PURPOSE: The titled composition with excellent adhesion to the surface of a metal, which is prepared by compounding a specified prepolymer compounded with a urethane (meth)-acrylate, a monomer having an ethylenically unsaturated group, and a photopolymerization initiator.
CONSTITUTION: A prepolymer component is prepared by compounding a urethane (meth)acrylate of MW about 1,000W50,000, of the formula [wherein A is a residue of an organic diisocyanate, from which the two isocyanate groups have been removed; B is a residue of a diol from which the two hydroxyl groups have been removed; R is a residue of a hydroxy group-containing ester of (meth)acrylic acid from which the hydroxy group has been removed; n is 1 or more], with a prepoly mer (e.g., a bisphenol-type epoxy compound of MW about 500W2,000) having ethylenically unsaturated groups at the both terminals. Then said prepolymer component, a monomer having an ethylenically unsaturated group (e.g., 2-hydroxyethyl acrylate), and (C) a photopolymerization initiator (e.g., anthraquinone) are compounded.
SATOU JIROU
FUJITA YUKIO
IBATA JIYOUJI
