Process for making composite colorant particles
US6635693B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2001 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Jan 16, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/897
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for making composite colorant particles comprising, in order:I) suspending in an aqueous medium, under agitation, finely divided colorant particles to form an aqueous colorant mixture;II) adding to the aqueous colorant mixture an addition polymerization initiator; andIII) causing the addition polymerization initiator to form a free radical while continuously introducing continuously to the aqueous colorant mixture a monomer mixture comprising:a) an addition polymerization initiator, andb) at least one ethylenically-unsaturated monomer;thereby forming the composite colorant particles having a colorant phase and a polymer phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.