Preparation of dry polycaprolactam granules

Details Preparation of dry polycaprolactam granules Preparation of dry polycaprolactam granules

1984-10-19

1987-02-10

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Utilizing special inert gaseous atmosphere or flushing mold...

264143, 264178F, 264235, 26433119, 264346, B29C 4788

Patent

active

046422110

ABSTRACT:
Dry polycaprolactam granules containing from 8 to 13% by weight of caprolactam and its oligomers are prepared by a method in which a caprolactam melt is extruded, the extrudates are cooled to 100.degree.-150.degree. C., left at this temperature until the polycaprolactam has substantially crystallized, and then immediately granulated, and the granules are left in a stream of inert gas, in the absence of molecular oxygen, for from 1 to 4 hours at from 100.degree. to 150.degree. C., and are then cooled.

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patent: 3753661 (1973-08-01), Simons
patent: 4508675 (1985-04-01), Salatiello et al.

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