JP2012056193A - Hard coat film and decorative hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film which makes direct printing on the film possible by a thermal transfer printing method and in which no interference fringe is generated after printing and a decorative hard coat film.SOLUTION: In the hard coat film in which a hard coat layer is formed on at least one side of a base material, an image receiving layer is formed on the hard coat layer by thermal transfer from an image receiving layer transfer sheet with the image receiving layer formed on a support. The image receiving layer is made to contain 1-13 wt.% of fine inorganic particles.

Description

  The present invention relates to a hard coat film capable of thermal transfer printing directly on the surface of the hard coat.

  In recent years, there are many cases where a hard coat film is attached to an outermost surface of a mobile device such as a mobile phone or a smartphone via an adhesive layer for the purpose of preventing scratches. At the same time, in order to improve the design of mobile devices, there is an increasing number of cases where printing is performed on the surface opposite to the hard coat layer of the hard coat film and decorated on the display of the mobile device (Patent Document 1). .

  When the hard coat film is attached to a mobile device having a touch panel function, the surface quality of the hard coat film is deteriorated by a heat treatment step (hereinafter referred to as annealing treatment) applied during the manufacturing process of the touch panel. This is because the hard coat layer shrinks simultaneously with the shrinkage of the PET film as the substrate by heating. That is, when a hard coat film coated with a hard coat on only one side is used, the surface quality deterioration of the hard coat film generated in the heating process is likely to adversely affect the function of the touch panel. Therefore, the hard coat film that is adhered to the outermost surface of the display unit of a mobile device having a touch panel function is generally a film obtained by performing hard coat processing on both surfaces of a base material. Therefore, in the case of decorating, a method of directly printing on the back side hard coat surface by a screen printing method or the like is used.

Japanese Patent No. 4021925 Japanese Patent Application No. 2009-271701

  Recently, due to diversification of customer requests and shorter delivery times, the number of units produced per mobile device has been decreasing, and it has been pointed out that decorating using the screen printing method mentioned above causes cost increases. Has been. For this reason, various studies have been made to decorate the hard coat layer by a method instead of the screen printing method.

  A particularly promising method is a thermal transfer printing method using a thermal transfer printer. This method is a printing method that is excellent in on-demand printability and can be used for various designs at low cost. However, although thermal transfer printing on the hard coat layer has been studied for some time, the adhesion between the hard coat layer and the thermal transfer ribbon cannot be obtained, and satisfactory quality cannot be obtained. As described in Patent Document 2, the present inventor sets the surface tension of the hard coat layer of the hard coat film to 35 mN / m or more, and prints the decorative hard coat film on the hard coat layer surface with a thermal transfer ribbon. I was able to get it.

  However, when black solid printing was performed with a thermal transfer ribbon, very fine interference fringes appeared.

  In order to solve the above-mentioned problem of interference fringes, the present invention does not generate interference fringes even when directly printed on a hard coat layer by a thermal transfer printing method using a thermal transfer printer, and is based on an annealing process applied during the touch panel manufacturing process. The present invention provides a decorated hard coat film that does not deteriorate the surface quality of the hard coat film. Furthermore, the thing with the high transparency of the hard coat film in the place which is not printing is provided.

The first invention is a hard coat film in which a hard coat layer is provided on at least one surface of a substrate, and the image receiving layer is provided on the hard coat layer from an image receiving layer transfer sheet provided with at least an image receiving layer on a support. It is a hard coat film provided by thermal transfer.
A second invention is the hard coat film according to the first invention, wherein the image-receiving layer contains a thermoplastic resin as a main component.
A third invention is the hard coat film according to the second invention, wherein the thermoplastic resin has a melt viscosity in the range of 5 to 1000 P / 140 ° C.
A fourth invention is the hard coat film according to the first to third inventions, wherein the image receiving layer contains 1 to 13% by weight of inorganic fine particles.
The fifth invention is a decorative hard coat film in which the image receiving layer surface of the hard coat film of the first to fourth inventions is decorated by a thermal transfer printing method, and a colored layer containing an acrylic resin on a substrate as a thermal transfer ribbon. It is a decorated hard coat film using a provided thermal transfer ribbon.

