acid azelaic acid sebacic acid undecanedicarboxylic acid isophthalic acid phthalic acid terephthalic acid 1 2 cyclohexanedicarboxylic acid 1 3 cyclohexanedicarboxylic acid 1 4 cyclohexanedicarboxylic acid 1 2 benzenesulfonic acid 1 3 benzenesulfonic acid aconitic acid 1 2 3 propanetricarboxylic acid 1 2 4 benzenetricarboxylic acid 1 3 5 benzenetricarboxylic acid 1 3 5 cyclohexanetricarboxylic acid 1 2 3 4 butanetetracarboxylic acid and pyromellitic acid polymers as synthesized using u03b1 u03b2 unsaturated carboxylic sulfonic or phosphoric acids such as meth acrylic acid maleic acid itaconic acid 4 pentenoic acid 2 sulfoethyl meth acrylate 2 acrylamido 2 methylpropanesulfonic acid u03b2 meth acryloyloxyethyl hydrogen succinate u03b2 meth acryloyloxyethyl hydrogen phthalate and methacryloylethyl phosphate as one comonomer polyepoxy compounds into which carboxyl groups are introduced by reacting an epoxy group of epoxy compounds and or a hydroxyl group with polyvalent carboxylic acids styrenic polymers comprising the above mentioned u03b1 u03b2 unsaturated carboxylic sulfonic or phosphoric acids as one comonomer styrenic block copolymers into which carboxyl groups are introduced by adding maleic anhydride diene polymers as produced by copolymerizing the above mentioned u03b1 u03b2 unsaturated carboxylic sulfonic or phosphoric acids or diene polymers into which carboxyl groups are introduced by adding maleic anhydride olefinic polymers as produced by copolymerizing the above mentioned u03b1 u03b2 unsaturated carboxylic sulfonic or phosphoric acids and ethylene vinyl acetate copolymers as produced by copolymerizing the above mentioned u03b1 u03b2 unsaturated carboxylic sulfonic or phosphoric acids incidentally the meth acrylic polymer referred to in the present invention is one kind of polymer as synthesized using at least one member selected from the group consisting of.