Process for preparing transparent/semi-transparent color dispersions and the color dispersions made thereof
US10428235B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 21, 2018 |
| Grant date | Oct 1, 2019 |
| Priority date | — |
| Expiry date | Jun 21, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D133/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for preparing color dispersions comprising a first step of contacting water, a first colorant, and a polysaccharide selected from methylcellulose, hydropropylmethylcellulose, hydroxyethylmethylcellulose, hydroxybutylmethylcellulose, hydroxyethylethylcellulose, and the mixture thereof, to form a first colorant dispersion; a second step of contacting the first colorant dispersion with a protective composition comprising an aqueous dispersion of polymer particles, clay, and a peptizing agent to form a dispersion of protected first colorant particles; an optional third step of repeating the first step and the second step with a second colorant that is different from the first colorant to form a dispersion of protected second colorant particles; and an optional fourth step of mixing the dispersions of protected first and second colorant particles to form a multi-color dispersion. This invention also relates to a color dispersion comprising the first colorant dispersion, and a color coating comprising the color dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.