MODIFIER OF UNSATURATED URETHANE RESIN FOR CURING FORMATION, UNSATURATED URETHANE RESIN COMPOSITION FOR CURING FORMATION CONTAINING THE SAME

摘要

PURPOSE: To obtain a modifier which comprises particles of crosslinked polymer prepared by polymerization of a specific unsaturated urethane resin, capable of preventing the shrinkage of unsaturated polyurethane resin when this resin is cured and molded, and improving the transparency of this cured product. ;CONSTITUTION: This modifier comprises crosslinked polymer particles which are obtained by radical polymerization of an unsaturated urethane resin prepared from (A) a compound of formula I (X¹ is a residue after removal of isocyanate groups from di- or tri-isocyanate; R¹, R³ are each H, methyl; R², R⁴ are each a 5 to 21C aliphatic hydrocarbon group; (j), (k) are 1, 2 where j+k is 2, 3), and a compound of formula II (X² is X¹; Y³ is Y¹; Y⁴ is a residue obtained by removing OHs a di- or tri-hydric polyol; R⁵, R⁷, R⁸ are R¹; R⁶ is R²; (m), (n) are each 1, 2 where m+n are 2, 3; (p), (q) are 0 to 2 where p+q is 1, 2) and (B) a (meth)acrylic ester at an A/B weight ratio of 80/20 to 20/80.;COPYRIGHT: (C)1995,JPO