Partially crosslinked silalactone polymers, their preparation and their use
US4033731A · kind A · utility
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5References
3Claims
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Assignee
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Key dates
| Filing date | Jul 29, 1975 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Jul 29, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/68
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Linear homopolymers of 3,5,5-trimethyl-5-sila-.delta.-valerolactone are crosslinked through the 5-methyl group, e.g. by heating with an organic peroxide, to give polymers. Films of these crosslinked polymers have a critical surface tension similar to Teflon and can be used for water proofing. The films also exhibit selective permeability to gases and can be used to reduce the CO.sub.2 content of CO.sub.2 /O.sub.2 mixtures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.