JP2002240203A - Releasing base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a release base capable of preventing a transfer of a silicone curing inhibiting substance contained in a base to a silicone release layer, having an ultraviolet curable filter layer capable of dealing with a printer having an ultraviolet curing unit and further exhibiting stable release load to an adhesive substance with time. SOLUTION: The release base comprises the filter layer made of the ultraviolet curable filter layer (B) and a silicone release layer made of a cationic polymerizable ultraviolet curable silicone release agent (C), sequentially laminated on at least one surface of the base (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an intermediate between a base material such as a plastic film and paper and a silicone release layer made of a cationically polymerizable UV-curable silicone, and to the base material and the silicone release layer. The present invention also relates to a release base material provided with a sealing layer having excellent adhesion.

[0002]

2. Description of the Related Art In general, a release substrate is produced by forming a silicone release layer made of a silicone release agent having a release property on an adhesive substance such as polyorganosiloxane on a substrate, and is used for sealing, labeling, etc. It is used for various applications. Conventionally, paper such as polyethylene laminated paper and glassine paper has been used as the substrate, but in recent years, plastic films made of polyethylene, polypropylene, polyethylene terephthalate, and the like have been widely used. Compared with paper, plastic films are particularly excellent in mechanical strength, transparency, dimensional stability, smoothness, cost, etc., and their demand is increasing year by year.

[0003] Further, silicone release agents are generally known to be of a thermosetting type, an ultraviolet curing type, an electron beam curing type, etc., depending on the curing means. Above all, compared with the other silicone release agents, the UV-curable silicone release agent is inexpensive in curing equipment, compact, and can save energy even in curing conditions, and can be applied to a plastic film substrate with poor heat resistance. Awarded for its benefits.

[0004] The UV-curable silicone release agents can be classified according to their curing mechanism, and are mainly classified into four types: cationic polymerization type, radical addition reaction type, hydrosilylation reaction type, and radical polymerization type. Above all, the cationically polymerizable UV-curable silicone (hereinafter referred to as “cationically polymerizable UV-curable silicone”) is not subject to curing inhibition by oxygen in the atmosphere, and must be cured under an inert gas atmosphere such as nitrogen gas. There are many advantages such as no peeling and small volume shrinkage after curing, so that the adhesiveness to the substrate is excellent, and the peeling load on the adhesive substance can be easily controlled from heavy peeling to light peeling. On the other hand, there is a disadvantage that the type of the base material used is restricted. Substrates such as plastic films and synthetic paper containing substances that inhibit the curing of cationically polymerizable UV-curable silicones (hereinafter, referred to as “silicone curing inhibitors”), such as amine compounds and basic substances, for the following reasons Not considered suitable. That is, such a silicone curing inhibitor is transferred from the substrate to the silicone release layer, or the silicone release layer is insufficiently cured,
The adhesion between the substrate and the silicone release layer may be reduced, and as a result, problems such as an increase in the peel load of the silicone release layer on the adhesive substance over time may occur.

[0005] In some cases, a release substrate is provided in which a printing layer made of an ultraviolet-curable printing ink is provided on a substrate, and a cation-polymerizable ultraviolet-curable silicone release layer is further formed thereon. The same problem as described above may also occur when the ultraviolet curing type printing ink contains the silicone curing inhibitor.

As one means for overcoming such disadvantages, for example, Japanese Patent Application Laid-Open No. 10-364789 discloses the transfer of a silicone curing inhibitor contained in the above-mentioned substrate or ultraviolet-curable printing ink to a silicone release layer. In order to prevent this, a method is disclosed in which a filler layer made of a polyester resin is provided on a base material or a printed base material. According to this method, the curability of the silicone release layer and the adhesion between the substrate and the silicone release layer are improved.

However, according to this means, a high-viscosity polyester resin must be used after being diluted with a solvent, so that a step of drying the sealing layer made of the polyester resin is required. In particular, when a printing layer made of an ultraviolet-curable printing ink is provided on a base material and a sealing layer made of the polyester resin is provided thereon, the printing is performed by a printing machine equipped with an ultraviolet-curing device, and then the sealing is separately performed. A layer coating step and a drying step have to be added, and all the steps are complicated. In addition, the diluting solvent contained in the polyester resin may cause defects such as blurring and dissolution of the ultraviolet-curable printing ink. Furthermore, when the silicone release agent is used after being diluted with a solvent, the filler layer itself made of the polyester resin may be eroded by the solvent. In view of the problems described above, development of a new filler for a release substrate is currently demanded.

