Transition metal compound, polymerization catalyst using same an

Details Transition metal compound, polymerization catalyst using same an Transition metal compound, polymerization catalyst using same an

1998-06-03

2000-02-08

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526114, 526115, 526126, 526127, 526132, 526133, 526160, 526170, 526285, 5263472, 526943, 502102, 502118, 502123, 502124, 502152, 502155, 502202, 556 52, C08F 469, C08F 4643, C08F 1208

Patent

active

RE0365637

ABSTRACT:
There are disclosed a transition metal compound of the general formula RMX.sub.a-1 L.sub.b (R is a .pi. ligand, a fused polycyclic cyclopentadienyl group in which at least one of many-membered rings to which cyclopentadienyl groups are fusedly bonded is a saturated ring, M is a transition metal, X is a .sigma. ligand, L is a Lewis base, a is the valency of M, and b is 0, 1 or 2); a polymerization catalyst for styrene, etc. comprising the above transition metal, preferably further comprising an oxygen atom containing compound ionic compound or organoboron compound and optionally a Lewis base; and a process for producing a polymer of a compound containing an ethylenically unsaturated double bond or an acetylenic polymer, especially a syndiotactic polystyrene by using the above polymerization catalyst. The catalyst is particularly effective for producing highly syndiotactic polystyrene minimized in residual metals amounts at a low cost in enhanced efficiency.

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