  By using the hard coat film of the present invention, a decorative hard coat film that is capable of direct thermal transfer printing on the film, has no interference fringes, and does not deteriorate the surface quality of the hard coat film due to the annealing treatment applied during the touch panel manufacturing process. I can do it. About the place which is not printed, a highly transparent decorative hard coat film is made.

  If the base material used by this invention is a film which consists of various plastics, it will not specifically limit. Examples include films made of polyolefin, polyester, polyamide, polycarbonate, fluororesin, polyphenylene oxide, polyimide, polyamideimide, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, cellulose resin, etc. It is not limited to. A polyester film is preferably used from the viewpoints of handleability, improvement of adhesive strength with the adhesive layer, and cost. The thickness of the substrate may be appropriately selected according to the use, but usually a thickness in the range of 4 to 400 μm is used.

The compound used in the hard coat layer of the present invention is preferably formed mainly from a compound that polymerizes by ionizing radiation, and forms a compound having a (meth) acryloyl group that forms a radical polymerization reaction or a cationic polymerization reaction. A compound is preferred. The compound having a (meth) acryloyl group means a compound having one or more (meth) acryloyl groups in the molecule, and may be a monomer or an oligomer.

  In the present invention, the acryloyl group and the methacryloyl group are collectively referred to as a (meth) acryloyl group. That is, the compound having a (meth) acryloyl group may be a compound having only an acryloyl group, or a compound having only a methacryloyl group, and having both an acryloyl group and a methacryloyl group. It may be. The same applies to (meth) acrylates and (meth) acrylic esters described below.

  Examples of the compound having a (meth) acryloyl group according to the present invention include monomers or oligomers of polyfunctional (meth) acrylates and monofunctional (meth) acrylates described below.

  Multifunctional (meth) acrylates include trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) Acrylate, dipentaerythritol hexa (meth) acrylate, glycerin tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, ethylene glycol di (meth) acrylate, 1,3-butanediol di ( (Meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, die Renglycol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, bis (2-hydroxyethyl) isocyanurate di (meth) acrylate, and ethylene oxide to these starting alcohols Or propylene oxide adduct poly (meth) acrylates, oligoester (meth) acrylates having two or more (meth) acryloyl groups in the molecule, oligoether (meth) acrylates, oligourethane (meth) acrylates, And oligoepoxy (meth) acrylates.

Monofunctional (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, acrylonitrile, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, Phenoxyethyl (meth) acrylate, 2-phenoxy-2-hydroxypropyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate, glycerol mono (meta) ) Acrylate, glycidyl (meth) acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, tricyclodecanyl (meth) acrylate, disic Pentenyl (meth) acrylate, n-butyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, Dodecyl (meth) acrylate, n-stearyl (meth) acrylate, benzyl (meth) acrylate, phenol ethylene oxide modified (n = 2) (meth) acrylate, nonylphenol propylene oxide modified (n = 2.5) (meth) acrylate, Half (meth) acrylate, furfuryl (meta) of phthalic acid derivatives such as 2- (meth) acryloyloxyethyl acid phosphate and 2- (meth) acryloyloxy-2-hydroxypropyl phthalate Acrylate, carbitol (meth) acrylate, benzyl (meth) acrylate, butoxyethyl (meth) acrylate, allyl (meth) acrylate 2-acryloyloxyethyl acid phosphate monoester, cyclohexanedimethanol monoacrylate, 4-hydroxybutyl acrylate, acryloyl Examples include morpholine, 4-glycidyloxybutyl acrylate, diacetone acrylamide and the like.
These compounds having a (meth) acryloyl group may be used alone or in combination of two or more.

On the other hand, an epoxy resin is usually used as a compound that forms cationic polymerization. Examples of the epoxy resins include compounds obtained by epoxidizing polyphenols such as bisphenol resins and novolac resins with epichlorohydrin, etc., and compounds obtained by oxidizing a linear olefin compound or a cyclic olefin compound with a peroxide or the like. Etc.

