Water-soluble dyes which are polymerizable containing molecules which contain a nucleophilic group and an electrophilic group
AssigneeZeneca Limited
InventorsAndrew Hunter Morris Renfrew, Andrew Paul Shawcross
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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 solid water-soluble dye containing an electrophilic group and a nucleophilic group containing an --SH or .dbd.S group, which dye when heated or basified or heated and basified causes the union of molecules of the dye by formation of a covalent bond between the electrophilic group of one molecule and the nucleophilic group of another molecule of the dye.
A water-soluble dye containing an electrophilic group and a nucleophilic group containing an --SH or .dbd.S group, which dye when heated or basified or heated and basified causes the union of molecules of the dye by formation of a covalent bond between the electrophilic group of one molecule and the nucleophilic group of another molecule of the dye to give a product having less than 25% of the water-solubility of the original dye.
A solid water-soluble dye containing, as a nucleophilic group, an --SH or .dbd.S group and additionally containing an electrophilic group, whereby when the dye is heated or basified or heated and basified said --SH or =S group allows formation of a covalent bond between the nucleophilic group of one molecule of the dye and the electrophilic group of another molecule of the dye so as to cause the union of said molecules of the dye.
A water-soluble dye containing, as a nucleophilic group, an --SH or .dbd.S group and additionally containing an electrophilic group, whereby when the dye is heated or basified or heated and basified said --SH or .dbd.S groups allows formation of a covalent bond between the nucleophilic group of one molecule of the dye and the electrophilic group of another molecule of the dye so as to cause the union of said molecules of the dye to give a product having less than 25% of the water-solubility of the original dye.
A water-soluble dye which contains a nucleophilic group and an electrophilic group wherein:
- (i) the nucleophilic group is selected from --SH and .dbd.S;
- (ii) the electrophilic group is an activated alkene or a group capable of undergoing an elimination and addition reaction;
- and
- (iii) any sulpho groups in the dye are removable by heating or basifying the dye.
Dependencies are inferred from the claim text.