Composite powder
US6537962B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Mar 17, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention pertains to a composite powder comprising (A) an alkali metal silicate particle having an average particle size of from 1 to 500 &mgr;m; and (B) a water-soluble salt particle having an average particle size of from 0.01 to 50 &mgr;m, of which solubility to water at 20° C. is 1 g/100 g or more, wherein the alkali metal silicate particle has a composition formula in an anhydride form represented by: xM2O.ySiO2.zMeO (I) wherein M stands for Na and/or K; Me stands for Ca and/or Mg; y/x is from 0.5 to 4.0; z/x is from 0 to 1.0; and Mg/Ca in MeO is from 0 to 10, and wherein the composite powder has a (A)/(B) weight ratio of from 1/9 to 99/1; and a detergent composition comprising the composite powder. The composite powder is a composite powder having a remarkably enhanced storage stability of the alkali metal silicate without impairing the ion exchange capacity owned by the alkali metal silicate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.