JP2007160669A - Antistatic layer transfer sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antistatic layer transfer sheet which can give antistatic properties to articles of various materials and shapes by giving an antistatic layer containing an antistatic agent by a transfer method, is low in temperature dependency, can maintain the antistatic properties over a long time, is good in stability with the passage of time of the antistatic properties and in transparency, and can give good antistatic properties. <P>SOLUTION: In the antistatic layer transfer sheet in which at least an antistatic layer is formed on a substrate, the antistatic layer is formed from a cationic acrylic resin and made to contain at least one of the resins of a group A consisting of an acrylic polyol resin, a cellulosic resin, a mixture of an acrylic polyol resin and a cellulosic resin, a mixture of a cellulosic resin and an acrylic resin, a mixture of a cellulosic resin and a polyurethane resin, a styrene-acrylic acid resin, a styrene-maleic acid resin, and a rosin-maleic acid resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an antistatic layer transfer sheet. More specifically, the present invention relates to an antistatic layer that can easily impart antistatic treatment properties to articles that cannot be directly imparted with antistatic properties efficiently by using a transfer method. It relates to a transfer sheet.

Many packages such as foods, home appliances, and daily necessities are subjected to antistatic treatment so that dust does not adhere during distribution and storage. In addition to the poor appearance due to the adhesion of dust, electronic electrical products such as TVs (television receivers), personal computers, mobile phones, etc. have the risk of fire due to the discharge of accumulated charges and the failure of electronic components due to the discharge current. In order to prevent this, antistatic treatment is performed. For example, liquid crystal display devices such as personal computers, word processors, and liquid crystal televisions (TVs) are illuminated from the back by a surface light source device (also referred to as a backlight) because the liquid crystal itself does not emit light. A surface light source device emits light from an incident light source from a light exit surface, and further scatters, diffuses, and condenses light to make the brightness of the irradiated surface uniform. It is composed of many optical members such as an adjustment film, an antireflection film, an antiglare film, a touch panel, and a display window material.

When these members are assembled into a display device, cutting waste and environmental dust adhere to the optical member during the processing, assembly, and use as the display device, which adversely affects the display. However, it is difficult to efficiently impart antistatic properties to molded products such as display windows, and for optical members, in addition to antistatic properties, high transparency, low haze, and high hard coat. (Represented by scratch resistance against pencil hardness, steel wool, etc.).

Also, conventional antistatic layers such as surfactants are required to have antistatic properties that are easy to deteriorate in long-term use and high-temperature and high-humidity environments, and are less dependent on humidity and can be maintained for a long period of time. ing.

As described above, the antistatic treatment for various articles is required to maintain antistatic properties over a long period of time with little transparency and humidity dependency, and to efficiently impart antistatic properties to molded products. . Furthermore, high transparency, low haze, and high hard coat properties are also required for articles subjected to antistatic treatment.

Conventionally, as a method for imparting antistatic properties to an article, a method in which an antistatic agent is directly applied to the surface of the article or an antistatic agent is directly added to the article has been mainstream. However, if direct coating is difficult because the surface of the component is uneven, or if it is difficult to add an antistatic agent to the article, an antistatic layer may be transferred to the surface of the article. It was.

As such an antistatic agent, a conductive material such as a metal such as nickel, copper, silver, or conductive carbon such as graphite, or an anionic, cationic, or nonionic surfactant is known. However, while the conductive material has good antistatic performance and stability over time, it has a problem that it is colored to deteriorate transparency. In addition, the surfactant has good transparency, but it shifts to the surface over time, is wiped off with a cloth or washed away with water, etc., and the effect is lowered and lacks stability over time (sustainability). There was a defect, and there was no perfect one that achieved both temporal stability of transparency and antistatic property.

Also, as an attempt to maintain antistatic properties for a long time while maintaining transparency, it is known to polymerize a resin material having a relatively low molecular weight with good antistatic properties into a resin (for example, Patent Documents). 1-2.) However, there are limitations on the types of resins that can be contained, and it is necessary to use a compatibilizer in combination. Further, there is a problem that a considerably large amount of content is required and the cost is high.

Furthermore, it is known to contain an alkali metal salt of a halogen-containing acid such as lithium trifluoromethanesulfonate as an attempt to maintain antistatic properties for a long period while maintaining transparency. (For example, refer to Patent Document 3) However, in the case of lithium trifluoromethanesulfonate, if the content is large, the transition to the surface is large and the appearance is deteriorated and the commercial value is lowered. In addition, there is a drawback in that the appearance becomes poor due to whitening even under high temperature and high humidity.
None of the publications describes improvement of hard coat properties.

JP-A-2-233743 JP-A-3-26756 Japanese Patent Laid-Open No. 7-82411

Accordingly, the present invention has been made to solve such problems. The purpose is to provide an antistatic layer containing an antistatic agent by a transfer method, so that antistatic properties can be imparted to articles of various materials and shapes, and the antistatic properties are low over humidity and long-term. It is an object to provide an antistatic layer transfer sheet that can be maintained and can be imparted with antistatic properties with good antistatic properties over time and excellent transparency. Furthermore, the article to which the antistatic layer is transferred is to provide an antistatic-treated article having both high anti-static properties, high transparency and low haze, and also high hard coat properties.

