Patent ID: 7435266

Claim:
A process for dyeing textile materials comprising the steps of: providing a cellulosic textile material comprising cellulosic fibers, wherein the cellulosic fibers have hydroxyl groups; contacting the cellulosic textile material with a polymeric anionic reactive compound having repeating units containing two or more anionic functional groups, wherein a portion of the anionic functional groups of the polymeric anionic reactive compound bonds to the hydroxyl groups of the cellulosic fibers; thereafter, contacting the cellulosic textile material with a polyvinylamine having amine groups; curing the cellulosic textile material such that a portion of the amine groups of the polyvinylamine form a covalent bond with unbonded anionic functional groups on the polymeric anionic reactive compound; and thereafter, contacting said cellulosic textile material with an acid dye.