Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-06-18
1998-04-21
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
2961467, C08L 3306
Patent
active
057418608
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a thermoplastic resin composition low in stiffness such as bending strength, high in impact strength, low in impact-induced stress, i.e., high in impact energy absorptivity, high in resistance to thermal deformation and excelled in moldability, and trim parts molded therefrom for use in interior decoration of automobiles.
BACKGROUND OF THE INVENTION
Styrene-type resins, ABS resins in particular, have many uses for their low stiffness and outstanding impact strength and resistance to thermal deformation. Meanwhile, as trim parts for interior decoration of automobiles, well known are front pillar garnishes, side roof garnishes, center pillar garnishes and incorporated units thereof, which are molded of ABS resins, polypropylene-type resins etc. With these parts, importance has hitherto been attached to such properties as dimensional stability at high temperatures and external appearance. In the United States, there is also a side collision control which requires safety also in case of collision from side.
To meet these requirements, various studies have been made but to date there are but few found to be truly satisfactory.
For example, a method of adding a specific plasticizer to rubber-reinforced styrene-type resins was disclosed in Japanese Laid-open Patent Publication No. 20346/'84 but in this method, too, the resistance to thermal deformation was low and, further, the plasticizer tends to evaporate in use and bleed to cause change of resin properties. Attempts have been made to use a polypropylene-type resin having a specific composition but this also has a number of drawbacks such as poor external appearance due to formation of minor sinks, insufficient dimensional stability due to warping, and poor adhesiveness to other materials. Further, attempts have been made to fill foams such as polyethylene into the inner side of trim parts but failed due to complexity of producing process and expensiveness.
Meanwhile, in recent years ABS resins and acrylic ester-type copolymer compositions are known to improve chemical resistance. For instance, compositions composed of rubber-containing styrene-type resins and high gel-content acrylic ester copolymers proposed in Japanese Laid-open Patent Publication No. 179257/'83 and compositions composed of rubber-containing maleimide-styrene-type copolymers, ABS resins and acrylic ester-type copolymers proposed in Japanese Laid-open Patent Publication No. 17954/'88 are described to be effective for improving chemical resistance. These compositions, however, fail to provide resin compositions low in impact-induced stress, i.e., high in impact energy absorptivity, high in impact strength, highly resistant to thermal deformation and excelled in moldability. That is, these compositions proposed were designed for the improvement of chemical resistance as the major object and had defects of being low in resistance to thermal deformation and moldability with the former, and being low in impact energy absorptivity and impact strength with the latter.
It is an object of the present invention to provide a thermoplastic resin composition low in stiffness such as bending strength, high in impact strength, low in impact-induced stress i.e., high in impact energy absorptivity, highly resistant to thermal deformation and also excelled in moldability and also provide trim parts for interior decoration of automobiles made thereof to thereby solve the aforementioned problems.
After intensive studies for accomplishment of these problems, the present inventors have found that a thermoplastic resin composition composed of a specific copolymer (A), a high .alpha.-methylstyrene-content ABS resin (B) and/or a maleimide-type ABS resin (C) is low in stiffness, high in impact strength, low in impact-induced stress i.e., high in impact energy absorptivity, highly resistant to thermal deformation and also excelled in moldability and thus arrived at the present invention.
DISCLOSURE OF THE INVENTION
The present invention relates to a thermo
REFERENCES:
patent: 4657976 (1987-04-01), Ott et al.
patent: 4954571 (1990-09-01), Iwamoto et al.
patent: 5116909 (1992-05-01), Mishima et al.
Goda Akinaga
Matsumoto Shigemi
Aylward D.
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Marquis Melvyn I.
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