JPH0558070A - Recording paper - Google Patents

Abstract

PURPOSE:To prevent the curling of recording paper having a polyolefinic film having good surface smoothness and excellent in the adhesion to a thermal head as a support layer caused by the heat of the thermal head at the time of thermal recording. CONSTITUTION:Recording paper 1 is obtained by forming a coating layer 3 on one or both surfaces of a support layer composed of a polyolefinic film 2 by infiltrating alcohol ester of high fatty acid in said support layer and further forming a thermal recording layer or a thermal transfer image receiving layer 4 thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive recording paper or a recording paper excellent in heat-sensitive recording suitability, which uses a polyolefin film as a support for a thermal transfer image receiving sheet.
More specifically, the present invention relates to a recording paper excellent in heat-sensitive recording suitability in which a polyolefin film is used for a support layer and curling of the recording paper due to heat of a thermal head during heat-sensitive recording is prevented.

[0002]

2. Description of the Related Art Conventionally, recording papers such as thermal recording papers and thermal transfer recording papers have been constructed by forming a thermal recording layer or a thermal transfer image receiving layer on one side of a support layer. Pulp paper is generally used as the layer, but with such pulp paper, the smoothness of the surface is poor,
Since the adhesion with the thermal head is poor, the image quality when recorded cannot be made sufficiently good. on the other hand,
There is also known one in which a polyolefin-based synthetic paper is used for the support layer of the thermal recording paper and the thermal transfer recording paper (Japanese Patent Application Laid-Open No. 6-58242).
No. 0-34898), a thermal recording paper or thermal transfer recording paper using such a polyolefin-based synthetic paper as a support has excellent surface smoothness, unlike the thermal paper using the pulp paper. From the above, a thermal recording paper or a thermal transfer recording paper having an extremely excellent image quality can be obtained, and an image quality comparable to that of a silver halide photograph can be obtained. Therefore, heat-sensitive recording paper or heat-sensitive transfer recording paper, which uses polyolefin-based synthetic paper with good image quality as a support, is used as a recording paper for printing images in medical ultrasonic diagnosis, radiography, and electron microscope image output. It is used as recording paper for still cameras and video cameras, CAD recording paper, and the like.

[0003]

However, the heat-sensitive recording paper and heat-sensitive transfer recording paper using such a polyolefin-based synthetic paper as a support are more difficult than the conventional recording paper using pulp paper as a support. Since it has poor heat resistance and contracts when heated to 120 ° C. or higher, the printing surface side is heated and contracted by the heat of the thermal head during thermal recording, and curl occurs. Therefore, in order to prevent such curling, recording paper obtained by laminating heat-resistant pulp paper and polyolefin-based synthetic paper (JP-A-62-1984).
No. 97) is also used, but for such bonding, processing makers other than film makers and paper makers are used.
However, since both materials are purchased and processed, this leads to an increase in cost in the production of recording paper. Therefore, it has been strongly desired to provide a recording paper which does not curl only with a support of a polyolefin film.

[0004]

[Means for Solving the Problems]

[Summary of the Invention] The inventors of the present invention have conducted extensive studies in view of the above problems, and as a result, a higher fatty acid ester is previously applied to the recording layer side of a polyolefin film to cause the polyolefin film to swell and swell the polyolefin film. If a coating layer is formed, shrinkage is less likely to occur due to heat of the thermal head during heat-sensitive recording and heat-sensitive transfer recording, and curling due to heat during and after heat-sensitive recording can be less likely to occur. The present invention has been completed based on the knowledge that That is, the present invention is a recording paper in which a heat-sensitive recording layer or a heat-sensitive transfer image-receiving layer is formed on a support made of a polyolefin film, and one or both sides of the support is impregnated with an alcohol ester of a higher fatty acid. The present invention provides a recording paper having a coating layer formed of the above.

[Detailed Description of the Invention] [I] Support for thermal recording medium and thermal transfer recording medium (1) Structure The recording paper 1 of the present invention is basically a polyolefin, as shown in FIG. A coating layer 3 formed by impregnating an alcohol ester of a higher fatty acid on one side or both sides of the base film layer 2, and a thermal recording layer or a thermal transfer image receiving layer 4 formed on the coating layer 3. is there.

