Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-05-31
1998-07-07
Wilson, Donald R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 68, 525 71, 525 93, 525 98, 525132, C08L 2506, C08L 5302, C08L 900, C08L 2316
Patent
active
057770280
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an impact resistant polystyrene composition. More particularly, it pertains to a syndiotactic polystyrene composition which is excellent not only in heat resistance and modulus of elasticity but also in impact resistance and extensibility.
BACKGROUND ART
A styrenic polymer having syndiotactic configuration (hereinafter sometimes abbreviated as SPS) is excellent in heat resistance and chemical resistance but is poor in impact resistance and therefore, it has heretofore been limited in the scope of application usable as a construction material. In order to solve the problem, improvement have been made on the impact resistance of SPS, for example, by blending a rubbery elastomer and/or other thermoplastic resin with SPS. (Refer to Japanese Patent Application Laid-Open Nos. 257950/1987, 146944/1989, 182344/1989, 279944/1989 and 64140/1990.)
For example, there are available SPS containing a styrenic compound as a component and as a rubbery elastomer (refer to Japanese Patent Application Laid-Open No. 146944/1989), a SPS/rubber composition incorporated with a block or graft copolymer containing atactic polystyrene chain as a compatibilizer (refer to Japanese Patent Application Laid-Open No. 279944/1989), and a SPS/rubber composition incorporated with a poly(phenylene ether) (refer to Japanese Patent Application Laid-Open No. 279944/1989) and the like.
However, since there is used in the above-mentioned improved technique, a rubbery component or a block or graft copolymer containing atactic polystyrene chain as a compatibilizer for the purpose of improving the compatibility between SPS and the rubbery component that are incompatible with each other and enhancing the dispersibility and interfacial strength of the rubbery component, the problem still remains unsolved in that the working effect as the compatibilizer and the enhancement of impact resistance have still been insufficient. On the other hand, in the case of adding a large amount of a poly(phenylene ether) for the purpose of enhancing the impact resistance, the addition thereof inevitably brings about the deterioration of the resultant composition with respect to the hue and long-term. heat resistance as well as the decrease in the crystallinity of the SPS.
DISCLOSURE OF THE INVENTION
In view of the above, intensive research and investigation were continued by the present inventors in order to solve the above-mentioned problems. As a result, it has been found that there is obtained a syndiotactic polystyrene composition which is greatly improved in impact resistance and extensibility without impairing heat resistance or modulus of elasticity by blending, with SPS, a rubbery elastomer having an olefinic component as a rubbery component or a polyolefin and also a styrene/olefin block or graft copolymer having a micro-phase separation temperature of 180.degree. C. at the highest when diluted with dioctyl phthalate to 60% by weight solution. The present invention has been accomplished on the basis of the above-mentioned finding and information.
That is to say, the present invention provides an impact resistant polystyrene composition which comprises 5 to 97% by weight of an (a) styrenic polymer having syndiotactic configuration, 2 to 95% by weight of a (b) rubbery elastomer having an olefinic component or a polyolefin, and 0.5 to 10% by weight of a (c) styrene/olefin block or graft copolymer having a micro-phase separation temperature of 180.degree. C. at the highest when diluted with dioctyl phthalate to a solution with a concentration of 60% by weight; and at the same time, an impact resistant polystyrene composition which comprises 5 to 97% by weight of an (a) styrenic polymer having syndiotactic configuration, 2 to 95% by weight of a (b) rubbery elastomer having an olefinic component or a polyolefin, and 0.5 to 10% by weight of a (c) styrene/olefin block or graft copolymer having a micro-phase separation temperature of 180.degree. C. at the highest when diluted with dioctyl phthalate to a solution wi
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Okada Akihiko
Sato Nobuyuki
Idemitsu Kosan Co. Ltd.
Wilson Donald R.
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