganic or organic pigment that exhibits a white color in the receiving layer. Examples of the inorganic pigment include zinc carbonate, zinc oxide, zinc sulfide, and the like.
Talc, carion, heavy / light or synthetic calcium carbonate, titanium oxide, silica, lithium fluoride, calcium fluoride, barium sulfate, alumina, zirconia, calcium phosphate, natural or synthetic swelling or non-swelling mica, etc. Examples of the organic pigment include polystyrene, polymethylstyrene, polymethoxystyrene, polyvinyl chloride, polyethylene, polypropylene, polyvinylidene chloride, polymethacrylate, polymethylmethacrylate, polychloroacrylate, styrene-divinylbenzene copolymer. , Melamine resin, epoxy resin, phenol resin, fluororesin, and the like,
At least one selected from these is applied, but is not particularly limited. Further, the pigment may be in a hollow porous state or a non-hollow porous state. Further, the pigment may be subjected to a treatment such as addition of a functional group such as glycidyl or methylol group to the surface thereof in order to improve dispersibility in the resin.

The average particle size of the white hidden pay pigment is 0.1 to 25.
It is preferable that the thickness is in the range of 1.0 μm, preferably 1.0 to 10 μm from the viewpoint of handleability and coatability. The content of the white hidden pay pigment in the receiving layer is preferably 0.1 to 70% by weight, more preferably 5 to 50% by weight. The content is 0.
If it is less than 1% by weight, the white concealing paying property is sufficient, and if it is 70% by weight or more, the adhesiveness between the receiving layer and the film substrate tends to be lowered.

In the present invention, the adhesion of the receiving layer, solvent resistance,
In order to further improve the heat resistance, it is preferable that the receiving layer contains a cross-linking agent.

The cross-linking agent as used in the present invention is a cross-linking reaction with a functional group present in the polymer binder, such as a hydroxyl group, a carboxyl group, a glycidyl group, an amide group, etc., and finally a three-dimensional network structure. A cross-linking agent for forming a receptive layer having, and representative examples include methylolated or alkylolated urea-based, melamine-based, acrylamide-based, polyamide-based resins, and epoxy compounds, isocyanate compounds, aziridine compounds and the like. it can.
In the present invention, among these, it is preferable to apply an isocyanate compound from the viewpoint of adhesion to the film support, crosslinkability and the like.

These cross-linking agents may be used alone or in combination of two or more depending on the case. The amount of the cross-linking agent to be added is appropriately selected depending on the type of the cross-linking agent, but is usually 0.01 to 50 parts by weight, preferably 0.1 to 30 parts by weight, based on 100 parts by weight of the solid content of the polymer binder. Is more preferable. Further, it is more preferable to use a crosslinking catalyst together with the crosslinking agent because crosslinking will proceed further. As a crosslinking catalyst, salts, inorganic substances,
Known substances such as organic substances, acid substances and alkaline substances can be used. The amount of the crosslinking catalyst to be added is 0.001 to 10 parts by weight based on 100 parts by weight of the solid content of the polymer binder,
It is preferably 0.1 to 5 parts by weight. The polymer binder containing the cross-linking agent is applied to the film support and then heated, exposed to ultraviolet light,
Although it is crosslinked by an electron beam or the like, a method of heating is generally used.

Further, in the present invention, the surface electric resistance of the receiving layer is preferably 10 ⁷ to 10 ¹³ Ω / □, and more preferably 10 ⁸ to 10 ¹¹ Ω / □. If the surface electric resistance value is lower than the above range, the toner transfer efficiency is poor,
On the other hand, if it is higher than the above range, uneven transfer of toner and toner stain may occur, and there is a possibility that a feeding error or running failure may occur due to electrification.

