| 摘要 |
PCT No. PCT/JP80/00163 Sec. 371 Date Mar. 11, 1981 Sec. 102(e) Date Mar. 11, 1981 PCT Filed Jul. 18, 1980 PCT Pub. No. WO81/00258 PCT Pub. Date Feb. 5, 1981.An unsaturated polyester was obtained by reacting a polyhydric alcohol with a mixture of an unsaturated polybasic acid and a specific saturated dibasic acid represented by the formula: <IMAGE> or the formula: <IMAGE> wherein, R1 to R10 are each hydrogen or alkyl, R' to R'''' are the same or different and each represent hydrogen or ester-exchangeable alkyl, m is 1 or 2, and n is zero or 1. The compositions comprising this polyester and an aromatic vinyl monomer, when hardened in the presence of a catalyst, exhibit a lower shrinkage during the hardening and give molded products with improved resistance to alkalis and to boiling water.
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