Process for introducing a gas into a polymer
US8871823B2 · kind B2 · utility
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2References
12Claims
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Assignee
Inventors
Key dates
| Filing date | Mar 24, 2006 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Dec 16, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2201/032
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A first polymer (preferably in granular form) is exposed to a gas at a pressure higher than atmospheric pressure to introduce the gas into the polymer. This occurs at a temperature from the glass transition temperature to the melting temperature when the first polymer is crystalline or semi-crystalline in nature, or at a temperature below the glass transition temperature when the first polymer is amorphous in nature. Optionally, the gas-laden polymer may then be mixed with a second polymer. The polymer is then melted to produce a foamed article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.