Polyester-based aqueous coating composition

a technology of aqueous coating and polyester, which is applied in the direction of coatings, polyester coatings, paints for electrolysis applications, etc., can solve the problems of reduced stability of an emulsion of this type, insufficient water resistance of the resulting coating, and insufficient film forming ability and processability of coating the interior surface of cans

Inactive Publication Date: 2001-11-29
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, recently questions have been raised about bisphenol A, and effort has been directed to coating compositions in which bisphenol A does not elute.
However, the film forming ability and processability for coating the interior surface of cans is inadequate.
In addition, attempts to improve processability often result in reduction of the stability of an emulsion of this type.
However, the water resistance of the resulting coating was not satisfactory.
Howev

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation examples 2 to 8

[0037] The carboxyl-functional polyester resins (A-2) to (A-8) were prepared in the same manner as in Preparation Example 1, except that the formulation of polyester materials was charged as shown in Table 1. Table 1 also shows acid value and number average molecular weight of each polyester resin (A-2) to (A-8).

1 TABLE 1 Preparation Example 1 2 3 4 5 Polyester resin A-1 A-2 A-3 A-4 A-5 Terephthalic Acid 8.3 16.6 16.6 Isophthalic acid 91.3 49.8 99.6 74.7 41.5 Adipic acid 29.2 29.2 43.8 Trimellitic anhydride 9.7 19.4 19.4 9.7 9.7 Benzoic acid 6.1 Bishydroxyethyl 88.9 101.6 76.2 50.8 76.2 terephthalate Ethylene glycol 24.2 6.0 Neopentyl glycol 26 58.2 26 1,4-butandiol 13.5 Acid value 45 65 50 40 45 Number average 3000 2000 2500 3500 3000 molecular weight Preparation Example 6 7 8 Polyester resin A-6 A-7 A-8 Terephthalic acid 8.3 Isophthalic acid 66.4 91.3 58.1 Adipic acid 14.6 87.6 Trimellitic anhydride 19.4 9.7 9.7 Benzoic acid Bishydroxyethyl terephthalate 101.6 88.9 Ethylene glycol...

example 1

[0038] A reaction vessel was charged with the polyester resin (A-1) obtained in Preparation Example 1 and cooled until 1 50.degree. C. 50 parts of cyclohexanone per 100 parts of the resin was added and the mixture was cooled to 100.degree. C. When the temperature was 100.degree. C., 10 parts of "ECN1299"(manufactured by Asahi Kasei Epoxy Co., Ltd., creosol Novolac phenol epoxy resin) as a curing agent was added and the mixture was dissolved in uniformity. Subsequently, 5 parts of dimethylethanolamine was added, and the mixture was neutralized and diluted with 275 parts of deionized water to obtain a transparent or opaque white water dispersion having a solid content of 25 %. The water dispersion had good emulsion appearance without precipitating after the storage at 20.degree. C. for one month.

[0039] The resulting water dispersion was mixed with 0.25 parts of choline chloride as a curing catalyst and 10 parts of isopropanol a surfactant, followed by stirring to obtain an aqueous coa...

example 5

[0070] The flask was charged with the polyester resin (A-1) obtained in Preparation Example 1 and cooled until 150.degree. C. 50 parts of cyclohexanone per 100 parts of the resin was added and the mixture was cooled until 100.degree. C. When the temperature was 100.degree. C., 10 parts of "EHPE-3150, (manufactured by Daicel Chemical Industries, Ltd., alicyclic epoxy resin) as a curing agent was added and the mixture was dissolved in uniformity. Subsequently, 5 parts of dimethylethanolamine was added, and the mixture was neutralized and diluted with 275 parts of deionized water to obtain a transparent or opaque white water dispersion having a solid content of 25 %. The water dispersion had good emulsion appearance without precipitating after the storage at 40.degree. C. for one month.

[0071] The resulting water dispersion was mixed with 1 part of choline chloride as a curing catalyst and 10 parts of isopropanol a surfactant, followed by stirring to obtain an aqueous coating compositio...

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Abstract

Polyester-based aqueous coating compositions comprising a mixture of a carboxyl-functional polyester resin (A), a water-insoluble epoxy resin (B), and a hydrophobic solvent (C), the mixture being neutralized with neutralizer (D) and dispersed or dissolved in water. The compositions have excellent film forming and processing characteristics, and are particularly useful in coating the interior surface of cans and as automobile coatings.

Description

[0001] 1. Field of the Invention[0002] This invention relates to crosslinkable aqueous coating compositions which exhibit excellent film-forming and curing characteristics, in terms of processability and safety. The compositions can be used for coating the interior surfaces of cans. Moreover, these crosslinkable aqueous coating compositions are capable of forming films having excellent hardness, and accordingly can be used as primers or finish coats for automotive or industrial applications.[0003] 2. Description of the Prior Art[0004] In the past, aqueous coating compositions have been made from the reaction product of a high acid value acrylic resin and a high molecular weight bisphenol A based epoxy resin. These compositions have been used for coating the interior surface of cans. However, recently questions have been raised about bisphenol A, and effort has been directed to coating compositions in which bisphenol A does not elute.[0005] Polyester resins have previously been propo...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D167/00
CPCC09D163/00C09D167/00C08L63/00C08L2666/18
Inventor KITABATAKE, MICHIHARU
Owner KANSAI PAINT CO LTD
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