Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1995-06-09
2000-08-22
Wu, David W.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
502103, 502162, 502164, 526126, 526127, 526132, 526133, 526134, 526160, 526161, 526165, 526172, C08F 464
Patent
active
06107232&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel polymerization catalyst and a process for preparing a polymer by the use of the catalyst. More specifically, the present invention relates to a polymerization catalyst suitable for olefin polymerization, and a process for efficiently preparing a homopolymer or a copolymer of an olefin by the use of this catalyst.
BACKGROUND ART
Heretofore, combinations of transition metal compounds and aluminoxanes are known as highly active soluble catalysts for olefin polymerization (Japanese Patent Application Laid-open Nos. 19309/1983 and 217209/1985). Furthermore, it has been reported that ionic complexes are useful as active species of soluble catalysts for olefin polymerization [Journal of the American Chemical Society (J. Am. Chem. Soc.), Vol. 81, p. 81 (1959), Vol. 82, p. 1953 (1960), and Vol. 107, p. 7219 (1985)].
Moreover, examples in which these active species are isolated and applied to the olefin polymerization have been described in J. Am. Chem. Soc., Vol. 108, p. 7410 (1986), Japanese Patent Application Disclosure No. 502636/1989, Japanese Patent Application Laid-open No. 139504/1991 and EP Laid-open Patent No. 468651, and examples in which these active species are used together with organic aluminum compounds have been described in Japanese Patent Application Laid-open No. 207704/1991 and International Patent Laid-open No. 92-1723.
However, polymers produced by the use of complexes having cyclopentadienyl ligands which have been used in these conventional techniques have a problem that the molecular weight of the obtained polymer is low, in the case that the polymerization is carried out at a reaction temperature of 70 to 200.degree. C. which is efficient in an industrial process, or at a higher temperature.
DISCLOSURE OF THE INVENTION
Under such circumstances, the present invention has been attained for the purpose of providing a polymerization catalyst which has a high activity at 70 to 200.degree. C. which is efficient in an industrial process or at a higher temperature and which permits the formation of a polymer having a high molecular weight and a uniform composition, and a process for efficiently preparing a homopolymer or a copolymer of an olefin by the use of this polymerization catalyst.
The present inventors have intensively researched with the intention of achieving the above-mentioned object, and as a result, it has been found that this object can be achieved by a polymerization catalyst containing a specific transition metal compound, an activation cocatalyst, particularly an activation cocatalyst which is a compound capable of forming a cationic species from the transition metal compound or its derivative, and an organic aluminum compound which can be used in a certain case. The present invention has been completed on the basis of such a knowledge.
That is to say, the present invention provides a polymerization catalyst which comprises (A) a transition metal compound represented by the general formula (I) an actinide series of the periodic table, L represents a formula ##STR1## (wherein A, B and C each represents an element in the group 13, 14, 15 or 16 of the periodic table, at least one of A and C represents an element in the group 15, and A-B, B-B and B-C each is linked by a single bond, a double bond or a combination thereof; A is bonded to M, C is coordinated with M in the case that C has a lone pair, or C is bonded by resonance in the case that the resonance occurs among M, A, B and C; n represents an integer of 0 to 10, and ((R.sup.2).sub.b -B)s may be the same or different; R.sup.1, R.sup.2 and R.sup.3 each represents a hydrogen atom, a halogen atom, an organic metalloid group, an alkoxy group, an amino group, a hydrocarbon group or a hetero-atom-containing hydrocarbon group, they may be the same or different from each other, R.sup.1, R.sup.2 and R.sup.3 may crosslink therebetween, and R.sup.1, R.sup.2, R.sup.3 and M may crosslink therebetween; and a, b and c each is an integer of 0 to 3), d is an integer which is not le
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Choi Ling Sui
Idemitsu Kosan Co. Ltd.
Wu David W.
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