Laminate paper treated with inorganic pigments having improved dispersability
US9120074B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2012 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Oct 11, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The disclosure provides a laminate paper comprising a treated inorganic core particle, in particular treated titanium dioxide (TiO2) particle, having improved dispersability, prepared by a process comprising: (a) heating a slurry comprising porous silica treated inorganic core particle and water at a temperature of at least about 90° C.; and (b) adding a soluble alumina source to the slurry from step (a) while maintaining the pH at about 8.0 to 9.5 to form an alumina treatment on the porous silica treated inorganic core particle; wherein the treated inorganic core particle does not comprise dense silica or alumina treatments, and has silica present in the amount of about 7% to about 14% and alumina present in the amount of about 4.0% to about 8.0%; and wherein the particle to particle surface treatments are substantially homogeneous.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.