# US 2014/0197039 A1 · Electrodeposition coating composition

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- Number: US 2014/0197039 A1
- Document ID: US20140197039A1
- Status: Published application
- Kind: A1
- Application number: 14/343,141
- Filed: 2012-09-06
- Published: 2014-07-17
- Earliest claimed: 2011-09-07
- Assignees: Nippon Paint Co., Ltd.
- Inventors: Toshio Inbe; Yohei Yoshimi; Ryuji Ishikawa
- Web page: https://patentgrep.com/patent/US20140197039A1

## CPC

- C09D 7/61: inorganic
- C08G 18/58: Epoxy resins {(C08G18/42, C08G18/48 take precedence; reaction products of epoxy resins with at least equivalent amounts of compounds containing active hydrogen C08G18/6407, with at least equivalent amounts of amines C08G18/6415; polymeric products of isocyanates or isothiocyanates with epoxy compounds having no active hydrogen C08G18/003)}
- C08G 18/8074: {Lactams}
- C08G 18/8077: {Oximes}
- C09D 5/084: {Inorganic compounds}
- C09D 5/44: for electrophoretic applications (processes for coating by electrophoresis C25D13/00)
- C09D 5/4438: {Binder based on epoxy/amine adducts, i.e. reaction products of polyepoxides with compounds containing amino groups only}
- C09D 5/4465: {Polyurethanes}
- C09D 5/448: {characterised by the additives used (C09D5/4403 - C09D5/4476, C09D5/4492 take precedence)}
- C09D 175/04: Polyurethanes
- C25D 9/02: with organic materials
- C25D 13/04: with organic material
- C25D 13/20: Pretreatment
- C25D 13/22: Servicing or operating {apparatus or multistep processes}
- 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
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

According to the present invention, provided is an electrodeposition coating composition, which can form an electrodeposition coating film having excellent corrosion resistance and coating film smoothness. The present invention relates to an electrodeposition coating composition comprising a soluble metal compound (A), amine-modified resin (B) and curing agent (C), wherein the resin (B) has an average molecular weight of 1,000 to 5,000, an amine value of 20 to 100 mgKOH/g and a hydroxyl value of 50 to 400 mgKOH/g, a theoretical residual hydroxyl value when the resin (B) and curing agent are reacted in an electrodeposition coating film is from 30 to 350 mgKOH/g, and the ratio (R) of the concentration of the theoretical residual hydroxyl value to the concentration of the compound (A) in the composition, based on the total of the solid content of the resin (B) and the curing agent in the composition satisfies the relationship (4,000<R<400,000).

## Claims

### Claim 1

An electrodeposition coating composition comprising a soluble metal compound (A) containing at least one metal selected from the group consisting of Ti, Bi, Zn, Y, Nd, La and Zr, an amine-modified resin (B) and a curing agent (C),
wherein the amine-modified resin (B) has a number average molecular weight of 1,000 to 5,000, an amine value of 20 to 100 mgKOH/g and a hydroxyl value of 50 to 400 mgKOH/g,
the curing agent (C) is a blocked isocyanate curing agent,
a theoretical residual hydroxyl value when the amine-modified resin (B) and the blocked isocyanate curing agent are reacted in an electrodeposition coating film during thermal curing is within the range of 20 to 350 mgKOH/g, and
a ratio (R) represented by the following formula:
R
=
(
TH
)
[
(
A
)
/
(
B
+
C
)
]
wherein TH is theoretical residual hydroxyl value [mgKOH/g] and the [(A)/(B+C)] is the concentration in metal element conversion of the soluble metal compound (A) in the electrodeposition coating composition [% by mass], based on the total of a solid concentration [% by mass] of the amine-modified resin (B) and a solid concentration [% by mass] of the blocked isocyanate curing agent in the electrodeposition coating composition,
is greater than 4,000 and smaller than 400,000 (4,000<R<400,000).

### Claim 2 (depends on 1)

The electrodeposition coating composition according to claim 1 further comprising nitric acid or a metal salt of nitrous acid (D).

### Claim 3 (depends on 1)

The electrodeposition coating composition according to claim 1 further comprising a plasticizer.

### Claim 4 (depends on 1)

The electrodeposition coating composition according to claim 1 further comprising at least one chelating acid (E) selected from the group consisting of sulfonic acid, organic phosphonic acid, organic carboxylic acid, amino acid, aminocarboxylic acid, sugar acid and carboxyl group-containing vinyl resin.

### Claim 5 (depends on 1)

The electrodeposition coating composition according to claim 1 further comprising an aminosilane compound (F).

### Claim 6 (depends on 1)

The electrodeposition coating composition according to claim 1, wherein the soluble metal compound (A) is a zinc compound, and wherein the zinc compound is a zinc phosphate having a volume average particle diameter D50 of not more than 3 μm dispersed with a cationic dispersant and the cationic dispersant is an aminosilane compound.

### Claim 7 (depends on 1)

The electrodeposition coating composition according to claim 1 further comprising an aluminum complex (G).

### Claim 8 (depends on 1)

The electrodeposition coating composition according to claim 1, wherein the soluble metal compound (A) has a solid content of 0.001 to 1% by mass in metal element conversion, based on the electrodeposition coating composition,
the nitric acid or the metal salt of nitrous acid (D) has a content of 0.001 to 1% by mass, based on the electrodeposition coating composition, and
the electrodeposition coating composition has a resin solid content of 1 to 30% by mass.

### Claim 9 (depends on 1)

A process for forming an electrodeposition coating film on an article to be coated having a Zr-based chemical conversion coating film comprising the steps of:
electrodeposition coating the electrodeposition coating composition according to claim 1 on an article to be coated having a chemical conversion coating film formed by a Zr-based chemical conversion composition to form an electrodeposition coating film, and
thermally curing the electrodeposition coating film to form a cured electrodeposition coating film.