High char yield silazane-modified phenolic resins
US5089552A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1989 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Dec 8, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/549
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The hydrolytic polycondensation of a monomer of ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently alkyl groups containing from 1 to 4 carbon atoms, R.sup.a, R.sup.b, R.sup.c, and R.sup.d are independently alkenyl or alkyl groups containing from 2 to 6 carbon atoms with the proviso that at least one of R.sup.a, R.sup.b, R.sup.c, or R.sup.d group is an alkenyl group; can be carried out directly in the presence of a phenolic resin. This in situ polymerization reaction results in the formation of a new family of polysilazoxane-modified phenolic resins. Modified phenolic resins may also be prepared by the controlled hydrolysis of the above monomers in the presence of initiators. The polysilazoxane so formed is blended into a phenolic resin. The organic soluble thermosetting resins exhibit synergistic char yields of 63 to 80 wt. % (1500.degree. C./N.sub.2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.