Soft-settling fluosilicate-treated silica flatting agent
US4095994A · kind A · utility
5Cited by
1References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1977 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Jan 7, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/82
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Finely divided, fluosilicate-treated silica, such as silica flatting agent for use in coating formulations, is prepared by blending in a dry, finely divided state, silica and divalent metal fluosilicate, notably magnesium fluosilicate. In a preferred embodiment, dry pellets of amorphous, precipitated silica and dry magnesium fluosilicate are milled together to produce the fluosilicate-treated flatting agent. In another embodiment, an aqueous solution of magnesium fluosilicate is applied to silica pellets which are then milled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.