In order to achieve the surface electric resistance of the receiving layer, the receiving layer may contain a polyelectrolyte and / or a conductive powder. As the polyelectrolyte, a quaternary ammonium salt or other cation polymer such as quaternary ammonium salt, a nonionic polymer such as poval, polyethylene glycol, or alkylamine, an anionic polymer having an anionic polar group such as carboxylic acid or sulfonic acid, or these And the like. Examples of the conductive powder include tin oxide, indium oxide, zinc oxide, tantalum oxide, and combinations thereof. Among them, the quaternary ammonium salt-based KAOTIN-based polymer is effectively used from the viewpoints of conductivity and compatibility with the polymer binder, and among the quaternary ammonium salt and other KAOTIN-based polymers, the KAOTIN-based acrylic polymer is preferable. used.

Further, in the present invention, the receiving layer of JIS described later is used.
It is desirable that the whiteness calculated according to -L-1015 is 40% or more, preferably 60% or more. When the whiteness is less than 40%, the hidden pay property becomes insufficient, the resolution and sharpness of the type on the surface of the receiving layer are lowered, and a reading error is likely to occur in the case of a bar code, for example, which is not preferable. The laminated thickness of the receiving layer is not particularly limited, but is preferably 0.5 to 50 μm, and 1.0 to 2
A particle size in the range of 0 μm is desirable from the viewpoints of uniform formation of the receiving layer and adhesion. Further, in the receiving layer, if necessary, known additives such as antifoaming agents, coatability improvers, thickeners, antistatic agents, ultraviolet absorbers, dyes, etc. are added in an amount that does not impair the effects of the present invention. May be included.

As the method for forming the receiving layer, any known method such as a gravure coating method, a reverse coating method, a bar coating method or a kiss coating method can be used.

Further, in the recording sheet of the present invention, a metal vapor deposition layer may be provided on at least one surface of the film support depending on the application (for example, when light-shielding property or moisture-proof property is required). The metal vapor deposition layer is a low-melting metal such as aluminum, zinc, copper or tin, an oxide thereof, a nitride thereof, or an alloy containing them by a known vacuum vapor deposition method such as vapor deposition, sputtering, or ion plating. Is a layer formed by adhering a metal such as iron, nickel, cobalt, or titanium, or an alloy containing them, on the surface of the base PET film. Further, the metal vapor deposition layer may be in the form of a composite layer made of different metals, or may be a metal oxide layer formed by a so-called reactive vapor deposition method. The thickness of the metal vapor deposition layer is not particularly limited, but can be 0.
The range is preferably about 001 to 0.2 μm, more preferably 0.005 to 0.1 μm. When gas barrier properties such as light-shielding properties, moisture resistance, and aroma retention are required, it is preferable that the metal vapor deposition thickness satisfy the necessary characteristics.

[0034]

In the recording sheet of the present invention, a receiving layer containing a polymer binder and a white hidden pay pigment is formed on a film support having a small heat shrinkage and a low specific gravity. It was possible to obtain an excellent effect such as.

First, in the recording sheet of the present invention, the thermal contraction rate of the film support is suppressed to a low level, so that the thermal dimensional stability is excellent and excellent adhesion with the receiving layer can be achieved.

In the recording sheet of the present invention, the specific gravity of the film support is as small as 1.2 or less, and further, the cushioning property and the thermal dimensional stability are excellent, so that it is possible to reduce the weight, processability and handling. It has excellent properties.

Further, in the recording sheet of the present invention, the whiteness of the film support can be increased by adding an incompatible polymer and a low specific gravity agent to the polyester of the film support, and the printed characters can be identified. It is easy and gives a high-class image.

Further, the receptive layer of the recording sheet is suitable for printing with various inks such as UV curable ink, electron beam curable ink, oil-based ink, thermal transfer ink ribbon, electrophotographic toner and the like, printability with a dot printer, ballpoint pen and Excellent in writing with a pencil.

Further, the recording sheet has both excellent easy-adhesion properties and excellent antistatic properties, and since its excellent antistatic effect can be maintained as it is, it is free from dust and the like and has good printability. Are better.

Since the recording sheet of the present invention has the above-mentioned excellent characteristics, it can be applied to various uses for which copying and recording are required, but among them, it is suitable for slips for business use or courier service. ..