[0008]

SUMMARY OF THE INVENTION In order to meet the above demand, the present invention can prevent the transfer of a silicone curing inhibitor contained in a substrate to a silicone release layer, and can correspond to a printing machine equipped with an ultraviolet curing device. It is an object of the present invention to provide a release base material having such an ultraviolet-curable sealing layer and further exhibiting a stable release load over time with respect to an adhesive substance.

[0009]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, provided a sealing layer made of a specific ultraviolet curable resin on at least one surface of the substrate,
Further, it has been found that a silicone release layer comprising a cationically polymerizable ultraviolet-curable silicone release agent is provided thereon to provide a release base material that solves all of the above-mentioned problems, thereby completing the present invention.

That is, the present invention relates to a silicone release agent comprising a UV-curable silicone release agent (C) and a filler layer composed of an ultraviolet-curable filler (B) on at least one surface of the substrate (A). The present invention relates to a release substrate characterized by sequentially laminating layers.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail. As the substrate (A) used for the release substrate of the present invention, various known materials can be used without any particular limitation, and examples thereof include paper, plastic, and plastic film. Specific examples of paper include polyethylene laminated paper, glassine paper, clay-coated paper, woodfree paper, coated paper, thermal paper, synthetic paper, and the like. Examples of the plastic include molded products such as polypropylene and polyethylene, and such plastic molded products include various molded products molded by an injection molding machine, and those molded into a sheet or a film depending on the application. These may be those having been subjected to a surface treatment such as a corona discharge treatment, a flame treatment, a plasma treatment, and an easy adhesion coating treatment. As the substrate (A) in the present invention, it is particularly preferable to use paper or a plastic film.

The ultraviolet-curable filler (B) constituting the release substrate of the present invention is a monomer and / or oligomer containing an unsaturated bond capable of radical polymerization and at least one or more hydroxyl group in the molecule. b-1) (hereinafter simply referred to as “component (b-1)”) and a photoinitiator (b-
2). (B-1)
Since the component contains a hydroxyl group in the molecule, a filler layer composed of an ultraviolet-curable filler (B) and a silicone release layer composed of a base material (A) and a cationically polymerizable ultraviolet-curable silicone release agent (C) Therefore, it is considered that excellent adhesion is exhibited between the respective layers.

Specific examples of the component (b-1) include, for example, glycerin diepoxy (meth) acrylate, glycerin trypoxy (meth) acrylate, 1,6-hexanediol diepoxy (meth) acrylate, and neopentyl glycol diepoxy. (Meth) acrylate, bisphenol A epoxy (meth) acrylate, rosin epoxy acrylate (trade name “Beam Set 10
1 ", manufactured by Arakawa Chemical Industry Co., Ltd.) and oligomers composed of these monomers. These can be used alone or in combination of two or more.
(Note that (meth) acrylate means acrylate or methacrylate, and in the present invention, (meth) has the same meaning.) The amount of the component (b-1) used is (B) It is about 40 to 99% by weight, and preferably 65 to 99% by weight, based on the total weight of the ultraviolet curing filler. When the amount used is 40% by weight or less, the adhesion between (B) the sealing layer composed of the ultraviolet-curable sealing agent and (C) the silicone release layer composed of the cationically polymerizable ultraviolet-curing silicone releasing agent tends to decrease. It is in.

For the purpose of adjusting the viscosity of the ultraviolet-curable filler (B), a monomer and / or oligomer having at least one radically polymerizable unsaturated bond in the molecule (hereinafter referred to as a monomer or oligomer) may be used, if necessary. , "Reactive diluent") can be used in combination with the component (b-1). Specific examples of the reaction diluent include, for example, tripropylene glycol di (meth) acrylate, hexaethylene glycol di (meth) acrylate, trimethylolpropane triacrylate, hexanediol di (meth) acrylate, and nonanediol di (meth) acrylate. , Polyethylene glycol di (meth) acrylate, polyurethane (meth) acrylate, polyester (meth) acrylate, morpholine acrylamide, and the like, and these can be used alone or in combination of two or more. The amount of the component to be used is generally less than 60% by weight, preferably less than 40% by weight, based on the total weight of the ultraviolet-curable filler (B). 6 of the reactive diluent
When 0% by weight or more is used, the adhesion between the base material (A) and the sealing layer composed of the ultraviolet-curable sealing agent (B), and the sealing layer and (C) the cationically polymerizable ultraviolet-curing agent are used. Adhesion with a silicone release layer made of a silicone release agent is reduced, and a release substrate having the intended performance of the present invention cannot be obtained.

