WO2016031472A1

WO2016031472A1 - Photocurable composition, temporary fixing agent, and method for temporarily fixing article to be bonded

Info

Publication number: WO2016031472A1
Application number: PCT/JP2015/071370
Authority: WO
Inventors: 容利野上
Original assignee: スリーボンドファインケミカル株式会社
Priority date: 2014-08-28
Filing date: 2015-07-28
Publication date: 2016-03-03
Also published as: JPWO2016031472A1; JP6604329B2

Abstract

The present invention relates to a photocurable composition comprising components (A) to (E), wherein the component (D) is contained in an amount of more than 0 part by mass and not more than 30 parts by mass relative to 100 parts by mass of the component (A), wherein the component (A) is a compound having a (meth)acrylic group, the component (B) is an acrylamide compound, the component (C) is water, the component (D) is an expandable capsule which can start to expand at a temperature of 70 to 95ºC, and the component (E) is a photopolymerization initiator. According to the present invention, a photocurable composition is provided, which is suitable for the temporary fixation of a large-area plate-like article of interest by the irradiation with light in the temporary fixation of the article by bonding even when the article is used at a narrow clearance, and which can be removed easily after a processing operation or the like of the article without requiring the dissolution or expansion of the photocurable composition.

Description

Photocurable composition, temporary fixing agent, and method for temporarily fixing adherend

The present invention relates to a photocurable composition suitable for temporarily fixing an adherend when used in processing steps such as polishing and cutting, a temporary fixing agent, and a method for temporarily fixing an adherend. More specifically, the present invention relates to a method of fixing an adherend with a photocurable composition, irradiating the photocurable composition with energy rays and curing it, and curing the cured product in a medium at 90 to 200 ° C. after the operation. The present invention relates to a photocurable composition that can be peeled off without dissolving.

Conventionally, as a temporary fixing agent using acrylamide, a water-soluble temporary fixing agent as disclosed in JP 2011-148842 A is known, and since the temporary fixing agent dissolves, the peelability from the adherend is known. Is good. This is a temporary fixing agent applying the property that acrylamide is highly soluble in water. However, since the temporary fixing agent component remains on the adherend surface, it has been necessary to perform cleaning carefully. Moreover, contamination of water as a medium is likely to proceed, and it is necessary to frequently exchange water.

Furthermore, Japanese Patent Application Laid-Open No. 2007-326917 describes an invention of a photocurable composition (active energy ray curable resin composition) to which a thermally expandable capsule is added. In this document, the photocurable composition is cured between two adherends, and this is immersed in hot water to check the peelability. However, the conditions evaluated in the examples of Japanese Patent Application Laid-Open No. 2007-326917 are as follows: the adherend has a small adhesive area of 26 mm × 70 mm, and the clearance (interval between adherends) is as wide as 200 μm. As described above, when the clearance is wide, moisture easily enters the cured product, and when the adhesion area is small, it is easily peeled off when the adherend is temporarily fixed. In addition, since the photocurable composition disclosed in Japanese Patent Application Laid-Open No. 2007-326917 has a large amount of thermally expandable capsules, the cured product after exfoliation expands too much in the exfoliation medium. Expected to go up.

In addition, in order to peel the cured product of the photocurable composition with hot water at a temperature lower than 90 ° C., it cannot be peeled unless the adhesive strength to the adherend is weakened. On the other hand, however, if the adhesive strength is too weak, there is a risk that peeling will occur in processing operations such as cutting and polishing.

As described above, according to the conventional photocurable composition, when a plate-shaped adherend having a relatively small area is bonded with a wide clearance, it can be easily peeled off after temporary fixing. is there. However, in particular, when performing temporary fixing of a large-area plate-shaped adherend with a narrow clearance, while maintaining sufficient adhesive strength, after the work of processing the adherend performed after temporary fixing, It was difficult to peel off easily. Specifically, it was difficult to easily peel the cured product without dissolving it in the medium and without the cured product expanding.

Therefore, the present invention is suitable for temporarily fixing a plate-shaped adherend having a large area by adhesion, even when it is used with a narrow clearance, and performs a processing operation of the adherend. Then, it aims at providing the photocurable composition which can be easily peeled without melt | dissolution and expansion | swelling. Another object of the present invention is to provide a temporary fixing agent and a method for temporarily fixing an adherend using the photocurable composition.

As a result of intensive studies aimed at achieving the above object, the present inventors have completed the present invention relating to a photocurable composition suitable for temporary fixation.

The gist of the present invention will be described below. The first embodiment of the present invention includes the following components (A) to (E), the amount of the following component (D) is more than 0 parts by weight and less than 30 parts by weight with respect to 100 parts by weight of the following (A) component: A photocurable composition containing in proportions:
(A) component: a compound having a (meth) acryl group;
(B) component: acrylamide compound;
(C) component: water;
(D) component: an expandable capsule having a temperature at which expansion starts to 70 to 95 ° C .; and (E) component: a photopolymerization initiator.

The second embodiment of the present invention is the photocurable composition according to the first embodiment, wherein the component (D) is an expandable capsule that encloses a liquid hydrocarbon compound at 25 ° C.

In a third embodiment of the present invention, the proportion of the component (B) and the component (C) is more than 0 parts by mass and not more than 20 parts by mass with respect to 100 parts by mass of the component (A). The photocurable composition according to the first or second embodiment.

The fourth embodiment of the present invention is the photocuring according to any one of the first to third embodiments, further comprising a (meth) acrylic (co) polymer that is liquid at 25 ° C. as the component (F). Composition.

5th embodiment of this invention is described in 4th embodiment which contains the said (F) component in the ratio of more than 0 mass part and 20 mass parts or less with respect to 100 mass parts of said (A) component. It is a photocurable composition.

A sixth embodiment of the present invention is the photocurable composition according to any one of the first to fifth embodiments, wherein the component (A) includes a compound having a hydroxyl group and a (meth) acryl group. is there.

The seventh embodiment of the present invention is the photocurable composition according to any one of the first to sixth embodiments, further comprising a spacer.

The eighth embodiment of the present invention is a temporary fixing agent comprising the photocurable composition according to any one of the first to seventh embodiments.

