Pigment dispersion paste for electrodeposition coating compositions, and electrodeposition coating composition

• US 20090234048A1
• Filed: 03/13/2009
• Published: 09/17/2009
• Est. Priority Date: 03/14/2008
• Status: Abandoned Application

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Kato, Kiyoshi, Yoshikawa, Naoyuki
• Application Number:
  US12/382,337
• Publication Number:
  US 20090234048A1
• Time in Patent Office: Days
• US Class Current: 524/35
• CPC Class Codes: C09D 17/005 Carbon black
• 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: C09D 5/4473 Mixture of polymers
• CPC Class Codes: C09D 5/448 characterised by the additives used C09D5/4403 - C09D5/4476, C09D5/4492 take precedence

Abstract

The present invention provides a pigment dispersion paste with improved storage stability, and an electrodeposition coating composition that enables energy saving in electrodeposition coating equipment and a reduction in the amount of electrodeposition coating equipment.

The pigment dispersion paste of the present invention contains (i) a pigment-dispersing resin, (ii) a pigment component, (iii) a cellulose (A), (iv) a hydroxyalkyl imidazoline compound (B) and/or a compound (C), and (v) water;

the pigment dispersion paste containing, per 100 parts by mass of the solids of the pigment-dispersing resin, 0.1 to 1,000 parts by mass of the pigment component, 0.1 to 25 parts by mass of the cellulose (A), 0.1 to 5 parts by mass of a hydroxyalkyl imidazoline compound (B) and/or 0.1 to 5 parts by mass of a compound (C); and

the pigment dispersion paste having, when adjusted to a solids concentration of 40 mass %, an TI value of 1.8 to 4.0 as measured by the pigment test method of JIS K 5101-6-2:

wherein R¹ is a C_6-32 hydrocarbon group and R² is a C_2-6 alkylene group;

wherein n is an integer from 11 to 16.

Claims

1. A pigment dispersion paste for electrodeposition coating compositions, comprising (i) a pigment-dispersing resin, (ii) a pigment component, (iii) a cellulose (A), (iv) a hydroxyalkyl imidazoline compound (B) and/or a compound (C), and (v) water;

the pigment dispersion paste comprising, per 100 parts by mass of the solids of the pigment-dispersing resin, 0.1 to 1,000 parts by mass of the pigment component, 0.1 to 25 parts by mass of the cellulose (A), and 0.1 to 5 parts by mass of the hydroxyalkyl imidazoline compound (B) represented by Formula (1) and/or 0.1 to 5 parts by mass of the compound (C) represented by Formula (2); and

the pigment dispersion paste, when adjusted to a solids concentration of 40 mass %, having an TI value of 1.8 to 4.0 as measured by the pigment test method of JIS K 5101-6-2;

wherein R¹ is a C_6-32 hydrocarbon group and R² is a C_2-6 alkylene group;

wherein n is an integer from 11 to 16.

2. The pigment dispersion paste according to claim 1, wherein the pigment dispersion paste comprises, per 100 parts by mass of the solids of the pigment-dispersing resin, 0.1 to 1,000 parts by mass of the pigment component, 0.1 to 25 parts by mass of the cellulose (A), and 0.1 to 5 parts by mass of the hydroxyalkyl imidazoline compound (B) represented by Formula (1);

and wherein the pigment dispersion paste, when adjusted to a solids concentration of 40 mass %, has an TI value of 1.8 to 4.0 as measured by the pigment test method of JIS K 5101-6-2.

3. The pigment dispersion paste according to claim 1, wherein the pigment dispersion paste comprises, per 100 parts by mass of the solids of the pigment-dispersing resin, 0.1 to 1,000 parts by mass of the pigment component, 0.1 to 25 parts by mass of the cellulose (A), and 0.1 to 5 parts by mass of the compound (C) represented by Formula (2);

and wherein the pigment dispersion paste, when adjusted to a solids concentration of 40 mass %, has an TI value of 1.8 to 4.0 as measured by the pigment test method of JIS K 5101-6-2.

4. The pigment dispersion paste according to claim 1, wherein the pigment dispersion paste comprises, per 100 parts by mass of the solids of the pigment-dispersing resin, 0.1 to 1,000 parts by mass of the pigment component, 0.1 to 25 parts by mass of the cellulose (A), 0.1 to 5 parts by mass of the hydroxyalkyl imidazoline compound (B) represented by Formula (1), and 0.1 to 5 parts by mass of the compound (C) represented by Formula (2);

and wherein the pigment dispersion paste, when adjusted to a solids concentration of 40 mass %, has an TI value of 1.8 to 4.0 as measured by the pigment test method of JIS K 5101-6-2.

5. The pigment dispersion paste according to claim 1, wherein the cellulose (A) is a fine cellulose dispersion having a mean particle diameter of 0.01 to 6 μ

m.

6. The pigment dispersion paste according to claim 1, wherein the cellulose (A) is a cellulose composite dispersion (a) comprising a fine cellulose dispersion and a water-soluble gum and/or a hydrophilic substance.

7. The pigment dispersion paste according to claim 1, wherein, after storage at 40°

C. for 4 weeks, the pigment dispersion paste, when adjusted to a solids concentration of 40 mass %, has an TI value of 1.8 to 4.0 as measured by the pigment test method of JIS K 5101-6-2.

8. The pigment dispersion paste according to claim 1, wherein the increase in the TI value of the pigment dispersion paste after storage at 40°

C. for 4 weeks is 0.5 or less as compared with the TI value of the pigment dispersion paste before storage; and

wherein the TI values before and after storage at 40°

C. for 4 weeks are both within the range of 1.8 to 4.0.

9. The pigment dispersion paste according to claim 1, which has a solids content of 40 to 60 mass %.

10. The pigment dispersion paste according to claim 1, wherein particles present in the pigment dispersion paste have a mean particle diameter of 1 to 3,000 nm.

11. An electrodeposition coating composition comprising a base resin, a curing agent, and the pigment dispersion paste according to any one of claims 1 to 10 in an amount of 0.1 to 50 parts by mass on a solids basis per 100 parts by mass of the total solids content of the base resin and the curing agent.