The photoinitiator (b-2) is indispensable for curing the ultraviolet-curable filler (B) with ultraviolet rays,
Various known materials can be used without particular limitation. Specific examples of the photoinitiator (b-2) include, for example, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate,
Phenylbenzophenone, trimethylbenzophenone,
Benzophenone photoinitiators such as hydroxybenzophenone; acetophenone photoinitiators such as phenoxydichloroacetophenone, butyldichloroacetophenone, diethoxyacetophenone, hydroxymethylphenylpropanone, isopropylphenylhydroxymethylpropaneon, and hydroxycyclohexylphenyl ketone; thioxanthon, chlor Thioxanthone-based photoinitiators such as thioxanthone, methylthioxanthone, isopropylthioxanthone, dichlorothioxanthone, diethylthioxanthone, diisopropylthioxanthone, dichlorothioxanthone, diethylthioxanthone, and diisopropylthioxanthone; anthraquinone, benzyl, benzylmethylketal, and the like; set Together it can be used. The amount of the photoinitiator (b-2) is not particularly limited, but is usually about 1 to 20% by weight, preferably 5 to 20% by weight, based on the total weight of the ultraviolet-curable filler (B). 15% by weight. When the amount of the photoinitiator (b-2) used is less than 5% by weight, (B) the curability of the sealing layer comprising the ultraviolet-curable sealing agent is insufficient, and when it is more than 15% by weight, Since the cost of the photoinitiator (b-2) is high, the release substrate of the present invention cannot be provided at low cost.

The ultraviolet-curing filler (B) includes:
In addition to the essential components (b-1) and the photoinitiator (b-2), polymerization inhibitors, antioxidants, ultraviolet absorbers, light stabilizers, defoamers, leveling agents, pigments, A photosensitizer or the like for improving the reactivity of the photoinitiator (b-2) can be appropriately used without departing from the object of the present invention.

The cationically polymerizable ultraviolet-curable silicone release agent (C) constituting the release substrate of the present invention includes various known polyorganosiloxanes having an epoxy functional group in the molecule and various known onium salts. Refers to a mixture composed of a photoinitiator. When mixing both, considering the compatibility and uniform mixing, the onium salt-based initiator is preferably dissolved or dispersed in an organic solvent and mixed with the polyorganosiloxane. Specific examples of the organic solvent used include:
Alcohol solvents such as isopropyl alcohol and n-butanol; ketone solvents such as acetone and methyl ethyl ketone; aromatic solvents such as toluene and xylene; ester solvents such as butyl lactate and ethyl acetate.

The polyorganosiloxane having an epoxy functional group in the molecule (hereinafter referred to as "polyorganosiloxane") has at least two epoxy functional groups in one molecule, and has a linear structure. , Branched chains or mixtures thereof. The type of the epoxy functional group contained in the polyorganosiloxane is not particularly limited, but may be any as long as the ring-opening cationic polymerization proceeds with the onium salt-based photoinitiator. Specifically, a γ-glycidyloxypropyl group, β- (3,4
-Epoxycyclohexyl) ethyl group, β- (4-methyl-3,4 epoxycyclohexyl) propyl group and the like. Such polyorganosiloxanes are commercially available, and include, for example, "Silicolyse POLY201" manufactured by Rhodia.