Examples of the photopolymerization initiator used in the ionizing radiation polymerization reaction include radical polymerization type compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, and acetophenone. Dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p- Phenylbenzophenone, 4,4′-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylamine benzoate, and the like. Examples of photopolymerization initiators for cationic polymerization type compounds include oniums such as aromatic sulfonium ions, aromatic oxosulfonium ions, aromatic iodonium ions, tetrafluoroborate, hexafluorophosphate, hexafluoroantimonate, hexa The compound which consists of anions, such as fluoroarsenate, is mentioned. These may be used alone or in combination of two or more, and the blending amount is usually selected in the range of 0.2 to 10 parts by mass with respect to 100 parts by mass of the polymerizable compound. It is.

In addition to the ionizing radiation curable compound, a thermoplastic polymer can be added as long as the hard coat property is not significantly impaired. Examples of the thermoplastic polymer include acrylic resins, vinyl acetate resins, epoxy resins, polyester resins, polycarbonate resins, butyral resins, gelatin, cellulose resins, polyamide resins, vinyl chloride resins, urethane resins. Examples thereof include resins.

Furthermore, if necessary, an antifoaming agent, a coating property improver, a thickener, a surfactant, an organic lubricant, an organic fine particle, an inorganic fine particle, an antioxidant, an ultraviolet absorber, a foaming agent, a dye, It may contain pigments, antistatic agents and the like.

The thickness of the hard coat coating film is 1 μm or more and 20 μm or less, preferably 3 μm or more and 15 μm or less. If it is less than this range, sufficient hard coat properties cannot be obtained, and the coating film tends to be damaged. On the other hand, exceeding this range leads to an increase in cost. Moreover, when a hard coat is applied on both sides, it is preferable to suppress the difference in film thickness between the two layers within 30%. If this range is exceeded, curling of the hard coat film will increase, which may adversely affect the handling of the next process transition, and may adversely affect the touch panel function when the touch panel is assembled.

  As the support for the image-receiving layer transfer sheet, films made of the same various plastics as those mentioned for the base material used in the hard coat film can be used. A polyester film is preferable from the viewpoints of handleability, heat resistance, and cost. Usually, the thickness is in the range of 1 to 200 μm. More preferably, one having a thickness of 2 to 25 μm is used.

  The support on the opposite side provided with the image receiving layer may be provided with a heat resistant slipping layer made of silicone resin. The thickness of the heat resistant slipping layer is in the range of 0.05 to 1.0 μm.

  The image receiving layer of the image receiving layer transfer sheet is mainly composed of a thermoplastic resin. Examples of the thermoplastic resin include olefin copolymer resins such as ethylene-vinyl acetate copolymer and ethylene-acrylate ester copolymer, polyamide resin, polyester resin, epoxy resin, polyurethane resin, and vinyl chloride resin. Resins, cellulose resins, vinyl alcohol resins, petroleum resins, phenol resins, styrene resins, vinyl acetate resins, natural rubber, styrene-butadiene rubber, isoprene rubber, chloroprene rubber and other elastomers, polyisobutylene, polybutene 1 type or 2 types or more, such as, are mentioned.

  In addition to the thermoplastic resin, a thermosetting resin or a photocurable resin may be contained. Moreover, you may add waxes as needed. In particular, when a thermosetting resin or a photocurable resin is added, the strength of the image receiving layer is increased, and surface quality deterioration due to annealing treatment (150 ° C. × 60 minutes treatment) can be suppressed. As a photocurable resin, the monomer and photoinitiator which were mentioned by the said hard-coat layer are mentioned.

When the thermal transfer property of the image receiving layer is poor, a release layer may be provided between the support and the image receiving layer. Examples of the material for the release layer include various waxes and thermoplastic resins. It is preferable to mix a wax as a main component. Examples of waxes include natural waxes such as wax, beeswax, carnauba wax, candelilla wax, montan wax, and ceresin wax; petroleum waxes such as paraffin wax and microcrystalline wax; oxidized wax, ester wax, polyethylene wax, and fisher Synthetic waxes such as Tropsch wax and α-olefin-maleic anhydride copolymer wax; higher fatty acids such as myristic acid, palmitic acid, stearic acid and behenic acid; higher aliphatic alcohols such as stearyl alcohol and docosanol; higher fatty acid monoglycerides, Esters such as fatty acid esters of sugar and fatty acid esters of sorbitan; one or two amides such as stearamide, oleylamide, and bisamides Above it can be used.