According to a ninth embodiment of the present invention, there is provided a cured product obtained by curing the photocurable composition according to any one of the first to seventh embodiments or the temporary fixing agent according to the eighth embodiment. It is a method for temporarily fixing an adherend, which comprises immersing the substrate in a medium at a temperature of not lower than ° C. to peel the cured product from the adherend.

Details of the present invention will be described below.

≪Photocurable composition≫
The photocurable composition of the present invention contains the following components (A) to (E), and the amount of the following component (D) exceeds 30 parts by mass with respect to 100 parts by mass of the following (A) component. A photocurable composition containing in proportions:
(A) component: a compound having a (meth) acryl group;
(B) component: acrylamide compound;
(C) component: water;
(D) component: an expandable capsule having a temperature at which expansion starts to 70 to 95 ° C .; and (E) component: a photopolymerization initiator.

The photocurable composition according to the present invention improves releasability by combining the (B) component and the (C) component. In addition, since the component (D) is included, the peelability is improved due to the expansion of the component (D). From the above, the photocurable composition of the present invention has excellent peelability (it becomes easy to peel after temporary fixing). In addition to the components (B) to (D), the components (A) and (E) are further included, so that the photocurable composition according to the present invention can be cured by light irradiation. . Therefore, the photocurable composition according to the present invention can be easily peeled while maintaining a sufficient adhesive strength even when a large-area adherend is bonded with a narrow clearance. That is, the photocurable composition of the present invention is suitable for temporarily fixing a plate-shaped adherend having a large area to another adherend with a narrow clearance by light irradiation. Yes.

More specifically, the photocurable composition according to the present invention not only prevents the adherend from peeling off even during the processing of the adherend performed after the adherend is bonded, After the processing operation, the cured product is peeled as it is without dissolving the cured product in a medium at 90 ° C. or higher (preferably 90 to 200 ° C.). In the technique disclosed in Japanese Patent Application Laid-Open No. 2011-148842, the temporary fixing agent component remains on the surface of the adherend when removing the temporary fixing agent. Further, when removing the temporary fixing agent, water as a medium is easily contaminated, and it is necessary to frequently exchange water. When only the component (B) contained in the photocurable composition of the present invention is used, the formed cured product is dissolved in water, but is simultaneously contained in the photocurable composition of the present invention (A). Since the component can undergo a crosslinking reaction, the entire cured product has low solubility in water. Therefore, since the dissolution in a medium such as water is suppressed, the above inconvenience can be solved.

Furthermore, since the photocurable composition disclosed in JP-A-2007-326917 contains a large amount of thermally expandable capsules, the cured product after peeling excessively expands in the peeling medium. In such a case, workability may be reduced. On the other hand, since the photocurable composition according to the present invention contains the component (D) at a specific mass ratio (over 0 parts by mass to 30 parts by mass or less with respect to 100 parts by mass of the component (A)), Such inconvenience can also be solved.

However, the above mechanism is speculation, and the technical scope of the present invention is not limited by the above mechanism.

Hereinafter, the constituent components of the photocurable composition of the present invention will be described in detail.

<(A) component: Compound having (meth) acrylic group>
The component (A) that can be used in the present invention is a compound having an acryl group and / or a methacryl group. Hereinafter, the acrylic group and the methacryl group are collectively referred to as a (meth) acryl group. (A) A component does not contain the acrylamide compound which is (B) component explained in full detail below, and the (meth) acrylic polymer which is (F) component.

The component (A) is not particularly limited as long as it is a compound having one or more (meth) acryl groups, but it is preferable that the compatibility of the components (B) and (C) of the present invention is good. The component (A) can contain a (meth) acrylate oligomer component and / or a (meth) acrylate monomer component.

((Meth) acrylate oligomer component)
In the present invention, the “(meth) acrylate oligomer” is different from the (meth) acrylic (co) polymer as the component (F) described in detail below. More specifically, the “(meth) acrylate oligomer” is not a (co) polymer having, as a repeating unit, a structural unit derived from a monomer having a (meth) acrylic group as the component (F), For example, the following can be mentioned.

Specific examples of the (meth) acrylate oligomer include (meth) acrylate oligomer having an ester bond in the molecule, (meth) acrylate oligomer having an ether bond, (meth) acrylate oligomer having a urethane bond, and epoxy-modified (meth) acrylate. Examples thereof include, but are not limited to, bisphenol A, novolac phenol, polybutadiene, polyester, polyether, and the like. Among the above, the (meth) acrylate oligomer component is at least selected from the group consisting of a (meth) acrylate oligomer having an ester bond in the molecule, a (meth) acrylate oligomer having an ether bond, and an epoxy-modified (meth) acrylate oligomer. It is preferable to include one kind.

The component (A) that can be used in the present invention further includes a substituent other than the (meth) acrylic group, such as a compound having one or more epoxy groups and one or more acrylic groups in one molecule. Also included are compounds. When the component (A) contains a compound having two or more (meth) acrylic groups, the cured product to be formed tends to be hard and brittle, and it is easier to peel off (meth) acrylate. The oligomer component preferably contains an oligomer having two or more (meth) acryl groups (a bifunctional or more (meth) acrylate oligomer).

As (meth) acrylate oligomers having an ester bond, those in which an ester bond is formed by synthesis of a polyol and a polyvalent carboxylic acid and acrylic acid is added to an unreacted hydroxyl group are known. The method is not limited. Specific examples include Aronix (registered trademark) M-6100, M-6200, M-6250, M-6500, M-7100, M-7300K, M-8030, M-8060, M manufactured by Toa Gosei Co., Ltd. -8100, M-8530, M-8560, M-9050, etc. include, but are not limited to, UV-3500BA, UV-3520TL, UV-3200B, UV-3000B, etc. manufactured by Nippon Synthetic Chemical Industry Co., Ltd. It is not something.

As (meth) acrylate oligomers having an ether bond, those obtained by adding acrylic acid to a hydroxyl group of polyether polyol or an aromatic hydroxyl group such as bisphenol are not limited to this synthesis method. Absent. Specific examples include UV-6640B, UV-6100B, UV-3700B manufactured by Nippon Synthetic Chemical Industry, and light (meth) acrylates 3EG-A, 4EG-A, 9EG-A, 14EG- manufactured by Kyoeisha Chemical Co., Ltd. A, PTMGA-250, BP-4EA, BP-4PA, BP-10EA, etc. include, but are not limited to, EBECRYL (registered trademark) 3700 manufactured by Daicel Ornex Co., Ltd.

Known (meth) acrylate oligomers having a urethane bond include those in which a urethane bond is formed by a polyol and a polyisocyanate, and acrylic acid is added to an unreacted hydroxyl group. However, the synthesis method is limited to this. Is not to be done. Specific examples include AH-600, AT-600, UA-306H, and UF-8001 manufactured by Kyoeisha Chemical Co., Ltd., but are not limited thereto.

Known epoxy-modified (meth) acrylate oligomers include those obtained by adding (meth) acrylic acid to an epoxy group. Specific examples include EBECRYL (registered trademark) 3700 manufactured by Daicel Ornex Co., Ltd., but are not limited thereto.

((Meth) acrylate monomer component)
The component (A) preferably contains not only the (meth) acrylate oligomer component but also a (meth) acrylate monomer component. As the (meth) acrylate monomer, a monomer having one or more (meth) acryl groups in the molecule can be used. Here, the (meth) acrylate monomer component has a (meth) acrylate monomer having a hydroxyl group in the molecule, a (meth) acrylate monomer having an ester bond in the molecule, a (meth) acrylate monomer having an ether bond, and a urethane bond. It is preferable to include at least one selected from the group consisting of (meth) acrylate oligomers and epoxy-modified (meth) acrylate monomers. Further, the (meth) acrylate monomer component is selected from the group consisting of a (meth) acrylate monomer having a hydroxyl group in the molecule, a (meth) acrylate monomer having an ester bond in the molecule, and a (meth) acrylate monomer having an ether bond. It is preferable to include at least one of the above. Furthermore, it is particularly preferable that the (meth) acrylate monomer component contains a (meth) acrylate monomer having a hydroxyl group.

Further, as the (meth) acrylate monomer, a monofunctional monomer, a bifunctional monomer, a trifunctional monomer, and a polyfunctional monomer other than these can be used.

Specific examples of the monofunctional monomer include (meth) acrylic acid, lauryl (meth) acrylate, stearyl (meth) acrylate, ethyl carbitol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl ( (Meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxydiethylene glycol (meth) acrylate , Phenoxytetraethylene glycol (meth) acrylate, nonylphenoxyethyl (meth) acrylate, nonylphenoxytetraethylene glycol ( ) Acrylate, methoxydiethylene glycol (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, butoxyethyl (meth) acrylate, butoxytriethylene glycol (meth) acrylate, 2-ethylhexyl polyethylene glycol (meth) acrylate, nonylphenyl polypropylene glycol (meth) ) Acrylate, methoxydipropylene glycol (meth) acrylate, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate (2-hydroxyethyl (meth) acrylate), 2-hydroxypropyl (meth) acrylate, glycerol (meta ) Acrylate, polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, Picohydrin (hereinafter abbreviated as ECH) modified butyl (meth) acrylate, ECH modified phenoxy (meth) acrylate, ethylene oxide (hereinafter abbreviated as EO) modified phthalic acid (meth) acrylate, EO modified succinic acid (meth) acrylate, caprolactone modified 2 -Hydroxyethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, morpholino (meth) acrylate, EO-modified phosphoric acid (meth) acrylate, etc. However, it is not limited to these.

Preferably, it is preferable that the component (A) contains a compound having a hydroxyl group and a (meth) acryl group because it not only exhibits an appropriate adhesive strength but also has an appropriate peelability. That is, it is preferable that the monofunctional (meth) acrylate monomer which has a hydroxyl group is contained in (A) component. Specific examples include 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate, but are not limited thereto.

In addition, together with a compound having a hydroxyl group and a (meth) acryl group, an ether bond such as ethyl carbitol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl (meth) acrylate as a monofunctional monomer It is more preferable that the (meth) acrylate monomer which it has is included.

Specific examples of the bifunctional monomer include 1,3-butylene glycol di (meth) acrylate, 1,4-butylene glycol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, neopentyl glycol di ( (Meth) acrylate, 1,6-hexane glycol di (meth) acrylate, ethylene glycol diacrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, EO Modified neopentyl glycol di (meth) acrylate, propylene oxide (hereinafter abbreviated as PO) modified neopentyl glycol di (meth) acrylate, bisphenol A di (meth) acrylate, EO modified bisphenol A di ( ) Acrylate, ECH modified bisphenol A di (meth) acrylate, EO modified bisphenol S di (meth) acrylate, hydroxypivalate ester neopentyl glycol di (meth) acrylate, caprolactone modified hydroxypivalate ester neopentyl glycol di (meth) Acrylate, neopentyl glycol modified trimethylolpropane di (meth) acrylate, stearic acid modified pentaerythritol di (meth) acrylate, dicyclopentenyl di (meth) acrylate, EO modified dicyclopentenyl di (meth) acrylate, diacryloyl isocyanurate However, it is not limited to these.

From the viewpoint of facilitating cross-linking and facilitating curing at the time of light irradiation, it is preferable that the component (A) contains a bifunctional monomer. At this time, the bifunctional monomer in the component (A) is more preferably tricyclodecane dimethanol di (meth) acrylate.

Specific examples of the trifunctional monomer include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, EO-modified trimethylolpropane tri (meth) acrylate, PO-modified trimethylolpropane tri (meth) acrylate, ECH Examples thereof include, but are not limited to, modified trimethylolpropane tri (meth) acrylate, ECH-modified glycerol tri (meth) acrylate, and tris (acryloyloxyethyl) isocyanurate.

Specific examples of the polyfunctional monomer include ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol monohydroxypenta (meth) acrylate, alkyl-modified dipentaerythritol penta (meth) acrylate, dipenta Examples include, but are not limited to, erythritol hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate.

The (meth) acrylate oligomer component and (meth) acrylate monomer component as the component (A) may be used alone or in combination of two or more. In addition, when multiple types of compounds are included as (A) component, content of (A) component shall point out these total amounts.

<(B) component: acrylamide compound>
The component (B) used in the present invention is an acrylamide compound. Specific examples of the component (B) include, but are not limited to, dimethylacrylamide, dimethylaminoethyl acrylate, acryloylmorpholine, and diethylacrylamide. Moreover, these may be used independently or may be used in mixture of 2 or more types. Considering price and availability, diethylacrylamide or dimethylacrylamide is preferable. Although the cause has not been elucidated, in the present invention, the combination of the component (B) and the component (C) improves the peelability. Specific examples of the component (B) include, but are not limited to, DMAA, ACMO, DEAA, and the like manufactured by KJ Chemical Co., Ltd.

The component (B) is preferably contained in an amount of 0.1 to 20 parts by mass with respect to 100 parts by mass of the component (A). More preferably, the component (B) is contained in an amount of 0.1 to 10 parts by mass. (A) With respect to 100 parts by mass of the component, if the component (B) is 0.1 parts by mass or more, the peelability is better, and if it is more than 0.1 parts by mass, the peelability is even better Become. On the other hand, when the component (B) is 20 parts by mass or less, it is easy to be compatible with other components, and when it is less than 20 parts by mass, it is more easily compatible with other components. Furthermore, from the viewpoint of achieving both releasability and compatibility with other components, the component (B) is more preferably 1 to 5 parts by mass with respect to 100 parts by mass of the component (A). preferable. In addition, when multiple types of compounds are included as (B) component, content of (B) component shall point out these total amounts.

<(C) component: water>
The component (C) that can be used in the present invention is water. Although tap water, purified water by a purification device, ion exchange water, distilled water, and the like can be used, from the viewpoint of low impurities, the component (C) is preferably purified water, ion exchange water, or distilled water. .

The component (C) is preferably contained in an amount of 0.1 to 20 parts by mass with respect to 100 parts by mass of the component (A). More preferably, the component (C) is 0.1 to 10 parts by mass. (C) When a component is 0.1 mass part or more, more favorable peelability can be maintained. Further, when the component (C) is more than 0.1 parts by mass, it is possible to maintain better peelability. On the other hand, when the component (C) is 20 parts by mass or less, compatibility with other components can be improved. When the component (C) is less than 20 parts by mass, the compatibility with other components can be further improved. Further, from the viewpoint of achieving both the maintenance of peelability and compatibility with other components, the component (C) is contained in an amount of 1 to 5 parts by mass with respect to 100 parts by mass of the component (A). And more preferred.

Furthermore, the total of the component (B) and the component (C) is preferably more than 0 parts by mass and 20 parts by mass or less with respect to 100 parts by mass of the component (A). Although the minimum in particular of these total amounts is not restrict | limited, It is more preferable in it being 1 mass part or more with respect to 100 mass parts of (A) component.

Furthermore, from the viewpoint of peelability and adhesive strength, it is preferable that the component (B) and the component (C) are contained in the same mass.

<(D) Component: Expandable Capsule with Expansion Starting Temperature of 70 to 95 ° C.>
The component (D) that can be used in the present invention is an expandable capsule having a temperature at which expansion starts from 70 to 95 ° C. From the standpoint of availability and practical viewpoint, the temperature at which expansion of the expandable capsule starts is preferably 70 ° C. or higher and 95 ° C. or lower. On the other hand, if the temperature at which expansion of the expandable capsule starts is more than 95 ° C., the peelability after temporary fixing decreases.

Preferably, the component (D) is an expandable capsule containing a hydrocarbon compound that is liquid at 25 ° C. In this specification, the temperature at which component (D) starts to expand is determined by measuring one expandable capsule by TMA (Thermo Mechanical Analysis), that is, measuring the linear expansion coefficient, and measuring the temperature at which expansion starts. Measured by The temperature range during the measurement was from room temperature (25 ° C.) to 220 ° C.

More specifically, as the component (D), a liquid hydrocarbon compound (hydrocarbon compound that easily gasifies and expands by heating) at 25 ° C. is contained in the shell (the outer shell is made of an elastic outer shell material). It is preferable to use a thermally expandable fine spherical substance encapsulated in ().

In particular, when the adherends are bonded together and temporarily fixed, it is easier to process when the cured product of the composition does not become thicker. Therefore, the average particle size of component (D) (before expansion) is preferably smaller. Specifically, it is 100 μm or less, more preferably 70 μm or less, even more preferably less than 70 μm, and particularly preferably 50 μm or less. On the other hand, the lower limit of the average particle diameter is not particularly limited, but considering availability, it is preferably 1 μm or more, more preferably 10 μm or more, and particularly preferably more than 10 μm. Specific examples of the component (D) include Expancel (registered trademark) 031-40DU manufactured by Nippon Philite Co., Ltd., but are not limited thereto.

In the photocurable composition according to the present invention, the component (D) is included in a proportion of more than 0 parts by mass and 30 parts by mass or less with respect to 100 parts by mass of the component (A). Preferably, the content of component (D) is 0.1 to 30 parts by mass with respect to 100 parts by mass of component (A). If the component (D) is not added, the releasability is lowered. If the component (D) is added in an amount of more than 30 parts by mass, the cured product at the time of peeling expands and bulges up, resulting in trouble in the peeling operation. Furthermore, from the viewpoint of achieving both releasability and workability, the component (D) is more preferably contained in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the component (A). Even more preferably. In addition, when several types of expansible capsule is included as (D) component, content of (D) component shall point out these total amounts.

<(E) component: Photopolymerization initiator (photocuring agent)>
The component (E) used in the present invention is a photopolymerization initiator. The photopolymerization initiator is not particularly limited as long as it is a radical photopolymerization initiator that generates radical species by energy rays such as visible light, ultraviolet rays, X-rays, and electron beams.

Specifically, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-morpholino (4-thiomethylphenyl) propan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone, 2-hydroxy Acetophenones such as -2-methyl-1- [4- (1-methylvinyl) phenyl] propanone oligomers; benzoins such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether; benzophenone o-Benzoylmethyl benzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyl-diphenyl sulfide, 3,3 ', 4,4'-tetra (t-butylperoxycarbonyl) benzophenone, 2,4,6 -Benzophenones such as 4-trimethylbenzophenone, 4-benzoyl-N, N-dimethyl-N- [2- (1-oxo-2-propenyloxy) ethyl] benzenemethananium bromide, (4-benzoylbenzyl) trimethylammonium chloride 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone, 2- (3-dimethylamino-2-hydroxy) -3,4 -Dimethyl-9H-thio Thioxanthone such as xanthone 9 Onmesokurorido including but not limited to this. Moreover, these may be used independently or may be used in mixture of 2 or more types.

A cationic photopolymerization initiator may be used in combination with the component (E) of the present invention. Specific examples of the cationic photopolymerization initiator include diazonium salts, sulfonium salts, iodonium salts, and the like. Specifically, benzenediazonium hexafluoroantimonate, benzenediazonium hexafluorophosphate, benzenediazonium hexafluoroborate, Triphenylsulfonium hexafluoroantimonate, triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroborate, 4,4′-bis [bis (2-hydroxyethoxyphenyl) sulfonio] phenyl sulfide bishexafluorophosphate, diphenyliodonium hexafluoro Antimonate, diphenyliodonium hexafluorophosphate, diphenyl-4-thiophenoxyphe It can be exemplified Le sulfonium hexafluorophosphate or the like, but is not limited thereto.

The component (A) is preferably contained in an amount of 0.1 to 10 parts by mass with respect to 100 parts by mass. (E) When a component is 0.1 mass part or more, it becomes easier to maintain photocurability. Furthermore, when the component (E) is more than 0.1 parts by mass, the photocurability can be maintained even better. On the other hand, when the component (E) is 10 parts by mass or less, it becomes easy to suppress thickening during storage, and better storage stability can be maintained. Furthermore, the effect which suppresses the thickening at the time of a storage increases that it is less than 10 mass parts, and storage stability can further be improved. Furthermore, from the viewpoint of achieving both photocurability and storage stability, the component (E) is preferably 1 to 5 parts by mass with respect to 100 parts by mass of the component (A). In addition, when several types of compounds are included as (E) component, content of (E) component shall point out these total amounts.

<(F) component: (meth) acrylic (co) polymer liquid at 25 ° C.>
Furthermore, the photocurable composition according to the present invention preferably further contains a (meth) acrylic (co) polymer that is liquid at 25 ° C. as the component (F).

(F) Component (meth) acrylic polymer refers to a (co) polymer having as a repeating unit a structural unit derived from a monomer having a (meth) acrylic group. Therefore, the component (F) is different from the component (A), more specifically, the (meth) acrylate oligomer as the component (A) in terms of the constitution of the repeating unit.

The (meth) acrylic (co) polymer may or may not contain a polar functional group or reactive functional group, and examples of the functional group having polarity include a hydroxyl group and a carboxyl group. Examples of the functional group include (meth) acrylic groups (in this case, excluded from the component (A)), hydrolyzable silyl groups such as epoxy groups and alkoxysilyl groups, but are not limited thereto. Absent. Among these, the polar functional group is preferably a hydrolyzable silyl group such as a hydroxyl group, an epoxy group, or an alkoxysilyl group.

The releasability is further improved by adding the (meth) acrylic (co) polymer as the component (F). The viscosity of component (F) at 25 ° C. is preferably from 100 to 15000 mPa · s, more preferably from 100 to 10000 mPa · s, even more preferably from 100 to 5000 mPa · s. If it is 100 mPa · s or more, it is difficult to bleed out from the cured product, and 15000 mPa · s or less, more preferably 10,000 mPa · s or less, and even more preferably 5000 mPa · s, compatibility with other components is good. .

The monomer component constituting the (meth) acrylic (co) polymer is not particularly limited as long as it has a (meth) acrylic group, and examples thereof include acrylic acid, methacrylic acid and esters thereof.

Specific examples of commercially available (meth) acrylic (co) polymers include Alfon Series UP-1000, UP-1020, UP-1021, UP-1061, UP-1110, UP-1170, Toagosei Co., Ltd. Examples thereof include UH-2000, UG-4010, US-6120, but are not limited thereto. Moreover, these may be used independently or may be used in mixture of 2 or more types.

The component (F) is preferably contained in an amount of 0.1 to 20 parts by mass with respect to 100 parts by mass of the component (A). When the component (F) is 0.1 part by mass or more, the peelability is improved, and when it is more than 0.1 part by mass, the peelability is further improved. On the other hand, if it is 20 parts by mass or less, the compatibility of the composition is easily maintained, bleed out is easily suppressed, and if it is less than 20 parts by mass, the compatibility of the composition is further easily maintained. Bleed out suppression effect is further improved. Furthermore, from the viewpoint of achieving both improvement in peelability and improvement in bleed-out suppression effect, the component (F) is more preferably 1 to 15 parts by mass with respect to 100 parts by mass of the component (A). Preferably, the amount is 3 to 12 parts by mass. In addition, when multiple types of (meth) acrylic (co) polymer is included as (F) component, content of (F) component shall point out these total amounts.

<Spacer (filler)>
Furthermore, it is preferable that the photocurable composition according to the present invention further includes a spacer. A filler can be added as the spacer. Particularly preferably, the spacer is a spherical resin bead. When a plate-shaped adherend is bonded and temporarily fixed, a substantially parallel resin layer is formed by adding spherical resin beads as a spacer to the temporary fixing agent. Specific examples of the raw material include (meth) acrylic resin and urethane resin resin beads, but are not limited thereto. The spacer preferably has a sharp particle size distribution, and the average particle size is preferably 1 to 100 μm. Particularly preferred is 10 to 70 μm. When it is 1 μm or more, more preferably 10 μm or more, more preferably more than 10 μm, it is easy to peel off during the peeling operation, and 100 μm or less, more preferably 70 μm or less, and even more preferably less than 70 μm, The thickness is stable.

Specific examples of the spacer made of (meth) acrylic resin include Art Pearl (registered trademark) SE-050T manufactured by Negami Kogyo Co., Ltd. and Ganz Pearl GM-4003 manufactured by Ganz Kasei Co., Ltd., but are not limited thereto. It is not something. Moreover, these may be used independently or may be used in mixture of 2 or more types.

