Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-10-23
2007-10-23
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S170000, C526S941000, C526S943000, C556S053000, C556S052000, C556S051000, C502S103000
Reexamination Certificate
active
10828814
ABSTRACT:
A catalyst system includes a metallocene compound having the formula R9L1L2M1R1R2wherein R9is a bridge between ligands L1and L2and M1is a metal of Group IVB of the Periodic Table such as titanium, zirconium and hafnium and R1and R2can be hydrogen or aliphatic or aromatic groups. Bridge R9can include silicon, germanium or tin. The metallocene compound of the invention as synthesized has a racemic to meso isomer ratio of greater than 5 to 1, thereby precluding the need for subsequent separation of the meso isomer.
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Paczkowski Nicola Stefanie
Schottek Joerg
Sell Thorsten
Winter Andreas
Dilworth & Barrese LLP
Lee Rip A.
Novolen Technology Holdings C.V.
Wu David W.
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