High cleaning silica gel dental abrasive, dentifrices prepared therefrom, and a method for preparing the dental abrasive
US6896876B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2002 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Jan 31, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/59
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A silica gel abrasive having good cleaning and low abrasion is prepared by combining at least two silica gels before adjusting the pH of the abrasive to a pH in the range of 3-6. One of the gels is washed at relatively lower temperature compared to the wash temperature of a second gel. The two gels are then milled and dried to a median particle size in the range of 5 to 12 microns. The volatiles content of the gel combination is in the range of 20-40% by weight. The resulting mixtures have low abrasion as measured by Einlehner, e.g., in the range of 0.5 to 3 when measured using a brass screen. A dentifrice composition comprising 10 to 25% of the abrasive has a PCR of at least 80 and can obtain PCR's greater than 100.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.