CATIONIC ELECTRODEPOSITION COATING COMPOSITION

• US 20110024298A1
• Filed: 07/29/2010
• Published: 02/03/2011
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: SHIMASAKI, Akihiko, NISHIGUCHI, Shigeo
• Granted Patent: US 8,097,664 B2
• Time in Patent Office: Days
• US Class Current: 205/50
• CPC Class Codes: C08G 18/643 Reaction products of epoxy resins with at least equivalent amounts of amines
• CPC Class Codes: C08G 18/8064 with monohydroxy compounds
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 5/4438 Binder based on epoxy/amine adducts, i.e. reaction products of polyepoxides with compounds containing amino groups only
• CPC Class Codes: C25D 13/04 with organic material
• CPC Class Codes: C25D 9/10 on iron or steel
• CPC Class Codes: Y10T 428/31529 Next to metal

Abstract

Object: To provide a coated article having excellent anti-corrosion properties on untreated steel sheets.

Means for Achieving the Object: The present invention provides a cationic electrodeposition coating composition including amino group-containing modified epoxy resin (A), blocked polyisocyanate curing agent (B), phenol resin (C), metal compound (D), and nitrogen oxide ion (E), wherein the metal compound (D) is contained in an amount of 10 to 10,000 ppm calculated as metal and the nitrogen oxide ion (E) is contained in an amount of 50 to 10,000 ppm, relative to the mass of the cationic electrodeposition coating composition.

Claims

1. A cationic electrodeposition coating composition comprising amino group-containing modified epoxy resin (A), blocked polyisocyanate curing agent (B), phenol resin (C), metal compound (D), and nitrogen oxide ion (E);

the cationic electrodeposition coating composition comprising the metal compound (D) in an amount of 10 to 10,000 ppm calculated as metal (on a metal mass basis) and the nitrogen oxide ion (E) in an amount of 50 to 10,000 ppm, relative to the mass of the cationic electrodeposition coating composition,

the amino group-containing modified epoxy resin (A) being a resin obtainable by reacting modified epoxy resin (A1) having an epoxy equivalent of 500 to 2,500 and amine compound (A2),

the modified epoxy resin (A1) being obtainable by reacting diepoxy compound (a1), epoxy resin (a2) having an epoxy equivalent of 170 to 500, and bisphenol compound (a3),

the diepoxy compound (a1) being compound (1) represented by Formula (1) below,

2. The cationic electrodeposition coating composition according to claim 1, wherein the amino group-containing modified epoxy resin (A) is contained in an amount of 30 to 75 parts by mass, the blocked polyisocyanate curing agent (B) is contained in an amount of 10 to 40 parts by mass, and the phenol resin (C) is contained in an amount of 3 to 35 parts by mass, based on the total solids mass (100 parts by mass) of the amino group-containing modified epoxy resin (A), blocked polyisocyanate curing agent (B), and phenol resin (C).

3. The cationic electrodeposition coating composition according to claim 1, wherein the modified epoxy resin (A1) is obtainable by reacting 1 to 35 mass % of the diepoxy compound (a1), 10 to 80 mass % of the epoxy resin (a2), and 10 to 60 mass % of the bisphenol compound (a3), based on the total solids mass of the diepoxy compound (a1), epoxy resin (a2), and bisphenol compound (a3).

4. The cationic electrodeposition coating composition according to claim 1, wherein R¹ in the Formula (1) or R³ in the Formula (2) is a methyl group or hydrogen atom.

5. The cationic electrodeposition coating composition according to claim 1, wherein the metal compound (D) consists of a zirconium compound, or comprises at least one compound selected from the group consisting of zirconium compounds and titanium compounds, and a compound of at least one metal selected from the group consisting of cobalt, vanadium, tungsten, molybdenum, copper, indium, zinc, aluminum, bismuth, yttrium, lanthanoids, alkali metals, and alkaline earth metals.

6. The cationic electrodeposition coating composition according to claim 1, wherein the solids content of the cationic electrodeposition coating composition is 5 to 40 mass %.

7. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 1, and performing electrodeposition coating.

8. The cationic electrodeposition coating composition according to claim 2, wherein the modified epoxy resin (A1) is obtainable by reacting 1 to 35 mass % of the diepoxy compound (a1), 10 to 80 mass % of the epoxy resin (a2), and 10 to 60 mass % of the bisphenol compound (a3), based on the total solids mass of the diepoxy compound (a1), epoxy resin (a2), and bisphenol compound (a3).

9. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 2, and performing electrodeposition coating.

10. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 3, and performing electrodeposition coating.

11. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 4, and performing electrodeposition coating.

12. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 5, and performing electrodeposition coating.

13. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 6, and performing electrodeposition coating.

14. A coated article obtainable by immersing a metal substrate in an electrodeposition coating composition bath containing the cationic electrodeposition coating composition according to claim 8, and performing electrodeposition coating.