Treated titanium dioxide pigment, process of making thereof and use thereof in paper manufacture
US12110634B2 · kind B2 · utility
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12References
4Claims
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Key dates
| Filing date | Jun 19, 2019 |
| Grant date | Oct 8, 2024 |
| Priority date | — |
| Expiry date | Jun 19, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Process for the surface treatment of a titanium dioxide pigment, characterized in that it comprises the following steps: an aqueous suspension of titanium dioxide pigments is formed, in a first step, a layer of alumina phosphate is precipitated on the surface of the pigment, in a second step, a layer of alumina is precipitated over the first layer of alumina phosphate, and in an optional third step, a layer of magnesium oxide is precipitated on the layer of alumina. Titanium dioxide pigments made by the disclosed process and method using said pigments in paper manufacturing are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.