Process for the production of high viscosity polyamide by adding

Details Process for the production of high viscosity polyamide by adding Process for the production of high viscosity polyamide by adding

1977-01-10

1978-07-18

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528333, 526 1, C08G 6948

Patent

active

041015320

ABSTRACT:
Polyamide compositions having a high viscosity in the molten state are prced by preparing a polyamide, adding to the polyamide while the same is in the molten state, an alkylene carbonate in an amount from 0.1 to 2% by weight, and preferably from 0.4 to 0.9% by weight of the polyamide, and extruding the resulting composition. The alkylene carbonate containing polyamide composition may be dried under reduced pressures at temperatures comprised between 110.degree. and 210.degree. C. The preferred polyamide is polyamide-6 (polycapronamide) and the preferred alkylene carbonates are propylene and ethylene carbonates. The resulting compositions can be made into chips suitable for processing by known extrusion and molding techniques.

REFERENCES:
patent: 2835653 (1958-05-01), Haas et al.
patent: 3378532 (1968-04-01), Fritz et al.
patent: 3476711 (1969-11-01), Muller et al.
patent: 3496149 (1970-02-01), Tsunawaki et al.

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