JP2003011281A - Surface protective sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a surface protective sheet, which is excellent in ultraviolet absorbency as it is, adhesion between a transparent polymer film and a surface protective layer and its hard coating properties. SOLUTION: In this surface protective sheet, a transparent surface protective layer is provided on the surface of the transparent polymer film. As the surface protective layer, one layer including an ultraviolet absorbing resin and an ultraviolet curing resin is employed and especially the layer is formed by curing the ultraviolet curing resin with an ultraviolet curing paint in conjunction with a photopolymerization initiator. The photopolymerization initiator is one having a peak in an absorption wavelength range at a position different by at least 20 nm or more from the peak in the absorption wavelength range of the ultraviolet absorbing resin.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface protection sheet suitable for protecting the surface of display boards such as guide boards, advertisements, signboards, signs, posters, nameplates, nameplates, etc., and is particularly displayed. The present invention relates to a surface protection sheet that improves the light resistance of images such as characters.

[0001]

2. Description of the Related Art Conventionally, surface protection sheets have been used to protect the surface of display boards such as guide boards, advertisements, signboards and signs.

Such a surface protective sheet has a property that the surface thereof is not easily scratched, and an image which is a display content of a display plate is not discolored or discolored due to the influence of ultraviolet rays or the like. The property to do is required.

Here, as a means for providing a surface protective layer on the surface of the polymer film, which exhibits scratch resistance, a UV-curable type is generally used because of the problem of low heat resistance of the polymer film when the surface protective layer is formed. Resins have been used.

On the other hand, in order to give the surface protection sheet a property of preventing the image or the like, which is the display content of the display plate, from being discolored or faded due to the influence of ultraviolet rays or the like,
It is common to use an ultraviolet absorber, and as a method of using it, a surface protective layer having a hard coat property may be provided on the surface of a polymer film in which an ultraviolet absorber is kneaded,
It has been practiced to provide an undercoat layer containing an ultraviolet absorber between a surface protective layer having a hard coat property and a polymer film.

However, the polymer film in which the ultraviolet absorber is kneaded becomes expensive in cost, or the interface with the surface protective layer is caused by the bleeding of the ultraviolet absorber (a phenomenon in which the inside is transferred to the interface). There are problems such as adversely affecting adhesion. Further, in the undercoating layer containing the ultraviolet absorbent, the thickness must be thinned in order not to deteriorate the hard coat property of the surface protective layer in the first place. There is a problem in that it is extremely difficult to obtain sufficient adhesiveness and UV absorption. Neither method can improve the deterioration of durability of the surface protective layer itself due to the deterioration of ultraviolet rays.

[0006]

Therefore, the object of the present invention is to provide excellent ultraviolet absorption as a surface protective sheet and excellent adhesiveness between the polymer film and the surface protective layer as described above. In addition, it is an object to obtain a surface protective sheet having excellent hard coat properties of the surface protective layer and its durability.

[0007]

Therefore, the present inventors have
The present invention has been completed as a result of earnest research as to whether or not it is possible to impart excellent adhesiveness to a polymer film while imparting the above-mentioned ultraviolet absorption and hard coat properties to a single layer as a surface protective layer. Came to.

That is, the surface protective sheet of the present invention is a surface protective sheet having a transparent surface protective layer on the surface of a transparent polymer film, wherein the surface protective layer comprises an ultraviolet absorbing resin and an ultraviolet curable resin. It is characterized by being contained.

Further, in the surface protection sheet of the present invention, the ultraviolet absorbing resin contains 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole as a monomer component having an ultraviolet absorbing group. It is characterized in that it is an ultraviolet absorbing acrylic resin containing.

In the surface protective sheet of the present invention, the UV curable resin is used in combination with a UV curable coating composition in which one or more photopolymerizable prepolymers or photopolymerizable monomers are mixed with a photopolymerization initiator. Then, it is formed by being cured by irradiation with ultraviolet rays.

Further, in the surface protective sheet of the present invention, the photopolymerization initiator has an absorption wavelength range peak at a position different from the absorption wavelength range peak of the ultraviolet absorbing resin by at least 20 nm or more. It is a feature.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The surface protective sheet of the present invention will be described in detail below.

The surface protective sheet of the present invention has a transparent surface protective layer on the surface of a transparent polymer film, and contains an ultraviolet absorbing resin and an ultraviolet curable resin as the surface protective layer. Adopt one. By having a transparent surface protective layer containing the ultraviolet absorbing resin and the ultraviolet curable resin on the surface of the transparent polymer film as described above, it is excellent even for a polymer film having low heat resistance. It is possible to form a surface protective layer having excellent adhesiveness and hard coat properties and durability, and to impart an excellent ultraviolet absorbing function as a surface protective sheet.

The transparent polymer film is not particularly limited as long as it has transparency to such an extent that an image on a display panel protected through the polymer film can be visually recognized. Resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin,
One or two kinds of acetal resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin, fluorine resin, etc. A transparent polymer film obtained by mixing the above can be used.

The thickness of the transparent polymer film is not particularly limited as long as it has a thickness that does not hinder handling, but from the viewpoint of processability, polyethylene having a thickness of about 100 to 500 μm is used. A polyester film such as terephthalate or polycarbonate can be preferably used.

Next, the surface protective layer is transparent to the extent that the image on the display plate protected by the surface protective sheet is visible, and contains an ultraviolet absorbing resin and an ultraviolet curable resin. It will be.

Specific examples of the ultraviolet absorbing resin include an ultraviolet absorbing acrylic resin, and 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H- represented by the following formula. A copolymer containing benzotriazole and a monomer having an ethylenically unsaturated double bond capable of radical polymerization is preferable. This allows
The UV absorbing acrylic resin used in the present invention is 290 to 290.
It has absorption characteristics for light of 400 nm.

[0018]

[Chemical 1]

The above-mentioned benzotriazole is a compound that imparts ultraviolet absorption to the resin, and the upper limit of the ultraviolet absorption resin is 80% by weight or less, preferably 60% by weight or less, more preferably 55% by weight or less, The lower limit is 5% by weight or more.

The monomer having a radical-polymerizable ethylenically unsaturated double bond contains at least one kind of (meth) acrylic acid ester, especially (meth) acrylic acid ester having an alkyl group having 1 to 12 carbon atoms. Is preferred. By incorporating a (meth) acrylic acid ester having an alkyl group having 1 to 12 carbon atoms, the physical properties of the coating film can be adjusted. Specifically, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate,
One or more of hexyl (meth) acrylate and 2-ethylhexyl (meth) acrylate can be used, and butyl acrylate, butyl methacrylate and 2-ethylhexyl acrylate are particularly preferably used.

Further, in order to improve the cohesive force of the coating film and to impart cross-linking points, the (meth) acrylic acid ester is partially composed of a functional group such as a carboxyl group, a hydroxyl group, an amino group, an acetoacetoxyethyl group, an epoxy group or the like. May be included. Examples of the monomer having such a functional group include (meth) acrylic acid, β-carboxyethyl acrylate, 2-hydroxyethyl (meth) acrylate, and 2
-Hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, aminomethyl (meth) acrylate, dimethylaminomethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, acetoacetoxyethyl (meth) acrylate, glycidyl ( Examples thereof include (meth) acrylate.

Further, in order to improve the adhesiveness with a polymer film, the physical properties of the coating film, etc., vinyl acetate, vinyl propionate, vinyl ether, styrene, as a monomer component having a radically polymerizable ethylenically unsaturated double bond,
A monomer such as (meth) acrylonitrile may be added. In addition, as a monomer that can be added to impart a cross-linking point, etc., itaconic acid, crotonic acid, maleic acid, a monomer containing a carboxyl group such as maleic anhydride, a monomer containing a hydroxyl group such as allyl alcohol, an amino such as vinylpyridine, etc. Examples thereof include a monomer having a group.

Since the above-mentioned ultraviolet absorbing acrylic resin used in the present invention is a polymer resin in which an ultraviolet absorbing group is introduced into the acrylic resin, the interfacial adhesion caused by the bleeding which occurs in a low molecular weight ultraviolet absorbing agent. It will be possible to avoid problems such as lowering. Therefore, by mixing this UV-absorbing acrylic resin with a UV-curable resin to form a surface-protecting layer, the UV-absorbing property as a surface-protecting layer that does not impair the adhesion to the transparent polymer film and the hard coat property is obtained. Can also be imparted, and it becomes possible to exert an excellent ultraviolet absorbing function as a surface protective sheet.

