Hydrogenated vinyl aromatic polymer foams
US6310112A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2000 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Nov 15, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2353/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention provides a thermoplastic polymer foam having a density of up to 800 kg/m.sup.3. The foam is made from a hydrogenated vinyl aromatic polymer that contains pendant cycloaliphatic groups. This polymer is conveniently made by hydrogenating a poly(vinyl aromatic) polymer such as polystyrene or a polystyrene-butadiene block copolymer. A suitable blowing agent is a mixture comprising (a) one or more fluorine-containing carbon compounds and (b) carbon dioxide, nitrogen, an alcohol having from 1 to 4 carbon atoms, a linear or cyclic hydrocarbon having from 1 to 6 carbon atoms, a ketone, an alkyl ether, an alkyl halide, water or a mixture thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.