As the onium salt-based photoinitiator, various known ones can be used without particular limitation. As specific examples, (R ¹ ) ₂ I ⁺ X ⁻ , ArN ₂ ⁺ X ⁻ , (R ¹ ) ₃
S ⁺ X ⁻ , (R ¹ represents an alkyl group and / or an aryl group, Ar represents an aryl group, and X ⁻ represents [B (C ₆ H ₅ ) ₄ ].
⁻ , [B (C ₆ F ₅ ) ₄ ] ⁻ , [B (C ₆ H ₄ CF ₃ ) ₄ ]
⁻ , [(C ₆ F ₅ ) ₂ BF ₂ ] ⁻ , [C ₆ F ₅ BF ₃ ] ⁻ ,
[B (C ₆ H ₃ F ₂ ) ₄ ] ⁻ , BF ₄ ⁻ , PF ₆ ⁻ , As
F ₆ ⁻ , SbF ₆ ⁻ , SbCl ₆ ⁻ , HSO ₄ ⁻ , or ClO ₄ ⁻ ). Among them, (R ¹ ) ₂ I
⁺ X ^- a compound represented by are preferred. Such onium-based photoinitiators are commercially available, and include, for example, "Silicolyse CATA211" manufactured by Rhodia. The amount of the onium salt-based photoinitiator to be used is not particularly limited, but the polyorganosiloxane 100
Desirably, the amount is about 0.1 to 8 parts by weight based on parts by weight. If the amount is less than 0.1 parts by weight, the silicone release layer may be insufficiently cured. If it is more than 8 parts by weight, it is not practical in terms of cost. In addition, various known photosensitizers may be used in combination in order to improve the reactivity of the onium salt-based photoinitiator. Specific examples of the photosensitizer include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone,
4-dichlorothioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone and the like.

The cation-polymerizable ultraviolet-curable silicone release agent (C) may contain various known additives, if necessary.
For example, a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a solvent, an antifoaming agent, a leveling agent, a pigment, and the like can be added. In some cases, a silicon compound or the like may be contained within a range not departing from the object of the present invention.

Next, the method for producing a release substrate according to the present invention will be described. The release substrate of the present invention is formed by applying an ultraviolet-curable filler (B) onto the substrate (A) and then curing the filler using a known ultraviolet curing system to form a filler layer. Then, a cationically polymerizable ultraviolet-curable silicone release agent (C) is applied thereon and then cured using a known ultraviolet-curing system to form a silicone release layer. Here, if the UV-curable resin-based filler (B) and the cationically polymerizable UV-curable silicone release agent (C) are simultaneously cured to obtain a release substrate, the reason is not clear. The ultraviolet-curable silicone release agent (C) does not cure well and is in an uncured state, so that it is difficult to obtain a release substrate intended for the present invention.

When applying the UV-curable filler (B) and the cationically polymerizable UV-curable silicone release agent (C), for example, a roll coater, a Meyer bar, a wire bar, a blade coater, an air knife coater or the like may be used. Method can be adopted. The UV-curable filler (B) and the cationically polymerizable UV-curable silicone release agent (C) can be diluted with an organic solvent if necessary for the purpose of improving coatability. In order to eliminate the drying step, it is preferable to apply the ultraviolet-curable sealing agent (B) serving as the sealing layer of the release substrate of the present invention without a solvent. The diluting solvent is not particularly restricted but includes ester solvents such as methyl acetate, ethyl acetate, isopropyl acetate, butyl acetate, amyl acetate, ethyl formate, butyl propionate, methoxypropyl acetate; methanol, ethanol, propanol, butanol, Alcohol solvents such as ethylhexanol, ethylene glycol and methoxypropanol; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; ether solvents such as dioxane, diethyl ether and tetrahydrofuran; cellosolve acetate, ethyl cellosolve, butyl cellosolve and the like Cellosolve solvents: toluene, xylene, Solvesso # 10
0 (trade name, manufactured by Exxon), Solvesso # 150 (trade name, manufactured by Exxon), etc .; various solvents such as hexane, heptane, octane, decane, etc. It can be used as appropriate. Among them, ethyl acetate, lower alcohol,
Acetone, methyl ethyl ketone and the like are preferred. One or more of these organic solvents may be used.

UV-curable sealing applied on substrate (A)
The amount of the coating agent (B) varies depending on the type of the base material (A).
But usually 0.1 to 10 g / m²Degree, more preferably
1.5 to 2.5 g / m²It is. Also, cationically polymerizable
0.1 to 10. UV-curable silicone release agent (C).
0 g / m²Degree, more preferably 0.5 to 2.5 g / m
²It is. UV curable filler (B) and cationic weight
What is the coating amount of the compatible UV-curable silicone release agent (C)?
If it is smaller than the lower limit, a stable peeling load is
Problems, such as difficulty in obtaining a release base material,
If it is larger than the upper limit, the manufacturing cost will be high and uneconomical.
You.

