Preparation of amorphous polyamides based on aromatic dicarboxyl

Details Preparation of amorphous polyamides based on aromatic dicarboxyl Preparation of amorphous polyamides based on aromatic dicarboxyl

1989-10-13

1990-10-16

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

525432, 528335, 528336, 528339, 528349, C08G 6928

Patent

active

049636464

ABSTRACT:
Amorphous (co)polyamides are polycondensed from aromatic dicarboxylic acid(s), e.g., isophthalic acid and/or terephthalic acid, and from aliphatic diamine(s), e.g., hexamethylenediamine, by preparing two unbalanced prepolymers of low viscosity, one containing excess COOH endgroups and the other containing excess NH.sub.2 endgroups, and then, in a second stage, the two unbalanced prepolymers are mixed in given proportions and their postcondensation is carried out in the molten state in a vented extruder including one or more screws; the amorphous (co)polyamides thus prepared are perfectly transparent and can be easily injection molded into useful shaped articles endowed with good properties, especially in respect of multiaxial impact.

REFERENCES:
patent: 4245066 (1981-01-01), Nakagawa et al.

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