发明名称 |
Process for producing polyester resins |
摘要 |
In the invention, a polyester resin comprising dicarboxylic acid constitutional units and diol constitutional units wherein 5 to 60 mol % of the diol constitutional units has a cyclic acetal skeleton is produced by a process comprising an oligomerization step and a polymerization step. In the oligomerization step, an ester having a limited acid value is transesterified with a diol having a cyclic acetal skeleton in the presence of a basic compound to obtain an oligomer. The oligomer is then polymerized in the subsequent polymerization step to increase the molecular weight.
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申请公布号 |
US7183362(B2) |
申请公布日期 |
2007.02.27 |
申请号 |
US20040998058 |
申请日期 |
2004.11.29 |
申请人 |
MITSUBISHI GAS CHEMICAL COMPANY, INC. |
发明人 |
HIROKANE TAKESHI;KUWAHARA SHOJIRO;IKEDA TSUYOSHI;SAEGUSA NOBUYA;OYAMA TOMOHITO |
分类号 |
C08F20/00;C08G59/00;C08G63/66;C08G63/672;C08G63/78;C08G63/82;C08G63/85 |
主分类号 |
C08F20/00 |
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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