In order to solve the above problems, an antistatic layer transfer sheet according to the invention of claim 1 is an antistatic layer transfer sheet in which at least an antistatic layer is provided on a base material, and the antistatic layer is made of a cationic acrylic resin. It was made to become.
The antistatic layer transfer sheet according to the invention of claim 2 is such that the antistatic layer further contains at least one group A resin.
Group A resin Acrylic polyol resin, cellulose resin, mixture of acrylic polyol resin and cellulose resin, mixture of cellulose resin and acrylic resin, mixture of cellulose resin and polyurethane resin, styrene-acrylic acid resin, Styrene-maleic acid resin, rosin-maleic acid resin.
The antistatic layer transfer sheet according to the invention of claim 3 is one in which at least an antistatic layer and an adhesive layer are sequentially laminated on the base material of claims 1 and 2.
The antistatic layer transfer sheet according to the invention of claim 4 is such that at least an antistatic layer, a transparent cured resin layer, and an adhesive layer are sequentially laminated on the substrate of claims 1 to 3.

The inventor diligently researched and adopted a method of transferring an antistatic layer provided in a transfer layer of a transfer sheet onto an article, and the antistatic layer is made of a cationic acrylic resin, so that an arbitrary material and shape can be obtained. It was found that the article can be subjected to an antistatic treatment, and both antistatic properties and transparency are compatible, and in addition to this, a specific hard coat property can be expressed, and the present invention has been achieved.

The substrate may be appropriately selected from those used for ordinary transfer sheets, and is not particularly limited, but a flexible film (or sheet) substrate is preferable. Examples of the base material include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymer, ethylene glycol-1,4 cyclohexadimethanol-terephthalic acid copolymer, polyester Polyester resins such as thermoplastic elastomers, polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene-butene copolymers, olefin thermoplastic elastomers, polyolefin resins such as cyclic olefin resins, polyetheretherketone, poly Ether sulfone resin, polyamide resin, fluorine resin, polyvinyl chloride and the like can be used.

Among these, a uniaxial or biaxially stretched polyester resin film is more preferable because of its excellent heat resistance. The thickness of the substrate is usually preferably about 6 μm to 188 μm. In addition, the base material may be colored as long as it has flexibility, and a pattern, a character, etc. may be provided by printing etc.

  Examples of the cationic acrylic resin used in the antistatic layer include acrylic monomers having a cationic group alone or copolymers, and copolymers with other monomers. As an acrylic monomer having a cationic group, For example, a third such as dimethylaminoethyl (meth) acrylate, diethylamino (meth) acrylate, diethanolamino (meth) acrylate, dipropylamino (meth) acrylate, dipropanolamino (meth) acrylate, dibutylamino (meth) acrylate, etc. Examples thereof include (meth) acrylic acid ester monomers having a secondary amino group, or quaternized monomers thereof.

Furthermore, as the cationic acrylic resin, for example, a monomer having a reactive group such as a carboxyl group or a hydroxyl group such as acrylic acid, methacrylic acid, or mono (meth) acrylate of glycols such as ethylene glycol with these acids, Reactivity of glycidyltrimethylammonium chloride, 3-chloro-2-hydroxypropyltrimethylammonium chloride, 3-chloro-2-hydroxypropyltriethanolammonium chloride, glycidyltrimethylammonium chloride, glycidyldimethylbenzylammonium chloride, glycidyldimethylbutylammonium chloride Examples thereof include a monomer alone or a copolymer obtained by reacting a quaternary ammonium salt, or a copolymer with another monomer.

  Among these, the quaternary ammonium salt copolymer represented by the chemical formula shown in (Chemical Formula 1) is preferable.

R, R ₁ , R ₂ , and R ₃ are alkyl groups having 1 or more carbon chains, such as a methyl group, an ethyl group, a propyl group, and a butyl group. M and n are integers of 1 or more.

  In order to reduce the humidity dependence of the antistatic layer, it is preferable to use a quaternary ammonium salt copolymer that does not dissolve in water or alcohol. As such a cationic acrylic resin, various products can be obtained and used under the trade name of Electon from Soken Chemical Co., Ltd., for example.

  One or a plurality of these cationic acrylic resins may be used, which are appropriately dissolved or dispersed in a solvent, applied by a known coating method such as roll coating, gravure coating, bar coating, spray coating, and the like, and dried. An antistatic layer may be formed.

The amount of the cationic acrylic resin in the antistatic layer is in the range of 5 to 80% by weight. If it is less than the above range, the antistatic effect is lowered. When the above range is exceeded, the layer becomes brittle and the strength decreases. The thickness of the antistatic layer is preferably in the range of 0.1 to 1 μm. If it is less than the above range, the antistatic effect is lowered. If the above range is exceeded, the cost increases and the surface strength of the layer decreases.

  In general, it is necessary to provide a release layer between the substrate and the antistatic layer. However, the antistatic layer of the present invention can transfer the antistatic layer by using a cationic acrylic resin without providing a release layer between the substrate and the antistatic layer. That is, the manufacturing cost can be reduced.

  The antistatic layer may be mixed with another binder in order to increase the adhesive force with the transfer target. Other binders include, for example, polyurethane resins, polyester resins, polyvinyl chloride resins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymers, acrylic resins, acrylic polyol resins, polyvinyl alcohol resins, polyvinyl acetals. One or more kinds of resins, copolymers of ethylene and vinyl acetate or acrylic acid, epoxy resins, cellulose resins, styrene-acrylic acid resins, styrene-maleic acid resins, rosin-maleic acid resins can be selected and used.

Among these, the following group A resins can be preferably used because they have good compatibility with the cationic acrylic resin and the film strength of the antistatic layer is not lowered.
Group A resin Acrylic polyol resin, cellulose resin, mixture of acrylic polyol resin and cellulose resin, mixture of cellulose resin and acrylic resin, mixture of cellulose resin and polyurethane resin, styrene-acrylic acid resin, Styrene-maleic acid resin, rosin-maleic acid resin.

