发明名称 |
PROCESS FOR POLYMERIZATION OF POLYESTER OLIGOMERS |
摘要 |
This invention is directed to an improved process for producing a polyester oligomer. The process employs a pipeline reactor, having at least two stages, in which the degree of polymerization of an oligomeric feed material is raised from about 2-10 to about 2-40 and the ratio of carboxyl to hydroxyl end groups in the product is reduced. In a first stage of the process, a monomeric diol or polyol, such as ethylene glycol, is added to a melt of the oligomeric feed material. In a second stage of the process, the molecular weight of the oligomer is increased by removal of volatile reaction by-products, including water and polyol. The oligomer produced by the present invention may be used in making higher molecular weight polyesters.
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申请公布号 |
WO9622318(A1) |
申请公布日期 |
1996.07.25 |
申请号 |
WO1996US00327 |
申请日期 |
1996.01.11 |
申请人 |
E.I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
IWASYK, JOHN, MAURICE;RAKESTRAW, JULIE, ANDERSON;LEFFEW, KENNETH, WAYNE |
分类号 |
B01J3/04;B01J19/24;C07C67/03;C08G63/78;(IPC1-7):C08G63/78 |
主分类号 |
B01J3/04 |
代理机构 |
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主权项 |
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地址 |
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