Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1996-11-14
1998-07-14
Berman, Susan W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 96, 522 97, 522101, 522103, 522104, 522105, 522107, 522142, C08J 328, C08L 6120, C08L 6708
Patent
active
057805261
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an ultraviolet-curing liquid undercoating composition for metallizing FRP which is of the one-component type and therefore without pot life restriction, and has excellent adhesion and heat resistance characteristics, a coating method using the undercoating composition, and an automotive reflector as coated by the method.
BACKGROUND TECHNOLOGY
Fiber-reinforced plastics (hereinafter referred to briefly as FRP) are not only light-weight but also highly resistant to corrosion and impact and, therefore, find application in a broad spectrum of uses including automotive reflectors. An automotive reflector, for instance, is manufactured by molding an FRP to the required shape and depositing an aluminum or other metal on the surface of the molding by the vapor deposition technique. However, when a metal such as aluminum is directly vapor-deposited on an FRP article, the brilliance of the metal is sacrificed so that the optical characteristics required of a reflector are hardly obtained. To improve the optical characteristics, therefore, it is by now a common practice to apply an under coat to the surface of the article and allow the coat to cure before the metal vapor deposition step.
As the under coat for such purposes, lacquers using acrylic resin or nitrocellulose, urethane resin coatings, alkyd resin coatings, and ultraviolet radiation (UV)-curing coatings are known. Among them, UV-curing coatings cure in a very short time and are advantageous in terms of productivity and space saving, thus being preferred as FRP under coats.
As such a UV-curing coating, Japanese Patent Application Hei-5-168048 proposes a composition comprising a compound containing a plurality of (meth)acryloyl groups per molecule, such as dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, or the like, and an isocyanurate-type polyisocyanate. In another UV-curing coating system, the technology comprising addition of a silane coupling agent for insuring a necessary film performance has been proposed. However, since these coatings are invariably of the two-component type, the problem of a limited pot life was inevitable. Moreover, they were not as satisfactory as desired in the aspect of heat resistance.
With having been developed in the above state of the art, the present invention has for its object to provide an UV-curing liquid undercoating composition for metallizing FRP, which is of the one-component type, thus being free from the problem of a limited pot life, and insures sufficiently high adhesion and heat resistance.
DISCLOSURE OF THE INVENTION
The present invention essentially resides in an UV-curing liquid undercoating composition for metallizing FRP, which comprises 20 to 80 parts by weight of a compound(s) containing at least two (meth)acryloyl groups per molecule, 80 to 20 parts by weight of oil-modified alkyd resin(s), and 2 to 15 parts by weight of a sensitizer, optionally supplemented with 5 to 20 parts by weight of amino resin based on a combined total of 100 parts by weight of said compound(s) containing at least two (meth)acryloyl groups per molecule and said oil-modified alkyd resin(s).
In another aspect, the present invention is concerned with a coating method using said UV-curing liquid undercoating composition for metallizing FRP and an automotive reflector as coated by said method.
The present invention is now described in detail.
The UV-curing liquid undercoating composition for metallizing FRP according to the present invention (hereinafter referred to sometimes as the composition of the invention) essentially comprises a compound(s) containing at least two (meth)acryloyl groups per molecule, oil-modified alkyd resin(s), and a sensitizer.
The first component of the composition of the present invention is compound(s) containing at least two (meth)acryloyl groups per molecule.
In accordance with the present invention, this compound(s) containing at least two (meth)acryloyl groups polymerizes and cures under the aid of said sensitizer upon exposure to u
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Konse Hiroaki
Kudo Shizuo
Matsui Sakae
Nakamura Hiroyuki
Berman Susan W.
Nippon Paint Co. Ltd.
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