Rare earth homogeneous catalysts for the ring-opening polymeriza

Details Rare earth homogeneous catalysts for the ring-opening polymeriza Rare earth homogeneous catalysts for the ring-opening polymeriza

1994-02-01

1995-06-06

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526170, 526308, 526309, C08F 452

Patent

active

054224063

ABSTRACT:
The organolanthanide hydrides (Cp'.sub.2 LnH).sub.2 (Cp'=.eta..sup.5 -Me.sub.5 C.sub.5 ;Ln=Sm,Lu) rapidly catalyze the copolymerization of methylenecyclopropane and ethylene to cleanly yield high molecular weight polyolefins of microstructure {[CH.sub.2 CH.sub.2 ].sub.x [CH.sub.2 CH.sub.2 C(CH.sub.2)].sub.y }n via sequential olefin insertion and ring-opening/.beta.-alkyl shift processes. Homopolymerization of methylenecyclopropane likewise cleanly yields polymers of the structure [CH.sub.2 CH.sub.2 C(CH.sub.2)].sub.n.

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