Colorant and preparation method thereof
US11208561B2 · kind B2 · utility
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7Claims
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Assignee
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Key dates
| Filing date | Aug 9, 2017 |
| Grant date | Dec 28, 2021 |
| Priority date | — |
| Expiry date | Jul 29, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/64
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention discloses a rare-earth sulfide colorant and a preparation method thereof. The chemical formula of the rare-earth sulfide colorant of the present invention is RE2-2xS3-3x.2y [REPO4], wherein RE is selected from one or more of La, Ce, Pr, Nd and Sm, and the ratio of y to x is 0.001 to 0.65. The present invention also discloses use of a phosphorus-containing compound for increasing the vividness of a rare-earth sulfide colorant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.