Toluene sulfonic acid swelling of perylene pigments
US6464773B1 · kind B1 · utility
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5References
9Claims
0Family size
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Key dates
| Filing date | Nov 10, 2000 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Nov 10, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0017
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of acid swelling crude perylene pigment by treating the crude with about 2 to 10 parts by weight of toluene sulfonic acid at an elevated pressure and at temperatures ranging from 40 to 140° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.