solubility of at least 5 by weight at 25 u00b0 c and practical examples thereof are polyvinyl alcohol methyl cellulose carboxymethyl cellulose starches including modified starch gelatin gum arabic casein a hydrolyzed product of a styrene maleic anhydride copolymer carboxy modified polyvinyl alcohol polyacrylamide and a saponification product of a vinyl acetate polyacrylic acid copolymer the preferred molecular weight of the water soluble high molecular weight compound is from 10 000 to 100 000 also as the copolymer formed from the monomer of the above formula i and the monomer of the above formula ii having a weight average molecular weight of not more than 10 000 for use in this invention there are sodium salts potassium salts ammonium salts etc of a copolymer of maleic acid and 1 methyl 1 2 2 dimethylpropyl ethylene a copolymer of maleic acid and 1 methyl 1 3 methylbutyl ethylene a copolymer of maleic acid and 1 2 2 dimethylpropyl ethylene a copolymer of maleic acid and 1 methyl 1 octylethylene etc the preferred molecular weight of the copolymer is from 2 000 to 10 000 the addition amount of the water soluble high molecular weight compound as the dispersing aid is preferably from 1 by weight to 25 by weight and more preferably from 2 by weight to 15 by weight based on the amount of organic compound s being dispersed if the.