(2) Polyolefin film layer The support layer made of a polyolefin film which constitutes the recording paper of the present invention is obtained by molding a polyolefin resin by various film molding methods.
Specifically, polyethylene, polypropylene, ethylene / propylene copolymer resin, polyolefin resin such as polybutene resin, ethylene / vinyl acetate copolymer resin,
An olefin copolymer obtained by copolymerizing a small amount of another comonomer with an olefin monomer such as ethylene / acrylic acid ester copolymer resin, styrene / polypropylene copolymer resin, or styrene / polyethylene copolymer resin. A polyolefin resin obtained by molding using a polymer or the like alone or a mixture of two or more thereof, or a polyolefin resin composition mixed with an inorganic fine powder is used for a casting method, an inflation method, a T method. -Die method, calendar method,
Polyolefin film formed by various film forming methods such as uniaxial stretching method, or obtained by mixing a small amount of inorganic fine powder into the film, and then stretching, having a microvoid on the surface, the film Opaque or translucent synthetic paper with many microvoids inside (Japanese Patent Publication Nos. 46-40794 and 6)
0-36173, JP-A-62-87390)
And so on. As the inorganic fine powder mixed with the polyolefin resin, calcium carbonate,
Examples thereof include titanium white, silica, titanium oxide, alumina, clay, talc, aluminum hydroxide, zinc white, iron oxide, and pigments. It is preferable to use an inorganic fine powder having a particle size of 15 μm or less, particularly 0.1 to 10 μm. Among these polyolefin films, a resin obtained by polymerizing or copolymerizing a monomer containing ethylene, propylene or both as a main component (50% by weight or more), and an inorganic or organic fine powder in the resin 8 to 65% by weight, preferably 18 to
Synthetic paper obtained by uniaxially or biaxially stretching a film containing 55% by weight and having a large number of microvoids inside a film having a so-called monolayer structure or bilayer or more structure is preferable from the viewpoint of printability. Examples of such polyolefin synthetic paper include Yupo FPG, Yupo KPG, Yupo TPG, Yupo GFG, and Yupo C from Oji Yuka Synthetic Paper Co., Ltd.
It is sold under the product names of FG and YUPO SGG. Such a polyolefin-based film support layer is usually 40 to
It is formed to a wall thickness of 500 μm, preferably 80 to 180 μm.

(3) Coating Layer The coating layer formed by impregnating the support layer of the recording paper of the present invention with a higher fatty acid ester comprises coating a part of the polyolefin film layer with a higher fatty acid alcohol ester. Since it is impregnated and swollen,
Although the material is basically the same as that constituting the polyolefin film layer, its surface structure is in a state where the polyolefin resin is impregnated with an alcohol ester of a higher fatty acid and swollen. .. (a) Surface structure The alcohol ester of the higher fatty acid applied in this manner is impregnated inside the polyolefin film layer to swell a part of the polyolefin film layer or a part thereof. May be exposed on the surface of the polyolefin film layer.

(B) Alcohol ester component of higher fatty acid The alcohol ester of higher fatty acid applied to one or both sides of the polyolefin film support layer is an ester of higher fatty acid and lower alcohol. Specifically, the number of carbon atoms is 8 to 23, preferably 10
It is an esterified product of 21 higher fatty acids and an aliphatic alcohol having 1 to 7 carbon atoms. Such higher fatty acid alcohol ester can be used as either a saturated fatty acid ester or an unsaturated fatty acid ester. Specific examples of such higher fatty acid alcohol esters include ethyl caprylate, methyl caprate, propyl laurate, methyl palmitate, ethyl stearate, and other saturated fatty acid alcohol esters, methyl oleate, and ethyl linoleate. An alcohol ester of an unsaturated fatty acid such as propyl linolenate, glycerin linoleate, glycerin linolenate, or
Flaxseed oil, eno oil, tung oil, sesame oil containing these,
Rapeseed oil, cottonseed oil, camellia oil, olive oil, castor oil,
Examples thereof include vegetable oils such as coconut oil and safflower oil, and beef tallow oil.

