Rehydrated silica gel dentifrice abrasive
US4346071A · kind A · utility
5Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1980 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | Sep 11, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/412
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Silicas that provide improved abrasive action when incorporated in dentifrice compositions can be prepared by dehydrating a silica hydrogel to a low water content and then reintroducing water to gel. The silica hydrogel is prepared by neutralizing a sodium silicate with an acid. This hydrogel is dried by any convenient method so that the gel contains about 15% water or less. This dried gel is rehydrated to about 30% or more. The rehydrated gel provides improved abrasion values over the prior art xerogels and hydrogels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.