Titanium dioxide pigment
US4239548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1979 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Dec 6, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Commercial titanium dioxide pigments to be used in paper laminates have been prepared by a method which involves calcining a coated pigment. A new pigment having an excellent stability to degradation by light when used in such laminates is produced without calcination of the coated pigment. The pigment comprises rutile titanium dioxide particles having an inner coating containing cerium and phosphate radicals and an outer coating containing aluminium and phosphate radicals and optionally hydrous alumina. The pigment preferably contains a surface stabilizer such as a fluoride, preferably calcium fluoride. Amounts of cerium phosphate are from 0.05% to 1% (as CeO.sub.2) and of aluminium phosphate between 0.05% and 5% by weight (as Al.sub.2 O.sub.3) on TiO.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.