Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1999-09-03
2000-11-07
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528272, 525437, C08F 2000
Patent
active
061438405
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polyester resin composition useful as a paint and the like, which exhibit excellent resistance to hydrolysis, resistance to alkali and resistance to cissing, a cured resin, and a paint.
BACKGROUND ART
Polyester resins are produced by means of an esterification reaction and/or a transesterification reaction of a polybasic acid and a polyhydric alcohol, in the presence of an animal or vegetable oil fatty acid, or an animal or vegetable oil, if necessary, and are widely employed for various uses such as a paint and the like.
Hitherto, known examples of a polyhydric alcohol for preparing a polyester resin include dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, neopentylglycol, and the like; trihydric alcohols such as glycerin, trimethylolethane, trimethylolpropane, and the like; and tetrahydric alcohols such as pentaerytritol, and the like.
A paint film formed of a polyester resin which starting material components include the aforementioned polyhydric alcohol possesses a problem with regard to their resistance to both hydrolysis and alkali, which in turn limits their use.
In addition, EP545108A discloses an alkyd resin consisting of a polyester comprising a diol which possesses an alkyl group having two or more carbon atoms in a side chain, and a melamine resin. However, the aforementioned publication does not include a concrete disclosure of a composition consisting of a polyester comprising 2,4-dialkyl-1,5-pentanediol, and a melamine resin.
Additionally, in the case of using a conventional polyester resin composition derived from a polyhydric alcohol as a paint, a defect in the paint film, caused by contaminants which exist in the painting environment, i.e., cissing tends to occur, and thus results in problems with the finish.
DISCLOSURE OF THE INVENTION
The present invention provides a resin composition containing a polyester resin possessing, within its molecular structure, a structural unit represented by the following formula (I) and an amino resin: ##STR2## [wherein, R.sup.1 and R.sup.2 are the same or different and each represents a hydrogen atom or lower alkyl, with the proviso that R.sup.1 and R.sup.2 do not simultaneously represent hydrogen atoms]. In addition, the present invention provides a cured resin, obtained by means of hardening the aforementioned resin composition, and a paint comprising the aforementioned resin composition.
In the resin composition according to the present invention, the polyester resin, which is reacted with an amino resin, possesses a structural unit of the aforementioned formula (I), within its molecular structure. In this manner, the resin composition according to the present invention provides a cured resin exhibiting an excellent resistance to hydrolysis, resistance to alkali and resistance to cissing, after a reaction between the polyester resin and the amino resin, and thus, is suitable for the use as a paint and the like.
BEST MODES FOR CARRYING OUT THE INVENTION
The resin composition according to the present invention contains a polyester resin and an amino resin, with the polyester resin possessing a structural unit of the aforementioned formula (I).
In the definition of the aforementioned formula (I), examples of the lower alkyl may include a linear or branched chain alkyl group having 1 to 8 carbon atoms such as methyl, ethyl propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isoamyl, neopentyl, 2-pentyl, 3-pentyl, hexyl, heptyl, octyl, and the like.
The polyester resin, a composition component of the resin composition according to the present invention, can be produced according to a conventional method, in which an esterification reaction is conducted using a polybasic acid and 2,4-dialkyl-1,5-pentanediol, the component which provides a structural unit represented by the formula (I). The structural unit in the polyester resin, represented by the formula (I), is formed by means of
Fujitani Ryoichi
Murata Shigeru
Yamauchi Toshio
Acquah Samuel A.
Kyowa Yuka Co., Ltd.
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