Method for coloring cellulose
US10557231B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2015 |
| Grant date | Feb 11, 2020 |
| Priority date | — |
| Expiry date | May 30, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for coloring of cellulose in a supercritical CO2 medium by an uncharged hydrophobic dye, including at least the steps including of: (i) provision of cellulose fibers, (ii) placing the cellulose fibers in the presence of: a) an effective quantity of at least one uncharged mono organo-urea primer of formula R—NH—CO—NH2, where R represents a linear or branched, saturated or unsaturated, hydrocarbon chain possessing at least 3 carbon atoms, or a saturated or unsaturated cyclic hydrocarbon radical, which is bonded directly or via a methylene or ethylene group to a nitrogen atom, and if appropriate substituted under conditions conducive to the forming of a covalent carbamatic bond between the cellulose and the molecules of the organo-urea; and b) at least one hydrophobic dye in a supercritical CO2 medium, under conditions conducive to the immobilization of the dye on the fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.