Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1996-09-23
2001-02-20
Hoke, Veronica P. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S116000, C524S141000, C524S145000, C524S169000, C524S232000, C524S267000, C524S296000, C524S297000, C524S308000, C524S313000, C524S385000, C524S397000, C524S398000, C524S403000, C524S483000, C524S485000, C524S487000, C524S490000
Reexamination Certificate
active
06191197
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to novel oil extended polystyrene compositions. More particularly, it pertains to a polymer gel blend of syndiotactic polystyrene, a rubbery elastomer and an extender oil.
2. Description of Prior Art
A styrenic polymer having syndiotactic configuration (sPS) is excellent in heat resistance and chemical resistance but displays a high Shore A hardness and is poor in impact resistance, flexibility and elasticity and therefore, the potential usage of this polymer has certain limitations. In order to solve the above-mentioned problem, attempts have been made to improve the impact resistance of sPS, for example, by blending a rubbery elastomer and/or other thermoplastic resin with sPS as displayed in U.S. Pat. Nos. 5,391,611; 5,395,890; and 5,247,020. However none of these patents disclose improvements in the blends resulting in softness, flexibility, elasticity and/or damping characteristics or the inclusion of oil or other extenders to achieve these properties.
It has been known in the past to extend thermoplastic elastomers with petroleum base oils such as naphthenic, aromatic and paraffinic oils and other low weight molecular organic materials in order to reduce costs and to improve the elastomeric properties of certain of the thermoplastic elastomers. In U.S. Pat. No. 5,451,454, owned by the current assignee, a blend of a high-molecular weight block copolymer having a hard block and a soft block and a large volume of oily or low molecular weight material provides a composition having unique softness, adequate mechanical strength and damping properties useful in many industrial applications. The heat resistance of this composition was not adequate for higher temperature applications including many uses in automobiles and electrical appliances.
It is extremely desirable to prepare a polymer composition having elastomeric characteristics, good mechanical strength, unique softness and various utilities in high temperature applications.
SUMMARY OF THE INVENTION
The object of the present invention under such circumstances is to provide an oil or low molecular weight component extended syndiotactic polystyrene-elastomeric polymer blend soft gel composition having damping properties useful in producing molded products having heat resistance and a high elasticity and damping property such as industrial materials such as electric and electronic materials, industrial construction materials, car parts, domestic electrical appliances and various mechanical parts.
The composition of the present invention consists of syndiotactic polystyrene (sPS) and a rubbery elastomer and then further blending 100 parts by weight of the polymer blend with at least 30 parts by weight of an extender such as oil or a low molecular weight component.
Specifically, the first aspect of the present invention provides a gel composition which comprises 100 parts by weight of a resin blend component comprising 1 to 90% by weight of a styrenic polymer having syndiotactic configuration and 99 to 10% by weight of an elastomeric polymer; and at least 30 part by weight of an extender oil or a low molecular weight component.
This invention concerns a gel composition useful in preparing products which have thermal stability, softness, excellent mechanical strength, moldability and damping characteristics. These thermoplastic elastomers containing compositions can be widely used as materials intermediate between rubber and plastics, or as rubber substitutes in automotive parts and others.
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Clark Frank J.
Hall James E.
Luo Xiao-Liang
Mashita Naruhiko
Matsuse Takahiro
Bridgestone Corporation
Burleson David G.
Hoke Veronica P.
Skerry Ann M.
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