Francis J Jenkins

US Patent:

40411150, Aug 9, 1977

Filed:

May 12, 1975

Appl. No.:

5/576632

Inventors:

Francis Edward Jenkins - Wilmington DE
Daniel Gregory Tynan - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

B29D 2700

US Classification:

264 5

Abstract:

A continuous process for preparing particulate microporous, open-celled polymer structures in a co-rotating twin-screw processor comprising agitating normally solid organic polymer and chlorofluorocarbon in the melt zone of said processor, cooling the resulting solution under agitation in the cooling and milling zone, extruding a snow-like mass from the cooling and milling zone, and then removing the chlorofluorocarbon from the snow-like mass to leave the polymer structures.