# US 2014/0151230 A1 · Coating composition and method for forming coating film using same

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- Number: US 2014/0151230 A1
- Document ID: US20140151230A1
- Status: Published application
- Kind: A1
- Application number: 14/131,999
- Filed: 2012-06-28
- Published: 2014-06-05
- Earliest claimed: 2011-07-13
- Assignees: Nissan Motor Co., Ltd.
- Inventors: Takeshi Aiba; Takeshi Nomoto; Fumiaki Nakao
- Web page: https://patentgrep.com/patent/US20140151230A1

## CPC

- C09D 5/4473: {Mixture of polymers}
- C08G 18/643: {Reaction products of epoxy resins with at least equivalent amounts of amines}
- C08G 18/8019: {Masked aromatic polyisocyanates}
- C08G 59/4028: {Isocyanates; Thioisocyanates}
- C09D 5/443: {Polyepoxides}
- C09D 5/4457: {containing special additives, e.g. pigments, polymeric particles}
- C09D 175/04: Polyurethanes
- C08G 2150/90: Compositions for anticorrosive coatings
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A cationic electrodeposition coating is provided having excellent covering power (clearance application properties), edge anticorrosion properties, and finish properties. The cationic electrodeposition coating composition comprises a specific amino-group-containing epoxy resin; blocked polyisocyanate obtained by reacting an active hydrogen-containing component containing propylene glycol, and a polyisocyanate compound; and 0.1-20 mass parts of a cationic electrodepositing gelled microparticulate polymer obtained by crosslinking an acrylic copolymer containing hydrolyzable alkoxysilane groups and cationic groups, per a total of 100 mass parts of the solids fraction of the amino-group-containing epoxy resin and the blocked polyisocyanate compound.

## Claims

### Claim 1

A cationic electrodeposition paint composition comprising:
an amino group-containing epoxy resin;
a blocked polyisocyanate obtained by reacting a polyisocyanate compound and an active hydrogen-containing component containing propylene glycol; and
a cationic electrodepositing gelled microparticulate polymer, wherein:
the amino group-containing epoxy resin is a polyol-modified amino group-containing epoxy resin obtained by reacting a polycaprolactone polyol compound and an amino group-containing compound with a modified epoxy resin,
the modified epoxy resin is obtained by adding caprolactone to a hydroxyl group-containing epoxy resin,
the cationic electrodepositing gelled microparticulate polymer is obtained by crosslinking an acrylic copolymer containing a hydrolyzable alkoxysilane group and a cationic group; and
a blending ratio of the cationic electrodepositing gelled microparticulate polymer in the cationic electrodeposition paint composition is, in terms of a solid content ratio, from 0.1 to 20 parts by mass relative to total 100 parts by mass of the amino group-containing epoxy resin and the blocked polyisocyanate compound.

### Claim 2 (depends on 1)

The cationic electrodeposition paint composition according to claim 1, wherein an organic solvent amount in a cationic electrodeposition paint composition bath is from 1.4 to 2.3% by mass.

### Claim 3 (depends on 1)

The cationic electrodeposition paint composition according to claim 1, wherein:
a dry film thickness is denoted by M1 when electrodeposition coating is performed using a bath of the cationic electrodeposition paint composition under conditions of a bath temperature of 28° C., an applied voltage of 200 V and a time of 3 minutes, and
a dry film thickness is denoted by M2 when electrodeposition coating is performed using the bath of the cationic electrodeposition paint composition under conditions of the bath temperature of 40° C., the applied voltage of 200 V and the time of 3 minutes, and
a film thickness difference between the dry film thickness M2 and the dry film thickness M1 is 15 μm or less.

### Claim 4 (depends on 1)

A coated article obtained by electrodeposition coating using a bath of the cationic electrodeposition paint composition according to claim 1.

### Claim 5 (depends on 1)

A method for forming a cationic electrodeposition coating film, comprising the steps of:
immersing an object to be coated in an electrodeposition bath including the cationic electrodeposition paint composition according to claim 1; and
supplying power using the object to be coated as a cathode.

### Claim 6 (depends on 5)

A coated article for which a coating film is formed by the method according to claim 5.