Cationic electrodeposition coating composition

Patent metadata

Field	Value
Publication number	US-2016208133-A1
Application number	US-201614992092-A
Country	US
Kind code	A1
Filing date	Jan 11, 2016
Priority date	Jan 20, 2015
Publication date	Jul 21, 2016
Grant date	—

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

1 . A cationic electrodeposition coating composition comprising:
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).

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 , the composition further comprising an amine-added resin for pigment dispersion (D), the amine-added resin (D) being obtained by reacting an epoxy resin with an amine compound.

5 . A coating method, the method 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

• C09D5/44

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

• C08G59/4028

  Isocyanates; Thioisocyanates · 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

• C09D163/00 Primary

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title