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
1995-06-05
1996-12-24
Szekely, Peter A.
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...
523205, 524512, 524516, 525 66, 525160, 525164, 525285, 525303, 428201, 428203, 428204, 428206, 428207, 428208, 428502, 428520, 428522, C08L 5100, C08L 6128, C08L 3308, C08L 2328
Patent
active
055874185
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns a thermosetting coating composition. More specifically, it concerns a coating composition which is a colour substrate fit for polypropylene base such as a super high-strength polypropylene bumper substrate, etc. and which is capable of providing the base material with excellent adhesion especially through two times coating one time baking called "wet on wet system", made without primer by using this colour base and top clear coat and 1 bake (wet-on-wet system) and which is also capable of forming thermosetting coated film having long-term weatherability, chemical resistance, waterproofing and highly glossy and vivid coated film appearance.
BACKGROUND ART
Conventional coloured base coat for car body, which are generally made of polyester, melamine, cellulose acetate butyrate resin ("CAB resin") or acrylic melamine resin, hardly have any adhesion to polyolefinic substrates consisting of so-called crystalline polyolefins with low polarity.
For that reason, paints containing modified or copolymerized chlorinated polyolefin containing anhydride are used as colored base coat for the coating on polyolefinic substrates. Though they all have good adhesion to such substrates, these paints are used only for primer coating or 1-coat top coating because of such problems as no hardening, poor adhesion or poor secondary adhesion after washing with water, etc., which are vital problems for coating materials, in the coating made by the method of directly coating a colour base having painting pigment and completing the coating with a single baking, i.e. primerless 2-coat 1-bake system (wet on wet system of coloured base coat and top clear coat).
Moreover, the paints containing modified or copolymerized chlorinated polyolefin containing anhydride which are supplied today are mostly of lacquer type or urethane crosslinking with polyisocyanate and of short working life and, therefore, it was practically very difficult to use them by the primerless 2-coat, 1-bake method.
Furthermore, the coated film obtained had a defect of yellowing regarding long-term weatherability and problems such as poor waterproofing, poor chemical resistance, etc. More specifically, they had a problem of producing dechlorination from polyolefinic substrate and modified chlorinated polyolefin containing anhydride, causing yellowing of aluminium pigment and top coat clear, etc.
As attempts for improving the polyolefinic substrate itself, various trials are being made such as plasma treatment (surface oxidation by oxygen plasma), frame treatment (surface oxidation by frame), ultraviolet ray treatment (furnishing of functionality by ultraviolet ray), etc. as measures for removing trichloroethane (improvement of adhesion. However, those measures also have problems such as unstable adhesion, etc. depending on the kind of polyolefinic substrate (degree of non polarity) and still remain in the stage of study. Moreover, while it is possible to improve adhesion by introducing functional group into the polyolefinic substrate, it makes the substrate costly.
Because of such defects, said formation of coated film is still insufficient in commercial value and has therefore not yet put to practical use. For that reason, the present invention intends to provide a thermosetting coating composition provided with workability, excellent adhesion, weatherability, good appearance, etc. capable of primerless coloured base coat and top clear coat by a 2-coat, 1-bake method on the polyolefinic substrates. Moreover, the present invention intends to provide a coated body having excellent adhesion, weatherability, good appearance, etc. realized by a 2-coat, 1-bake method.
DISCLOSURE OF THE INVENTION
In view of the current situation described above, the inventors of the present application assiduously made studies to solve said defects and found that formation of coated film by primerless 2-coat, 1-bake method furnishing polyolefinic substrates with adhesion can be achieved properly by dispersing the pigment in the paint with mel
Ina Toshiro
Sasaki Ryo
Nissan Motor Co. Ltd
Szekely Peter A.
TBL Co., Ltd.
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