[0025]

Since the release substrate of the present invention has a filling layer made of a specific ultraviolet-curable resin, the release load of the silicone release layer on the adhesive substance changes little with time. Further, since the release substrate has the filling layer, there is no restriction on the type of the substrate to be used, including the substrate containing the silicone curing inhibitor. In addition, since the sealing layer of the release substrate is made of a specific ultraviolet-curable resin that can be used without a solvent, a drying step of the sealing layer is unnecessary, and the release substrate is used in a printing machine equipped with an ultraviolet curing device. Can be manufactured. Further, the filling layer and the silicone release layer constituting the release substrate are excellent in curability and adhesion, respectively.

[0026]

The present invention will be described below in detail with reference to examples and comparative examples. In each example, parts and% are based on weight unless otherwise specified.

Example 1 35 parts by weight of glycerin diepoxy acrylate as a component (b-1) and rosin epoxy acrylate (Arakawa Chemical Industries, Ltd.) were placed in a 200 ml flask equipped with a stirrer, a thermometer, and a condenser under light shielding. (Trade name "Beamset 101"), 30 parts by weight of a mixture, 35 parts by weight of hexaethylene glycol diacrylate as a reactive diluent, and (b-2) 1-
10 parts by weight of hydroxycyclohexyl phenyl ketone (trade name “Irgacure 184”, manufactured by Ciba Specialty Chemicals Co., Ltd.) is charged, and then heated to 50 to 60 ° C. with stirring, and stirred and mixed within the same temperature range for 30 minutes. Continued. Thereafter, the mixture was cooled to room temperature to obtain (B) an ultraviolet curable sealant.

Example 2 In Example 1, the component (b-1) was added to a mixture of 30 parts by weight of hexanediol diepoxy acrylate and 60 parts by weight of bisphenol A epoxy acrylate, and hexaethylene glycol diacrylate was used as a reactive diluent. An ultraviolet-curable sealant (B) was obtained in the same manner as in Example 1 except that the mixture was changed to 10 parts by weight.

Example 3 An ultraviolet-curable filler (B) was obtained in the same manner as in Example 1 except that the component (b-1) was changed to 100 parts by weight of hexanediol epoxy acrylate.

Comparative Example 1 The procedure of Example 1 was repeated except that the component (b-1) was changed to 30 parts by weight of hexanediol diepoxy acrylate and 70 parts by weight of hexaethylene glycol diacrylate as a reactive diluent. In the same manner, an ultraviolet curable sealant (B) was obtained.

(Test 1: Preparation and evaluation of a sample to be subjected to a test of the curing property of the filling layer and the adhesion to the substrate (A)) Synthetic paper using polypropylene as a main material as the substrate (A) (trade name) "Yupo SGS80", manufactured by Oji Yuka Synthetic Paper Co., Ltd.), on which the various UV-curable sealants (B) obtained in Examples 1 to 3 and Comparative Example 1 were cured. Coating machine (product name "RI
-2 type printability tester ", manufactured by Ishikawajima Sangyo Kikai Co., Ltd.)
And a UV irradiation device (trade name “variable output type UV conveyor system, CV-110Q-E”, manufactured by Fusion UV Systems Japan Co., Ltd .; light source unit I600, H bulb, 240 W / cm ² , lamp output) 100%, height of the lamp from the surface of the substrate (A) 53m
m, belt speed 30 m / min; irradiation dosimeter (trade name “UV
-330A1 ", manufactured by Oak Manufacturing Co., Ltd .; UV irradiation dose: about 28 mj / cm ² )) and cured to form a sample. Each of the obtained samples was evaluated according to the following criteria. Table 1 shows the results. (Curability: evaluation of the tack of the filling layer by finger touch) ・ ・ ・: There is no tack, and the curability is sufficient. X: Strong tackiness and insufficient curability. (Adhesion: Evaluate the degree of detachment of the filler layer when the surface of the filler layer is strongly rubbed five times with a finger) ... There is no detachment, and the adhesiveness is sufficient. ×: There is falling off and adhesion is insufficient.

