Extrudable pre-ceramic polycarbosilanes
US5028678A · kind A · utility
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2References
9Claims
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Assignee
Inventors
Key dates
| Filing date | Nov 27, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Nov 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/571
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Extrudable pre-ceramic polycarbosilanes are prepared by intimately contacting a crude polycarbosilane containing a fraction of high molecular weight polymers (e.g., molecular weights greater than about 25,000) with ethyl acetate, whereby selectively dissolving desired extrudable polycarbosilane essentially devoid of such fraction of high molecular weight polymers in the ethyl acetate, and then recovering such dissolved polycarbosilane from the ethyl acetate solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.