Kansai Paint Company, Ltd.

Yoh Sugimura

Yoshiyuki Yukawa

Motoshi Yabuta

Akimasa Nakahata

Yasuhiro Fujii

The present invention provides: (1) a self-crosslinking resin (I) having a blocked isocyanate group and a hydroxyl group in the molecule and characterized in that the resin is prepared from a vinyl polymer (A) having at least two free isocyanate groups in the molecule and an acrylic resin (B) having at least two hydroxyl groups in the molecule by reacting some of the hydroxyl groups of the resin (B) with some of the free isocyanate groups of the polymer (A), and subsequently reacting a blocking agent with all the remaining free isocyanate groups, and (2) a self-crosslinking resin (II) having a blocked isocyanate group and a hydroxyl group in the molecule and characterized in that the resin is prepared from a vinyl polymer (C) having a free isocyanate group and a blocked isocyanate group in the molecule and the acrylic resin (B) having at least two hydroxyl groups in the molecule by reacting some of the hydroxyl groups of the resin (B) with all the free isocyanate groups of the polymer (C).

Process for preparing self-crosslinking resin

(1) A coating resin composition consisting essentially of a self-crosslinking resin (I) having at least one hydroxyl group and at least one blocked isocyanate group in the molecule wherein the resin (I) is prepared by reacting some of the free isocyanate groups of a vinyl polymer (A) having at least two free isocyanate groups in the molecule with some of the hydroxyl groups of a polyolefin resin (B) having at least two hydroxyl groups in the molecule, and subsequently reacting a blocking agent with the remaining free isocyanate groups, and (2) a coating resin composition consisting essentially of a self-crosslinking resin (II) having at least one hydroxyl group and at least one blocked isocyanate group in the molecule wherein the resin (II) is prepared by reacting all free isocyanate groups of a vinyl polymer (C) having at least one free isocyanate group and at least one blocked isocyanate group in the molecule with some of the hydroxyl groups of a polyolefin resin (B) having at least two hydroxyl groups in the molecule.

Growing community of inventors

Odawara, Japan

Yoh Sugimura