Photocurable resin composition

Abstract

Provided is a photocurable resin composition having excellent adhesive properties and excellent sealing properties. The photocurable resin composition comprises components (A) to (D), wherein the component (A) includes a component (A-1) and the content of the component (A-1) is 60 mass% or higher with respect to the total mass of the component (A). Component (A): one or more vinyl polymers each having one or more (meth)acryloyl groups at a main chain end; component (A-1): a polyisobutylene resin having two or more (meth)acryloyl groups at a main chain end; component (B): a monofunctional (meth)acrylate compound having a linear or branched hydrocarbon group having less than 18 carbon atoms (provided that the component (B) is not the component (A)); component (C): a photoradical polymerization initiator; and component (D): a saturated hydrocarbon resin.

Claims

1. A photocurable resin composition comprising components (A) to (D), wherein component (A) comprises component (A-1), and the content of component (A-1) is 60% by mass or more relative to the total mass of component (A): (A) component: vinyl polymer having one or more (meth)acryloyl groups at the end of the main chain; (A-1) component: polyisobutylene resin having two or more (meth)acryloyl groups at the end of the main chain; (B) component: monofunctional (meth)acrylate compound having linear or branched hydrocarbon groups with fewer than 18 carbon atoms (excluding component (A)); (C) component: photoradical polymerization initiator; and (D) component: saturated hydrocarbon resin.

2. The photocurable resin composition according to claim 1, wherein component (D) is an alicyclic saturated hydrocarbon resin.

3. The photocurable resin composition according to claim 1 or 2, wherein the content of component (D) is 11 parts by mass or more with respect to 100 parts by mass of component (A).

4. The photocurable resin composition according to claim 1 or 2, wherein the component (A) comprises a hydrogenated polybutadiene resin having one (meth)acryloyl group at the end of the main chain as component (A-2), and the content of component (A-2) is 1 to 30% by mass relative to the total mass of component (A).

5. The photocurable resin composition according to claim 1 or 2, wherein component (B) is a monofunctional (meth)acrylate compound having a linear or branched hydrocarbon group with 9 or fewer carbon atoms.

6. The photocurable resin composition according to claim 1 or 2, wherein the softening point of component (D) is 110°C or lower.

7. The photocurable resin composition according to claim 1 or 2, further comprising silica powder as component (E).

8. A cured product obtained by curing the photocurable resin composition according to claim 1 or 2.

9. A sealant comprising the photocurable resin composition according to claim 1 or 2.

10. A fuel cell comprising any one seal selected from the group consisting of seals between adjacent separators in a fuel cell, seals between the frame and electrolyte membrane of a fuel cell, and seals between the frame and electrolyte membrane electrode assembly of a fuel cell, wherein the seal is the cured product described in claim 8.

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