Next, as the ultraviolet curable resin, a photopolymerization initiator is used in combination with an ultraviolet curable coating material in which one kind or two or more kinds of a photopolymerizable prepolymer or a photopolymerizable monomer is mixed and cured by irradiation of ultraviolet rays. What is formed by doing is used. This makes it possible to form a surface protective layer having excellent hard coat properties even on a polymer film having low heat resistance.

As such a photopolymerizable prepolymer, an acrylic prepolymer having two or more acryloyl groups in one molecule and having a three-dimensional network structure by being crosslinked and cured is particularly preferably used. As the acrylic prepolymer, urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate and the like can be used.

As the photopolymerizable monomer, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, dipentaerythritol monohydroxypentaacrylate, neopentyl glycol diacrylate, tripropylene glycol triacrylate, diethylene glycol diacrylate. And polyfunctional monomers such as 1,6-hexanediol diacrylate.

As the photopolymerization initiator, acetophenone,
Benzophenone, Michler's ketone, benzoin, benzyl methyl ketal, benzoin benzoate, hydroxycyclohexyl phenyl ketone, 2-methyl-1-
(4- (methylthio) phenyl) -2- (4-morpholinyl) -1-propane, α-acyloxime ester,
Examples thereof include thioxanthones. In addition to this, it is also preferable to use an ultraviolet sensitizer such as n-butylamine, triethylamine, and tri-n-butylphosphine together when curing by irradiation with ultraviolet rays.

Here, in order to sufficiently cure the ultraviolet curable coating material containing the ultraviolet absorbing resin, a photopolymerization initiator is used at a position different from the peak of the absorption wavelength range of the ultraviolet absorbing resin by at least 20 nm or more. A photopolymerization initiator having a peak in the absorption wavelength region is preferably used. By using a photopolymerization initiator having a peak in such an absorption wavelength range, even if the amount of the photopolymerization initiator added to the ultraviolet curable coating is reduced, it is possible to sufficiently cure the ultraviolet curable coating. Therefore, it becomes possible to economically exhibit extremely excellent hard coat properties in the surface protective layer. Specifically, in the combination with the ultraviolet absorbing acrylic resin containing the above-mentioned benzotriazole as a monomer component used in the present invention, the peak (3
It is preferable to use benzoin, hydroxycyclohexyl phenyl ketone, α-acyloxime ester, thioxanthones and the like having a peak in the absorption wavelength range (particularly, a peak in the absorption wavelength range of 285 nm or less) at a position different by at least 20 nm or more from (05 nm, 345 nm). .

The mixing ratio of the ultraviolet absorbing resin and the ultraviolet curable resin is 100 parts by weight of the ultraviolet curable resin.
The UV absorbing resin is 5 to 60 parts by weight, preferably 10 to
40 parts by weight. When the amount is 5 parts by weight or more, the surface protection layer can have sufficient ultraviolet absorption, and when the amount is 60 parts by weight or less, the surface protection layer can have sufficient hard coat properties.

Further, in the surface protective layer as described above, other resins, matting agents, and
Various additives such as a plasticizer, an antioxidant, a coloring agent, a lubricant, an antistatic agent, a flame retardant, an antibacterial agent, and an antifungal agent can be contained.

The surface protective sheet as described above is
A mixture of the above-mentioned UV absorbing resin, UV curable coating material and photopolymerization initiator is added as necessary to prepare a coating solution by adding additives or diluting solvent, and a transparent polymer film is formed by a conventionally known coating method. It can be formed by coating, drying and curing on the surface of. still,
When the ultraviolet curable paint is cured, it is performed by irradiating ultraviolet rays in the wavelength region of 100 to 400 nm, preferably 200 to 400 nm emitted from an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a metal halide lamp or the like. .

The thickness of the surface protective layer as described above is as follows:
There is no particular limitation as long as it can exhibit sufficient ultraviolet absorption and hard coat properties. For example, as the thickness of the surface protective layer when provided by the above coating method,
The thickness is 2 to 20 μm, preferably 3 to 15 μm, and more preferably 5 to 10 μm.

Further, the surface protective sheet as described above has another layer such as an easy-adhesion layer or an undercoat layer between the transparent polymer film and the surface protective layer for further improving the adhesiveness thereof. Alternatively, it may be one in which an adhesive layer or a printed image capable of being attached to the display plate is provided on the surface opposite to the surface protective layer.

