Method for producing dual zone materials by catalyzed halosilylation
US4950635A · kind A · utility
26Cited by
19References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Sep 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2995
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Dual zone porous materials having an external zone and an internal zone are prepared by contacting a suspension of a porous support, such as particulate silica, in a solvent with a halosilane and a catalyst for the halosilane in order to form first silyl groups predominantly on the external surfaces of the porous support. Preferably thereafter the porous support is contacted with a silane having second silyl groups in order to a form second silyl groups predominantly on the internal surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.