Patent ID: 7279013

Claim:
A method of imparting stain resistance to acid colorants, to a fibrous polyamide or wool substrate comprising: contacting said substrate with a semi-bleached to bleached sulfonated aromatic condensation resin in an aqueous vehicle, said resin being selected from the group consisting of condensation products of: i) phenolsulfonic acid, dihydroxydiphenyl sulfone and an aldehyde; ii) sulfonated dihydroxydiphenylsulfone, dihydroxydiphenyl sulfone and an aldehyde; iii) sulfonatecl dihydroxy diphenyl sulfone and an aldehyde; and iv) mixtures of i), ii) and iii); said aqueous vehicle further containing a semi-soluble methacrylic acid polymer having a weight average molecular weight of 100,000 to 500,000 and a number average molecular weight of 50,000 to 100,000, said methacrylic acid polymer being semi-soluble such that it is rendered resistant to wet cleaning processes thereby pipducing durable stain resistance, while providing initial stain resistance prior to wet cleaning of the substrate.