STYRYLOXY RESIN UNDERGOING CATIONK POLYMERIZATION, POLYMERIZABLE COMPOSITION FORMED THEREFROM, CROSSLINKED POLYMER OF SAID RESIN AND METHOD OF CURING SAID RESIN

摘要

Cationically polymerisable styryloxy resins having urethane linkages, represented by the formula III CHEM wherein R1 and R2 are H, or one of R1 and R2 is H and the other is methyl; R3 and R4 (which may be the same or different) are H, lower alkyl, or alkoxy if R2 is not methyl; R5 is a divalent hydrocarbon radical; G1 is an n-valent hydrocarbon radical free of amino, aliphatic thiol, aliphatic hydroxyl or other groups which interfere with cationic polymerisation; and n is an integer of 2 or more. G1 is a hydrocarbon backbone which is not interrupted by a hetero atom. Preferably G1 is a residue of a diene homopolymer or copolymer, in which case the resins produce flexible polymers. The resins are polymerised with a cationic polymerisation initiator or latent acid catalyst. The resins have utility in the field of electronics.