[Measurement and Evaluation Methods] The characteristic values of the present invention are based on the following measurement methods and evaluation criteria. (1) Surface roughness According to JIS-B0601-1976, a cutoff of 0.
25 mm, measuring length 4 mm, center line average roughness Ra (μm)
And the maximum roughness Rt (μm).

(2) Average spherical equivalent diameter of voids in a film formed of an incompatible polymer A cross section taken in the machine direction or the vertical direction of the film forming process of the film is 1000 times to 5000 times under a scanning electron microscope.
A photograph magnified twice is taken, and at least 100 voids in the specified thickness range are applied to an image analyzer to obtain a distribution of circle diameters corresponding to the void areas.
The volume average diameter of this distribution is defined as the average spherical equivalent diameter of the void.

(3) Specific gravity 25 using a density gradient tube of carbon tetrachloride-n-heptane system
Values in ° C are used.

(4) Heat shrinkage rate The film has a width of 10 mm and a length of 300 in the longitudinal or width direction.
After cutting into mm, marking at 200 mm intervals and fixing to a support plate under constant tension (5 g), the original length a (mm) of the marking interval is measured. Next, a load is applied using a clip of 3 g and the treatment is performed for 30 minutes while rotating in a hot air oven at 150 ° C., and the marking interval b (mm) is measured in the same manner as the measurement of the original length. The heat shrinkage rate is calculated by the following formula, and the average value of 5 is used. Heat shrinkage rate (%) = (ab) / a

(5) Optical Density The transmission density is measured using an optical densitometer (TR927, manufactured by Macbeth Co.). The film thickness and the optical density are plotted, and the optical density corresponding to each thickness is obtained.

(6) Whiteness U manufactured by Shimadzu Corporation according to JIS-L-1015
When V-260 is used and reflectances at wavelengths of 450 nm and 550 nm are B% and G%, respectively, whiteness (%) = 4B-3G.

(7) Stretchability When a film is continuously formed for 24 hours, a film having no film tear is defined as "good" and a film having two or more film breaks is designated as "breakage".

(8) Cushion ratio (%) Dial gauge NO. 2109-10
The standard gauge head 900030 is used for the dial gauge stand NO. Using the 7001DGS-M, the thickness is calculated from the following film thicknesses d ₅₀ and d ₅₀₀ when a load of 50 g and 500 g is applied to the dial gauge pressing portion. Cushion factor = _{[(d 50 -d 500) / d} 50 ] × 100

(9) Shape Factor As in the case of obtaining the average diameter of voids, the shape of the incompatible polymer in the film cross section is applied to an image analyzer and expressed as an average ratio of 100 long / short diameters.

(10) Adhesiveness of Receptor Layer The adhesiveness of the receptive layer / support is determined by putting a crosscut (100 pcs / cm ² ) on the receptive layer and serotape: CT- at 45 ° to the crosscut surface. 24 (manufactured by Nichiban Co., Ltd.)
Was adhered and pressed back and forth 5 times with a load of 2 kg using a hand roller, the cellophane tape was forcibly peeled in the direction of 180 °, and the degree of peeling of the receptor layer was observed and evaluated. The judgment criteria are: ⊚: very good (peeling area 0%), ◯: good (peeling area less than 5%), Δ: somewhat inferior (peeling area 5% or more 20
%), X: Poor (peeled area 20% or more).

(11) Easy adhesion UV ink (FDO manufactured by Toyo Ink Co., Ltd.) on the receiving layer
(Black)) is applied to a film thickness of about 5 μm, and UV lamp 120W
/ Cm × 2 lights at 6 m / min (height 150 mm) for irradiation and curing, and after 24 hours, cellophane tape was stuck on the UV ink layer, and the evaluation was made by the same method as the above (10).

(12) Surface electric resistance Using a digital ultra high resistance / micro ammeter (type R8340) manufactured by Advantest Co., Ltd., 20 ° C., 65% RH
It was measured at.

(13) Charging property Using a static Honest meter type S-4104 (manufactured by Shishido Shokai), after charging the receptive layer at a discharge voltage of 10 KV, the charge decay at 20 ° C. and 60% RH is halved (second). It was evaluated and judged as follows. ◯: Good (1 second or less), Δ: Slightly inferior (2 to 30 seconds), X: Bad (30
More than a second).