(Test 2: Preparation and evaluation of a sample (release substrate) to be subjected to a test of the curability of the silicone release layer and adhesion to the filling layer; and preparation and evaluation of a release substrate having no filling layer) On the filling layer of the sample obtained in Test 1, 100 parts by weight of a cationic ultraviolet-curable silicone release agent (C) (trade name “Silicolyse POLY201”, manufactured by Rhodia) was added to an onium-based photoinitiator (trade name) "Silico Lease CATA211", manufactured by Rhodia)
5 parts by weight (non-volatile content 18%) was added, and the mixture was thoroughly stirred and mixed) using a commercially available coating machine used in Test 1 so that the film thickness after curing was 1 μm. Using the commercially available ultraviolet irradiator used in 1 under the same conditions as in Test 1, a test sample (release substrate) having a silicone release layer was obtained. For comparison with the test sample (release substrate) having a filling layer and a silicone release layer, the cationic UV-curable silicone release agent (C) was directly applied on the substrate (A) used in Test 1. ) Was applied and cured to prepare a test sample (peeling substrate) having no sealing layer (this is referred to as Comparative Example 2). Using each of the obtained samples, a test was performed according to the following criteria. Table 1 shows the results. (Curability: Visual evaluation of the surface state after gently rubbing the surface of the silicone release layer with a finger) ··· Sufficient curing without leaving traces of rubbing. ×: Rubbing marks remain and curing is insufficient. (Adhesion: Evaluate the detachment when the silicone release layer surface is rubbed five times with a finger) ○: No detachment, adhesion is sufficient. ×: There is falling off and adhesion is insufficient.

(Test 3: Evaluation of release performance) Yellow release paper of double-sided adhesive tape (trade name “No. 502 tape”, manufactured by Nitto Denko Corporation) was applied to the silicone release layer of each release substrate prepared in Test 2. Were peeled off and left at 25 ° C. under a load of 20 g / cm ² . 1 day later, and 7
Days later tensile tester (trade name “Tensilon UCT-50”
0 ", manufactured by Orientec Co., Ltd., and peeled off the double-sided pressure-sensitive adhesive tape bonded at an angle of 180 ° at a peeling speed of 0.3 m / min, and the force required for peeling (g / 50 m).
By measuring m), the load at the time of peeling and the change with time of the peeling load were evaluated. Table 1 shows the results.

[0034]

[Table 1]

From the above results, it was found that the release base material of the present invention exerts a stable release load with time because it has a filler layer composed of the ultraviolet curing filler (B) in the middle. Further, the sealing layer composed of the ultraviolet-curable sealing agent (B) constituting the release substrate is in close contact with the silicone release layer composed of the substrate (A) and the cationically polymerizable ultraviolet-curing silicone releasing agent (C). It was also confirmed that the filling layer and the silicone release layer had excellent curability.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 4/06 C09D 4/06 5/20 5/20 183/04 183/04 F-term (Reference) 4F100 AH02 AK01A AK25 AK52C AR00B AT00A CA30B DG10A JB14B JB14C JL14C YY00B 4J011 QA13 QA22 QA24 QB19 QB20 QB28 SA01 SA21 SA24 SA29 SA41 SA51 SA63 SA64 SA87 UA01 VA01 4J027 AB01 FA03 BA01 FA03 BA01 FA02 BA02 KA03 MA07 MA10 NA10 NA12 NA25 PA17 PB02 PB04 PC08 PC10

Claims (3)

[Claims] 1. A filler layer comprising an ultraviolet-curable filler (B) and a silicone release layer comprising a cationically polymerizable ultraviolet-curable silicone release agent (C) on at least one surface of a substrate (A). A release substrate characterized by being sequentially laminated. 2. The ultraviolet-curable filler (B) comprises a monomer and / or oligomer (b-1) containing a radically polymerizable unsaturated bond and at least one or more hydroxyl group in a molecule thereof in an amount of from 40 to 99. The release substrate according to claim 1, which contains 1 to 20% by weight of a photoinitiator (b-2) in addition to 1% by weight. 3. The release substrate according to claim 1, wherein the substrate (A) is a plastic film or paper.