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Jar coating composition

A composition and coating technology, which can be used in polyester coatings, coatings, devices for applying liquid to surfaces, etc., to solve problems such as insufficient film smoothness D&I processability

Inactive Publication Date: 2007-09-19
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such a can coating composition is used as a precoat, the smoothness of the coating film and the D&I processability may be insufficient.

Method used

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  • Jar coating composition
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Examples

Experimental program
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Effect test

manufacture example 1

[0119] The polybasic acid component is set to a raw material composition of terephthalic acid / isophthalic acid = 85 mol% / 15 mol%, and the polyol component is set to a raw material composition of 100 mol% ethylene glycol to obtain polyterephthalic acid. Ethylene glycol formate resin (PET), the obtained resin is cooled and pulverized with a jet mill by a conventional method, and repeatedly classified to obtain crystalline polyethylene terephthalate resin particles (called PET-No.1) .

manufacture example 2

[0121] Using the polyethylene terephthalate resin of the raw material composition shown in Table 1, the resin was mixed with "DBE" (trade name, manufactured by DuPont Company, dimethyl adipate, dimethyl glutarate, butyl Mixed solvent of dimethyl diacid, boiling point 205°C) 400 parts are heated and dissolved while being stirred together, 500 parts of cyclohexanone (boiling point 155°C) are added to cool and precipitate crystal fine particles, then filtered and dried under reduced pressure to obtain crystalline Polyethylene terephthalate resin microparticles (referred to as PET-No.2).

manufacture example 3

[0123] A crystalline polyethylene terephthalate was obtained in the same manner as in Production Example 2, except that polyethylene terephthalate having the raw material composition shown in Table 1 was changed to N-methyl-2-pyrrolidone (boiling point: 202° C.). Microparticles of ethylene terephthalate resin (referred to as PET-No.3).

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Abstract

The invention provides a coating composition for a kettle, the composition contains: (A) crystalline polyester resin particles using an ethylene terephthalate unit as a main component, (B) crystalline polyester resin particles using an butylene terephthalate unit as a main component, and (c) an organic solvent having a solubility of less than 5% by weight when being lower than 40 DEG C and more than 99% by weight when being higher than 180 DEG C, for the particles (A) and the particles (B), wherein proportions of the particles (A) and the particles (B) are based on a total of the two, the proportion of the particles (A) is 95-30% by weight and the proportion of the particles (B) is 5-70% by weight, the content of the organic solvent (C) is 50-500 parts relative to 100 parts of the total of the particles (A) and the particles (B) by weight.

Description

technical field [0001] This invention relates to can coating compositions. Background technique [0002] A coating film is usually formed on the inner surface and the outer surface of cans such as cans for food and beverages. Conventionally, epoxy resin / phenolic resin type coatings, epoxy resin / amino resin type coatings, etc. have been used as coating compositions for cans. But there is concern about the leaching of bisphenol A, which is suspected of being an environmental hormone. [0003] In recent years, from the viewpoint of cost reduction by shortening the process and elimination of environmental problems associated with molding oil treatment after forming, the post-coating method, in which the metal plate is formed into a can shape and then painted, has been changed to the A pre-coating method in which pre-coated sheet metal is formed into a can shape. In the case of the pre-coating method, drawing and thinning processability (twisting りしごき processability) (hereinaf...

Claims

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Application Information

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IPC IPC(8): C09D167/03B05D7/14B05D7/22
CPCB05D7/14C08K5/521C08L61/06C08L63/00C08L67/03C09D7/20C09D7/63C09D7/65C09D167/03
Inventor 增田秀树天木慎悟坂本明久田村孝一吉原秀树
Owner KANSAI PAINT CO LTD
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