Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-05-17
2005-05-17
Rabago, Roberto (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S160000, C526S161000, C526S172000, C526S346000, C526S347000, C526S347100, C502S103000, C502S117000, C502S152000, C502S155000, C556S052000, C556S055000, C556S001000
Reexamination Certificate
active
06894129
ABSTRACT:
The present invention relates to a catalyst for preparing vinyl aromatic polymer and styrene polymerization using the same, and particularly to a transition metal half metallocene catalyst with a novel structure for preparing syndiotactic styrene polymer having high activity, superior stereoregularity, high melting point and various molecular weight distributions and a process for preparing styrene polymer using the same. The present invention provides a multinuclear half metallocene compound in which two or more of transition metals of groups 3 to 10 on periodic table are connected through bridge ligand simultaneously containing π-ligand cycloalkandienyl group and σ-ligand functional group and its preparation, and a process for preparing styrene polymer using the compound as a catalyst. Polymers with various molecular weight distributions as well as vinyl aromatic polymer having predominant syndiotactic structure can be prepared with high activity using the multinuclear half metallocene catalyst.
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Y. Kim, et al., “New half-sandwich metallocene catalyst for polyethylene and polystyrene”, Journal of Organometallic Chemistry 634, 2001, pp. 19-24.
Y. Tianger, et al., “Recent Advances in Synthesis of Novel Half-Sandwich Group 4 Metallocene Complexes”, Chemical Journal on Internet, retrieved on Aug. 29, 2002.
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International Search Report; PCT/KR02/01317; Oct., 9, 2002.
Jeong You-Mi
Lee Min-Hyung
Ryu Jin-Young
Cantor & Colburn LLP
LG Chem Ltd.
Rabago Roberto
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