Patent ID: 7408002

Claim:
A method for forming a hydrogel by subjecting a photosensitive resin composition to photopolymerization, the photosensitive resin composition comprising a poly((meth)acrylic acid)-based water-soluble photo-sensitive resin (A) having an acid value of 170 mgKOH/g or more on a solid basis; the resin (A) being formed of a ((meth)acrylic acid)-based polymer in which a compound represented by formula (1): wherein R 1 represents H or Me; and R 2 represents a linear or branched C 2 -C 10 alkylene group, has been added to portions of carboxyl groups of (meth)acrylic acid composing the ((meth)acrylic acid)-based polymer, a photopolymerization initiator (B); and water (C).