Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-07-11
1998-09-15
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526132, 526133, 526134, 526142, 526148, 526153, 526161, 526165, 526170, 526346, 526943, 502103, 502129, 502132, 502153, 502154, 502155, C08F 4642, C08F 1208
Patent
active
058079408
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a catalyst for polymerization and a process for producing a styrenic polymer by using this catalyst. More particularly, the present invention relates to a catalyst for polymerization which has a high activity and enables reduction of the content of the residual metal in the polymer, simplification of the production process, decrease in the production cost, and improvement of physical properties of the polymer, and a process for efficiently producing a styrenic polymer having a highly syndiotactic configuration by using this catalyst for polymerization.
BACKGROUND ART
A process for efficiently producing polymers, such as styrenic polymers and olefinic polymers having excellent properties, by using a catalyst obtained by bringing a compound which can form an ionic complex by the reaction with a transition metal compound or a reaction product of an organoaluminum compound with water into interaction with a transition metal compound, was recently developed and is attracting attention.
However, because the activity of this catalyst is not always sufficient, a large amount of the metal is left remaining in the formed polymer. The residual metal adversely affects physical properties of the polymer, and complicated after-treatments are required to reduce the adverse effect.
Styrenic polymers produced by the radical polymerization have the steric structure of the atactic configuration. These polymers are molded into articles of various shapes by a process, such as the injection molding, the extrusion molding, the blow molding, the vacuum molding, and the casting, and widely used in various applications, such as home electric appliances, office instruments, home goods, packaging containers, toys, furnitures, synthetic papers, and other industrial materials.
However, the styrenic polymers having the atactic configuration has a drawback in that heat stability and chemical resistance are inferior.
On the other hand, a styrenic polymer having the syndiotactic configuration has a higher melting point than that of conventional polymers having the atactic configuration, and is expected to be used as a heat resistant resin in various applications.
DISCLOSURE OF THE INVENTION
The present invention has an object of providing a novel catalyst for polymerization which has a high activity and enables reduction of the content of the residual metal in the polymer, simplification of the production process, decrease in the production cost, and improvement of physical properties of the polymer, and a process for efficiently producing a styrenic polymer having a highly syndiotactic configuration by using a catalyst for polymerization having a high activity.
As the result of the studies undertaken by the present inventors to achieve the above object, it was discovered that a catalyst for polymerization comprising a specific transition metal compound and a compound which can form an ionic complex by the reaction with the transition metal compound or a specific oxygen-containing compound, or a catalyst for polymerization comprising a metal compound containing alkyl group in addition to the components described above, has a high activity and enables reduction of the content of the residual metal in the polymer, simplification of the production process, decrease in the production cost, and improvement of physical properties of the polymer, and that a styrenic polymer having a highly syndiotactic configuration can efficiently be obtained by homopolymerization of a styrenic compound or copolymerization of a styrenic compound with other styrenic compound and/or other polymerizable unsaturated compounds by using the this catalyst. The present invention was completed on the basis of the discoveries.
Accordingly, the present invention provides a catalyst for polymerization comprising (A) a transition metal compound containing at least one linkage represented by the general formula (I): lanthanoid series on the Periodic Table, Z represents an element of Group 15 of the Periodic Table, and C
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Aoyama Yoshiaki
Tomotsu Norio
Idemitsu Kosan Co. Ltd.
Teskin Fred
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