Polyamide powder formed by particles having a gypsum rose struct

Details Polyamide powder formed by particles having a gypsum rose struct Polyamide powder formed by particles having a gypsum rose struct

1988-07-11

1989-05-16

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 64, 521183, 521189, 528315, C08J 928

Patent

active

048310611

ABSTRACT:
A polyamide powder consisting essentially of elementary porous particles having a "gypsum rose" structure and a process for preparing a polyamide powder comprising polymerizing by anionic polymerization lactam in a solvent medium in the presence of a catalyst, an activator, and at least one amide; one of which is N,N'-alkylene bisamide; said polymerization being initiated with said lactam and said amide used in an amount such that the solvent is in the supersaturated state at the polymerization initiation temperature.

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patent: 4716215 (1987-12-01), Matsui et al.
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