Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-01-23
1997-09-23
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526113, 526114, 526116, 526118, 526126, 526127, 526132, 526133, 526134, 526148, 526151, 526152, 526153, 526160, 526170, 526347, 502113, 502114, 502115, 502129, 502132, 502133, 502152, 502153, 502154, 502155, C08F 4643, C08F 1204
Patent
active
056705875
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel catalyst for the production of an aromatic vinyl compound-based polymer composition and to a process for the production of an aromatic vinyl compound-based polymer composition by using the same. More particularly, it pertains to a highly active catalyst for producing an aromatic vinyl compound-based polymer composition which catalyst comprises at least two different transition metal compounds each having one .pi.-ligand and to a process for efficiently producing a resin composition which comprises an aromatic vinyl compound-based polymer having a high degree of syndiotactic configuration in its aromatic vinyl chains and a rubbery elastomer, both being uniformly mixed with each other by the use of the above-mentioned catalyst.
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, sheets, films and other industrial materials.
However, such styrenic polymers having atactic configuration have suffered the disadvantage that they are inferior in heat resistance and chemical resistance.
The group of the present inventors has previously succeeded in developing styrenic polymers having a high degree of syndiotacticity (see Japanese Patent Application Laid-Opent Nos. 187708/1987, 179906/1988, 241009/1988, 249504/1992 etc.).
On the other hand, since the styrene polymers having a syndiotactic configuration have melting points which are different from those of the conventional atactic polystyrenes, and are higher than those of the isotactic polystyrenes known so far, they are expected to be used as heat-resistant resins in various fields.
Moreover, in order to efficiently take advantage of the heat resistance, investigation has been made on the blending of the syndiotactic polystyrene with different kinds of resins (refer to Japanese Patent Application Laid-Open Nos. 257950/1987, 146944/1989, 279944/1989, etc.)
Of these, there has been obtained a resin composition improved in impact resistance by the blending with a rubbery elastomer. However, in the production of the composition of the syndiotactic polystyrene with the rubbery elastomer, blending was carried out by kneading, but it has been required to sufficiently perform the kneading for the purpose of attaining satisfactory dispersibility of each component. It is necessary in this case, to cut the rubbery elastomer into small pieces prior to the kneading because of the elasticity imparted to the rubbery elastomer. However, some problems still remain in the handling of the rubbery elastomer owing to its elasticity and also in that during the course of kneading the styrenic poymer having a syndiotactic configuration at an elevated temperature because of its high melting point, the kneading brings about lowering in the molecular weight of the resin composition to be produced, deterioration of the resin composition itself, progress of the rubber crosslinking and the like, if an excessive shear force is applied over a long time to carry out sufficient kneading.
Under such circumstances, it was found by the group of the present inventors that the rubbery elastomer is favorably dispersed and a resin composition having excellent impact resistance is obtained by polymerizing or copolymerizing a styrenic monomer in the presence of a specific catalyst in the system in which the rubbery elastomer is allowed to be present in advance in order to solve the above-mentioned problems. Thus, the process for producing the aforesaid resin composition was proposed before (refer to Japanese Patent Applicaiton Laid-Open No. 211410/1992.) Nevertheless, the above-proposed process has still involved the problem that since the cata
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Kuramoto Masahiko
Shouzaki Hajime
Takeuchi Mizutomo
Tomotsu Norio
Idemitsu Kosan Co. Ltd.
Teskin Fred
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