Talc substances having specific surface properties, methods of manufacture and applications
US5229094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Feb 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to talc substances consisting of particles having a sheet structure. These substances are characterised in that each particle has internally the crystalline structure of talc which confers upon it certain specific properties of this mineral (softness, thermal stability) and has hydrophilic surface properties unlike the hydrophobic properties of mineral talc which give rise to useful reactivity. The substances according to the invention have a thermal and chemical stability range similar to that of talc. They can be manufactured by thermal or chemical means under conditions designed to avoid internal conversion of the talc and to effect the surface modifications consisting of replacing inert siloxane bridges by active hydrophilic groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.