Catalytic, solid state process for the preparation of linear pol

Details Catalytic, solid state process for the preparation of linear pol Catalytic, solid state process for the preparation of linear pol

1991-04-08

1992-07-07

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528335, 528337, 528347, 528349, C08G 6930, C08G 6928

Patent

active

051284421

ABSTRACT:
A process for the preparation of a linear polyamide by reacting the appropriate dicarboxylic acid and diamine in a liquid reaction medium with the addition of a catalytically effective phosphorus compound, removing the reaction medium to give a solid salt, precondensing the latter in the solid phase at a temperature of from 140.degree. C. to 5.degree. C. below the melting point of the salt and continuing condensation at a temperature above that used for the precondensation until the desired degree of condensation is reached.

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