The blending ratio of the cationic acrylic resin and the group A resin is preferably 5:95 to 80:20. When the cationic acrylic resin is less than the minimum blending ratio, the antistatic effect is lowered. Exceeding the maximum blending ratio is not preferable because the layer becomes brittle and the strength decreases.

The acrylic polyol resin is a copolymer of a hydroxyl group-containing vinyl monomer and another monomer copolymerizable therewith, and has a hydroxyl value of at least 25. It is preferable to use hydroxyalkyl acrylate as the hydroxyl group-containing vinyl monomer. For example, 2-hydroxyethyl acrylate, 2-hydroxy-n-propyl acrylate, 2-hydroxyisopropyl acrylate, 4-hydroxybutyl acrylate, or the like is used. In addition to such monomers, 2-hydroxyethyl methacrylate, 2-hydroxy-n-propyl methacrylate, 2-hydroxyisopropyl methacrylate or 4-hydroxybutyl methacrylate, N-methylolacrylamide, polyethylene glycol mono (meth) acrylate, etc. These hydroxyl group-containing vinyl monomers can also be used alone or in combination. Many other monomers having copolymerizability with the above-mentioned monomers are known, but typical examples are methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth). ) Acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and other (meth) acrylic acid esters; styrene, vinyltoluene, α-methylstyrene, etc. Styrene-based monomers; vinyl esters such as vinyl acetate and vinyl propionate; oxirane group-containing ethylenically unsaturated monomers such as glycidyl (meth) acrylate; acrylonitrile, methacrylonitrile, N-butoxymethylacrylamide, acrylamide Acrylic acid, Methacrylic acid, a phosphoric acid acrylate, etc., can be used in combination one kind or two or more kinds. The number average molecular weight of the acrylic polyol is in the range of 3000 to 20000. The acrylic polyol may be a 100% solid containing no solvent, but a solution with an organic solvent is usually suitable for practical use. An acrylic polyol can be used individually or in combination of 2 or more types.

Examples of the cellulose resin include nitrified cotton, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, methyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and the like. Among these, nitrified cotton and cellulose acetate butyrate can be particularly preferably used. The nitrified cotton is preferably 2 second cotton to 1/16 second cotton, and the cellulose acetate butyrate is preferably 0.5 to 2 seconds.

Acrylic resins include, for example, acrylic esters such as methyl acrylate, ethyl acrylate, and butyl acrylate, homopolymers of methacrylic esters such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate, and acrylic esters. Mention may be made of copolymers with methacrylic acid esters, acrylic acid esters, copolymers of methacrylic acid esters with styrene, vinyltoluene, acrylamide, acrylic acid, methacrylic acid and the like.

The polyurethane resin is a resin obtained by a reaction between a polyhydric alcohol (polyol) and a polyvalent isocyanate (polyisocyanate). Examples of the polyhydric alcohol include polyhydric alcohols such as ethylene glycol, trimethylolpropane, pentaerythritol, glycerin, α-methylglucoside, sorbitol, dipentaerythritol, EO, PO, 1,2-, 2,3- or 1 , 3-butylene oxide, styrene oxide, α-olefin oxide having 6 to 18 carbon atoms, alkylene oxide such as epichlorohydrin (2 to 18 carbon atoms of alkylene group), polyoxyalkylene polyol, acrylic polyol, polyester polyol, A polyether polyol or the like is used. Polyvalent isocyanates include 1,3- and / or 1,4-phenylene diisocyanate, 2,4- and / or 2,6-tolylene diisocyanate (TDI), diphenylmethane diisocyanate aromatic polyisocyanate, tetra Aliphatic polyisocyanates such as methylene diisocyanate and hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4′-diisocyanate (hydrogenated MDI), cyclohexylene diisocyanate, methylcyclohexylene diisocyanate (hydrogenated TDI) And alicyclic polyisocyanates.

Examples of the styrene-acrylic acid resin include copolymers of styrene 20 to 40% by weight, methyl methacrylate 5 to 15% by weight, butyl acrylate 10 to 30% by weight, and acrylic acid 10 to 20% by weight. it can. The styrene-acrylic acid resin preferably has an acid value of 100 to 240, a molecular weight of 1,600 to 2,000, and a Tg of 30 to 85 ° C.

Examples of the styrene-maleic acid resin include a styrene-maleic anhydride copolymer and an esterified resin obtained by partially esterifying a styrene-maleic anhydride copolymer to lower the acid value. The styrene-maleic acid resin preferably has an acid value of 180 to 280 and a molecular weight of 2,000 to 70,000, an acid value of 180 to 280, a Tg of 60 to 70 ° C., and a molecular weight of 2,000 to 20,000. More preferred.

Examples of the rosin-maleic acid resin include a resin obtained by adding maleic anhydride to rosin, and a resin obtained by partially esterifying this resin with a polyol. The rosin-maleic acid resin preferably has an acid value of 110 to 300, a Tg of 130 to 150 ° C., and is alcohol-soluble.

  When the antistatic layer has poor adhesion depending on the material of the transfer object, an adhesive layer may be laminated on the antistatic layer. The material of the adhesive layer has no adhesiveness at room temperature but may have adhesiveness by heating, and includes what is called an adhesive or hot melt, and is not particularly defined. For example, acrylic resin, epoxy resin, vinyl acetate resin, vinyl chloride resin, isocyanate resin, styrene-butadiene resin, vinyl chloride-vinyl acetate resin, ethylene-vinyl acetate resin, polyester resin, chlorinated rubber Resins, chlorinated polypropylene resins, polyurethane resins and the like can be mentioned. One or more selected from these materials are used.

