Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1993-11-08
1995-02-14
Buttner, David
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525146, 525150, 525151, 525153, 525178, 525185, 525189, 5253262, 5253264, C08L 2712, C08L 6900, C08L 6703, C08L 8100
Patent
active
053897250
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thermoplastic resin composition containing a fluorine-containing elastomer. The composition of the present invention is used for producing a variety of products in the fields of aviation, machinery, office machines, electricity and electronics.
TECHNICAL BACKGROUND
A fluorine-containing elastomer consisting of a copolymer such as a copolymer from vinylidene fluoride and another fluorine-containing monomer is an elastomer excellent in heat resistance and is chemical resistance, and used for various sealing materials or packings.
In recent years, further, a fluorine-containing elastomer has been incorporated into a thermoplastic resin to improve the impact resistance of thermoplastic resins. For example, JP-A-3-263460 discloses an impact-resistant resin composition obtained by incorporating a fluorine-containing elastomer into a polycyanoaryl ether-based resin which is a heat-resistant thermoplastic resin.
As described in the above JP-A-3-263460, however, when a fluorine-containing elastomer is incorporated into a thermoplastic resin, the effect on the improvement in impact resistance is not sufficient although the impact resistance is improved. That is, since the fluorine-containing elastomer has low surface energy and poor wettability to the thermoplastic resin, the compatibility (miscibility) of the fluorine-containing elastomer with the thermoplastic resin is insufficient and the advantage of the fluorine-containing elastomer as an agent for imparting impact resistance cannot be sufficiently worked.
Further, when exposed to a high temperature, the fluorine-containing elastomer is partially decomposed to generate hydrogen fluoride, a strong acid. Therefore, it also has a defect in that a thermoplastic resin composition containing the fluorine-containing elastomer is inferior in heat resistance. As a method for preventing the generation of hydrogen fluoride caused by the decomposition of the fluorine-containing elastomer, JP-A-55-16057 discloses a method in which an amine-containing antioxidant is incorporated into the fluorine-containing elastomer. In view of cost, however, it is not expedient to improve the heat resistance by adding an amine-containing antioxidant to a composition of a thermoplastic resin and a fluorine-containing elastomer, since it increases the number of components which constitute the resin composition. Further, for some intended resin molded articles, it is not undesirable to incorporate an amine-containing antioxidant.
Although the generation of hydrogen fluoride could be prevented by adding an amine-containing antioxidant, it is not possible to expect an effect on the improvement in the impact resistance in all cases.
DISCLOSURE OF THE INVENTION
It is therefore an object of the present invention to provide a novel thermoplastic resin composition containing a fluorine-containing elastomer, which overcomes the above-described defects of conventional thermoplastic resin compositions containing a fluorine-containing elastomer, shows further improved impact resistance and shows improved heat resistance without an antioxidant being incorporated therein.
Studies have been made to achieve the above object, and as a result, it has been found that the treatment of a fluorine-containing elastomer in a basic atmosphere accomplishes the following improvements. thermoplastic resin is improved, and when the fluorine-containing elastomer is incorporated into the thermoplastic resin, the elastomer forms fine particles and fully exhibits its properties as an agent for imparting impact resistance. Therefore, the thermoplastic resin composition containing the fluorine-containing elastomer is further improved in impact resistance. fluorine-containing elastomer is inhibited, and the thermoplastic resin composition containing the fluorine-containing elastomer is improved in heat resistance in the absence of an antioxidant incorporated.
The present invention has been made on the basis of the above findings, and its gist consists in a thermoplastic
REFERENCES:
patent: 3400065 (1968-09-01), Barth
patent: 3507844 (1970-04-01), Wood
patent: 3821326 (1974-06-01), Lauchlan
patent: 4742126 (1988-05-01), Moggi
patent: 5039722 (1991-08-01), Cantatore
Buttner David
Idemitsu Kosan Co. Ltd.
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