Method and device for continuously producing copolyamides...

Details Method and device for continuously producing copolyamides... Method and device for continuously producing copolyamides...

2005-05-21

2009-11-10

Gulakowski, Randy (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C526S065000, C526S060000

Reexamination Certificate

active

07615606

ABSTRACT:
The invention relates to a method for continuously producing copolyamides with melting points greater than approximately 265° C. According to the invention, in a continuous process, partially aromatic and partially crystalline polyamides of the following chemical systems with defined molar percentages of the individual components are produced during the synthesis of polymers: 30 to 50 mol % of aromatic dicarboxylic acids, which are derived from terephthalic acid; 30 to 50 mol % of aliphatic diamines, which are derived from hexamethylenediamine or of cycloaliphatic diamines having at least 6 C atoms, and; 0.5-25 mol % of aromatic diamines or cyclic diamines with at least 6 C atoms. The sum of all polymer-forming components add up to a composition of 100 mol %, and a stoichiometric ratio between amines and carboxylic acids exists.

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