  When the material to be transferred is an acrylic resin plate or a polycarbonate plate, excellent adhesion can be obtained particularly when a mixture of acrylic resin and vinyl chloride-vinyl acetate resin is used.

  When the adhesive layer contains an ultraviolet absorber, the light resistance can be improved with respect to the transfer target. As the ultraviolet absorber, the ultraviolet absorber is selected from commonly used salicylic acid type, benzophenone type, benzotriazole type, hindered amine type, Ni salt type, cyanoacrylate type, oxalic acid anilide type, and the like. I can do it. Specific examples include salicylic acid-based ultraviolet absorbers such as phenyl salicylate, pt-butylphenyl salicylate, p-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4 -Octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4, Benzophenone ultraviolet absorbers such as 4′-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy-4-hydroxy-5-benzoylphenyl) methane, 2- (2′-hydroxy -5'-methyl Phenyl) benzotriazole, 2- (2′-hydroxy-5′-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) -5 Chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-amylphenyl) benzotriazole, 2- (2′-hydroxy-4′-octoxyphenyl) benzotriazole, 2- [2 '-Hydroxy-3'-(3 ", 4", 5 ", 6" -tetrahydrophthalimidomethyl) -5'-methylphenyl] benzotriazole, 2,2-methyle Bis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], and methyl-3- [3- (2H-benzotriazol-2-yl) ) -5-t-butyl-4-hydroxyphenyl] propionate and polyethylene glycol, a benzotriazole ultraviolet absorber such as a reaction product, and phenyl-4-piperidinyl carbonate, bis (2,2, 6,6-tetramethyl-4-piperidinyl) sebacate, bis (N-methyl-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, chinuvin 144, tinuvin 622LD, chimasorb 944LD manufactured by Ciba Geigy Hindered amine-based UV absorbers and the like.

Among these, benzotriazole type ultraviolet absorbers and benzophenone type ultraviolet absorbers are preferably used for maintaining the transparency of the antistatic layer. The amount of the ultraviolet absorber used is preferably about 2 to 30% by weight in the total solid content of the adhesive layer. If it is less than 2% by weight, the effect of light resistance is insufficient, and if it exceeds 25% by weight, the effect is saturated and uneconomical, and the adhesive layer surface becomes sticky and blocking may occur.

As a method for forming the adhesive layer, a coating liquid obtained by diluting the above resin with water or an organic solvent is usually used as a printing method such as gravure printing, offset printing, or screen printing, or roll coating, bar coating, comma What is necessary is just to apply | coat by coating methods, such as a coat | court, a spray coat, or an extrusion coat | court, and then drying or cooling and forming. The thickness of the adhesive layer is not particularly limited, but is usually about 1 to 10 μm.

  When the transfer layer is required to have high hard coat properties, a transparent cured resin layer may be provided between the antistatic layer and the adhesive layer of the invention of claim 3.

As the transparent cured resin layer, a layer obtained by curing a resin composition that is crosslinked and cured by a chemical reaction at room temperature, heat, ionizing radiation, or the like can be applied, and an ionizing radiation curable resin is preferable. The thickness of the transparent cured resin layer is usually about 1 to 10 μm. Examples of the thermosetting resin composition include thermosetting resins such as polyurethane resins, phenol resins, urea resins, melamine resins, epoxy resins, and unsaturated polyester resins.

As an ionizing radiation curable resin composition cured by ionizing radiation, a compound having a radical polymerizable unsaturated group in a molecule such as a polyfunctional compound (meth) acrylate such as a polyhydric alcohol, an epoxy compound or the like Known compounds composed of a compound having a cationic polymerization type functional group, a monomer (monomer) of a compound such as an unsaturated polyester, or an oligomer (or prepolymer) can be applied. These monomers and oligomers (or prepolymers) may be used singly, or different monomers, different oligomers (or prepolymers), or monomers and oligomers (or May be used by mixing with (prepolymerized with ionizing radiation).

Examples of the polyurethane resin include those described in the description of the polyurethane resin of Group A.

As the monomer of (meth) acrylate, ethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) ) Acrylate and the like.

Examples of the (meth) acrylate oligomer (or prepolymer) include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, and triazine (meth) acrylate.

Examples of the epoxy compound include a bisphenol type epoxy resin and a novolac type epoxy resin. Further, these monomers and oligomers (or prepolymers) usually used are in a liquid state at room temperature (normal temperature) in an uncrosslinked state and become solid only after crosslinking. However, in the case of use in which a transfer sheet is transferred while being formed on a concavo-convex surface, it is preferable to use a form that forms a solid even in an uncrosslinked stage and becomes a solid in a crosslinked state upon irradiation with ionizing radiation.

The usage form of the ionizing radiation curable resin composition of the above form is as follows. First, the ionizing radiation curable resin composition is dissolved (or dispersed) in a solvent to form a liquid and then applied to the surface of the antistatic layer on the substrate, and then the solvent is evaporated and dried to leave it uncrosslinked. To make a non-adhesive solid to form a transparent cured resin layer in an uncrosslinked state, thereby producing a transfer sheet. In that case, if necessary, the ionizing radiation is irradiated in an appropriate amount, incompletely (partially) in a crosslinked state, within a range that does not impair molding followability to the uneven surface, or more completely dry, or The flow of the transparent cured resin layer due to heat and stress during transfer may be prevented. Next, an adhesive layer is provided on the transparent cured resin layer to produce a transfer sheet. The transfer sheet is transferred onto the article while following the uneven surface. At this time, since the transparent cured resin layer is not completely crosslinked, the thermoplastic resin is maintained and sufficiently follows the uneven surface. Thereafter, the transparent cured resin layer is crosslinked and cured by irradiating with ionizing radiation. At this time, the transparent cured resin layer exhibits sufficient scratch resistance (hard coat property).

