Process for producing polystyrene foam
US5218006A · kind A · utility
13Cited by
7References
2Claims
0Family size
Inventors
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process to produce polystyrene foam comprising mixing a predetermined amount of masterbatch mix and a styrenic polymer, heating this mixture, injecting CO.sub.2 and/or nitrogen, in gas or liquid form, as a blowing agent and subsequently extruding, cooling and drying the resulting polystyrene foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.