[0034]

EXAMPLES Examples of the present invention will be described below.
In addition, "part" and "%" are based on weight unless otherwise specified.

1. 90 parts of propylene glycol monomethyl ether, 60 parts of methyl methacrylate monomer, 20 parts of butyl acrylate monomer, 2- (2'-hydroxy-) in a reaction vessel equipped with a synthetic stirrer of ultraviolet absorbing acrylic resin, a condenser, a thermometer and a nitrogen introducing tube. 20 parts of 5′-methacryloxyethylphenyl) -2H-benzotriazole monomer and 0.2 parts of α, α′-azobis (isobutyronitrile) were added, and the mixture was heated to 80 ° C. with stirring through nitrogen, and this reaction solution was added. 6 hours 3
The reaction was completed by continuing stirring for 0 minutes while maintaining the temperature at 80 ° C. to synthesize an ultraviolet absorbing acrylic resin. Propylene glycol monomethyl ether was added to this to obtain a solid content of 2
It was adjusted to 5% to obtain an ultraviolet absorbing acrylic resin solution A.

2. Preparation of Surface Protective Sheet [Example 1] On one surface of a polyethylene terephthalate film (Cosmo Shine A4300: Toyobo Co., Ltd.) having a thickness of 188 μm, a coating solution B for a surface protective layer having the following composition was applied, dried, and pressurized. The surface protection layer of the present invention was produced by forming a surface protection layer having a film thickness of about 5 μm by irradiating ultraviolet rays with a mercury lamp to cure the surface protection layer.

<Coating Liquid B for Surface Protective Layer> ・ Ultraviolet absorbing acrylic resin solution A 20 parts ・ UV curable paint (Unidick 17-806 <80 solids %>: Dainippon Ink and Chemicals, Inc.) 25 parts -2-methyl-1- (4- (methylthio) phenyl)- 2- (4-morpholinyl) -1-propane (irga Cure 907 <Peak in absorption wavelength range λ = 305 nm>: Ciba ・ Specialty Chemicals Co., Ltd.) 1.2 copies ・ Propylene glycol monomethyl ether 80 parts

[Example 2] A coating film C for the surface protective layer having the following composition was applied to one surface of a polycarbonate film (Panlite: Teijin Kasei) having a thickness of 300 µm, dried, and irradiated with ultraviolet rays from a high pressure mercury lamp. Then, the surface protective layer having a film thickness of about 5 μm was formed by carrying out the above procedure to cure the surface protective sheet of the present invention.

<Coating liquid C for surface protection layer> ・ Ultraviolet absorbing acrylic resin solution A 20 parts ・ UV curable paint (Unidick 17-806 <80 solids %>: Dainippon Ink and Chemicals, Inc.) 25 parts ・ Hydroxycyclohexyl phenyl ketone (IRGAKI 184 <Peak in absorption wavelength range λ = 240 nm>: Ciba Specialty Chemicals Co.) 0.6 ・ Propylene glycol monomethyl ether 80 parts

[Comparative Example 1] A coating liquid D for a surface protective layer having the following composition was applied to one surface of the polyethylene terephthalate film used in Example 1, dried, and irradiated with ultraviolet rays by a high pressure mercury lamp to cure. By doing so, a surface protective layer having a film thickness of about 5 μm was formed to prepare a surface protective sheet.

<Coating liquid D for surface protective layer> ・ UV curable paint (Unidick 17-806 <80 solids %>: Dainippon Ink and Chemicals, Inc.) 25 parts -2-methyl-1- (4- (methylthio) phenyl)- 2- (4-morpholinyl) -1-propane (irga Cure 907 <Peak in absorption wavelength range λ = 305 nm>: Ciba ・ Specialty Chemicals Co., Ltd.) 1.2 copies ・ Propylene glycol monomethyl ether 75 parts

[Comparative Example 2] A coating solution E for the surface protective layer having the following composition was applied to one surface of the polyethylene terephthalate film used in Example 1, dried, and irradiated with ultraviolet rays by a high pressure mercury lamp to cure. By doing so, a surface protective layer having a film thickness of about 5 μm was formed to prepare a surface protective sheet.