Examples of ionizing radiation curable resin plastics that are solid even in the uncrosslinked stage include: (1) (meth) acrylate, epoxy resin, having a high molecular weight and a melting point or melting temperature of room temperature or higher (usually 80 ° C. or higher); Or oligomer (or prepolymer) such as unsaturated polyester, (2) monomer, oligomer (or prepolymer) such as liquid (meth) acrylate, epoxy resin, or unsaturated polyester in an uncrosslinked state at room temperature And a non-adhesive solid at room temperature by adding a thermoplastic resin such as an acrylic resin or a urethane resin that is solid at room temperature.

Furthermore, the various ionizing radiation curable resin compositions listed above are used by adding additives such as a reactive diluent, a photopolymerization initiator, a photosensitizer, and a filler as necessary.

Examples of the reactive diluent include monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, N-vinylpyrrolidone, and polyfunctional monomers such as tripropylene glycol diacrylate, trimethylolpropane tri ( Examples include (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, and neopentyl glycol di (meth) acrylate.

The photopolymerization initiator is required to be added when using light such as ultraviolet rays and visible rays as ionizing radiation. Examples of photopolymerization initiators include acetophenones, benzophenones, and thioxanthones in the case of compounds having radically polymerizable unsaturated groups in the molecule, and in the case of compounds having a cationically polymerizable functional group in the molecule. Includes aromatic diazonium salts, aromatic iodonium salts, metallocene compounds, and the like. Examples of the photosensitizer include n-butylamine, triethylamine, tri-n-butylphosphine, and the like.

The transparent cured resin layer may contain a filler. As the filler, inorganic fine particles, organic fine particles, and inorganic layered compounds can be applied. Examples of the inorganic fine particles include calcium carbonate, calcium silicate, clay, kaolin, talc, silica, glass, diatomaceous earth, mica powder, alumina, magnesium oxide, zinc oxide, barium sulfate, aluminum sulfate, calcium sulfate, basic magnesium carbonate, Although molybdenum disulfide can be used, silica is preferable.

As the organic fine particles, a thermoplastic resin having a glass transition temperature of 50 ° C. or higher is preferable. For example, WAX, polyethylene, fluorine resin, acrylic resin, methacrylic resin, phenol resin, urea resin, melamine resin, epoxy resin, Copolymerization of thermosetting resins such as unsaturated polyester resins, polystyrene, styrene and / or α-methylstyrene with other monomers (eg maleic anhydride, phenylmaleimide, methyl methacrylate, butadiene, acrylonitrile, etc.) Fine particles such as coalescence (for example, AS resin, ABS resin, MBS resin, heat-resistant ABS resin, etc.) can be applied.

Inorganic layered compounds include talc, montmorillonite, zirconium phosphate, teniolite, saponite, hectorite, zeolite, titanate (K ₂ Ti ₄ O ₉ ), niobate (K ₄ Nb ₆ O ₁₇ ), graphite, sulfide In addition, a product (MoS ₂ ), muscovite, soda mica, phosphomica, synthetic smectite, fluorine-based, silicon-based, and other expansive and non-expandable synthetic mica can be used. If the particle size of the inorganic layered compound in the transparent curable resin layer is too small, the hard coat function tends to decrease and the scratch resistance tends to decrease, while if too large, the surface smoothness of the transparent curable resin layer decreases. However, there is a tendency that glossiness is lost. From this point, the inorganic layered compound in the transparent cured resin layer preferably has an average particle size in the range of 0.5 to 25 μm. Here, the average particle diameter of the inorganic layered compound refers to a value measured by a light scattering method using a laser.

As content of a filler, it is about 1-100 weight part with respect to 100 weight part of transparent cured resin parts, Preferably it is 2-20 weight part range. If it is less than this range, the improvement in hard coat properties is small, and if it exceeds this, haze increases, which hinders the optical member. The shape of the fine particles is not particularly limited, and may be spherical, rectangular, plate-like, flake-like, needle-like, or hollow. Thus, when a transparent hardening resin layer is made to contain a filler, since a filler functions as an abrasion-resistant material, hard coat property can be improved remarkably.

Since the transparent cured resin layer may lack adhesion with the adhesive layer, a primer layer may be provided as necessary. By the primer layer, the adhesion with the adhesive layer is improved, and the transparent cross-linked cured resin layer and the adhesive layer are sufficiently adhered to each other, so that the transfer layer is less likely to drop off from the transferred body after transfer.

Examples of the primer layer include urethane resin, polyester resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, polyvinyl alcohol resin, polyvinyl acetal resin, ethylene and vinyl acetate. Alternatively, a copolymer with acrylic acid or the like, an epoxy resin, or the like can be applied. Preferably, it is urethane resin which consists of isocyanate or isocyanate and a polyhydric alcohol.

These resins are appropriately dissolved or dispersed in a solvent to form a coating solution, which is applied to the transparent cured resin layer by a known coating method and dried to form a primer layer. In addition, when a resin, a monomer, an oligomer, a prepolymer, and the like are combined with a reaction initiator, a curing agent, a crosslinking agent, or the like as appropriate, or when a main agent and a curing agent are combined, they are applied, dried, and reacted. Alternatively, it may be formed by reacting with an aging treatment after drying. The primer layer has a thickness of about 0.05 to 10 μm, preferably 0.1 to 5 μm.

If necessary, a second antistatic layer is provided on the opposite side of the substrate where the antistatic layer is provided. The second antistatic layer is for preventing dust from adhering due to the generation of static electricity during the manufacture, storage and transfer of the antistatic layer transfer sheet, and the material of the second antistatic layer is particularly limited. However, various antistatic agents can be applied.

Examples of the antistatic agent used in the second antistatic agent include higher alcohol ethylene oxide (EO) adducts, fatty acid ethylene oxide adducts, higher alkylamine ethylene oxide adducts, polyethylene glycols such as polypropylene glycol ethylene oxide adducts, and alkylphenols. EO adducts, alkylene oxides such as polyethylene oxide, fatty acid esters of glycerin, fatty acid esters of pentaerythritol, fatty acid esters of sorbit and sorbitan, alkyl ethers of polyhydric alcohols, aliphatic amides of alkanolamines, etc. Nonionic surfactants such as alcohols and polyhydric alcohol esters, carboxylates such as alkali metal salts of higher fatty acids, higher alcohol sulfates, higher alkyl esters Sulfate esters such as tersulfate salts, sulfonates such as alkylbenzene sulfonates and paraffin sulfonates, phosphate esters such as higher alcohol phosphates, phosphates, phosphonates, phosphonates, etc. Anionic surfactants, higher alkyl amines, cyclic amines, hydantoin derivatives, amide amines, ester amides, quaternary ammonium salts such as alkyltrimethylammonium salts, pyridine and other heterocyclic rings, cation surface activity such as phosphonium or sulfoniums Agents, amino acids such as higher alkylaminopropionates, aminosulfonic acids, sulfuric or phosphate esters of amino alcohols, higher alkyl dimethyl betaines, higher alkyl dihydroxyethyl betaines, Surfactants such as amphoteric surfactants such as ins, natural surfactants such as saponins, carbon black, graphite, modified graphite, carbon black graft polymer, tin oxide-indium oxide, tin oxide-antimony oxide, oxidation Conductive powders such as tin and titanium oxide-tin oxide-antimony oxide can also be applied.

In addition, a high molecular weight antistatic agent in which a conductivity-providing functional group of a low molecular weight antistatic agent such as a surfactant is bonded to a polymer can also be applied. Polymer type antistatic agents are also classified into nonionic, anionic, cationic and amphoteric types, and polyether type (polyethylene oxide, polyethylene oxide cross-linked product, copolymer of polyethylene oxide and other resin, polyethylene glycol, Nonionic, quaternary ammonium salt (copolymer containing quaternary ammonium base, quaternary ammonium base-containing (meth) acrylate copolymer, quaternary) such as polyethylene glycol and other resin copolymer) Cationic systems such as ammonium base-containing maleimide copolymers and quaternary ammonium base-containing methacrylimide copolymers), sulfonic acid systems (polystyrene sulfonate soda), amphoteric betaines (carbobetaine graft copolymers), etc. There is an anionic system.

Furthermore, polyacetylene, polyaniline, polythiophene, polypyrrole, polyphenylene sulfide, poly (1,6-heptadiyne), polybiphenylene (polyparaphenylene), polyparafinylene sulfide, polyphenylacetylene, polo (2,5-thienylene), or Conductive polymers such as these derivatives can be used.

These antistatic agents may be used alone or in combination, and may be applied alone or mixed with other binders. The content of these surfactants is about 0.01 to 10% by weight. Moreover, you may add additives, such as a plasticizer, a stabilizer, a hardening | curing agent, a dispersing agent chelating agent, a pH adjuster, antiseptic | preservative, and an antifoamer, as needed.

As described above, since the antistatic layer of the present invention has good releasability, it is not necessary to provide a release layer. However, depending on the binder used in combination with the cationic acrylic resin, the releasability may be deteriorated. In such a case, a release layer may be provided. Basically, the release layer is a layer remaining on the substrate side after the antistatic layer is transferred. Although a part of the release layer may move to the transferred body together with the antistatic layer, it does not substantially affect the function, and this is also within the scope of the present invention. As a material for the release layer, the following release resin having release properties with respect to the transfer layer (the antistatic layer on the outermost surface thereof) and a resin containing a release agent are appropriately selected and used. Depending on the selected antistatic layer, the release resin is usually melamine resin, fluorine resin, silicone resin, epoxy resin, cellulose resin, ketone resin, petroleum resin, ionizing radiation that crosslinks with ionizing radiation. For example, a curable resin. The resin containing the release agent is an acrylic resin, a vinyl resin, a polyester resin, a cellulose resin, or the like obtained by adding or copolymerizing a release agent such as fluorine resin, silicone resin, or various waxes. . Examples of the ionizing radiation curable resin include (meth) acrylate-based and epoxy-based monomers / oligomers having a functional group that is polymerized (cured) by ionizing radiation such as ultraviolet (UV) and electron beam (EB). It is a resin containing.

The release layer is formed by dispersing or dissolving the resin in a solvent (solvent), and then rolling, reverse roll coating, gravure coating, reverse gravure coating, bar coating, rod coating, kiss coating, knife coating, die coating, comma coating, It is formed by applying and drying by a known coating method such as flow coating or spray coating to remove the solvent. In the case of heat drying at a temperature of 30 ° C. to 200 ° C., aging, or ionizing radiation curable resin, it is crosslinked by irradiating with ionizing radiation.

