Composition and method for enhancing stain resistance and product of enhanced stain resistance therefrom

An aqueous formulation for providing resistance to staining by acid colorants in a fibrous polyamide or wool substrate comprising in an aqueous vehicle:

• a sulfonated aromatic condensation resin, said resin being a condensation product of:
• i) a sulfonated dihydroxydiphenyl sulfone;
• ii) a dihydroxydiphenyl sulphone;
• iii) a sulfonated naphthalene and iv) an aldehyde, wherein said aqueous vehicle contains said condensation resin, a methacrylic acid polymer having a weight average molecular weight of 50,000 to 500,000 and a number average molecular weight of 25,000 to 150,000, a fluorochemical, an acid and a salt.

A method of imparting stain resistance to acid colorants, to a fibrous polyamide or wool substrate comprising:

• contacting said fibrous polyamide or wool substrate with a sulfonated aromatic condensation resin in an aqueous vehicle, said resin being a condensation product of:
• i) a sulfonated dihydroxydiphenyl sulfone;
• ii) a dihydroxydiphenyl sulfone;
• iii) a sulfonated naphthalene and iv) an aldehyde.