| 摘要 |
PCT No. PCT/GB94/01181 Sec. 371 Date Apr. 5, 1996 Sec. 102(e) Date Apr. 5, 1996 PCT Filed Jun. 1, 1994 PCT Pub. No. WO94/28047 PCT Pub. Date Dec. 8, 1994Method of retarding age embrittlement of polyester comprising heat treating the polyester after preparation by cooling below 90 DEG C. and then heating at 90 DEG C. to 160 DEG C. within 24 hours of preparation, and a polyester composition in which ageing is substantially retarded compared to the non-heat treated polyester. The invention encompasses the polyester composition which has been subjected to the method.
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