Hitachi Chemical Company, Ltd.

Ryoji Ukita

Takao Hirayama

Asao Isobe

Shigeyoshi Tanaka

A copolymer emulsion comprising (I) a copolymer obtained by copolymerizing (A) a dicyclopentadiene derivative, (B), an .alpha.,.beta.-unsaturated monomer having one or more OH groups, (C) an .alpha.,.beta.-unsaturated monomer copolymerizable with the components (A) and (B), followed by the reaction of the resulting copolymer with (D) a partial allyl ether of polyhydric alcohol having one or more terminal isocyanate groups, and (II) water can be cross-linked and cured at normal temperatures to give coating films particularly excellent in hardness, water resistance, corrosion resistance and solvent resistance.

Copolymer emulsion

A water-dispersible epoxy modified alkyd resin produced by reacting (A) 0-50 parts by weight of oil or oil fatty acid, (B) 10-50 parts by weight of polyhydric alcohol, (C) 0-25 parts by weight of monobasic acid having 6 to 18 carbon atoms, (D) 15-70 parts by weight of polybasic acid having 4 to 10 carbon atoms or its anhydride, (E) 5-25 parts by weight of polyoxyalkylene glycol having a molecular weight of 600 to 20,000, and (F) an epoxy compound, wherein the ratio of the hydroxyl groups to the carboxyl groups in the components (A) through (E) is 0.625-1.8 and the amount of the component (F) is 3-50 parts by weight per 100 parts by weight of the total weight of the components (A) through (E), can provide water-dispersible coatings having improved drying characteristics and water resistance as well as corrosion resistance.

Growing community of inventors

Hitachi, Japan

Ryoji Ukita