Radical-curable sealing member for fuel cells

Abstract

Provided is a radical-curable sealing member for fuel cells that has excellent product durability and suppresses changes in mechanical properties caused by heat and hydrolysis (such as reduced stretch and increased hardness caused by embrittlement). A sealing member 4 is a crosslinked product of a radical-curable composition that contains components (A)-(E), there being 0.1-10 parts by mass of component (B) per 100 parts by mass of component (A). (A) A polymer for fuel cell sealing members that has a radical-curable functional group and also has at least one of a urethane linkage and an ester linkage in the molecular chain thereof. (B) A carbodiimide compound that has at least one functional group selected from the group that consists of ether groups, aliphatic hydrocarbon groups that have at least 3 carbons, and alicyclic hydrocarbon groups. (C) A monofunctional (meth)acrylic monomer. (D) A polyfunctional (meth)acrylic monomer. (E) A radical polymerization initiator.

Dependencies are inferred from the claim text.