发明名称 |
Polycarbonate production. |
摘要 |
<p>This invention relates to polycarbonate prepolymers which are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to form fine dispersions of partially phosgenated phenols, allowing for interfacial reactions to occur in residence sections and repeating the steps after the addition of caustic to form high molecular weight prepolymers. These prepolymers are then polymerized with amines to form high molecular weight polycarbonates.</p> |
申请公布号 |
EP0304691(A2) |
申请公布日期 |
1989.03.01 |
申请号 |
EP19880112618 |
申请日期 |
1988.08.03 |
申请人 |
THE DOW CHEMICAL COMPANY |
发明人 |
WESTON, JOHN W.;SMITH II, RONALD R.;AGUILAR, JOSE LOUIS |
分类号 |
C08G64/20;C08G64/22;C08G64/24 |
主分类号 |
C08G64/20 |
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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