Process for the production of monoazo lake pigment coated with water-insoluble rosin and improved in lipophilic nature and water resistance
US5243031A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1992 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Jan 6, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S534/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the production of a monoazo lake coated with a water-insoluble metal salt of rosin, which comprises the steps of: PA0 (a) adjusting a mixed solution containing a monoazo dye having a water-soluble group and an alkali metal or ammonium salt of rosin to pH of 8 to 12, and adding an stoichiometeric amount of a metal salt of at least one metal for insolubilizing rosin selected from the group consisting of zinc, aluminum, copper and manganese to form a water-insoluble rosin metal salt, and PA0 (b) adjusting the resultant mixture containing the water-insoluble rosin metal salt to pH of 9 to 12 and adding a metal salt of at least one metal for forming a lake of a monoazo dye selected from the group consisting of calcium, barium and strontium to form a monoazo lake.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.