Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2006-04-04
2006-04-04
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...
C526S169100, C526S161000, C526S348000, C526S318000, C526S328000, C526S329300, C526S329700
Reexamination Certificate
active
07022788
ABSTRACT:
A process for the polymerization and copolymerization of olefins is disclosed, comprising contacting the monomeric olefin under polymerization conditions with a polymerization catalyst or catalyst system which comprises (a) a source of a Group VIII metal; (b) a bidentate phosphine ligand having the formula (R1)(R1)P—X—P(R1)(R1), where each R1is independently selected from a phenyl group or a substitued phenyl group with the proviso that at least one of the R1groups is a phenyl group having at least one ortho substituent, and X is a bridging group of the structure —[N]x—[P]y—[N]— where x and y are independently 0 or 1, or —C(R4)2— where R4may be the same or different and is hydrogen or a monovavlent hydrocarbyl, substituted hydrocarbyl or hetero-hydrocarbyl group; and optionally (c) a promoter.
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BP Chemicals Limited
Finnegan, Henderson Farabow, Garrett and Dunner L.L.P.
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