Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-02-21
1994-03-01
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525166, C08L 6702
Patent
active
052908550
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a thermoplastic resin composition which is excellent in sharpness and also in heat resistance, chemical resistance and impact resistance.
BACKGROUND ART
Styrene resins such as polystyrene, a styrene-acrylonitrile copolymer, an ABS resin and an AES or AAS resin which comprises, as a rubber component, an EPDM rubber or acryl rubber have good property balance and dimensional stability and widely used in various fields. Inter alia, the styrene resins find many applications in the automobile field. In this field, the resins should have resistance to, for example, gasoline or a braking oil, and improvement of such resistance is important. As a polymer having good chemical resistance, a saturated polyester resin is known. Since this resin has poor impact resistance, it is proposed to add the ABS resin to the polyester resin (cf. Japanese Patent Publication Nos. 30421/1972 and 25261/1976).
However, a composition of the ABS resin and the saturated polyester resin has insufficient impact strength and poor heat resistance.
In addition, a coating is applied on such composition for the purpose of decoration or improvement of weather resistance. However, sharpness of the coating is poor.
DISCLOSURE OF THE INVENTION
As a results of the extensive study by the present inventors to improve the properties of a composition comprising a rubber-reinforced styrene resin and a saturated polyester resin, it has been found that a composition comprising the rubber-reinforced styrene resin, the saturated polyester and two specific copolymers has excellent sharpness in addition to good heat resistance, impact resistance and chemical resistance, and the present invention has been completed.
Accordingly, the present invention provides a thermoplastic resin composition comprising
100 parts by weight of a mixture of obtainable by graft polymerizing (ii) an aromatic vinyl compound and (iii) a cyanated vinyl compound and/or other vinyl compound in the presence of (i) a rubbery polymer, consisting of (C-1) an .alpha.-methyl-styrene copolymer which comprises (i) .alpha.-methylstyrene, (ii) a cyanated vinyl compound and optionally (iii) an aromatic vinyl compound (except .alpha.-methylstyrene) and/or an alkyl unsaturated carboxylate and (C-2) a maleimide copolymer comprising (i) a maleimide compound and (ii) an aromatic vinyl compound or a combination of an aromatic vinyl compound and other vinyl compound, and
0.2 to 50 parts by weight of (D) an epoxy group-containing olefinic copolymer comprising (i) an olefin and (ii) an epoxy group-containing unsaturated compound or a combination of an epoxy group-containing unsaturated compound and an ethylenically unsaturated compound, wherein a content of said rubbery polymer is from 5 to 25% by weight based on the total weight of the compositon (A+B C+D).
Rubber-reinforced resin (A)
The rubber reinforced resin (A) is a resin which is obtainable by graft polymerizing the aromatic vinyl compound (ii) and the cyanated vinyl compound and/or the other vinyl compound (iii) in the presence of the rubbery polymer (i).
A ratio of the rubbery polymer (i), the aromatic vinyl compound (ii) and the cyanated vinyl compound or the other vinyl compound (III) in the rubber-reinforced styrene resin is not critical. Preferably, an amount of the rubbery polymer is from 10 to 70% by weight, that of the aromatic vinyl compound is from 15 to 70% by weight, and that of the other vinyl compound is from 5 to 50% by weight.
Examples of the rubbery polymer are polybutadiene, styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, ethylene-propylene copolymers, acrylate copolymers, chlorinated polyethylene and the like. They may be used alone or as a mixture thereof. The rubbery polymer may be prepared by emulsion polymerization, solution polymerization, suspension polymerization or bulk polymerization. In the case of the emulsion polymerization, a particle size of the rubbery polymer and a gel content are not limited. Preferably, an average particle size i
REFERENCES:
patent: 3644574 (1972-02-01), Jackson et al.
patent: 3954903 (1976-05-01), Kudo et al.
patent: 4804706 (1989-02-01), Kishida
patent: 4855355 (1989-08-01), Hirai
patent: 4861817 (1989-08-01), Erpelding et al.
patent: 4877833 (1989-10-01), Kondo
patent: 4956407 (1990-09-01), Funasaki et al.
Abe Katsuji
Fujiwara Takayoshi
Kodama Mikio
Umeyama Satoshi
Yano Motoichi
Short Patricia A.
Sumitomo Dow Limited
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