(C) Coat (impregnation) The recording paper of the present invention comprises a polyolefin film obtained by coating the surface (one side or both sides) of the polyolefin film as the support layer with the alcohol ester of higher fatty acid. It is important to swell the surface of the polyolefin film by impregnating the alcohol ester of higher fatty acid even inside the surface layer of the film. To coat and impregnate the alcohol ester of the higher fatty acid on the surface of the polyolefin-based film, toluene, xylene, or mineral is used when the alcohol ester of the higher fatty acid has a high viscosity and is difficult to apply or impregnate. It is preferable to use various diluents such as spirits. As a method of impregnating such a higher fatty acid alcohol ester into the surface layer of the polyolefin film, various known methods can be adopted. Specific examples of such a method include gravure coating. , Mayer bar coating,
A coating method such as roll coating or blade coating, or a method of immersing and coating / impregnating a polyolefin film in a tank containing an alcohol ester of a higher fatty acid can be used. The coating amount is generally 0.1 to 20.
g / m ^2, preferably in the range of 1 to 3 g / m ^2.
The alcohol ester of the higher fatty acid thus coated is usually contained in the polyolefin film in an amount of 0.1 to 1
Impregnated in an amount of 0% by weight, preferably 1-3% by weight. Further, in the case of the method of diluting with toluene, xylene or the like, after coating, 60 to 150 ° C., particularly 80 to
It is preferable to dry at a temperature of 120 ° C. for about 1 minute. Further, in order to sufficiently permeate, generally 50 to 10
Aging at a temperature of 0 ° C. for 24 hours or more is desirable. 2 to 10M after 1 minute to 1 day after application
Irradiation with an electron beam for RAD is more preferable because curl is significantly reduced.

[II] Production of Heat Sensitive Body The heat sensitive paper such as the heat sensitive recording paper or the heat sensitive transfer recording paper of the present invention has an alcohol ester of a higher fatty acid on the surface (one side or both sides) as shown in FIG. A polyester-based heat-sensitive recording layer or a receptor layer 4 is generally applied to the polyolefin-based film support 2 having a coating layer 3 formed by impregnating the same with a thickness of ² to 12 g / m ² , coating, spraying, etc. It can be manufactured by laminating by the method of.

(1) Thermosensitive recording material (a) Blending component The thermosensitive recording layer formed on the support of the thermosensitive recording material contains a color former and a color former. With respect to the combination of the color former and the color former contained in the heat-sensitive recording layer, any combination can be used as long as they are brought into contact with each other to cause a color reaction, for example, a colorless or pale basic dye and an inorganic dye. Or a combination with an organic acidic substance, or higher fatty acid metal salts such as ferric stearate and phenols such as gallic acid, and a combination of a diazonium compound, a coupler and a basic substance is applied. It is possible.

