Patent ID: 8598250

Claim:
A photocurable acrylic viscoelastic material composition comprising: an acrylic monomer mixture containing an alkyl (meth)acrylate as a main monomer component and a polar group-containing vinyl monomer, or a partial polymerization product thereof; a (meth)acrylate compound having at least one isocyanate group within the molecule thereof; and a photopolymerization initiator; wherein the amount of the alkyl (meth)acrylate in the acrylic monomer mixture or a partial polymerization product thereof is from 70 to 99 wt % based on the total amount of monomer components constituting the acrylic monomer mixture or a partial polymerization product thereof; and wherein the amount of the (meth)acrylate compound having at least one isocyanate group within the molecule thereof is 0.05 to 3 parts by weight based on 100 parts by weight of all monomer components in the acrylic monomer mixture or the partial polymerization product thereof.