It is preferable that the spacer is contained in an amount of 0.01 to 10 parts by mass with respect to 100 parts by mass of the component (A). By setting it as 0.01 mass part or more, adherends can be bonded together in parallel. On the other hand, by setting it as 10 mass parts or less, it does not prevent that the medium (hot water etc.) for peeling enters a hardened | cured material. From the above viewpoint, the spacer is more preferably contained in an amount of 0.1 to 5 parts by mass, and still more preferably 0.5 to 3 parts by mass with respect to 100 parts by mass of the component (A). When a plurality of types of fillers are included as a spacer, the spacer content indicates the total amount of these.

<Other fillers>
In the present invention, pigments, dyes and other colorants, metal powders, calcium carbonate, talc, silica, alumina, aluminum hydroxide and other inorganic fillers, flame retardants, organic fillers, and the like within a range that does not impair the characteristics of the present invention. An appropriate amount of additives such as a plasticizer, an antioxidant, an antifoaming agent, a coupling agent, a leveling agent, and a rheology control agent may be blended. These may be used alone or in admixture of two or more. By these additions, a composition excellent in resin strength, adhesive strength, workability, preservability and the like and a cured product thereof can be obtained.

The content of the other fillers (fillers other than spacers) is appropriately determined depending on the intended effect. For example, 0.1 to 10 parts per 100 parts by mass of component (A). It is preferably contained in an amount of 1 part by mass, more preferably 1 to 5 parts by mass. In addition, when several types of fillers are included as other fillers, content of other fillers shall point out these total amounts.

≪Temporary fixative≫
As another embodiment, the present invention also provides a temporary fixing agent containing the photocurable composition. Since the temporary fixing agent according to the present invention contains the above-described photocurable composition, when temporarily fixing a large-area plate-shaped adherend by adhesion, even if it is used with a narrow clearance, light irradiation is performed. It is suitable for temporary fixing by the above, and can be easily peeled off after performing the processing work of the adherend.

≪Temporary fixing method for adherends≫
The photocurable composition (and temporary fixing agent) of the present invention can be cured by light irradiation and can adhere an adherend with an appropriate strength. Specifically, after the photocurable composition (or temporary fixing agent) of the present invention is applied on an adherend, an object (an other adherend) that fixes the adherend (one adherend) is fixed. The photocurable composition (or temporary fixing agent) is cured by placing and pressing on the body) and irradiating with light. Then, the adherend is temporarily fixed to the fixed object by the cured product.

The pressure when pressing the adherend is not particularly limited, and is appropriately determined according to the material of the adherend. Also, the light irradiation conditions are not particularly limited. For example, the irradiation energy amount (integrated light amount) of ultraviolet light can be set to 10 to 10,000 mJ / cm ² . Furthermore, the irradiation energy amount of ultraviolet light (integrated quantity of light) is more preferably 100 ~ 5000mJ / cm ^2, more preferably a 1000 ~ 4000mJ / cm ^2.

The cured product of the photocurable composition of the present invention has peelability in the medium. As the peeling medium, it is preferable to use a medium of 90 ° C. or higher. Therefore, as still another embodiment of the present invention, the cured product obtained by curing the photocurable composition or the temporary fixing agent is immersed in a medium at 90 ° C. or more to peel the cured product from the adherend. There is also provided a method of temporarily fixing an adherend including

Examples of the medium at 90 ° C. or higher include hot water at 90 to 100 ° C. or medium at 90 to 200 ° C. (other than hot water). As the medium at 90 to 200 ° C. (other than hot water), it is preferable to use a medium at 100 ° C. or higher. As the medium at 100 to 200 ° C., a mixture of water and a water-soluble organic solvent having a boiling point of 100 ° C. or higher is used. be able to.

As the water-soluble organic solvent, ethylene glycol, propylene glycol or the like can be used alone or in combination, and can be arbitrarily mixed as long as a specific temperature can be set.

In order to perform temporary fixing of the adherend with sufficient strength and to peel the cured product without remaining on the adherend, in a medium of 90 ° C. or higher, more preferably in a medium of 90 to 200 ° C. It is preferable to peel off with. In particular, the photocurable composition or temporary fixing agent of the present invention that can be peeled off in a medium at 100 ° C. to 200 ° C. is excellent in the ability to temporarily fix the adherend and is subjected to stress applied from the outside during processing operations. Also, temporary fixing can be performed without peeling.

According to the temporary fixing method of the adherend according to the present invention, even when the plate-shaped adherend having a relatively large area is temporarily fixed with a narrow clearance (interval between adherends), It can be bonded with an appropriate strength and can be easily peeled off. For example, even if the area of the adherend is 2,000 mm ² or more, it can be bonded with sufficient strength and can be easily peeled off. Furthermore, according to the temporary fixing method of the present invention, even if the adherend has an area of 8,000 mm ² or more, and even 10,000 mm ² or more, it can be suitably used for temporary fixing.

In addition, as the clearance, for example, less than 200 μm, the separation can be easily performed even with a narrow clearance. Furthermore, according to the temporary fixing method of the present invention, even if the clearance is 150 μm or less, and even 100 μm or less, it can be easily peeled off and can be suitably used for temporary fixing.

The photocurable composition and temporary fixing agent of the present invention are suitable for applications in which an adherend is temporarily fixed and work steps such as cutting and polishing are performed. Examples of the adherend include, but are not limited to, a silicone wafer, sapphire glass, ceramic material, optical glass, crystal, and magnetic material.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to only these examples.

