Alkenyl aromatic foam with low solubility hydrofluorocarbon
US8785510B2 · kind B2 · utility
0Cited by
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8Claims
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Key dates
| Filing date | Mar 13, 2008 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Apr 3, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Prepare a closed-cell alkenyl aromatic polymer foam by an extrusion process using a blowing agent composition that contains at least 30 weight-percent of the chlorine-free hydrofluorocarbon blowing agent such that the foam has a density of 48 kilograms per cubic meter or less, contains more than 50 weight-percent styrene-acrylonitrile copolymer based on total polymer weight and at least eight weight-percent of a chlorine-free hydrofluorocarbon blowing agent that has a lower solubility in polystyrene than 1,1,2,2-tetrafluoroethane (HFC-134).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.