发明名称 |
Aromatic polyphosphonates and a process for their production |
摘要 |
Thermoplastic, branched aromatic polyphosphonates with average molecular weights (number average Mn) of from 11,000 to more than 200,000, obtainable by transesterifying (a) from 97 to 100 moles of at least one diaryl phosphonate, and (b) from 0 to 3 moles of at least one triaryl phosphate-the sum of the moled of (a) and (b) being 100-with (c) from 90 to 99 moles of at least one aromatic dihydroxy compound, and (d) from 0 to 3 moles of at least one aromatic trihydroxy or tetrahydroxy compound-with the proviso that at least one of the components (b) and (d) is present in a quantity of at least 0.001 mole and that, where (b) and (d) are used, the maximum limit on the moles is 3.0.
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申请公布号 |
US4331614(A) |
申请公布日期 |
1982.05.25 |
申请号 |
US19800160646 |
申请日期 |
1980.06.18 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
SCHMIDT, MANFRED;BOTTENBRUCH, LUDWIG;FREITAG, DIETER;REINKING, KLAUS;ROEHR, HARRY;BLOCK, HANS-DIETER |
分类号 |
C08G79/00;C08G79/02;C08G79/04;(IPC1-7):C07F9/40 |
主分类号 |
C08G79/00 |
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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