Coloring Agents Various types of basic dyes which are colorless or light-colored and which are blended in the heat-sensitive recording layer as a coloring agent are known, for example, 3,3-bis (p-dimethylaminophenyl) -6-dimethyl. Aminophthalide, 3,3-bis (p-dimethylaminophenyl) phthalide, 3- (p-dimethylaminophenyl) -3- (1,2-dimethylindol-3-yl) phthalide, 3- (p-dimethyl Aminophenyl)-
3- (2-methylindol-3-yl) phthalide,
3,3-bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide,
3,3-bis (2-phenylindol-3-yl)-
6-Dimethylaminophthalide, 3-p-dimethylaminophenyl-3- (1-methylpyrrol-3-yl) -6
-Dimethylaminophthalide and other triallylmethane dyes, 4,4'-bis-dimethylaminobenzhydryl benzyl ether, N-halophenyl-leuco auramine, N-2,4,5-trichlorophenyl leuco auramine, etc. Diphenylmethane dyes, benzoyl leuco methylene blue, p-nitrobenzoyl leuco methylene blue and other thiazine dyes, 3-methyl-spiro-dinaphthopyran, 3-ethyl-spiro-dinaphthopyran, 3-
Phenyl-spiro-dinaphthopyran, 3-benzyl-spiro-dinaphthopyran, 3-methyl-naphtho- (6'-
Spiro dyes such as (methoxybenzo) spiropyran, 3-propyl-spiro-dibenzopyran, lactam dyes such as rhodamine-B anilinolactam, rhodamine (p-nitroanilino) lactam and rhodamine (o-chloroanilino) lactam, 3-dimethyl Amino-7-methoxyfluorane, 3-diethylamino-6-methoxyfluorane, 3-diethylamino-7-methoxyfluorane,
3-diethylamino-7-chlorofluorane, 3-diethylamino-6-methyl-7-chlorofluorane, 3-
Diethylamino-6,7-dimethylfluorane, 3-
(N-Ethyl-p-toluidino) -7-methylfluorane, 3-diethylamino-7-N-acetyl-N-methylaminofluorane, 3-diethylamino-7-N-methylaminofluorane, 3-diethylamino- 7-dibenzylaminofluorane, 3-diethylamino-7-N
-Methyl-N-benzylaminofluorane, 3-diethylamino-7-N-chloroethyl-N-methylaminofluorane, 3-diethylamino-7-N-diethylaminofluorane, 3- (N-ethyl-p-toluidino) -
6-methyl-7-phenylaminofluorane, 3- (N
-Cyclopentyl-N-ethylamino) -6-methyl-
7-anilinofluorane, 3- (N-ethyl-p-toluidino) -6-methyl-7- (p-toluidino) fluorane, 3-diethylamino-6-methyl-7-phenylaminofluorane, 3-diethylamino -7- (2-carbomethoxyphenylamino) fluorane, 3- (N-
Ethyl-N-isoamylamino) -6-methyl-7-phenylaminofluorane, 3- (N-cyclohexyl-
N-methylamino) -6-methyl-7-phenylaminofluorane, 3-piperidino-6-methyl-7-phenylaminofluorane, 3-piperidino-6-methyl-7
-Phenylcyminofluorane, 3-diethylamino-6
-Methyl-7-xylidinofluorane, 3-diethylamino-7- (o-chlorophenylamino) fluorane,
3-dibutylamino-7- (o-chlorophenylamino) fluorane, 3-pyrrolidino-6-methyl-7-p
-Butylphenylaminofluorane, 3-N-methyl-
N-tetrahydrofurfurylamino-6-methyl-7-
Examples thereof include fluoran dyes such as anilinofluorane and 3-N-ethyl-N-tetrahydrofurfurylamino-6-methyl-7-anilinofluorane.

[0013] The inorganic or organic acidic substances in contact with a color developer said basic dye to coloring, various ones are known, for example, activated clay as the inorganic acidic substance, acid clay, attapulgite, bentonite, colloidal Silica, aluminum silicate, etc. are exemplified, and 4-tert-butylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 4-hydroxyacetophenol, 4-tert-octylcatechol, 2,2 ′ are used as organic acidic substances. -Dihydroxydiphenol, 2,2'-methylenebis (4
-Methyl-6-tert-isobutylphenol), 4,
4'-isopropylidene bis (2-tert-butylphenol), 4,4'-sec-butylidene diphenol, 4
-Phenylphenol, 4,4'-isopropylidene diphenol (bisphenol A), 2,2'-methylenebis (4-chlorophenol), hydroquinone, 4,
4'-Cyclohexylidenediphenol, benzyl 4-hydroxybenzoate, dimethyl 4-hydroxyphthalate, hydroquinone monobenzyl ether, novolac type phenolic resins, phenolic compounds such as phenolic polymers, benzoic acid, p-tert-butylbenzoic acid Acid, trichlorobenzoic acid, terephthalic acid, 3-sec-butyl-4-
Hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid, 3,5-dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3-
tert-Butylsalicylic acid, 3-benzylsalicylic acid, 3
-(Α-Methylbenzyl) salicylic acid, 3-chloro-5
-(Α-Methylbenzyl) salicylic acid, 3,5-di-te
rt-Butylsalicylic acid 3-phenyl-5- (α, α-
Aromatic carboxylic acids such as dimethylbenzyl) salicylic acid and 3,5-di-α-methylbenzylsalicylic acid, and the above-mentioned phenolic compounds and aromatic carboxylic acids and, for example, zinc,
Examples thereof include salts with polyvalent metals such as magnesium, aluminum, calcium, titanium, manganese, tin and nickel.

The amount ratio Incidentally, the basic dye (color former) and a color developer may be used in combination of two or more as necessary. Further, the ratio of the basic dye and the coloring agent used is appropriately selected according to the type of the basic dye or the coloring agent used and is not particularly limited, but generally 1 part by weight of the basic dye is used. On the other hand, the coloring agent is used in an amount of 1 to 20 parts by weight, preferably 2 to 10 parts by weight.

