Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-12-20
2000-07-18
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524506, C08K 334
Patent
active
060908734
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a coating resin composition, a resin-coated article and a method for producing the same. In more detail, the invention relates to a coating resin composition which is used for coating the surface of a substrate, such as steels like stainless steel, non-ferrous metals like aluminum, inorganic building materials like concretes or slates, plastic substrates, woods, and the like, where the coating resin composition can be cured by being left at room temperature or by being subjected to a heat treatment, and which is capable of forming a coating film high in hardness and good at heat resistance and weatherability, and the invention also relates to a method for producing the same. And the invention also relates to a resin-coated article and a method for producing the same, which comprise cured resin layer of the coating resin composition on the surface of the substrate.
BACKGROUND ART
Coating agents obtained by hydrolyzing or partially hydrolyzing hydrolyzable organosilanes, or coating agents in which colloidal silica is mixed with such coating compositions have conventionally been known as coating agents for forming water-resistant coating films intended for the surface protection of steels like stainless steel, non-ferrous metals like aluminum, inorganic building materials such as concretes or slates, woods, plastic substrates, and the like.
For example, Japanese Patent Laid-Open Publications SHO 51-2736, SHO 51-2737, SHO 53-130732, and SHO 63-168470 have proposed coating agents composed of organoalkoxysilanes, hydrolyzates and/or partial condensates of the organoalkoxysilanes, and colloidal silica, in which alkoxy groups are converted to silanols by excess water. However, while coating films obtained from these coating agents are excellent for the use of substrate protection by virtue of their high hardness and good weatherability, they are poor in toughness and, in the case of coating films having a film thickness of 10 .mu.m or more, would easily develop cracks during heat curing process, in outdoor use, or at the eruption of abrupt temperature changes. Also, in the coating process, it is difficult to control the thickness of a coating film strictly below 10 .mu.m or less, such that the film thickness would be more likely to exceed 10 .mu.m on the coating surface or around the coating article or at recessed portions of the coating surface, thus likely causing production faults. In order to obtain desired coating film characteristics, the coating films obtained from these coating agents need to be subjected to a heat treatment at a high temperature of about 100.degree. C. or more or for a long time, such that the coating agents could not be used in some cases depending on the molding method or size of the substrate, or weatherability, or outdoor and other locations, inconveniently. Moreover, there has been an issue that these coating resin compositions are high in reactivity of silanol resulting from hydrolysis of alkoxysilane, so that their condensation reaction gradually proceeds even at room temperature, causing gelation to occur, with the result of poor stability. In particular, when it is attempted to derive a paint from these coating compositions as a vehicle of paint by adding pigments, the stability would be further deteriorated such that the coating resin compositions could not be formed into a paint, as a drawback.
As disclosed in Japanese Patent Laid-Open Publication SHO 64-168, a coating agent has also been proposed in which alkoxy groups are converted into silanols by adding water as a curing agent and a catalyst to partial hydrolyzates or partial condensates of alkoxysilane immediately before the coating process. This coating agent, however, is also so poor in toughness that cracks would easily develop with the film thickness of 10 .mu.m or more. While this coating agent is stable in preservation and keeps relatively stable even if formed into a paint with pigments added, it is necessary for obtaining desired coating film characteristi
REFERENCES:
patent: 4786660 (1988-11-01), Ittmann et al.
patent: 4895887 (1990-01-01), Daimon et al.
patent: 5753733 (1998-05-01), Eck et al.
Haruna Motoaki
Inoue Minoru
Iwabuchi Yasuyo
Okibe Junko
Sato Norio
Henderson Christopher
Matsushita Electric & Works Ltd.
Toshiba Silicone Co. Ltd.
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