Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1990-10-05
1993-11-09
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526160, 526165, 526251, 526281, 526282, 526293, 526308, 526336, 526340, C08F21208, C08F 4642
Patent
active
052603946
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to styrene copolymer and process for production thereof, more specifically it relates to copolymer having a specific stereostructure which comprises a styrene monomer and olefin monomer or diene monomer, and to an efficient process for production thereof.
BACKGROUND OF THE INVENTION
A styrene polymer produced by the radical polymerization method, etc. has an atactic configuration in stereostructure. It is molded into various shapes by various molding methods such as injection molding, extrusion molding, blow molding, vacuum molding and cast molding, and is widely used for domestic electric appliances, office equipments, domestic appliances, packaging containers, toys, furniture, synthetic papers and other industrial materials.
However, the styrene polymer having an atactic configuration has drawbacks of insufficient heat resistance and chemical resistances.
The group of the present inventors have succeeded to develop a styrene polymer having a high degree of syndiotacticity, and also developed a styrene polymer in which other components are copolymerized with the styrene monomer (Japanese Patent Application Laid-Open Nos. 104818/1987 and 241009/1989). Such polymer or copolymer having a syndiotactic configuration has excellent heat resistance, chemical resistance and electric characteristic, and expected to be applied in various fields.
However, in the above polymer, particularly, syndiotactic polystyrene, glass transition temperature is high, i.e., 90.degree. to 100.degree. C., and melting point is 270.degree. C. Accordingly, the polymer has defects that it cannot sufficiently show its characteristics unless injection molding temperature is set at high temperature. In addition, the molded product obtained by using a high temperature mold is required to be improved in impact resistance. The above polymer has disadvantages in that it has poor compatibility with polyolefins such as polyethylene, polypropylene and the like. Such polymer has insufficient compatibility and adhesion with other resin, inorganic fillers or the like.
Particularly, compared with olefin polymer which is characterized in its flexibility, the syndiotactic polystyrene should be improved in its solvent resistance, heat resistance and impact resistance.
Accordingly, the present inventors have studied intensively to decrease the glass transition temperature of syndiotactic polystyrene to enable injection molding at low temperature and further to improve impact resistance and compatibility and adhesion with other resins including polyolefin and inorganic fillers.
As the results, it has been found that copolymerization of styrene monomer and olefin monomer or diene monomer in the presence of a specific catalyst provides a copolymer having styrene repeating unit chain with syndiotactic configuration copolymerized with olefin component or diene component. Such copolymer has excellent heat resistance and chemical resistance. Further, it can be injection molded at low temperature because of its reduced glass transition temperature. Moreover, it has good compatibility with other resins. Thus it has been found that the objective modification can be attained.. The present invention has been established based on such findings.
SUMMARY OF THE INVENTION
The present invention provides styrene copolymer which comprises a styrene repeating unit (a) represented by the general formula (I): ##STR3## (wherein R.sup.1 is a hydrogen atom, a halogen atom or a hydrocarbon group having not more than 20 carbon atoms, n is an integer of 1 to 3, and when n is plural, R.sup.1 s may be the same or different) ##STR4## (wherein R.sup.2 is a hydrogen atom or a saturated hydrocarbon group having not more than 20 carbon atoms) an olefin repeating unit (b) or a diene repeating unit (c), wherein intrinsic viscosity (measured in 1,2,4-trichlorobenzene at 135.degree. C.) is 0.07 to 20 dl/g and the stereostructure of the styrene repeating unit chain is high degree of syndiotactic configuration.
Further, the present inve
REFERENCES:
patent: 2989515 (1961-06-01), Bruton et al.
patent: 4680353 (1987-07-01), Ishihara et al.
English Language Translation of Japanese Patent 60-26011, published Feb. 1985.
Hackh's Chem. Dictionary, J. Grant (ed.) McGraw-Hill Co., N.Y., 27, 712 (1969).
Kuramoto Masahiko
Tazaki Toshinori
Idemitsu Kosan Co. Ltd.
Teskin Fred
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