发明名称 |
Verfahren zur Herstellung von Polycarbonaten |
摘要 |
Polycarbonates having good crystallizability and containing ester linkages are made by polycondensing a mixture of (a) bisphenol A or an alkali metal salt thereof, (b) a bischloroformate of bisphenol A and (c) a bischloroformate or bisbromoformate of a bis(hydroxyalkyl) ester of a dicarboxylic acid; the mixture containing not more than 10 mol per cent of (c) based on the sum of (b) and (c). Polycondensation is preferably effected by an interfacial process using an onium compound as catalyst. The polycarbonates may be made into films or fibres which may be crystallized by heating them to a temperature between 10 DEG C. above the glass transition temperature and 10 DEG C. below the crystalline melting point. In examples, ingredient (c) was the bischloroformate of (2)-(13) bis(b -hydroxyethyl) terephthalate; (14)-(18) bis(d -hydroxybutyl) terephthalate; (19) bis(b -hydroxyethyl) isophthalate; (20) the bis(b -hydroxyethyl) ester of pyridine-2,5-dicarboxylic acid; (21) bis(b -hydroxyethyl) adipate. |
申请公布号 |
DE1520033(A1) |
申请公布日期 |
1969.11.13 |
申请号 |
DE1964G042454 |
申请日期 |
1964.12.31 |
申请人 |
GEVAERT PHOTO-PRODUCTEN N.V. |
发明人 |
JAN CONIX,ANDRE;GASTON JEURISSEN,LAMBERT |
分类号 |
B01D39/14;C08G63/64;C08G64/18;C08G64/26;D01F6/64 |
主分类号 |
B01D39/14 |
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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