In order to prepare a photocurable composition, the following components were prepared. (Hereinafter, the photocurable composition is also simply referred to as a composition.)
(A) Component: Compound having (meth) acrylic group • Bifunctional polyester acrylate (Aronix (registered trademark) M-6200, manufactured by Toagosei Co., Ltd .; hereinafter may be abbreviated as “M-6200”)
Bifunctional bisphenol A type epoxy acrylate (EBECRYL (registered trademark) 3700 (M.W.500), manufactured by Daicel Ornex Co., Ltd .; hereinafter also abbreviated as “3700”)
Tricyclodecane dimethanol diacrylate (Light acrylate DCP-A (MW 302) manufactured by Kyoeisha Chemical Co., Ltd .; hereinafter, also abbreviated as “DCP-A”)
・ 2-Hydroxyethyl methacrylate (manufactured by Nippon Shokubai Co., Ltd .; may be abbreviated as “HEMA” hereinafter)
Ethyl carbitol acrylate (Biscoat # 190, manufactured by Osaka Organic Chemical Industry Co., Ltd .; hereinafter may be abbreviated as “# 190”)
(B) Component: Acrylamide compound Dimethylacrylamide (manufactured by DMAA KJ Chemical Co., Ltd .; hereinafter, may be abbreviated as “DMAA”)
(C) Ingredient: Water ・ Purified water (manufactured by Kyoei Pharmaceutical Co., Ltd.)
Component (D): Expandable capsule having an expansion start temperature of 70 to 95 ° C. Expandable capsule having an expansion start temperature of 80 to 95 ° C. (average particle size: 13 μm) (Expancel® 031-40DU Nippon Ferrite (Hereinafter, abbreviated as “031-40DU”)
(D ′) component: expandable capsule and expander other than component (D) • Expandable capsule with an expansion start temperature of 108 to 113 ° C. (average particle size: 12 μm) (Expancel® 051-40DU Nippon Ferrite Co., Ltd.) (Made by company; hereinafter sometimes abbreviated as “051-40DU”)
Expandable capsules having an expansion start temperature of 96 to 103 ° C. (average particle diameter: 13 μm) (Expancel (registered trademark) 053-40DU manufactured by Nippon Ferrite Co., Ltd.)
・ N, N'-Dinitrosopentamethylenetetramine (Cellular GX, manufactured by Eiwa Kasei Kogyo Co., Ltd .; hereinafter, also abbreviated as "Cellular GX")
・ Sodium bicarbonate (reagent)
・ Ethylene glycol (reagent)
Component (E): photopolymerization initiator (photocuring agent)
1-hydroxycyclohexyl phenyl ketone (manufactured by Suncure 84 Chemical Chemical Co., Ltd .; hereinafter also abbreviated as “Suncure”)
Component (F): (meth) acrylic polymer which is liquid at 25 ° C. (meth) acrylic polymer (Alfon (registered trademark) UP-1000 (M.P.) having no functional group with a viscosity of 1000 mPa · s / 25 ° C. W. 3,000) manufactured by Toagosei Co., Ltd .; hereinafter may be abbreviated as “UP-1000”)
(Meth) acrylic polymer having a hydroxyl group with a viscosity of 14000 mPa · s / 25 ° C. (Alfon (registered trademark) UH-2000 (MW 11,000) manufactured by Toagosei Co., Ltd .; hereinafter referred to as “UH-2000” Sometimes abbreviated)
A (meth) acrylic polymer having an epoxy group with a viscosity of 3700 mPa · s / 25 ° C. (Alfon (registered trademark) UG-4010 (MW 2,900) manufactured by Toagosei Co., Ltd .; hereinafter referred to as “UG-4010” "May be abbreviated as")
(Meth) acrylic polymer having an alkoxysilyl group having a viscosity of 2200 mPa · s / 25 ° C. (Alfon (registered trademark) US-6120 (MW 2,400) manufactured by Toagosei Co., Ltd .; 6120 ")
(Filler (spacer))
Acrylic beads (average particle size: 45 μm) (Art Pearl (registered trademark) SE-050T manufactured by Negami Kogyo Co., Ltd .; hereinafter, also abbreviated as “SE-050T”)
Acrylic beads (average particle size: 40 μm) (Ganz Pearl GM-4003 manufactured by Ganz Kasei Co., Ltd .; hereinafter sometimes abbreviated as “GM-4003”)
(Other fillers)
-Dimethyldichlorosilane-modified amorphous silica (average particle diameter: 16 nm) (Aerosil (registered trademark) R972, manufactured by Nippon Aerosil Co., Ltd .; hereinafter may be abbreviated as "R972")
[Examples 1 to 4, Comparative Examples 1 to 4]
Components (A) to (C) and a filler were weighed in a stirring vessel, and then stirred for 30 minutes while degassing under vacuum. Thereafter, the component (D) or the component (D ′) was weighed and added to the stirring vessel, and further stirred for 15 minutes while degassing under vacuum. Thereafter, the component (E) was weighed and added to the stirring vessel, and stirred for 15 minutes while degassing under vacuum. Detailed preparation amounts (addition amounts) were in accordance with Table 1, and all values in the table were expressed in parts by mass.

For the compositions of Examples 1 to 4 and Comparative Examples 1 to 4, peelability confirmation (initial), cured product state confirmation after peeling and peelability confirmation (after storage) were performed. The results are summarized in Table 2.

[Peelability confirmation (initial)]
The composition was coated on a glass plate having a length of 100 mm, a width of 100 mm, and a thickness of 0.7 mm. The other glass plate of the same shape was bonded together, and pressure was applied until the composition became uniform on the glass surface. Thereafter, the composition was cured by UV irradiation at 3000 mJ / cm ² to prepare a test piece. The thickness of the cured test piece was 60 μm. The test piece was immersed in hot water at 100 ° C., and the time when the cured product was peeled from the glass plate was defined as “peelability (unit: minute)”. In the table, “NG” is described when no peeling occurs in 60 minutes, and “−” is described without performing other tests and measurements. “Peelability” is preferably within 60 minutes, more preferably within 30 minutes.

[Confirmation of cured product state after peeling]
The state of the cured product peeled from the glass plate in the peelability confirmation (initial stage) was visually confirmed, and judged according to the following evaluation criteria to be a “cured product state after peeling”. When the peeled cured product is insoluble and expands, the work is bulky and troubles are generated. Therefore, it is preferable that the cured product is insoluble and does not expand and is peeled as it is.

<Evaluation criteria>
○: The cured product was insoluble and peeled without expansion. ×: The cured product was insoluble and expanded and separated.

[Peelability check (after storage)]
The composition was allowed to stand in an atmosphere at 25 ° C. for 30 days, and then the above peelability confirmation test was performed again and evaluated as “peelability (after storage)” according to the following evaluation criteria. Since it does not change in peelability even when left in an atmosphere at 25 ° C., “◯” is preferable.

