Continuous process for preparing particulate microporous, open-celled polymer structures in a screw-type extruder
US4041115A · kind A · utility
19Cited by
7References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 1975 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | May 12, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/13
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.