Reformed, inorganic polysilazane
US4933160A · kind A · utility
1Cited by
2References
6Claims
0Family size
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Inventors
Key dates
| Filing date | Mar 14, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Mar 14, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/62
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel, reformed, inorganic polysilazane which is liquid or solid at room temperature and soluble in o-xylene at room temperature and which has (a) a number-average molecular weight of 200-500,000, (b) contents of Si, N and H of 50-70% by weight, 20-34% by weight and 5-9% by weight, respectively; and (c) --SiH.sub.2 -- and --SiH.sub.3 groups, the molar ratio of the --SiH.sub.2 -- groups to the --SiH.sub.3 groups being 2.0:1 to 8.4:1. The reformed polysilazane is obtained by reaction of a solution of a polysilazane in an organic base-containing solvent to polycondense the polysilazane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.