<Coating Liquid E for Surface Protective Layer> ・ 1 part of UV absorber (Chemisorb 79: Chemipro Kasei) ・ UV curable paint (Unidick 17-806 <80 solids %>: Dainippon Ink and Chemicals, Inc.) 25 parts -2-methyl-1- (4- (methylthio) phenyl)- 2- (4-morpholinyl) -1-propane (irga Cure 907 <Peak in absorption wavelength range λ = 305 nm>: Ciba ・ Specialty Chemicals Co., Ltd.) 1.2 copies ・ Propylene glycol monomethyl ether 75 parts

[Comparative Example 3] In Comparative Example 1, before forming the surface protective layer, the coating liquid F for the undercoat layer having the following composition was applied to the surface of the film and dried to obtain a film thickness. After forming an undercoat layer of about 1 μm, Comparative Example 1 was formed on the undercoat layer.
A surface protective sheet was prepared in the same manner as in Comparative Example 1 except that the surface protective layer was formed.

<Coating liquid F for undercoat layer> ・ 5 parts of UV absorber (Chemisorb 79: Chempro Kasei) ・ Thermoplastic acrylic resin (Acridic A-195 <solid 40%>: Dainippon Ink and Chemicals, Inc.) 32 copies ・ Propylene glycol monomethyl ether 48 parts

3. Adhesion of surface protection sheet to display board A display board is prepared by printing an image on one surface of a plastic sheet with an ultraviolet curable ink (FDOR: Seito Ink Co., Ltd.), and the surface protection sheet of Examples and Comparative Examples is prepared. The surface opposite to the surface having the surface protective layer and the printed surface of the display plate were bonded together with an adhesive.

4. Evaluation of surface protection sheet attached to display board For surface protection sheet attached to display board as described above, evaluation of light resistance of the display board and evaluation of hard coat property of surface protection layer are performed as follows. The adhesiveness between the surface protective layer and the transparent polymer film was evaluated.

[Evaluation of Light Resistance of Display Board] An accelerated tester (ultraviolet fade meter FAL-5: 200 hours of irradiation has an acceleration ability equivalent to one year of outdoor UV irradiation.
Suga Test Instruments Co., Ltd.), after irradiating ultraviolet rays for 600 hours from the surface protective layer side, discoloration of the printed image on the display board
The discoloration was visually evaluated, and those with almost no discoloration / discoloration were evaluated as “◯”, and those with severe discoloration / discoloration were evaluated as “x”. The evaluation results are shown in Table 1.

[Evaluation of Hard Coatability of Surface Protective Layer] After rubbing the surface of the surface protective layer with steel wool # 0000 for 10 reciprocations under a load of 150 g, the surface was visually evaluated for scratches. Those that were not evaluated were evaluated as “⊚”, those that were scarcely scratched were evaluated as “◯”, those that were markedly visually observable were evaluated as “Δ”, and those that were full of scratches were evaluated as “x”. The evaluation was carried out both before and after the light resistance acceleration test. The evaluation results are shown in Table 1.

[Evaluation of Adhesiveness between Surface Protective Layer and Transparent Polymer Film] Adhesiveness between the surface protective layer and transparent polymer film was evaluated by a cross-cut tape method (JIS-K5400).
"X" indicates that the area of the cross section has peeled by 30% or more, and a part of the cross section has peeled, but the peeled area is 30
% Was less than "%", and those in which the cross-cut portion did not peel at all were "O". The evaluation was carried out both before and after the light resistance acceleration test. The evaluation results are shown in Table 1.

[0051]

[Table 1]

As is clear from the results shown in Table 1, the surface protective sheets of the examples are all excellent in light resistance, hard coat property, and adhesiveness, particularly in the evaluation after the light resistance acceleration test, and are markedly excellent. Became.

In particular, in the surface protective sheet of Example 2, the surface protective layer has an absorption wavelength range peak (240 nm) at a position different from the ultraviolet absorption wavelength range peak (305 nm, 345 nm) of the ultraviolet absorbing resin by at least 20 nm. Since the photopolymerization initiator was used, the ultraviolet curable coating could be sufficiently cured, and the surface protective layer could exhibit extremely excellent hard coat properties.

On the other hand, since the surface protective sheet of Comparative Example 1 contains no ultraviolet absorbing substance in the surface protective layer and does not have an ultraviolet absorbing function, the light resistance of the display plate, especially after the light resistance accelerated test is tested. Hard coat property and adhesiveness of the surface protection layer of
Was extremely inferior about.