(14) Image characteristics A copy test was performed using an electrostatic copying machine (type 5055) manufactured by Fuji Xerox Co., Ltd., and the image characteristics were evaluated with the naked eye, and the following judgment was made. ◯: The image is clear. Δ: The image is slightly lacking in clarity. X: The image is unclear or the density is low, or there is toner scattering or stains.

[0054]

The present invention will be described with reference to the following examples and comparative examples, but the present invention is not limited to these. Example 1 Polyethylene terephthalate (intrinsic viscosity [η] = 0.6
5) was mixed with 94% by weight, poly-4-methylpentene-1 (TPI-D820, Mitsui Petrochemical Co., Ltd.) 5% by weight, and 1% by weight of polyethylene glycol having a molecular weight of 4000 was supplied to the extruder A. It was melted at 285 ° C. by a conventional method and introduced into the central layer of the T-die three-layer composite die.

On the other hand, the above polyethylene terephthalate 9
0% by weight of calcium carbonate (average particle size 0.8 μm) 1
The raw material added with 4% by weight was supplied to an extruder B, melted at 285 ° C. by a conventional method and laminated on both surface layers of a T-die three-layer composite spinneret, and the melt sheet was kept at a surface temperature of 25 ° C. The solid was cooled and solidified on the cooling drum by the electrostatic charge method. Then, the cast sheet was stretched 3.5 times in the longitudinal direction using a roll group heated to 98 ° C. in the longitudinal direction, and cooled to 25 ° C. Furthermore, the drawn film is guided to a tenter 1
The film was stretched 3.2 times in the width direction in an atmosphere heated to 25 ° C. and heat-set at 225 ° C. to obtain a film having a thickness of 50 μm. The thickness of each film layer was 3 μm on the surface layer and 44 μm on the central layer.

Both sides of the biaxially stretched film were subjected to corona discharge treatment, and toluene / methylethylketone (mixing ratio: 1: 1) was used as a diluting solvent on one side of the biaxially stretched film, and this was thermally crosslinked with a hydroxyl value of 60 as a polymer binder. Type acrylic resin “Cotax” LH613 (manufactured by Toray Industries, Inc.) and 20 parts by weight of silicon oxide having an average particle size of 1.0 μm and titanium oxide having an average particle size of 0.3 μm as a white hidden pay pigment based on the resin solid content. 2. A uniform dispersion coating material having a concentration of 25% by weight added with 10 parts by weight of was added, and the coating layer was dried at 120 ° C. for 1 minute to obtain a thickness of 3.
A 0 μm receiving layer was provided.

Next, the film thus obtained is used as 125
After setting on a hot plate set to ± 5 ° C, the hot melt ink “HTS” manufactured by Teikoku Ink Co., Ltd.
66S "rubber convex black is applied by the bar method, and the ink layer is 5.0
A recording sheet having μm was prepared. The characteristics of the recording sheet are as shown in Tables 1 and 4, and it is understood that the recording sheet is a low specific gravity film having excellent thermal stability and high cushioning property and whiteness. The receiving layer was also excellent in each property.

[0058]

[Table 1]

Comparative Examples 1 and 2 The same procedure as in Example 1 was repeated except that the incompatible polymer poly-4-methylpentene-1 used in Example 1 was replaced with polypropylene (Noblene 4H manufactured by Mitsui Toatsu Co., Ltd.). The case was designated as Comparative Example 1, and the case where the heat treatment in Comparative Example 1 was not performed was designated as Comparative Example 2. The characteristics of the obtained film are shown in Tables 2 and 4. As described above, it is understood that when polypropylene is used, a low specific gravity film excellent in dimensional stability cannot be obtained.

[0060]

[Table 2]

Examples 2 and 3 and Comparative Example 3 Recording sheets were obtained in the same manner as in Example 1 except that the addition amount of the low specific gravity agent polyethylene glycol (PEG) used in Example 1 was changed. The characteristics of the obtained film are shown in Tables 3 and 4. It can be seen that a film having low specific gravity and excellent thermal dimensional stability can be obtained by adding the low specific gravity agent polyethylene glycol.

