Method of polymerizing polydiorganosiloxane fluid-filler mixture using sulfuric or sulfonic acids
US4482670A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1983 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Mar 14, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of polymerizing an oligomer comprising a polydiorganosiloxane, polydiorganocyclosiloxane, or mixture thereof in the presence of reinforcing filler using a catalytic amount of sulfuric or sulfonic acid is described. The sulfonic acid is of the formula XSO.sub.3 H wherein X is selected from the group consisting of halogen, alkyl, aryl, alkoxy, and alkaryl radicals. The dispersion of reinforcing filler in polydiorganosiloxane is produced using less energy, with fewer manufacturing steps than current commerical processes. The silicone polymer-filler mixture produced by this method is useful as electrical insulation compounds, in greases, and in producing curable compositions useful as sealants, caulking compounds, and heat curable silicone elastomeric compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.