Abstract: This invention provides a process for producing an aqueous resin dispersion in which the average particle diameter of the dispersed resin is not more than 500 nm, comprising finely dispersing a monomeric mixture (I) containing (A) fatty acid-modified polymerizable unsaturated monomer and (B) other polymerizable unsaturated monomer which is copolymerizable with the monomer (A) in an aqueous medium in such a manner that the dispersed particles have an average particle diameter not more than 500 nm, and polymerizing the resulting emulsified product. The invention also provides aqueous resin compositions which comprise the aqueous resin dispersions, and water-based paint compositions which comprise the aqueous resin compositions.

Abstract: This invention provides a process for producing an aqueous resin dispersion in which the average particle diameter of the dispersed resin is not more than 500 nm, comprising finely dispersing a monomeric mixture (I) containing (A) fatty acid-modified polymerizable unsaturated monomer and (B) other polymerizable unsaturated monomer which is copolymerizable with the monomer (A) in an aqueous medium in such a manner that the dispersed particles have an average particle diameter not more than 500 nm, and polymerizing the resulting emulsified product. The invention also provides aqueous resin compositions which comprise the aqueous resin dispersions, and water-based paint compositions which comprise the aqueous resin compositions.

Abstract: The present invention relates to a coating finishing method comprising coating a water-based under coating material (I) on a surface of a metal substrate or an old coated face of a metal substrate and then coating a water-based coating material (II) comprising a water-based fatty acid-modified acryl resin as a base resin component, wherein the above water-based coating material (II) contains a pigment in a pigment volume concentration falling in a range of 5 to 45%, and the above water-based fatty acid-modified acryl resin has a form of a fine particle having an average particle diameter falling in a range of 50 to 500 nm. According to the method of the present invention, capable of being formed is a finished coating film which has a good finished appearance and which can maintain a fine view of metal surfaces used for structures such as buildings, bridges and plant facilities over a long period of time.

Abstract: This invention provides a curable resin composition for one-pack type water-based paint which is readily cured regardless of coating environment, said resin composition characteristically comprising both copolymer (I) which is produced from the emulsion polymerization of 1 to 30 % by weight of maleimide group-containing ethylenically unsaturated monomer (a), 1 to 30 % by weight of carbonyl group-containing ethylenically unsaturated monomer (b), 0.01 to 2 % by weight of compound (c) having two or more polymerizable unsaturated group per molecule and 38 to 97.99 % by weight of another ethylenically unsaturated monomer (d), and compound (II) which has, per molecule, two or more same or different functional groups selected from hydrazide group, semicarbazide group and hydrazone group.

Abstract: The present invention relates to a curing type water base resin composition comprising: (I) a copolymer obtained by copolymerizing an ethylenically unsaturated monomer (a) having a maleimide group, an ethylenically unsaturated monomer (b) having a carbonyl group and other ethylenically unsaturated monomer (c) and (II) a compound having two or more groups per molecule which are the same or different and selected from a hydrazide group, a semicarbazide group and hydrazone group and further comprising, if necessary, as an additional component: (III) a copolymer having a carbonyl group and/or (IV) a water base polyurethane resin having a carbonyl group or a hydrazine group.

Abstract: The present invention relates to a curing type water base resin composition comprising: