Chemical compounds
AssigneeZeneca Limited
InventorsAndrew H. M. Renfrew, Andrew P. Shawcross
Life of this patent
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Abstract
A process for the coloration of a substrate, especially a textile, comprising the steps of: (a) applying to the substrate a mixture comprising an aqueous solvent and a water-soluble dye comprising molecules which contain a nucleophilic group and an electrophilic group; and (b) heating or basifying or heating and basifying the dye thereby causing molecules of the dye to join together. Also claimed are dyes, polymers and oligomers.
Claims18
A process for the coloration of leather, paper or a textile material comprising the steps of:
- (a) applying to the substrate a mixture comprising an aqueous solvent and a water-soluble dye comprising molecules which contain a nucleophilic group and an electrophilic group;
- and
- (b) heating or basifying or heating and basifying the dye thereby causing molecules of the dye to join together by formation of a covalent bond between the nucleophilic group of one molecule and the electrophilic group of another molecule of the dye;
- wherein the water-solubility of the dye molecules joined together by step (b) is less than 10% of the water-solubility of the original water-soluble dye.
A process according to claim 2 wherein the heating or basifying or heating and basifying forms a dye of lower water-solubility and higher affinity for the substrate,
A process for the coloration of a substrate comprising the steps of:
- (a) applying to the substrate a mixture comprising an aqueous solvent and a water-soluble dye comprising molecules which contain a nucleophilic group and an electrophilic group;
- and
- (b) heating or basifying or heating and basifying the dye thereby causing molecules of the dye to join together;
- wherein the molecules joined together by step (b) are free from sulpho groups.
A process for the coloration of a substrate comprising the steps of:
- (a) applying to the substrate a mixture comprising an aqueous solvent and a water-soluble dye comprising molecules which contain a nucleophilic group and an electrophilic group;
- and
- (b) heating or basifying or heating and basifying the dye thereby causing molecules of the dye to join together;
- wherein
- (i) the substrate is leather, paper or a textile material;
- and
- (ii) the nucleophilic group comprises an aminoalkyl, --SH or .dbd.S group.
Dependencies are inferred from the claim text.