Two-package curing type polyurethane coating composition and coated article

• US 20050123770A1
• Filed: 11/04/2004
• Published: 06/09/2005
• Est. Priority Date: 11/05/2003
• Status: Active Grant

• Current Assignee: Nippon paint automotive coatings co., ltd. (Rainbow Light Limited), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Nippon Bee Chemical Co. Ltd., Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nakano, Yasuhiro, Yoshida, Hirokazu, Kawazu, Kenji, Kai, Mika
• Granted Patent: US 7,351,476 B2
• Time in Patent Office: Days
• US Class Current: 428/423.100
• CPC Class Codes: C08G 18/62 Polymers of compounds having carbon-to-carbon double bonds
• CPC Class Codes: C08L 2666/20 Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

The present invention aims to give a two package curing type polyurethane coating composition which can form a film having soft, wet and dry feelings simultaneously and which maintain general properties of a coating composition such as the designing property, film strength, resistance to scratching, discoloration resistance, pot life, resistance to stains with fats and oils, and the like and to provide a coated article with such a two package curing type polyurethane coating composition. A two package curing type polyurethane coating composition comprising a resin solution containing an acrylic polyol and a curing agent solution containing a polyisocyanate, wherein the resin solution contains urethane resin beads (A) in the amount of 25 to 50 parts by weight and an organic matting agent (B) in the amount of 3 to 10 parts by weight and contains the urethane resin beads (A) and the organic matting agent (B) in total of 30 parts by weight or more, respectively, to 100 parts by weight of solid contents of the resin solution, and the acrylic polyol and the polyisocyanate have OH group/NCO group (equivalent ratio) in the range of (4.5/1) to (1.5/1).

Claims

1. A two package curing type polyurethane coating composition comprising a resin solution containing an acrylic polyol and a curing agent solution containing a polyisocyanate,

wherein the resin solution contains urethane resin beads (A) in the amount of 25 to 50 parts by weight and an organic matting agent (B) in the amount of 3 to 10 parts by weight and

contains said urethane resin beads (A) and said organic matting agent (B) in total of 30 parts by weight or more, respectively, to 100 parts by weight of solid contents of the resin solution, and

said acrylic polyol and said polyisocyanate have OH group/NCO group (equivalent ratio) in the range of (4.5/1) to (1.5/1).

2. The two package curing type polyurethane coating composition according to claim 1,

wherein the acrylic polyol has a glass transition temperature (Tg) of −

10°

C. or lower.

3. The two package curing type polyurethane coating composition according to claim 1 or 2,

wherein the organic matting agent (B) is a grounded silk powder product.

4. The two package curing type polyurethane coating composition according to any one of claims 1, 2, and 3,

wherein the resin solution contains an organotin curing catalyst in the amount of 0 to 0.05 part by weight to 100 parts by weight of the solid contents of the resin solution.

5. A coated article having a film on the surface, wherein said film is formed using the two package curing type polyurethane coating composition according to any one of the claims 1, 2, and 4.