Patent ID: 6024770
Filing Date: 2000-02-15
Classification: D06M,D06P,Y10S

Abstract:
Method for producing a stain resistant substrate with the aid of a stain resistance improving agent, said method comprising:(A) providing a substrate containing polyamide fiber,(B) contacting said substrate with an acidic aqueous solution having a pH of up to about 6 and containing a tannic acid stain resistance improving agent in a concentration of 5 to 50 g/l,(C) bringing about such contact between said substrate and said at least one tannic acid prior to, during or after application of dye to the substrate,(D) the dyeing of said substrate taking place or having taken place at a temperature up to about 90.degree. C.,(E) drying the substrate with said tannic acid stain resistance improving agent thereon, and(F) recovering a dried, permanently dyed polyamide fiber-containing substrate wherein(1) the tannic acid stain resistance improving agent consists of at least one tannic acid, and(2) the polyamide fiber-containing substrate thus recovered is resistant to stains caused by any of the members of the group consisting of anionic dye, cationic dye, disperse dye and metallocomplex dye, and also by oxidative bleaching agent.