Selected crystalline calcium carbonate builder for use in detergent compositions
US6610645B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 10, 1999 |
| Grant date | Aug 26, 2003 |
| Priority date | — |
| Expiry date | Sep 10, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/1233
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A detergent composition containing an inexpensive detergent builder in the form of a selected crystalline calcium carbonate is provided. Specifically, the crystalline calcium carbonate has a substantially rhombohedral crystal structure with {1,0-1,1} crystallographic indices. The crystalline calcium carbonate can be calcite that has been specially modified to a rhombohedral crystal structure with {1,0-1,1} indices. The crystalline calcium carbonate of the present invention is extremely inexpensive because it can be readily formed from inexpensive naturally occurring calcite, and it performs well even when used at large median particle sizes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.