| 摘要 |
PURPOSE:To obtain the title material having a high flash point, a low molding shrinkage and improved dimensional stability by mixing a specified unsaturated polyester with a saturated polyester resin and additives. CONSTITUTION:An acid component comprising an alpha,beta-unsaturated dibasic acid and optionally an aromatic or aliphatic saturated dibasic acid is polycondensed with a glycol by heating to obtain an unsaturated polyester (a). Component (a) is dissolved in a vinyltoluene derivative as a comonomer (b) to obtain an unsaturated polyester (A) containing 30-55wt.% component (b) as a comonomer. 10-30wt.% component A is mixed with 1-6wt.% saturated polyester resin (B) of an average mol.wt. of 15000-30000 and additives (C) such as a cure initiator, a mold release, a filler, a reinforcement and a colorant. |