<Evaluation criteria>
○: Peeled within 60 minutes ×: Does not peel within 60 minutes.

For the compositions of Examples 1 to 4, expandable capsules having an expansion start temperature of 80 to 95 ° C. are used. On the other hand, in Comparative Examples 1 and 2 using an expandable capsule that expands at 96 ° C. or higher, peeling was not possible. In addition, as expansion agents, expansion agents that decompose by heating to generate gas are known, but in Comparative Examples 3 and 4 using such expansion agents, when the composition is stored in an atmosphere at 25 ° C, it is gradually increased. It was found that the expansion agent decomposed and gas was generated, and the peelability disappeared after 30 days.

[Examples 5 to 13, Comparative Examples 5 to 10]
Components (A) to (C), (F) and a filler were weighed and added to a stirring vessel, and then stirred for 30 minutes while degassing under vacuum. Thereafter, component (D) was weighed and added to the stirring vessel, and stirred for 15 minutes while degassing under vacuum. Thereafter, the component (E) was weighed and added to the stirring vessel, and stirred for 15 minutes while degassing under vacuum. Detailed preparation amounts (addition amounts) were in accordance with Table 3, and all numerical values were expressed in parts by mass.

For the compositions of Examples 5 to 13 and Comparative Examples 5 to 10, appearance confirmation, peelability confirmation (initial), cured product state confirmation after peeling, and tensile shear bond strength measurement were performed. The results are summarized in Table 4.

[Appearance check]
The state after preparation of the composition was visually confirmed and evaluated according to the following evaluation criteria to give an “appearance”. From the viewpoint of photocurability, “transparent” is preferable.

<Evaluation criteria>
Transparent: Uniform and transparent state Opaque: Although uniform, it was cloudy.

[Peelability confirmation (initial)]
Evaluation was performed in the same manner as in [Confirmation of peelability (initial)] for the compositions of Examples 1 to 4 and Comparative Examples 1 to 4.

[Confirmation of cured product state after peeling]
Evaluation was performed in the same manner as in [Confirmation of cured product state after peeling] for the compositions of Examples 1 to 4 and Comparative Examples 1 to 4.

[Measurement of tensile shear bond strength]
As the tensile shear adhesive strength, glass plates having a thickness of 5 mm, a width of 25 mm, and a length of 100 mm were attached to each other as adherends, and bonded to each other with a bonding surface of 25 mm × 5 mm, and fixed with a jig. A test piece was produced by irradiating ultraviolet rays with an integrated light quantity of 3000 mJ / cm ² . Measurement was performed by pulling in a shearing direction at a speed of 200 mm / min with a tensile tester. “Maximum strength (N)” was measured and calculated from the adhesion area to be “adhesion strength (unit: MPa)”. When the glass plate peels off when the test piece is handled before measurement, “NG” is described. In order to prevent the adherend from falling off during the processing operation, the adhesive strength is preferably 1 MPa or more, and more preferably 4 MPa or more.

The compositions of Examples 5 to 8 have good peelability and also exhibit adhesive strength, and both fixing to the adherend and ease of peeling work are compatible. On the other hand, in Comparative Example 9 in which component (C) is not added, the peelability cannot be exhibited, and in Comparative Example 10 in which component (B) is not added, the composition is opaque and component (C) is component (A). It was not compatible and adhesive strength was not expressed. For the compositions of Comparative Examples 6 and 7 that do not contain both the component (B) and the component (C), the comparative example 6 with a small amount of the component (D) does not exhibit a releasability and has a large amount of the component (D). In Example 7, the peelability is 30 minutes or more, and the peeling work takes time. In Comparative Example 5, the solvent was added instead of the component (D), but the adhesive strength was not expressed. Furthermore, in Comparative Example 8 in which the amount of component (D) added was too large, the cured product after peeling swelled in hot water, causing trouble in the peeling work. Further, in Examples 9 to 13, which were compositions obtained by further adding the component (F) to Examples 5 to 8, the peelability could be further improved without reducing the adhesive strength.

The photocurable composition of the present invention is 90 ° C. or more (preferably 90 to 200 ° C.) even if the clearance of the adherend is narrow even though the adherend is surface-bonded with a relatively large area. It can be easily peeled in the medium. The adherend can be used for various materials such as a silicone wafer, sapphire glass, ceramic material, optical glass, crystal, and magnetic material, and can be used universally in a temporary fixing process.

This application is based on Japanese Patent Application No. 2014-173482 filed on August 28, 2014, the disclosure of which is referenced and incorporated as a whole.

Claims

A photocurable composition comprising the following components (A) to (E), comprising 100 parts by mass of the following component (A) and the following component (D) in a proportion of more than 0 to 30 parts by mass:
(A) component: a compound having a (meth) acryl group;
(B) component: acrylamide compound;
(C) component: water;
(D) component: an expandable capsule having a temperature at which expansion starts to 70 to 95 ° C .; and (E) component: a photopolymerization initiator.
The photocurable composition according to claim 1, wherein the component (D) is an expandable capsule that encloses a liquid hydrocarbon compound at 25 ° C.
The said (B) component and the said (C) component are included in the ratio of more than 0 mass part and 20 mass parts or less in total with respect to 100 mass parts of said (A) component. Photocurable composition.
The photocurable composition according to any one of claims 1 to 3, further comprising a (meth) acrylic (co) polymer that is liquid at 25 ° C as the component (F).
The photocurable composition according to claim 4, comprising the component (F) in a proportion of more than 0 part by mass and 20 parts by mass or less with respect to 100 parts by mass of the component (A).
The photocurable composition according to any one of claims 1 to 5, wherein the component (A) contains a compound having a hydroxyl group and a (meth) acryl group.
The photocurable composition according to any one of claims 1 to 6, further comprising a spacer.
A temporary fixing agent comprising the photocurable composition according to any one of claims 1 to 7.
The cured product obtained by curing the photocurable composition according to any one of claims 1 to 7 or the temporary fixing agent according to claim 8 is immersed in a medium at 90 ° C or more to deposit the cured product. A method for temporarily fixing an adherend, including peeling from a body.