Discontinuous process for the production of a polyamide-6,6

Details Discontinuous process for the production of a polyamide-6,6 Discontinuous process for the production of a polyamide-6,6

1993-09-23

1994-04-26

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528324, C08G 6928

Patent

active

053068041

ABSTRACT:
Discontinuous process for the production of polyamide-6,6 by heating an aqueous AH-salt solution, precondensing the solution with evaporation of water at 6 to 9 bar pressure and polycondensing in the melt phase, whereby the heating rate above 175.degree. C. of the AH-salt solution is at least 1.degree. C./minute, the rate of evaporation of water is at least 2%/minute (based on the quantity of water in the AH salt solution), the retention time for heating from 175.degree. C. and precondensation is not more than 75 minutes and the total retention time including polycondensation is not more than 120 minutes.

REFERENCES:
patent: 2163636 (1939-06-01), Spanagel
patent: 3193535 (1965-07-01), Carter
patent: 3501441 (1970-03-01), Brignal
patent: 4297478 (1981-10-01), Rochina et al.

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