Powder coating composition containing low temperature curable epoxy resin

• US 20030130441A1
• Filed: 12/18/2002
• Published: 07/10/2003
• Est. Priority Date: 12/19/2001
• Status: Active Grant

• Current Assignee: KUKDO CHEMICAL Co., Ltd.
• Original Assignee: KUKDO CHEMICAL Co., Ltd.
• Inventors: Kim, Jinwoo, Park, Chongsoo, Park, Youngsoo
• Granted Patent: US 6,890,974 B2
• Time in Patent Office: Days
• US Class Current: 525/523
• CPC Class Codes: C08G 59/3218 Carbocyclic compounds
• CPC Class Codes: C09D 163/00 Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins

Abstract

The present invention relates to a powder coating composition containing a low temperature curable epoxy resin, and more particularly to a powder coating composition containing a low temperature curable epoxy resin, which can be readily cured at a low temperature, thereby capable of being applied to coating objects that are noneconomical in terms of workability at an elevated temperature, or are thermally sensitive. The present invention provides a powder coating composition comprising 100 parts by weight of a low temperature curable epoxy resin; 30 to 500 parts by weight of curing.

Claims

1. A powder coating composition, comprising:

100 parts by weight of a low temperature curable epoxy resin, represented by formula 1 below;

 

wherein n is a real number of from 0.1 to 30;

R₁ and R₂ are, independently, a hydrogen, or an unsubstituted or substituted alkyl or alkoxy group having from 1 to 5 carbon atoms; and

X is a hydrogen atom or a glycidyl group, wherein more than 20% of X are glycidyl groups; and

30 to 500 parts by weight of a curing agent.

2. The powder coating composition as set forth in claim 1, wherein the epoxy resin is represented by formula 4 below:

3. The powder coating composition as set forth in claim 1, wherein R₁ and R₂ are all methyl, and n is a real number of 1˜

15.

4. The powder coating composition as set forth in claim 1, which comprises 0.1 to 20 parts by weight of a defoaming agent and 0.1 to 20 parts by weight of a leveling agent.

5. The powder coating composition as set forth in claim 1, wherein the curing agent is a phenolic curing agent or a polyester-based curing agent.

6. The powder coating composition as set forth in claim 1, which comprises 10 to 200 parts by weight of a universal bisphenol-A epoxy resin for powder coatings having an epoxy equivalent weight of 600 to 1500 g/eq, based on 100 parts by weight of the low temperature curable epoxy resin represented by formula 1.

7. The powder coating composition as set forth in claim 1, which further comprises at least one additive selected from the group consisting of a pigment, an antioxidant, a filler, a light stabilizer, a curing promoter and an ultraviolet absorber.