Cationic electrodeposition coating composition

Patent metadata

Field	Value
Publication number	US-10550282-B2
Application number	US-201614992092-A
Country	US
Kind code	B2
Filing date	Jan 11, 2016
Priority date	Jan 20, 2015
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

An object of the present invention is to find a cationic electrodeposition coating composition excellent in throwing power, anti-GA gas pinhole properties, and anti-corrosion properties, and to provide a coated article excellent in these coating film properties. The present invention provides a cationic electrodeposition coating composition containing an amino-containing epoxy resin (A), a blocked polyisocyanate curing agent (B), and a pigment (C), the amino-containing epoxy resin (A) being obtained by reacting an epoxy resin (A1), a polyphenol compound (A2), a dimer acid diglycidyl ester (A3), and an amine compound (A4).

First claim

The invention claimed is:

1. A cationic electrodeposition coating composition comprising:
an amino-containing epoxy resin (A),
a blocked polymethylene polyphenyl isocyanate (MDI) (B), and
a pigment (C),
wherein the amino-containing epoxy resin (A) is obtained by reacting an epoxy resin (A1), a polyphenol compound (A2), a dimer acid diglycidyl ester (A3), and an amine compound (A4), and
wherein the dimer acid of the dimer acid diglycidyl ester (A3) is a dimer of at least one unsaturated fatty acid selected from the group consisting of oleic acid, eicosenoic acid, docosenoic acid, branched octadecenoic acid, branched hexadecenoic acid and undecylenic acid.

2. The cationic electrodeposition coating composition according to claim 1 , wherein the dimer acid diglycidyl ester (A3) contains linear, branched, and/or cyclic hydrocarbon groups that altogether contain 10 to 150 carbon atoms.

3. The cationic electrodeposition coating composition according to claim 1 , wherein the dimer acid diglycidyl ester (A3) is present in an amount of 0.1 to 50% by mass based on the solids content in the amino-containing epoxy resin (A).

4. The cationic electrodeposition coating composition according to claim 1 , further comprising an amine-added resin for pigment dispersion (D), wherein the amine-added resin (D) is obtained by reacting an epoxy resin with an amine compound.

5. A method of coating, comprising immersing a metal article in a bath of the cationic electrodeposition coating composition according to claim 1 to coat the metal article by electrodeposition.

6. A coated article obtained by the coating method according to claim 5 .

Assignees

• Toyota Motor Co Ltd
• Kansai Paint Co Ltd

Inventors

• Yamaguchi Takeo
• Mori Motohide
• Nakamura Masahiro
• Hosono Hiroshi
• Hanatani Minoru
• Setodoi Shigetaka

Classifications

• C09D5/08

  Anti-corrosive paints · CPC title

• C08G59/1494

  followed by a further chemical treatment thereof · CPC title

• C09D5/4438 Primary

  Binder based on epoxy/amine adducts, i.e. reaction products of polyepoxides with compounds containing amino groups only · CPC title

• C08G59/1433

  with organic low-molecular-weight compounds · CPC title

• C09D5/44

  for electrophoretic applications (processes for coating by electrophoresis C25D13/00) · CPC title