Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-01-02
1998-05-05
Caldarola, Glenn
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526943, 5263472, 526170, 502103, 502117, 502118, 502123, 502124, 502132, 502152, 556 43, 556 52, 556 53, A01J 3100, C08F 444, C08F 402, B01J 3700, B01J 3100
Patent
active
057476144
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel catalyst for producing a styrenic polymer and a process for producing a styrenic polymer by using the same. More particularly, it pertains to a highly active catalyst for producing a styrenic polymer which contains a transition metal compound having a specific substituted indenyl group as a ligand and a process for efficiently producing a styrenic polymer having a high degree of syndiotactic configuration in its aromatic vinyl chain of the polymer.
BACKGROUND ART
Heretofore, styrenic polymers produced by the radical polymerization method or the like have an atactic configuration in stereostructure and are molded to various shapes by various molding methods such as injection molding, extrusion molding, blow molding, vacuum molding and cast molding, and they have been widely used as domestic electrical appliances, office machines, household goods, packaging containers, toys, furnitures, synthetic papers, and other industrial materials.
However, such styrenic polymers having atactic configuration have disadvantage that it is inferior in heat resistance and chemical resistance.
As opposed to the above, a styrene polymer having a syndiotactic configuration has a melting point higher than that of the conventional atactic polystyrene, and is expected to be used as a heat-resistant resin in various fields.
The present inventors have previously succeeded in developing such styrenic polymers having a syndiotactic configuration and disclosed a process for producing the same (see Japanese Patent Application Laid-Open Nos. 104818/1987, 187708/1987, 179906/1988, 241009/1988, 294705/1989 etc.).
Among the above-mentioned techniques, Japanese Patent Application Laid-Open No. 294705/1989 discloses a process for producing a styrenic polymer having a syndiotactic configuration by the use of a catalyst which comprises in combination a transition metal compound having an unsubstituted indenyl group as a .pi.-ligand and an aluminoxane. However, the catalyst which comprises a transition metal compound having an unsubstituted indenyl group has not necessarily been sufficiently satisfactory with regard to its activity.
It view of the above, it is an object of the present invention to provide a novel and highly active catalyst for efficiently producing a styrene polymer having a high degree of syndiotactic configuration in its aromatic vinyl chain of the polymer, and at the same time, a process for producing a styrenic polymer by the use of said catalyst.
DISCLOSURE OF THE INVENTION
As a result of intensive research and investigation accumulated by the present inventors in order to attain the above-mentioned object, it has been found that a catalyst containing a transition metal compound having as a .pi.-ligand, an indenyl group bearing at least one substituent group on the side of its five-membered ring, especially a catalyst comprising the above-mentioned transition metal compound and an aluminoxane and/or a specific ionic compound, or a catalyst comprising the above-mentioned transition metal compound and an aluminoxane and/or a specific ionic compound and a Lewis acid possesses a high activity and can efficiently produce an objective styrenic polymer having a high degree of syndiotactic configuration in its aromatic vinyl chain of the polymer. The present invention has been accomplished by the foregoing finding and information.
Specifically, the present invention provides a catalyst for producing a styrenic polymer which comprises a transition metal compound having as a .pi.-ligand, an indenyl group bearing at least one substituent group on the side of its five-membered ring and a catalyst for producing a styrenic polymer which comprises (A) the aforesaid transition metal compound, (B) an aluminoxane and/or an ionic compound comprising a non-coordinating anion and a cation, and a (C) Lewis acid to be used as the case may be.
The present invention also provides a process for producing a styrenic polymer which comprises polymerizing an (a) styrenic monomer or an (a) s
REFERENCES:
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patent: 5461128 (1995-10-01), Takeuchi et al.
patent: 5543373 (1996-08-01), Winter et al.
patent: 5594080 (1997-01-01), Waymouth et al.
Shouzaki Hajime
Takeuchi Mizutomo
Tomotsu Norio
Caldarola Glenn
Idemitsu Kosan Co. Ltd.
Pasterczyk J.
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