Method for preparing an organo-silicon sol and materials obtained from such a sol
US7157518B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2003 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Jun 30, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2217/425
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The method consists in hydrolysing an initial volume Vse of a precursor material comprising at least one polyalkoxysilane with a quantity of water such thatwhere x H20 and x Si represent the number of moles of H20 and Si present, respectively, the concentration of the hydrolysate up to a volume substantially equal to the initial volume Vsi, leaving the concentrated hydrolysate until segregation into an aqueous phase and an organo-silicon phase, and recovery of the organo-silicon phase. A product can be obtained which comprises an organo-silicon sol comprising silicon species T1, T2, and T3, wherein the molar fraction of species T2 is equal or greater than 50%, comprising a condensation rate equal to or greater than 0.65, and further defined as lacking water, as determined by analyzing a sample of said organo-silicon sol by 1H NMR and observing the absence of peak corresponding to water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.