Examples of the thermoplastic resin include olefin-based copolymer resins such as ethylene-vinyl acetate copolymer and ethylene-acrylate ester copolymer, polyamide-based resin, polyester-based resin, epoxy-based resin, polyurethane-based resin, and vinyl chloride-based resin. Resins, cellulose resins, vinyl alcohol resins, petroleum resins, phenol resins, styrene resins, vinyl acetate resins, natural rubber, styrene-butadiene rubber, isoprene rubber, chloroprene rubber and other elastomers, polyisobutylene, polybutene 1 type, or 2 or more types.

  In order to prevent interference fringes due to thermal transfer printing, the thermoplastic resin should have a melt viscosity in the range of 5 to 1000 P / 140 ° C. If it is less than the above range, the image-receiving layer is softened during annealing, and surface quality deterioration is likely to occur. If the range is exceeded, the interference fringe reduction effect is reduced. When direct thermal transfer printing is performed on a hard coat layer having no image receiving layer, an extremely thin air layer appears at the interface between the colored layer and the hard coat layer. Therefore, it is considered that interference fringes are generated. By providing the image receiving layer, the adhesion between the colored layer and the image receiving layer is increased, and this air layer is considered to disappear.

  The preferable melt viscosity of the thermoplastic resin is in the range of 10 to 900 P / 140 ° C. A more preferable range of melt viscosity is 100 to 800 P / 140 ° C. (Measured with MR300V ll solid meter manufactured by UBM Co., Ltd. using dynamic viscoelasticity measurement mode and cone plate) The thickness of the image receiving layer is preferably in the range of 0.05 to 1 μm. If it is less than the above range, the interference fringe reduction effect is small. Beyond the above range, it is economically inefficient. A more preferable range of thickness is 0.1 to 0.8 μm.

  In order to prevent surface quality deterioration due to the annealing treatment and to improve the printing quality, it is preferable to contain 1 to 13% by weight of inorganic fine particles in the image receiving layer. If it is less than the above range, the surface quality deterioration preventing effect is small. When the above range is exceeded, the image receiving characteristics of thermal transfer printing are lowered, and the print quality is liable to deteriorate. More preferably, it is 1.5 to 10% by weight.

  Inorganic fine particles include single oxide particles such as silica, alumina, zirconia, ceria, yttria, boronia, magnesia, calcia, ferrite, amorphous titania, and hafnia; and composite oxides such as barium titanate and calcium silicate And more preferably silica fine particles. These inorganic fine particles are preferably in the form of an aqueous colloid using water as a dispersion medium; or an organosol dispersed colloidally in a hydrophilic solvent such as ethyl alcohol, isopropyl alcohol, or ethylene glycol, and particularly preferably colloidal silica. It is.

  According to a preferred embodiment of the present invention, the inorganic fine particles have an average particle size in the range of 5 to 40 nm, more preferably in the range of 5 to 30 nm, and still more preferably in the range of 10 to 30 nm. When the average particle size is less than 5 nm, it is difficult to prevent surface quality deterioration of the annealing process. When the average particle diameter exceeds 40 nm, irregularities appear on the surface of the image receiving layer, resulting in a problem that transparency as a hard coat film is lowered.

  The surface roughness of the image receiving layer is preferably an average roughness Ra in the range of 0.001 to 0.06 μm. Making it less than the above range is difficult in production. If the above range is exceeded, irregularities appear on the surface of the image receiving layer after thermal transfer, and the transparency of the hard coat film decreases. The surface roughness of the image receiving layer is more preferably in the range where the average roughness Ra is 0.005 to 0.04 μm. The decrease in transparency appears as an increase in the haze of the film. When the average roughness is exceeded, the haze of the film tends to exceed 1%, and the transparency quality as an optical film is deteriorated.

  As a method for thermally transferring the image receiving layer of the image receiving layer transfer sheet to the surface of the hard coat layer, there are a method of performing thermal transfer with a thermal transfer printer, or a method of heating at least one roll in two rolls and passing between the two rolls. . Alternatively, there is a method in which the image receiving layer surface of the image receiving layer transfer sheet and the hard coat layer surface of the hard coat are overlapped and hot pressed. The support after the image-receiving layer transfer is peeled off.