Further, the surface protective sheet of Comparative Example 2 contained a low molecular weight ultraviolet absorber in the surface protective layer, so that there was no problem in the light resistance of the display plate, but the low molecular weight ultraviolet absorber was used. Is seen to be a decrease in hard coat property and adhesiveness which is considered to be caused by bleeding at the surface of the surface protective layer and the interface with the transparent polymer film, and in particular, bleeding is also promoted over time after the light resistance accelerated test. The decrease was remarkable and the durability was poor.

Further, since the surface protective sheet of Comparative Example 3 used the undercoat layer containing the low molecular weight ultraviolet absorber, there was no problem in the light resistance of the display board, but the low molecular weight ultraviolet absorber was inferior. There is a decrease in adhesiveness that is considered to be caused by bleeding at the interface between the coating layer and the transparent polymer film and the surface protective layer, and in particular, the decrease is remarkable because bleeding is promoted over time after the light resistance accelerated test. It appeared and was inferior in durability. Further, the hard coat property of the surface protective layer, which is considered to be caused by the thickness of about 1 μm of the subbing layer provided for exhibiting a sufficient ultraviolet absorbing function, is also observed, and in the same manner as in Comparative Example 1, in the surface protective layer. Since the surface protective layer itself does not contain an ultraviolet absorbing substance, the light resistance of the surface protective layer itself was extremely low, and the durability of the hard coat property of the surface protective layer after the accelerated test was extremely poor.

[0057]

EFFECTS OF THE INVENTION According to the present invention, the surface protection which is excellent in the ultraviolet absorption as a surface protection sheet, the adhesion between the transparent polymer film and the surface protection layer, and the hard coat property of the surface protection layer is excellent. You can get a sheet.
In particular, such an effect remarkably appears over time and is excellent in durability.

Further, a photopolymerization initiator having an absorption wavelength range peak at a position different from the absorption wavelength range peak of the ultraviolet absorption resin by at least 20 nm or more is used together with the ultraviolet curable coating material and mixed with the ultraviolet absorption resin. A surface protective sheet with a surface protective layer formed by coating a transparent polymer film with a working solution and irradiating it with ultraviolet rays forms a surface protective sheet that has an extremely excellent hard coat property due to the fact that the ultraviolet curable coating is sufficiently cured. And a surface protective layer having

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09F 3/02 G09F 3/02 B 15/00 15/00 E (72) Inventor Susumu Kurishima Saitama City, Saitama Prefecture Suzutani 4-chome No. 6-35 stock company F-term in the Kimoto Technology Development Center (reference) 4F100 AK01A AK01B AK25B AK42 AL05B AS00B CA02 CC02B EH46 EH462 EJ08 EJ082 EJ86 EJ862 GB90 JB14 FA01 CHBJ FABJ FABJ FABJCHB JL11BJF01 JA08JBJFABJJ01JA01 FA281 JA32 JA55 JC02 JC04 KA03 KA12 NA11 NA12 NA19 PA17 PB14 PC08 4J100 AL03P AL03R AL08P AL08Q BA03P BA03Q BC43P BC43Q BC73P BC73Q CA03 JA01 JA32

Claims (4)

[Claims] 1. A surface protective sheet having a transparent surface protective layer on the surface of a transparent polymer film, wherein the surface protective layer contains an ultraviolet absorbing resin and an ultraviolet curable resin. A surface protection sheet characterized in that 2. The ultraviolet absorbing resin comprises 2- (2'-hydroxy-) as a monomer component having an ultraviolet absorbing group.
The surface protective sheet according to claim 1, which is an ultraviolet absorbing acrylic resin containing 5'-methacryloxyethylphenyl) -2H-benzotriazole. 3. The ultraviolet curable resin is cured by irradiation with ultraviolet rays by using a photopolymerization initiator in combination with an ultraviolet curable coating material in which one or more kinds of photopolymerizable prepolymers or photopolymerizable monomers are mixed. The surface protective sheet according to claim 1, wherein the surface protective sheet is formed by: 4. The photopolymerization initiator according to claim 3, wherein the photopolymerization initiator has an absorption wavelength range peak at a position different from the absorption wavelength range peak of the ultraviolet absorbing resin by at least 20 nm or more. Surface protection sheet.