发明名称 |
Process for the preparation of polyester, a polyester and its use |
摘要 |
Process for making a polyester having polyethylene terephthalate units including transesterifying a terephthalic acid ester with a glycol using a manganese salt as catalyst and then subjecting the product to a polycondensation reaction using a germanium-containing catalyst to form a polyester; adding phosphorous compounds to block 80 to 99% by weight of the active manganese salt thus leaving an unblocked portion of the manganese salt prior to the polycondensation; and adding 10 to 100 ppm of Ge at the end of a ethylene glycol stage of the polymerization so that the Ge and the unblocked portion of the manganese salts provide the germanium-containing catalyst for the polycondensation reaction. The P/Mn molar ratio being less than 1. The reaction mixture contains 10 to 100 ppm of manganese during the reaction.
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申请公布号 |
US5417908(A) |
申请公布日期 |
1995.05.23 |
申请号 |
US19930167720 |
申请日期 |
1993.12.15 |
申请人 |
RHONE-POULENC VISCOSUISSE SA |
发明人 |
ENGGASSER, JOSIANE;STAHLIN, ROLAND;GESCHE, PAUL |
分类号 |
C08G63/83;C08G63/86;(IPC1-7):B29C47/00;C08G63/82 |
主分类号 |
C08G63/83 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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