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

1988-12-27

1990-05-22

Poelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 64, 521183, 521189, 528315, C08J 928

Patent

active

049278606

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.

REFERENCES:
patent: 4831061 (1989-05-01), Hillaire et al.
Parfums Cosmetiques Aromes, No. 52, Aug.-Sep. 1983, pp. 83-85; Keraudy: "Les poudres polyamides dans les formulations cosmetiques".

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