Process for fabricating sol-gel article involving low-shrinkage formulation
US6457329B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2000 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Dec 14, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C1/006
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A silica sol-gel fabrication process is provided which allows improved control of the shrinkage that takes place during the drying of a gel body. In particular, the invention makes it possible to attain extremely low shrinkage through the completion of the drying stage, e.g., below 1% linear shrinkage, in relatively large sol-gel bodies of (dry weight) 1 kg or more, typically 10 kg or more, or even 40 kg or more, compared to the much higher shrinkages typically encountered. Specifically, use of a particular polymeric additive makes it possible for a gel body to experience linear shrinkage at least 55% less than an identical process without the polymeric additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.