Polymerization catalyst and process for producing polymers

Details Polymerization catalyst and process for producing polymers Polymerization catalyst and process for producing polymers

1998-06-05

2000-06-13

Kopec, Mark

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526151, 526160, 526165, 502152, 502161, 502224, 502228, 502242, 502302, 502305, 502349, 502353, C08F 402, B01J 3106

Patent

active

060751029

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a polymerization catalyst and a process for producing polymers, and more particularly, to a polymerization catalyst which can produce styrenic polymers having the syndiotactic configuration or polyolefins efficiently at a low cost and a process for producing said polymers.


BACKGROUND ART

Recently, processes for producing a styrenic polymer having the syndiotactic configuration in the presence of a catalyst comprising a transition metal compound, particularly a titanium compound, and methylaluminoxane as the main components have been proposed (the specifications of Japanese Patent Application Laid-Open No. Showa 62(1987)-187708 and other like applications).
In order to produce a styrenic polymer having the syndiotactic configuration efficiently in the above processes without the aluminoxane which is expensive and used in a large amount, processes using a coordinated complex compound comprising an anion having a plurality of groups bonded to a metal and a cation have also been proposed (the specifications of Japanese Patent Application Laid-Open Nos. Heisei 2(1990)-415573 and Heisei 2(1990)-415574 and other like applications).
To polymerize a monomer in the presence of the above catalysts, processes for producing high performance polymers with a high yield in the presence of catalysts formed by reaction of a transition metal compound with a reaction product of an organoaluminum compound with water or a compound which can form an ionic complex by reaction with the transition metal compound are already disclosed.
However, these catalysts cannot always exhibit a sufficient catalytic activity, and large amounts of metals are often left remaining in the formed polymer to cause adverse effects on physical and other properties of the polymer. As the result, complicated facilities are required for the after-treatment of the polymer.
The above processes have other problems in that the catalytic activity is decreased to increase the contents of residual metals in the formed polymer, and decomposition products of the alkylaluminum are left remaining in the polymer, and that, when the temperature of polymerization is increased, the catalytic activity is decreased to increase the contents of residual metals in the formed polymer.
Accordingly, development of a polymerization catalyst which can achieve decrease in the contents of residual metals in obtained polymers, simplification of the process for producing polymers, and reduction of the production cost of polymers has been desired. Development of a polymerization catalyst which provides a polymer having a higher molecular weight than that of polymers obtained in the presence of conventional catalysts has also been desired.


DISCLOSURE OF THE INVENTION

As the result of intensive studies by the present inventors under the above circumstances, it was found that the above problems can be solved by using a polymerization catalyst comprising a transition metal compound having specific substituents and a specific compound containing oxygen for polymerization of monomers, such as styrene and the like. The present invention has been completed on the basis of the above knowledge.
Accordingly, the present invention provides a polymerization catalyst comprising: (1) or general formula (2): lanthanoid metal; R represents hydrogen atom, an alkyl group having 1 to 50 carbon atoms, or an aryl group having 6 to 50 carbon atoms; R.sup.1, R.sup.2, and R.sup.3 each represents hydrogen atom, an alkyl group, an alkoxy group, an aryl group, an alkylaryl group, an arylalkyl group, an aryloxy group, an acyloxy group, vinyl group, allyl group, an ethynyl group, an amino group, an amido group, a phosphido group, an alkylthio group, an arylthio group, a halogen atom, or Cp which represents cyclopentadienyl group, a substituted cyclopentadienyl group, indenyl group, a substituted indenyl group, fluorenyl group, or a substituted fluorenyl group; a and b each represents an integer of 0 to 3; c represents an integer of 0 to 2; any two groups of R

REFERENCES:
patent: 4978730 (1990-12-01), Maezawa et al.
patent: 5596055 (1997-01-01), Aoyama et al.
patent: 5623034 (1997-04-01), Aoyama et al.
patent: 5756416 (1998-05-01), Wasserman et al.
patent: 5756612 (1998-05-01), Aoyama et al.

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