(B) Coating liquid A coating liquid containing these substances generally uses water as a dispersion medium,
It is prepared by uniformly or separately dispersing a dye (color former) and a color former with a stirrer / pulverizer such as a ball mill, attritor, or sand mill. In the coating liquid, starches, hydroxyethyl cellulose, methyl cellulose,
Carboxymethyl cellulose, gelatin, casein, gum arabic, polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, diisobutylene / maleic anhydride copolymer salt, styrene / maleic anhydride copolymer salt, ethylene / acrylic acid copolymer salt, A binder such as a styrene / budadiene copolymer emulsion, a urea resin, a melamine resin, an amide resin, and an amino resin is contained in an amount of 2 to 40% by weight, preferably 5 to 25% by weight, based on the total solid content. Further, various auxiliary agents can be added to the coating liquid as needed, and examples thereof include sodium dioctylsulfosuccinate, sodium dodecylbenzenesulfonate, sodium lauryl alcohol sulfate / sodium salt, and fatty acid metal salt. A dispersant, an ultraviolet absorber such as a benzophenone type, other defoaming agent, a fluorescent dye, a coloring dye, a conductive substance and the like are appropriately added. If necessary, waxes such as zinc stearate, calcium stearate, polyethylene wax, carnauba wax, paraffin wax, ester wax, stearic acid amide, stearic acid methylenebisamide, oleic acid amide, palmitic acid amide, palm fatty acid amide, etc. Fatty acid amides of 2,2'-methylenebis (4-methyl-6-tert-
Butylphenol), hindered phenols such as 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole UV absorbers such as 2-hydroxy-4-benzyloxybenzophenone, 1,2-di (3-methylphenoxy) ethane, 1,2-diphenoxyethane, 1-phenoxy-2
-(4-Methylphenoxy) ethane, terephthalic acid dimethyl ester, terephthalic acid dibutyl ester, terephthalic acid dibenzyl ester, p-benzyl-biphenyl, 1,4-dimethoxynaphthalene, 1,4-diethoxynaphthalene, 1-hydroxynaphthoene It is also possible to add esters such as acid phenyl ester, and various known thermoplastic substances and inorganic pigments such as kaolin, clay, talc, calcium carbonate, calcined clay, titanium oxide, diatomaceous earth, fine anhydrous silica and activated clay. it can.

(C) Formation of Thermosensitive Recording Layer The method for producing a thermosensitive recording layer by forming the thermosensitive recording layer on the support is not particularly limited. For example, the above-mentioned blending components may be formed on the support. It can be formed by a method of applying and drying the coating liquid containing the above by air knife coating, blade coating, or the like.
The coating amount of the coating liquid is also not particularly limited, and is usually ² to 12 g / m < ² >, preferably 3 to 10 g / m < ² > dry weight. An overcoat layer may be provided on the heat-sensitive recording layer of the heat-sensitive recording material for the purpose of protecting the heat-sensitive recording layer, and the back surface of the heat-sensitive recording material may be treated with an adhesive to form an adhesive label. Various known techniques in the field of manufacturing thermal recording media can be added as necessary.

(2) Heat-sensitive transfer recording material The recording paper of the present invention can be used not only as the heat-sensitive recording paper but also as a heat-sensitive transfer recording paper (heat-transfer image receiving sheet). The heat-sensitive transfer recording paper has a receiving layer formed on the surface of the support, which is capable of receiving the vaporized dye from the coloring material layer of the thermal transfer sheet and transferring the image when heated by a thermal head. Has been done. (a) Receptor layer The receptor layer is formed by mixing and dispersing a polymer organic solvent solution, and optionally a filler selected from an inorganic filler and an organic filler, to form a receptor layer-forming coating solution on the support. It can be formed by applying and drying on top. Organic Solvent Solution of Polymer As the organic solvent solution of the polymer, a solution in which a polymer such as saturated polyester, polyamide, vinyl chloride / vinyl acetate copolymer or the like is dissolved in an organic solvent such as toluene or methyl ethyl ketone can be mentioned. Filler As the filler , fine powder silica, calcium carbonate,
Examples thereof include inorganic fillers such as aluminosilicate, talc, and clay, and fillers selected from organic fillers such as benzoguanamine / formalin condensate and urea / formalin condensate. The blending ratio of the polymer component and the filler component is appropriately selected in consideration of the coating suitability such as viscosity and fluidity and the color density of the transferred image. In addition, if necessary, an anti-blocking agent, an antioxidant, an ultraviolet absorber, an antistatic agent, a dye dyeing auxiliary agent, etc. may be mixed in the paint for forming the receiving layer in advance, or the surface of the receiving layer may be sprayed or coated. It can be added by a method.

