Surface modified calcium carbonate composition and uses therefor
US5531821A · kind A · utility
99Cited by
5References
9Claims
0Family size
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Inventor
Key dates
| Filing date | Aug 24, 1995 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Aug 24, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved form of calcium carbonate which is acid resistant to enable its use as a filler material in the making of neutral to weakly acid paper, and a process for producing this acid-resistant calcium carbonate is provided. This acid-resistant calcium carbonate comprises calcium carbonate in admixture with at least about 0.5 to about 10 percent, based on the dry weight of the calcium carbonate, of a cationic salt, together with at least about 0.5 to about 10 percent, based on the dry weight of the calcium carbonate, of an anionic salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.