Closed cell polymer foam
US6384095B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A closed-cell polymer foam having a density of less than 100 kg.m−3 is described. The cells in the foam contain a foam blowing agent comprising (a) a blend of two or more hydrofluorocarbons, (b) a blend comprising a carbon dioxide and one or more hydrofluorocarbons or (c) a blend comprising dimethyl ether and one or more hydrofluorocarbons, and the polymer is a blend comprising at least 50% by weight of an olefinic polymer(s) and up to 50% by weight of a polar polymer(s) having a lower molecular weight than the olefinic polymer which when in the heat plasticised state is able to dissolve the foam blowing agent. A process for preparing the foam is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.