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
1997-05-13
1998-08-25
Michl, Paul R.
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...
525 66, C08K 334
Patent
active
057984034
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a novel heat resistant thermoplastic resin composition, giving a shaped article, which is superior in heat distortion resistance, impact strength and surface appearance, and, which is also superior in flowability in its molding process.
BACKGROUND OF THE INVENTION
Since polyamide resins are superior in heat distortion resistance, rigidity, resistance against chemicals, etc., they are widely used as electrical and automotive parts and other applications. However, it is still desired that they are improved further in impact resistance and water proofing property. On the other hand, since ABS resins, which are representative rubber reinforced resins, are superior in impact strength and flowability at molding, they are also used for such applications as automotive parts, electrical applications or other miscellaneous goods. However, it is also desired that it is improved further in its anti-chemical property, heat distortion resistance, rigidity, etc..
It has been tried to blend a polyamide resin and an ABS resin in order to make the best use of properties of both resins, but a combination of these polymers has a very poor compatibility by nature. Therefore, a molded article made of a blended composition of these two resins is resulted to be unacceptable for a practical use because of poor surface appearance, layer-like peeling, low impact strength, etc., since a dispersion of two resins becomes non-uniform.
Under these circumstances, it has been tried to improve the compatibility between the polyamide resin and the ABS resin by adding a compatibilizer or by modifying the ABS resin itself. For example, a method, where an amine-end group(s) of the polyamide resin is reacted with a graft-copolymer which has been obtained by grafting a monomer containing an unsaturated carboxylic acid on a rubber, is disclosed in unexamined Japanese patent (TOKUKAISHOU 47-6284(1972)), and the other method which introduces a styrene-maleic anhydride as a compatibilizer is disclosed in unexamined Japanese patent (TOKUKAISHOU 56-50931 (1981). And, further, Japanese unexamined patents(TOKUKAI-SHOU 63-179957 (1988). TOKUKAISHOU 63-182369(1988)) disclose a method that polyamide resins are blended with modified styrene resins, which are obtained by grafting styrene, acrylonitrile and an unsaturated carboxylic acid on a rubber and, more, Japanese unexamined patent(TOKUKAISHOU 58-93745 (1983)) discloses a method that polyamide resins are blended with modified polystyrene resins which are obtained by grafting styrene, acrylonitrile and an unsaturated carboxylic acid on a rubber. These methods are certainly able to improve the compatibility between a polyamide resin and an ABS resin and to increase the impact strength as well, but heat distortion property of them is still at an insufficient level.
Also, as a means for improving the heat distortion property, Japanese examined patent(TOKUKOUSHOU 61-60098 (1986)) and Japanese unexamined patent(TOKUKAISHOU 62-22844 (1987)) disclose a method in which a copolymerized resin containing an imide compound is added as the third component to the above-mentioned blend resins. However, these methods have such problems as a remarkable decrease of the original impact strength and flowability, though the heat distortion property is surely improved.
The present invention provides thermoplastic resin compositions giving molded articles which have superior properties in heat distortion, impact strength and surface appearance, and, which have good flowability in molding process as well, thus having solved these problems as mentioned above.
The inventors of the present invention had made a series of studies on improving the compatibility between ABS resins and polyamide resins and on increasing heat distortion temperature of the blend of these two components, and found that a thermoplastic resin composition, which is obtained by blending a polyamide resin(A), a copolymer(B) which is obtained by copolymerizing an aromatic vinyl compound a vinyl cyanide c
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patent: 4098734 (1978-07-01), Lee
patent: 4584344 (1986-04-01), Baer
patent: 4981906 (1991-01-01), Tomono
patent: 4985486 (1991-01-01), Westeppe
patent: 4994508 (1991-02-01), Shiraki
patent: 5202379 (1993-04-01), Aoki
Asada Masahiro
Kobayashi Hiroshi
Yamashita Koichi
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Michl Paul R.
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