In order to decorate the hard coat film, at least one surface is decorated using a screen printing method, gravure printing method, pad printing method, offset printing method, inkjet printing method, thermal transfer printing method, etc. Among them, the thermal transfer printing method is particularly preferable because it is excellent in small-lot productivity, on-demand property, printing diversity, and the like. When printing on the hard coat surface by the thermal transfer printing method, interference fringes do not occur if an image receiving layer is provided on the hard coat layer.

What is necessary is just to use the thermal transfer ribbon produced by the well-known technique for the thermal transfer ribbon used for the decoration by the thermal transfer printing method of this invention. The thermal transfer ribbon is obtained by providing a colored layer on a substrate. The colored layer is composed of a binder and a color material. In particular, when an acrylic resin is contained as a binder, thermal transfer to the image receiving layer is improved. Examples of the acrylic resin include polymers and copolymers in which at least one selected from (meth) acrylic acid methyl ester resin, (meth) acrylic acid ethyl ester resin, (meth) acrylic acid butyl ester resin and the like is included in the structure. It is preferable to become. When the acrylic resin is contained at least 10% by weight or more in the binder, the thermal transfer property is excellent. If the content is less than the above range, the releasability between the ink and the substrate is lowered, peeling sound is generated during printing, or the primary color is peeled off during secondary color printing, which is called collect during overprinting. Transfer defects are likely to occur. A more preferable content is 20 to 80% by weight, and a particularly preferable content is 40 to 60% by weight.

Examples of other binders include wax and thermoplastic resin. As the wax and the thermoplastic resin, those exemplified in the image-receiving layer transfer sheet can be used.

As a color material, organic and inorganic pigments and / or dyes can be used in addition to carbon black.
As the base material of the thermal transfer ribbon, a polyethylene terephthalate film having a thickness of 2 to 9 μm is preferably used. On the opposite surface of the colored layer, a heat-resistant slip layer made of silicone resin is provided.

The thickness of the colored layer is preferably in the range of 0.1 to 5.0 μm, more preferably 0.3 to 2.0 μm. If it is less than the above range, the print density will be insufficient. The thermal transfer ribbon can be constituted by coating and drying a colored layer ink on a substrate.

The present invention will be described more specifically with reference to the following examples. In addition, this invention is not limited by these Examples.
[Formation of thermal transfer ribbon]
The following colored ink was coated with a dry film thickness of 1 μm on the front side of a 4.5 μm thick PET film provided with a heat resistant slipping layer on the back surface to form a thermal transfer ribbon.
Dianal BR83 (acrylic resin, manufactured by Mitsubishi Rayon) 5 parts by weight Araldite AER6071 (epoxy resin, manufactured by Ciba Geigy) 5 parts by weight LFF MA-7 (carbon black, Mitsubishi Chemical) 10 parts by weight Dispersant 1 part by weight MEK 79 parts by weight

[Formation of hard coat film]
A hard coating layer having a thickness of 5 μm was formed by coating 5 μm each of the following hard coating agent on both sides of optical PET having a thickness of 100 μm, irradiating ultraviolet rays with an accumulated light amount of 500 mj / cm ² , respectively, and curing the coating film.
Light ester TMP (acrylate monomer, manufactured by Kyoeisha) 20 parts by weight NK oligo U-4HA (urethane acrylate, manufactured by Shin-Nakamura Chemical) 18.5 parts by weight Irgacure 184 (photoinitiator, manufactured by Ciba Specialty Chemicals) 1.5 parts by weight MEK 60 parts by weight

[Formation of image-receiving layer transfer sheet]
The back surface of a 6 μm thick PET film is provided with a 0.2 μm thick heat-resistant slip layer, and the surface side of the PET film is coated with 0.5 μm of the following image receiving layer coating agent to transfer the image receiving layer. A sheet was produced.
[Coating agent 1]
Marproof DN-1L (acrylic resin, manufactured by NOF Corporation) 10 parts by weight Toluene 40 parts by weight IPA 40 parts by weight

The surface of a 6 μm thick PET film provided with a 0.2 μm thick heat-resistant slip layer on the back side of the support was coated with carnauba wax as a release layer to a thickness of 0.1 μm by a hot melt coating method, Further, the image receiving layer coating agent 2-7 shown below was coated on the upper layer to a thickness of 0.5 μm to prepare an image receiving layer transfer sheet.