[0018]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples below. The parts and% in the examples are on a weight basis unless otherwise specified, and the evaluation was carried out by the following evaluation methods. <Evaluation method> A thermal transfer paper 1 on which a curl height is to be measured is thermally transferred with an image by a Hitachi color video printer VD-50 (trade name), and is 200 mm in the MD (machine direction) direction.
Width, 120m in TD (traverse direction) direction
Cut into rectangles of m width, this is 23 ℃, humidity 50
% Of 24 on the flat surface 5 as shown in FIG.
The curl height was determined by allowing the sheet to stand for a time and measuring the floating height h (mm) of the thermal transfer paper at that time.

Example 1 (1) Production of support layer for thermal transfer recording body (a) Melt index (MI) 0.8 g / 10 minutes,
After blending 75% by weight of polypropylene having a crystallinity of 50% and a melting point of 166 ° C. by the DSC method with 25% by weight of calcium carbonate having an average particle size of 1.5 μm, and melt-kneading with an extruder set at 270 ° C., The sheet was extruded in a sheet shape from a die and cooled by a cooling device to obtain an unstretched sheet. And
After heating this sheet at 150 ° C., it was stretched 5 times in the longitudinal direction to prepare a base layer (B) which was uniaxially stretched only. (B) Polypropylene 55 having MI of 4.0 g / 10 minutes, crystallinity of 48% by DSC method and melting point of 167 ° C.
45% by weight of calcium carbonate having an average particle size of 1.5 μm was blended with 50% by weight, melt-kneaded with an extruder set at 220 ° C., extruded in a sheet form from a die, and front and back layers before uniaxially stretching. (A) and (C) were prepared and laminated on both sides of the base layer of the uniaxially stretched sheet obtained in (a) above. Then, after cooling to 60 ° C., it is heated again to 162 ° C., stretched to 7.5 times in the transverse direction with a tenter, and then 1
Annealing treatment at 67 ° C., cooling to 60 ° C., slitting of the ears, three layers (A / B / C: thickness 40 μm / 7
A synthetic paper having micropores with a structure of 0 μm / 40 μm) was obtained. The opacity of this synthetic paper was 96%. Then, one side of the support layer made of this synthetic paper was coated with ethyl stearate at a coating amount of 3 g / m ² and left for 1 day to impregnate the support layer with ethyl stearate.

(2) Formation of Receptor Layer Preparation of Image Receiving Layer Forming Composition for Thermal Transfer Recording An image receiving layer forming composition for thermal transfer recording comprising the following components is coated on the above-mentioned support layer to obtain a dry thickness. A heat-sensitive transfer recording paper on which a 4 μm receiving layer was formed was obtained. [Image-Receiving Layer-Forming Composition for Thermal Transfer Recording] Saturated polyester (Toyobo Pylon 200Tg 76 ° C.) 5.3 parts by weight (Toyobo Pylon 290Tg 77 ° C.) 5.3 parts by weight Vinylite VYHH (Union Carbide vinyl chloride / vinyl acetate co-weight) 4.5 parts by weight Titanium oxide (KA-10 manufactured by Titanium Industry) 1.5 parts by weight Amino-modified silicone oil (KF-393 manufactured by Shin-Etsu Silicon) 1.1 parts by weight Epoxy-modified silicone oil (X-22 manufactured by Shin-Etsu Silicon) -343) 1.1 Evaluation by thermal transfer on the thermal transfer recording paper Hitachi Color Video Printer VD
Printing was performed by thermal transfer at -50 (trade name). The curl after printing was measured, and the results are shown in Table 1.

