Polyphosphoric acid swelling of organic pigments
US6537362B1 · kind B1 · utility
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8Claims
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Key dates
| Filing date | Nov 10, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Nov 10, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0019
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of conditioning an organic crude pigment by treating, under high shear, 1 part by weight of the crude pigment and about 0.5 to 1.9 parts by weight of polyphosphoric acid or polyphosphoric acid methyl ester at a temperature ranging from about 90 to 160° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.