Stock material or miscellaneous articles – Composite – Of polyester
Patent
1997-06-10
2000-08-15
Dudash, Diana
Stock material or miscellaneous articles
Composite
Of polyester
427387, 4273882, 4274071, 4274195, 428412, 428413, 428419, 4284231, 428446, 525206, 525208, 525209, 525212, 525217, 525220, 525221, 525223, 525437, 525438, 525440, 525446, 528 25, 528 26, 528 27, 528 28, B32B 2718, B32B 2700, B05D 136, C08L 3314
Patent
active
061033871
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a novel thermosetting composition, a method of coating and a coated article. More particularly, it relates a thermosetting composition comprising a ceramic ingredient, which gives a cured product having excellent stain resistance, stain-removing property, weathering resistance, light resistance, chemical resistance, moisture resistance and appearance and is excellent in environment protection property and safety, a method of coating and a coated article.
BACKGROUND TECHNOLOGY
It is generally known that thermosetting compositions are prepared from compounds having carboxyl groups and compounds having reactive functional groups which can form chemical bonds with the carboxyl groups by heating, such as epoxy group, oxazoline group, silanol group, alkoxysilane group, hydroxyl group, amino group, imino group, isocyanate group, blocked isocyanate group, cyclocarobonate group, vinyl ether group, vinyl thioether group, aminomethylol group, alkylated aminomethylol group, acetal group and ketal group.
As the thermosetting compositions described above, for example, compositions comprising combination of carboxyl groups and epoxy groups have been disclosed in Laid Open Japanese Patent Application Showa 51-114429, Laid Open European Patent Application 29595 and U.S. Pat. Nos. 4,371,667, 4,650,718, 4,681,811, 4,703,101 and 4,764,430.
The compositions comprising combination of carboxyl groups and oxazoline groups have been disclosed in U.S. Pat. No. 3,505,297 and Laid Open Japanese Patent Applications Showa 60-88038 and Heisei 2-115238.
The thermosetting compositions give cured products having excellent chemical properties, physical properties and weathering resistance and are widely utilized in the field of coatings, ink, adhesives and molded articles.
However, the reactivity between the carboxyl group and the reactive functional groups is high so that compositions in which compounds having carboxyl groups and compounds having the reactive functional groups exist together have problems that the compositions are gelled during storage and the period suitable for pot life is short.
The compounds comprising carboxyl groups conventionally utilized for thermosetting compositions described above have problems that solubility to generally used organic solvents is low and that compatibility to the compounds having reactive groups, which react with the carboxyl group, is inferior because of the property of the carboxyl group capable of forming strong hydrogen bonds. When the thermosetting compositions are utilized as top coating compositions, there are naturally have problems that preparation of coating composition of high solid content is difficult and that appearance of the finished coat is inferior.
For the purpose of solving these problems, it was proposed that carboxyl group was blocked by converting it to tertiary-butyl ester and the ester was decomposed by heating, and the free carboxyl group was regenerated by elimination of isobutene (Laid Open Japanese Patent Application Heisei 1-104646).
However, this method is not sufficiently satisfactory in view of resource saving and energy saving because of the requirement of a high temperature, such as 170-200.degree. C., for the heat decomposition of the tertiary-butyl ester. And also, this method is not sufficiently satisfactory because of the problem that pock marks which were made by foaming and degassing of isobutene formed by the decomposition remained on the cured surface of the coating.
In recent years, many oil droplets and dusts have existed in air by environmental changes such as air pollution. As the result, some problems have occurred, among which paint film on buildings, automobiles and the like are easier to be stained than former and it's stain is difficult to remove. Thus, it has been desired that paint films have resistance to the stain, i.e. stain resistance and property to remove stain from stained paint films, i.e. stain-removing property. In such circumstances, it is desired to produce coating composit
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Ishidoya Masahiro
Komoto Keiji
Mizutani Hiroki
Sano Masahiro
Yamamoto Toshio
Dudash Diana
NOF Corporation
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