发明名称 |
Process for the preparation of high-viscosity polyhexamethyleneadipamide |
摘要 |
The invention relates to a process for the preparation of high-viscosity polyhexamethyleneadipamide by post-polycondensation of the melt of a polymer having a relative viscosity of 2.5-2.7 (measured in 1% solution in 96% sulphuric acid) in a twin-screw extruder having co-rotating, mutually engaging screws and vent (degassing) zones, where the polymer melt is polycondensed by treatment in a plurality of successively arranged zones of alternating increased and reduced pressure in the extruder, where steam superheated to the temperature of the melt is fed to the melt in the zones of increased pressure in an amount of 0.05-0.7 kg/kg of polymer, the vapour (steam) phase which has been fed in and the water of condensation are removed in the zones of reduced pressure, and the temperature of the melt is increased uniformly over the length of the extruder from 260-280 DEG C in the first zone to 280-310 DEG C in the final zone.
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申请公布号 |
DE3605202(A1) |
申请公布日期 |
1987.02.12 |
申请号 |
DE19863605202 |
申请日期 |
1986.02.19 |
申请人 |
WERNER & PFLEIDERER;NAUCNO-PROIZVODSTVENNOE OB>>EDINENIE <<PLASTMASSY>>RESEARCH INSTITUTE OF PLASTICS |
发明人 |
SDISLAWOWNA BOKARJOVA,ESWINA;NURGALIJEVIC NURMUCAMEDOV,SIJAR;ISAKOVIC FEIDEL,GARRI;ALEKSEEVNA NOSSOVA,LARISSA;ALEKSANDROVNA DUKOR,ALLA |
分类号 |
C08G69/04;C08G69/28;C08G69/48;(IPC1-7):C08G69/48 |
主分类号 |
C08G69/04 |
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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