(3) Formation of Thermosensitive Recording Layer Preparation of Thermosensitive Recording Layer Forming Composition A thermosensitive recording layer forming composition comprising the following components was applied to the above-mentioned support layer, and a thermosensitive recording layer having a thickness of μm when dried was used. A thermosensitive recording paper on which a recording layer was formed was obtained. [Composition for forming thermosensitive recording layer] <Preparation of solution A> 3- (N-methyl-N-cyclohexylamino) -6-methyl-7-anilinofluorane 4.0 parts by weight 3-diethylamino-7-orthochloroanilino Fluoran 1.0 part by weight Hydroxyethyl cellulose 5% aqueous solution 20.0 parts by weight A composition of this ratio is ground with a sand grinder to an average particle size of 2 μm. <Preparation of solution B>4,4'-isopropylidenediphenol (bisphenol A) 25.0 parts by weight Stearic acid amide 15.0 parts by weight Hydroxyethyl cellulose 5% aqueous solution 140.0 parts by weight A composition of this ratio is made with a sand grinder. Average particle size 2μ
Grind to m. Formation of color forming layer 70 parts by weight of talc 50% aqueous dispersion, 25 parts by weight of solution A, B
180 parts by weight of the liquid and 240 parts by weight of a 5% aqueous solution of hydroxyethyl cellulose as a binder are mixed to obtain a coating liquid. Next, the thermosensitive color forming layer-forming liquid was applied to the surface of the support with a Mayer bar so that the coating amount after drying was 7 g / m ^2, and dried to obtain the thermosensitive recording paper of the present invention. Thermal recording This thermal recording paper can be printed on TOSHIBA MEDICAL SONOPRINTER T
P-8300 (trade name) was used to print solid black by heat. The curl after printing was measured, and the results are shown in Table 1.

Example 2 Yupo FPG150 (thickness: 150 μm) manufactured by Oji Yuka Synthetic Paper Co., Ltd. was used as a support for the thermal transfer recording paper, and the amount of ethyl stearate applied on one side of the support was dry. Three
The coating was applied at a rate of g / m ₂ and left for 1 day to impregnate the support with ethyl stearate. Hereinafter, a recording sheet was obtained in the same manner as in Example 1.

Examples 3 to 5 In the production of the support layer for heat-sensitive transfer recording paper of Example 2,
The same procedure as in Example 2 was repeated except that methyl stearate applied to the support layer was replaced with methyl oleate, linseed oil, and tung oil. The results are shown in Table 1.

Examples 6 to 7 Recording sheets were prepared in the same manner as in Examples 3 to 4 except that the synthetic paper was coated with methyl oleate or linseed oil, and then irradiated with an electron beam of 5 megarads. Obtained.

Comparative Example 1 Production of Thermal Transfer Recording Paper As a support layer of the thermal transfer recording paper, Yupo FPG150 (thickness 150 μm) manufactured by Oji Yuka Synthetic Paper Co., Ltd. was used,
The image-receiving layer-forming composition containing the above components was directly coated on one surface of the support layer to obtain a heat-sensitive transfer recording paper on which a receiving layer having a thickness of 4 μm when dried was formed. This thermal transfer recording paper was subjected to thermal transfer in the same manner as in Example 1 to measure the curl height after printing. The results are shown in Table 1.

[0026]

[Table 1]

[0027]

Since the recording paper of the present invention has a coating layer formed by swelling the surface of the support layer with an alcohol ester of a higher fatty acid, the support layer is formed even by heating with a thermal head. It does not easily deform and curls easily.
Moreover, since the surface is smooth and the adhesion to the thermal head is excellent, an extremely excellent image can be formed.

[Brief description of drawings]

FIG. 1 is a sectional view of a thermal paper according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a method for measuring the curl height of a printed matter according to the present invention.

[Explanation of symbols] 1 recording paper 2 polyolefin film layer 3 coating layer 4 thermal recording layer or thermal transfer image receiving layer 5 flat surface h curl height

Claims (2)

[Claims] 1. A recording paper comprising a support layer comprising a polyolefin film and a heat-sensitive recording layer or a heat-sensitive transfer image-receiving layer formed on the support layer, wherein one or both sides of the support layer is impregnated with an alcohol ester of a higher fatty acid. A recording paper having a coating layer formed thereon. 2. The recording paper according to claim 1, wherein the coating layer is obtained by coating and impregnating an alcohol ester of an unsaturated higher fatty acid and impregnating it with an electron beam.