发明名称 |
PROCESS FOR PRODUCING A POLYAMIDE BASED ON A DICARBOXYLIC ACID AND A DIAMINE |
摘要 |
<p>A polymer based on a dicarboxylic acid and a diamine is prepared by polycondensation in an extruder, by(a) heating a mixture of a dicarboxylic acid having from 4 to 12 carbon atoms and a diamine having from 4 to 12 carbon atoms, which mixture is solid at room temperature and has a residual moisture content of less than 5% by weight, to a temperature in the range from 150 to 400° C. under autogenous pressure in a contrarotating twin-screw extruder to give a product A,(b) feeding the product A to a corotating twin-screw extruder, with the product A being exposed to a temperature in the range from 150 to 400° C. and residual water present and also water from the polycondensation being removed through the degassing openings, to give a product B, with the proviso that the corotating twin-screw extruder has at least two segments having different pressures.</p> |
申请公布号 |
EP0821708(B1) |
申请公布日期 |
1998.12.09 |
申请号 |
EP19960909142 |
申请日期 |
1996.03.28 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
GOETZ, WALTER;HOFMANN, JUERGEN;KOPIETZ, MICHAEL;HORLE, HELMUT |
分类号 |
C08G69/26;C08G69/04;C08G69/28;C08G73/10;G03F7/004;G03F7/038;G11B5/48;G11B21/00;H05K1/05;(IPC1-7):C08G69/28 |
主分类号 |
C08G69/26 |
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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