发明名称 |
Cyclic polycarbonate oligomers from spirobiindane bisphenols. |
摘要 |
<p>Cyclic polycarbonate mixtures containing units derived from spirobiindane bisphenols, preferably 6,6'-dihydroxy-3,3,3',3'-tetramethylspirobiindane, are prepared from the corresponding bischloroformates or mixtures thereof with bisphenols. They may be homopolymeric or copolymeric; cyclic oligomer mixtures are preferred. Such oligomers may be converted to linear polycarbonates having high glass transition temperatures.</p> |
申请公布号 |
EP0254995(A1) |
申请公布日期 |
1988.02.03 |
申请号 |
EP19870110357 |
申请日期 |
1987.07.17 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
BRUNELLE, DANIEL JOSEPH;EVANS, THOMAS LANE;SHANNON, THOMAS GERARD |
分类号 |
C08G64/08;C08G64/00;C08G64/02;C08G64/06;C08G64/10;C08G64/16;C08G64/20;C08G64/26;C08G65/40;C08G75/28;C08J5/04 |
主分类号 |
C08G64/08 |
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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