Inorganic pigments and methods for producing the pigments and aqueous slurries thereof
US4036663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1975 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Sep 15, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D17/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Finely divided inorganic pigments having improved wetting characteristics and which may be rapidly dispersed in an aqueous medium, and methods for preparing same, are disclosed. The improved pigments comprise blends or mixtures of inorganic pigment particulates, such as calcium silicate, hydrated silica, aluminum hydrates and sodium alumino silicates, etc. and a soluble deliquescent salt, such as the sulfates, nitrates and chlorides of aluminum and other metals. The pigments are produced by dry blending mixtures of the inorganic pigment and the soluble deliquescent salt. Conventional soaking periods on the order of 12 to 24 hours are reduced to less than 2 hours by the use of the improved pigments of the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.