Process for preparing polyamide-based, pulverulent coating compo

Details Process for preparing polyamide-based, pulverulent coating compo Process for preparing polyamide-based, pulverulent coating compo

1986-03-18

1987-12-08

Anderson, Harold D.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524379, 524606, 528487, 528496, C08G 6946

Patent

active

047119250

ABSTRACT:
A precipitation procedure for preparing pulverulent coating compositions of high molecular weights by post condensation and based on polyamides having at least ten aliphatically bound carbon atoms per carbonamide group. The starting materials are uncontrolled polyamides having a relative solution viscosity of between 1.7 and 2.0 (measured in 0.5% meta cresol solution at 25.degree. C.) and contain not more than 0.2% by weight of phosphoric acid. After the cooling stage of the precipitation step of the polyamides, from 0.3 to 1.2% by weight of phosphoric acid referred to the polyamide are dispersed in the suspension prior to the precipitation in the solution or after the precipitation stage.

REFERENCES:
patent: 4273919 (1981-06-01), Feldmann et al.
patent: 4334056 (1982-06-01), Meyer et al.

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