Metallocene compounds and process for the preparation of...

Details Metallocene compounds and process for the preparation of... Metallocene compounds and process for the preparation of...

2006-11-28

2006-11-28

Lu, Caixia (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C556S053000, C502S103000, C502S155000, C526S160000, C526S165000, C526S943000

Reexamination Certificate

active

07141637

ABSTRACT:
A metallocene compound of formula (I) wherein M is zirconium, hafnium or titanium; X is hydrogen, halogen, or a hydrocarbyl radical optionally containing heteroatoms; R2, R3, R4and R5, are hydrogen or hydrocarbyl radicals; R6is a hydrocarbil radical; L is a divalent bridging group T is a radical of formula (II), (III), (IV) or (V), wherein R8and R9are a hydrogen atom or a hydrocarbyl radical. with the proviso that at least one group among R1, R5, R6and R8is a group of formula C(R11)2R12wherein R11, equal to or different from each other, is an hydrocarbyl radical; and R12is hydrogen or an hydrocarbyl radical. These compounds are fit for the preparation of propylene copolymers.

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J. A. Ewen et al., “ChiralAnsaMetallocenes with Cp Ring-Fused to Thiophenes and Pyrroles: Syntheses, Crystal Structures, and Isotactic Polypropylene Catalysts;”J. Am. Soc., vol. 123(20), p. 4763-4773 (2001).

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