Patent ID: 6808821
Filing Date: 2004-10-26
Classification: C08F,C08G,C08L,C09D,Y10T

Abstract:
An unsaturated polyester resin composition comprising an unsaturated polyester (A) and a polymerizable unsaturated monomer (B),the unsaturated polyester (A) derived from a dibasic acid component and a polyhydric alcohol component, wherein the dibasic acid component comprises 30 to 65 mol % of an alicyclic saturated dibasic acid and 35 to 70 mol % of an aliphatic unsaturated dibasic acid, and the polyhydric alcohol component comprises 40 to 80 mol % of a symmetric glycol and 20 to 60 mol % of an asymmetric glycol having a side chain, or the dibasic acid component comprises 30 to 65 mol % of an alicyclic saturated dibasic acid and 35 to 70 mol % of an aliphatic unsaturated dibasic acid, and the polyhydric alcohol component comprises 60 to 80 mol % of a symmetric glycol, 10 to 35 mol % of a glycol having no side chain, and 5 to 10 mol % of an asymmetric glycol having a side chain, and wherein the â€œshrinkage stress upon coolingâ€  of cured article thereof is 17 Mpa or less and a ratio of the â€œshrinkage stress upon cooling/elastic limitâ€  is 1 or less.