Purification, impregnation and foaming of polymer particles with carbon dioxide
US5049328A · kind A · utility
69Cited by
9References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jul 2, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/09
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for making high-purity foam moldings without the use of organic blowing agents involves the use of inorganic gases such as carbon dioxide, nitrogen, air and other pneumatogens. The process involves the simultaneous impregnation and purification of the polymers with or without foaming. If foaming is not done in the extractor, the polymeric particles can be foamed in pre-expanders or expanded and molded in downstream equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.