Copolymers for stain resistance

A method for imparting resistance to staining to a substrate comprising contacting said substrate with a copolymer comprising the monomers of Formula I

• wherein
• D is at least one vinyl monomer selected from the group consisting of aryl olefin, alpha olefin and diene,
• each M is independently H, Ca, Mg, Al, Na, or K,
• each R1 is independently H, C1-C6 alkyl, or C1-C6 hydroxyalkyl,
• each R2 is independently linear or branched C1-C12 alkyl, C1-C6 hydroxyalkyl, C6F5, arylalkyl, C6H4OH, R3COOH, or R3SO3H,
• or R1 and R2 are linked together to form a morpholino or pyrrolidino ring,
• R3 is linear or branched C1-C12 alkyl, CH(COOH)CH2CH2, C6H4, or C6H3(OH),
• h1+h2 is h, h is a positive integer,
• k is zero or a positive integer,
• i and j are each independently zero or a positive integer,
• provided that the total of 1) h÷(k+h+i+i) is from about 0.005 to about 0.7, 2) k÷(k+h+i+i) is from about 0.3 to about 0.6, 3) [i+j](k+h+i+i) is 0 to about 0.6, and provided that the sum of 1)+2)+3) is 1.0,
• said monomers occurring in any sequence;
• wherein the copolymer of Formula I is prepared by contacting 1) a copolymer of maleic anhydride and styrene, or a copolymer of maleic anhydride and a 1-alkene, with 2) an amino-hydroxybenzenesulfonic acid which is 3-amino-4-hydroxybenzenesulfonic acid.