Foaming method
US5898039A · kind A · utility
1Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1997 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | May 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249987
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for forming a foamed article having a closed cell structure without the need to use a halogenated blowing agent. In the process, a polymer blend comprising at least 50% by weight of a styrenic polymer and up to 50% by weight of an acrylic polymer which has an average molecular weight which is less than 90% of that of the styrenic polymer and a hydrocarbon blowing agent are supplied to a heated extruder where the blend is formed and the blowing agent incorporated to form a molten mixture from which the foamed article is formed on release from the extruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.