Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-05-17
1994-10-11
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 94, 524 99, 524103, 524291, 524401, 524418, 524427, 524433, 524437, 524451, C08K 534, C08K 326, C08K 318, C08K 322
Patent
active
053547950
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a polypropylene resin composition having an excellent coating property after a plasma treatment, and an excellent weathering resistance, which is especially useful for a bumper.
2. Description of the Related Art
A polypropylene resin is widely utilized for automobile parts and various industrial parts, due to its excellent chemical properties, physical properties and moldability, and further, its light weight and relatively low cost. In particular, the use thereof for automobile bumpers is now widespread.
In general, automobile bumpers were used without a coating or when entirely coated, but a partially coated product, i.e., having a portion uncoated, has become popular from the viewpoint of the design demands, and accordingly, a weathering resistance in addition to an excellent coating property is now required of the polypropylene resin.
In general, a bumper made of a polypropylene resin was coated by the following method. Specifically, the surface of the bumper was washed with a halogenbased organic solvent and given a primer coating, and then a top coating was applied over the primer coating.
Currently, to reduce costs and improve productivity, a method is now widely used which comprises washing the surface of a bumper with a halogen-based organic solvent and subjecting the surface of the washed bumper to a plasma treatment, instead of applying the primer coating, and then applying a top coating over the plasma treated surface.
Nevertheless, when the bumper washed with an organic solvent is immediately placed in a plasma treatment tank, an organic solvent vapor volatilized from the surface of the bumper inhibits the generation of the plasma, and thus an effective plasma treatment cannot be conducted. Accordingly, the organic solvent present on the surface of the bumper is removed in a high temperature atmosphere, prior to the plasma treatment.
A polypropylene resin was blended with, for example, various antioxidants and light stabilizers, to enhance the weathering resistance and light stability thereof, but when such a polypropylene resin is molded into a bumper, washed with a solvent and dried in a high temperature atmosphere, these antioxidants and light stabilizers often bleed out onto the surface of the bumper during the above steps, and this brings a problem in that the plasma treatment of a bumper does not improve the coating property.
SUMMARY OF THE INVENTION
Accordingly, the objects of the present invention are to eliminate the above-mentioned problems of the prior art and to provide a polypropylene resin composition having an excellent weathering resistance and having an excellent coating property after a plasma treatment.
Other objects and advantages of the present invention will be apparent from the following description.
In accordance with the present invention, there is provided a polypropylene resin composition comprising:
(i) 100 parts by weight of a composition of saturated main chain, and
(ii) 0.03 to 0.6 part by weight of a hindered nitrogen-free phenolic antioxidant;
(iii) 0.03 to 0.6 part by weight of a nitrogen-containing hindered phenolic antioxidant;
(iv) 0.03 to 0.5 part by weight of a benzotriazole ultraviolet absorber; and
(v) 0.05 to 1.0 part by weight of a hindered amine light stabilizer having a molecular weight of 500 or more or having no N-H bond and having a molecular weight of less than 500.
In accordance with the present invention, there is also provided a polypropylene resin composition comprising:
(i) 100 parts by weight of a composition of substantially saturated main chain, and
(ii) 0.03 to 1.0 part by weight of a hindered phenolic antioxidant;
(iii) 0.01 to 0.5 part by weight of an organic sulfur type antioxidant; and
(iv) 0.05 to 1.0 part by weight of a hindered amine light stabilizer having no N-H bond.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the polypropylene resin composition according to the first embodiment of the present invention, the weathering resistance is m
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Oct. 16, 1992 Communication from the European Patent Office in Application 90314277.6 with European Search Report and Annex thereto.
Kita Yasuo
Nakano Yoshifumi
Tanaka Kazuyoshi
Ueno Kohhei
Morgan Kriellion S.
Ube Industries Ltd.
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