Modified liquid diene-based rubber and production process for the same

A curable resin composition comprising a modified liquid diene-based rubber (A) comprising, in a molecule, a modified group (a) comprising a (meth)acryloyl group as a part thereof and at least one modified group (b) selected from a dicarboxylic acid monoester and a dicarboxylic acid monoamide (with the proviso that the modified group (b) comprises no (meth)acryloyl group as a part thereof), the functional group equivalent weights of the modified group (a) and the modified group (b) being each in the range of 700 to 40,000 g/eq, and a radical polymerization initiator (B),

• wherein the radical polymerization initiator (B) is contained in an amount of 0.1 to 20 parts by mass based on 100 parts by mass of the total amount of the resin composition, and
• wherein the modified group (b) is at least one kind selected from the group consisting of a dicarboxylic acid monoester of formula (b1) or (b1′) and a dicarboxylic acid monoamide of formula (b2) or (b2′):
• wherein, in formulae (b1) and (b1′), R1 is an optionally substituted alkyl group that comprises no (meth)acryloyl group as a part thereof,
• wherein, in formulae (b2) and (b2′), R2 and R3 are each a hydrogen atom or an optionally substituted alkyl group that comprises no (meth)acryloyl group as a part thereof.