The thickness of the release layer is usually about 0.01 μm to 5.0 μm, preferably about 0.1 μm to 3.0 μm. The thinner the thickness is, the better. However, when the thickness is 0.1 μm or more, better film formation is obtained and the peeling force is stabilized.
Articles to which the transfer layer including the antistatic layer is transferred using the transfer sheet of the present invention, that is, the transfer target include packaging containers for food, household appliances, daily necessities, TVs, personal computers, mobile phones, etc. There may be various things such as a casing, window material, instrument panel, etc. of the electronic and electrical products, and it is not particularly limited.

Preferably, it is difficult to directly form an antistatic layer, and high transparency and low haze are required, and the antistatic property is required to have little change with time and humidity dependency. It is suitable as a body. For example, molded products such as display windows of edge light type surface light sources used in liquid crystal display devices such as personal computers, word processors, and liquid crystal TVs, or reflectors, lens films, viewing angle adjusting films, antireflection films, antiglare films used in these. Film, touch panel, etc.

There are various surface materials to be transferred by the transfer target, but this can be dealt with by appropriately selecting the material of the adhesive layer. For example, acrylic resins, polycarbonate resins, resins such as polystyrene, ceramics such as glass, and the like can be given.

As a transfer method, a method of transferring by heating and pressurizing a heating roller, a hot stamp method, a method of inserting a transfer sheet into an injection mold and transferring using the heat and pressure of the injection resin, so-called injection molding simultaneous transfer It may be a known method such as a method called a method, and is not particularly limited.

Example 1
Cationic acrylic resin, 10 parts (Elecond PQ-50B, solid content 50%, manufactured by Soken Chemical), Acrylic polyol resin, 10 parts (Acrydic A-814, solid content 50%, manufactured by Dainippon Ink and Chemicals), methyl ethyl ketone, 80 parts were put into a paint shaker and stirred for 60 minutes to obtain a coating solution 1. The obtained coating solution 1 is applied to a substrate (trade name: Lumirror S10, manufactured by Toray) made of polyethylene terephthalate having a thickness of 38 μm by a Mayer bar coater, dried to a thickness of 0.2 μm, and charged by drying. A prevention layer transfer sheet was obtained. Next, the surface of the antistatic layer of the obtained antistatic layer transfer sheet is opposed to a transfer object on a flat plate made of acrylic resin and polycarbonate having a thickness of 4 mm, and heated using two rubber rolls heated to 150 ° C. Then, the antistatic layer was thermally transferred onto the transfer medium by pressurization to obtain a transfer material on which the antistatic layer was transferred. The evaluation described below was then performed.

Examples 2-10
A coating solution having the composition shown in Table 1 was prepared, and an antistatic layer transfer sheet was prepared and evaluated in the same manner as in Example 1.

Table 1 Antistatic layer coating solution (parts by weight)

* 1 Cationic acrylic resin, Soken Chemical Co., Ltd., Elecondo PQ-50B
* 2 Acrylic polyol resin, Dainippon Ink & Chemicals, Inc., Acrydic A814
* 3 Nitrated cotton: Asahi Kasei Co., Ltd., 1/8 sec. Nitrated cotton, 30% by weight ethyl acetate / isopropyl alcohol solution (solvent ratio of 1: 1 or less is the same).
* 4 Cellulose acetate butyrate: Eastman Kodak Company, CAB381-0.5, 15 wt% ethyl acetate / isopropyl alcohol solution.
* 5 Acrylic resin: Mitsubishi Rayon Co., Ltd., Dianal BR-107, 45 wt% ethyl acetate / isopropyl alcohol solution.
* 6 Urethane resin: Sanyo Chemical Industries, Samprene IB104, 30 wt% ethyl acetate / isopropyl alcohol solution.
* 7 Styrene-acrylic acid resin: Johnson Polymer, Jonkrill 682, acid value 235, molecular weight 1,600, Tg 57 ° C., 50 wt% ethyl acetate / isopropyl alcohol solution.
* 8 Styrene-maleic resin: Modern Chemical Co., CA-6623, 40 wt% ethyl acetate / isopropyl alcohol solution.
* 9 Rosin-maleic acid resin: Rika Hercules Co., Ltd., 40% by weight ethyl acetate / isopropyl alcohol solution of pentalin 269.

Examples 11-20
The following adhesive layer coating solution was applied to the antistatic layer surface side of each of the antistatic layer transfer sheets of Examples 1 to 10 with a Meyer bar so as to be 2 μm at the time of drying, and the adhesive layer was laminated. An antistatic layer transfer sheet was prepared and evaluated in the same manner as in Example 1.

Adhesive layer coating liquid acrylic resin, 4 parts (Dianar BR-88, solid content 100%, manufactured by Mitsubishi Rayon), vinyl chloride-vinyl acetate resin, 4 parts (Solvine CN, solid content 100%, manufactured by Nisshin Chemical) 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2 parts, toluene, 50 parts, methyl ethyl ketone, 40 parts

Examples 21-30
The following transparent cured resin layer coating solution was applied to each antistatic layer transfer sheet of Examples 1 to 10 with a Mayer bar so that the thickness would be 4 μm when dried, and 200 mj / cm ² with a UV irradiation device. The transparent cured resin layer was cured by irradiating the UV light with the integrated light quantity. Next, the above adhesive layer coating solution was applied to the surface of the transparent cured resin layer with a Meyer bar so that the thickness would be 2 μm when dried, and the antistatic layer transfer sheet was prepared by laminating the adhesive layer. Evaluation was performed in the same manner as in Example 1.