[0062]

[Table 3]

Example 4 Based on Example 1, a polymer binder "Cotax" LH613 (manufactured by Toray Industries, Inc.) was used as a coating material for the receiving layer, and a cationic polymer "Elecond" PQ-50 was used as a polymer electrolyte.
B (manufactured by Soken Kagaku Co., Ltd.) was mixed at a solid content weight ratio of 1: 1 and a white hidden pay pigment was added to this prepared solution in the same manner as in Example 1 except for the total solid content. A recording sheet was obtained in the same manner as in Example 1. As shown in Table 4, it can be seen that the recording sheet is excellent in each characteristic.

Example 5 Based on Example 4, "COTAX" LH681 (manufactured by Toray) having a hydroxyl value of 50 and urethane resin "Nipporan" 3022 (manufactured by Nippon Polyurethane Co., Ltd.) having a hydroxyl value of 50 were used as polymer binders. A recording sheet was prepared in the same manner as in Example 4 except that the mixture of solid content weight ratio of 1: 1 was used.
The properties of the recording sheet were excellent in each property as shown in Table 4.

Example 6 In the coating material of Example 5, an isocyanate sheet compound "Sumijour" N-75 (Sumitomo Bayer Co., Ltd.) was used as a cross-linking agent for the solid content of the polymer binder of the coating material. A recording sheet was obtained in the same manner as in Example 5 except that 20 parts by weight of (produced) was added. As shown in Table 4, the recording sheet was excellent in balance of each characteristic.

Example 7 The biaxially stretched polyester film obtained in Example 1 was vacuum-deposited on aluminum at a pressure of 10 ⁻⁴ Torr to a thickness of about 0.06 μm by using a winding type vacuum vapor deposition machine. Next, the coating material of Example 6 was applied to the non-vapor-deposited surface of the film in the same manner as in Example 6, and the transfer ink layer of Example 1 was applied to the vapor-deposited surface of Example 1.
A recording sheet was prepared in the same manner as above. The recording sheet had a gloss peculiar to the vapor deposition film and, as shown in Table 4, was excellent in each property.

[0067]

[Table 4]

Claims (9)

[Claims] 1. A recording sheet comprising a receiving layer / film support / transfer type ink layer, wherein the film support is 15
A recording sheet comprising a polyester film having a heat shrinkage at 0 ° C. of less than 2% and a specific gravity of 1.2 or less, wherein the receiving layer comprises a layer containing a polymer binder and a white hidden pay pigment. .. 2. The receptive layer contains a polyelectrolyte and / or a conductive powder, and the electric resistance of the surface of the receptive layer is 10 or less.
The recording sheet according to claim 1, wherein the recording sheet has a resistance of ⁷ to 10 ¹³ Ω / □. 3. The recording sheet according to claim 1, wherein the polymer binder is an acrylic copolymer resin having a hydroxyl value of 40 or more. 4. The recording sheet according to claim 1, wherein the receiving layer is crosslinked with an isocyanate compound. 5. The recording sheet according to claim 1, wherein an incompatible polymer is dispersed and mixed in the polyester film, and the shape factor of the incompatible polymer in the film is 1 to 4. .. 6. The incompatible polymer is methylbutene polymer, methylpentene polymer, styrene polymer,
The recording sheet according to claim 5, which is a polymer having a melting point of 200 ° C or higher selected from a fluoropolymer, a cellulose acetate, and a cellulose propionate polymer. 7. The recording sheet according to claim 1, wherein the polyester film is obtained by adding a low specific gravity agent to polyester. 8. The low specific gravity agent is selected from polyalkylene glycols, ethylene oxide / propylene oxide copolymers, alkylbenzene sulfonates, alkyl sulfonates and modified products thereof, and copolymers thereof with polyesters. The recording sheet according to claim 7, which is a sheet. 9. The recording sheet according to claim 1, wherein the film support has a metal vapor deposition layer on at least one surface.