Process for the preparation of polytetramethylene adipamide

Details Process for the preparation of polytetramethylene adipamide Process for the preparation of polytetramethylene adipamide

1986-09-30

1987-12-29

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

C08G 6928

Patent

active

047162147

ABSTRACT:
A process is disclosed for the preparation of polytetramethylene adipamide by heating in a first reaction zone, the salt of 1,4-diaminobutane and adipic acid, with from 0-25 wt. % of other polymide-forming compounds, at a pressure between 5 and 100 bars to form a prepolymer, then passing the prepolymer containing liquid reaction mixture to a second reaction zone wherein the temperature of the liquid reaction mixture is maintained above its solidification point while the pressure is simultaneously reduced, then subjecting the prepolymer containing liquid reaction mixture to after-condensation in at least one subsequent reaction zone.

REFERENCES:
patent: 4408036 (1983-10-01), Gaymans et al.
patent: 4446304 (1984-05-01), Gaymans et al.
patent: 4460762 (1984-07-01), Gaymans et al.

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