Transparent cured resin layer coating solution Mixed solution of epoxy acrylate and urethane acrylate, 40 parts (beam set 374, solid content 65%, manufactured by Arakawa Chemical), acetophenone photopolymerization initiator, 2 (Irgacure 184, manufactured by Ciba Specialty Chemicals) ), Ethyl acetate, 58 parts

Comparative Example 1
Stearyl diethanolamine monostearate (cationic surfactant), 1 part, acrylic polyol resin, 10 parts (Acrydic A-814, solid content 50%, manufactured by Dainippon Ink & Chemicals), methyl ethyl ketone, 89 parts are put in a paint shaker The mixture was stirred for 60 minutes to obtain a coating solution. The obtained coating liquid was applied to the same base material as in the example with a Mayer bar coater so as to have a dry thickness of 0.2 μm, and dried to obtain an antistatic layer transfer sheet. Next, the surface of the antistatic layer of the obtained antistatic layer transfer sheet is opposed to the surface of a transfer material made of acrylic resin and polycarbonate having a thickness of 4 mm, and heated using two rubber rolls heated to 150 ° C., The antistatic layer was thermally transferred onto the transfer medium by pressurization to obtain a transfer material onto which the antistatic layer was transferred, and the same evaluation as in the examples was performed.

Comparative Example 2
Lithium trifluoromethanesulfonate (lithium surfactant), 2 parts (Sanconol PEO-20R, solid content 100%, manufactured by Sanko Chemical Co., Ltd.), acrylic polyol resin, 10 parts (Acridic A-814, solid content 50%, large Nippon Ink Chemical Co., Ltd.), 80 parts of methyl ethyl ketone, were placed in a paint shaker and stirred for 60 minutes to obtain a coating solution. The obtained coating liquid was applied to the same base material as in the example with a Mayer bar coater so as to have a dry thickness of 0.2 μm, and dried to obtain an antistatic layer transfer sheet. Next, the surface of the antistatic layer of the obtained antistatic layer transfer sheet was opposed to the surface of a transfer material on a flat plate made of acrylic resin and polycarbonate having a thickness of 4 mm, and two rubber rolls heated to 150 ° C. were used. The transfer material with the antistatic layer transferred was obtained by thermally transferring the antistatic layer onto the molding plate by heating and pressing, and the same evaluation as in the examples was performed.

(Evaluation methods)
Surface resistance value
In accordance with JIS K-6911, the surface resistance value of the material to be transferred was measured.
○: Surface resistance value is less than 1 × 10 ¹⁰ Ω / □ Δ: Surface resistance value is 1 × 10 ¹⁰ Ω / □ to 1 × 10 ¹⁴ Ω / □
×: Surface resistance value is higher than 1 × 10 ¹⁴ Ω / □

transparency
In accordance with JIS R-3106, the visible light transmittance of the transfer material was measured.
○: Visible light transmittance is higher than 85% Δ: Visible light transmittance is 80% to 85%
X: Visible light transmittance is less than 80%

After the water-resistant transfer material was treated in a 65 ° C. × 95% humidity environment for 24 hours, the surface resistance value of the transfer material was measured.
○: Surface resistance value is less than 1 × 10 ¹⁰ Ω / □ Δ: Surface resistance value is 1 × 10 ¹⁰ Ω / □ to 1 × 10 ¹⁴ Ω / □
×: Surface resistance value is higher than 1 × 10 ¹⁴ Ω / □

Adhesion
In accordance with the JIS K-5600 cross-cut method, the adhesion of the antistatic layer to the transferred material was measured.
○: Antistatic layer is not peeled off and adhesion is good. Δ: The antistatic layer is removed only at the cut part, but the adhesiveness is good in other cases. ×: The part where the antistatic layer is peeled off is many and the adhesiveness is good. Bad

Pencil hardness
In accordance with JIS K-5600, the pencil hardness of the material to which the antistatic layer was transferred was measured.

The above evaluation results are summarized in Tables 2 to 5. In Tables 2 to 5, A indicates that an acrylic resin transfer object is used, and P indicates that a polycarbonate resin transfer object is used.

Table 2

Table 3

Table 4

Table 5

The materials to be transferred of Examples 1 to 30 all showed good results in the evaluation of surface resistance, transparency, water resistance, and adhesion. The pencil hardness of Examples 21 to 30 provided with a transparent cured resin layer was H or 2H, indicating a high hard coat property. The reason why the pencil hardness differs depending on the transfer target is that the acrylic resin plate has a higher pencil hardness than the polycarbonate plate.

It is a schematic cross section of three examples of the antistatic layer transfer sheet of this invention.

Explanation of symbols

1 base material 2 antistatic layer 3 adhesive layer 4 transparent cured resin layer 5 antistatic layer transfer sheet

Claims (4)

An antistatic layer transfer sheet comprising at least an antistatic layer on a substrate, wherein the antistatic layer is made of a cationic acrylic resin. 2. The antistatic layer transfer sheet according to claim 1, wherein the antistatic layer further contains at least one group A resin.
Group A resin Acrylic polyol resin, cellulose resin, mixture of acrylic polyol resin and cellulose resin, mixture of cellulose resin and acrylic resin, mixture of cellulose resin and polyurethane resin, styrene-acrylic acid resin, Styrene-maleic acid resin, rosin-maleic acid resin.
3. The antistatic layer transfer sheet according to claim 1, wherein at least an antistatic layer and an adhesive layer are sequentially laminated on the substrate. The antistatic layer transfer sheet according to claim 1, wherein at least an antistatic layer, a transparent cured resin layer, and an adhesive layer are sequentially laminated on the substrate.

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