Water-soluble coating composition

A water-soluble coating composition comprising an adduct (1) of a butadiene lower polymer or lower copolymer with a co-monomer (A) selected from the group consisting of isoprene, 2,3-dimethyl butadiene, piperylene, .alpha.-methyl styrene, vinyltoluene and divinylbenzene, said polymer or copolymer having a number average molecular weight in the range of 200-10,000 and being liquid or semi-solid at room temperature and .alpha.,.beta.-ethylenically unsaturated dicarboxylic acid compound (B) selected from the group consisting of maleic anhydride, citraconic anhydride, 1,2-diethylmaleic anhydride, maleic acid monomethyl ester, maleic acid dimethyl ester and maleic acid diethyl ester resulting from the reaction of said (A) and (B) at a temperature in the range of 120.degree. to 250.degree. C. in the presence of at least one quinoline derivative (C) in an amount of 0.005 to 5 percent by weight of said (A), said quinoline derivative being of the general formula:

• ##STR27## in which R.sub.1 is a hydrogen atom or an alkoxy group having 1 to 5 carbon atoms, and R.sub.2, R.sub.3 and R.sub.4 are the same or different alkyl groups each having 1 to 5 carbon atoms;
• a hydrophilic solvent (2) in an amount of less than 100 parts by weight to 100 parts by weight of said (A), said hydrophilic solvent being selected from the group consisting of methanol, ethanol, butanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, tetrahydrofuran, dioxane, diacetone alcohol, acetone, methyl ethyl ketone and methyl acetate;
• and a neutralizer (3) in a range of 0.2 to 2.0 equivalents to said (A), said neutralizer being selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonia water, diethylamine, triethylamine, N-morpholine, ethylenediamine, diethylenetriamine, monoethanolamine, diethanolamine, triethanolamine and cyclohexylamine.

A water-soluble coating composition comprising an adduct (1) of a butadiene lower polymer or lower copolymer with a co-monomer (A) selected from the group consisting of isoprene, 2,3-dimethyl butadiene, piperylene, .alpha.-methyl styrene, vinyltoluene and divinylbenzene and 3-50 percent by weight of an .alpha.,.beta. ethylenically unsaturated dicarboxylic acid compound (B) selected from the group consisting of maleic anhydride, citraconic anhydride, 1,2-diethylmaleic anhydride, maleic acid monomethyl ester, maleic acid dimethyl ester and maleic acid diethyl ester resulting from the reaction of said (A) and (B) at a temperature of 120.degree.-250.degree. C. in the presence of from 0.005-5 percent by weight to the amount of said (A) of one or more of compounds (C) selected from the group consisting of 1,2-dihydro-2,2,4-trimethylquinoline, 1,2-dihydro-2,2,4-triethylquinoline, 1,2-dihydro-2,2,4-tri-n-propylquinoline, 1,2-dihydro-2,2,4-tri-n-butylquinoline, 1,2-dihydro-2,2-dimethyl-4-ethylquinoline, 1,2-dihydro-2,2,4-trimethyl-6-methoxyquinoline, 1,2-dihydro-2,2,4-trimethyl-6-propoxyquinoline and 1,2-dihydro-2,2,4-trimethyl-6-n-butoxyquinoline;

• a hydrophilic solvent (2) selected from the group consisting of methanol, ethanol, butanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, tetrahydrofuran, dioxane, diacetone alcohol, acetone, methyl ethyl ketone and methyl acetate in an amount of less than 100 parts by weight to 100 parts by weight of the amount of said (A);
• and a neutralizer (3) selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonia water, diethylamine, triethylamine, N-morpholine, ethylenediamine, diethylenetriamine, monoethanolamine, diethanolamine, triethanolamine and cyclohexylamine in the amount of 0.2 to 2.0 equivalents to the amount of said (A).