Method for producing dual zone materials by use of an organosilane mixture
US4950634A · kind A · utility
20Cited by
19References
21Claims
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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 an aprotic solvent with an organosilane mixture of a first organosilane having first silyl groups and a second organosilane of a second type in order to form first silyl groups predominantly or the external surfaces of the porous support and second silyl groups predominantly on the internal surfaces of the porous support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.