[Coating agent 2]
Versamide JP550 (polyamide resin, manufactured by Cognis Japan) 10 parts by weight Toluene 70 parts by weight IPA 20 parts by weight
[Coating agent 3]
Diacron ER799 (polyester resin, manufactured by Mitsubishi Rayon) 10 parts by weight MEK 90 parts by weight
[Coating agent 4]
Diacron ER799 (polyester resin, manufactured by Mitsubishi Rayon) 9.25 parts by weight MEK-ST (silica sol, average particle size 15 nm, manufactured by Nissan Chemical Industries) 0.75 parts by weight MEK 90 parts by weight
[Coating agent 5]
Araldite AER6071 (epoxy resin, Ciba Geigy) 10 parts by weight MEK
[Coating agent 6]
Diacron ER799 (polyester resin, manufactured by Mitsubishi Rayon) 8 parts by weight MEK-ST (silica sol, average particle size 15 nm, manufactured by Nissan Chemical) 2 parts by weight MEK 90 parts by weight
[Coating agent 7]
Diacron ER799 (polyester resin, manufactured by Mitsubishi Rayon) 9.5 parts by weight fine particle silica powder (average particle size 0.08 μm) 0.5 parts by weight MEK 90 parts by weight

  Next, using a thermal transfer printer (manufactured in-house), the image receiving layer of the image receiving layer transfer sheet was thermally transferred onto the hard coat layer surface of the hard coat film to produce a hard coat film with an image receiving layer.

The following evaluation was performed about the hard coat film with an image receiving layer produced as mentioned above. Evaluation items and evaluation criteria are as follows.
1. Using an interference fringe thermal transfer printer (manufactured in-house) and the thermal transfer ribbon described above, black solid printing is performed on the image receiving layer coating side of the hard coat film. The degree of interference fringes is visually observed from the opposite side (surface) to the printed surface.
○: No interference fringes are visible Δ: Interference fringes appear thin ×: Interference fringes are clearly visible Surface quality degradation The hard coat film with an image receiving layer produced is cut into a size of 10 cm × 10 cm, left in a constant temperature layer at 150 ° C. for 1 hour, then taken out from the constant temperature layer, and the surface quality of the image receiving layer is confirmed.
5: Very good with no change 4: Good 3: Slight quality degradation occurs 2: Surface quality degradation is noticeable 1: Surface quality degradation is severe, resulting in a completely repelled pattern Print evaluation Using a thermal transfer printer (manufactured in-house), the ink transferability when printing on the image receiving surface of a hard coat film with an image receiving layer at a speed of 25 mm / sec and a printing energy of 40 mj / mm ² is evaluated according to the following criteria. .

5: Very good
4: Good 3: Part of the print is chipped 2: Print chipping is noticeable
1: Cannot print at all. Surface roughness Ra of image-receiving layer after thermal transfer
The surface roughness was measured with a surf coder SE3500 manufactured by Kosaka Laboratory.
5. Hard coat film haze Measured with Nippon Denshoku haze meter NDH2000.
The measurement results and evaluation results are summarized in Table 1 according to the above method.

Table 1

Claims (5)

In the hard coat film in which the hard coat layer is provided on at least one surface of the substrate, the image receiving layer is provided on the hard coat layer by thermal transfer from the image receiving layer transfer sheet having at least the image receiving layer provided on the support. A hard coat film characterized by that. 2. The hard coat film according to claim 1, wherein the image receiving layer contains a thermoplastic resin as a main component. The hard coat film according to claim 2, wherein the thermoplastic resin has a melt viscosity in a range of 5 to 1000 P / 140 ° C. The hard coat film according to claim 1, wherein the image receiving layer contains 1 to 13% by weight of inorganic fine particles. In the decorative hard coat film which decorated the image-receiving layer surface of the hard coat film of Claims 1-4 by the thermal transfer printing method, the thermal transfer ribbon which provided the colored layer containing an acrylic resin on a base material as a thermal transfer ribbon is provided. A decorative hard coat film characterized by being used.