Process for the preparation of silane polysulfides
US5489701A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1995 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Feb 2, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/1892
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sulfur-containing organosilicon compounds useful as coupling agents in vulcanizable rubbers to enhance various properties, including low rolling resistance for automobile tires, are prepared. Preferred compounds include .OMEGA.,.OMEGA.'-bis (trialkoxysilylalkyl) polysulfides. The compounds are prepared by reacting sodium ethoxylate with hydrogen sulfide gas to yield a sodium sulfide solution, and then reacting this product with a slurried mixture of elemental sulfur and chloropropyltriethoxysilane to form the compound 3,3'-bis (triethoxysilylpropyl) tetrasulfide. The use of hydrogen sulfide gas and sodium metal alcoholates provides an efficient and economical process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.