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
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...
C526S113000, C526S348000, C526S348400
Reexamination Certificate
active
07022781
ABSTRACT:
A catalyst system composition comprising a chromium compound supported on a silica-titania support, wherein said catalyst system has been reduced with carbon monoxide, and a cocatalyst selected from the group consisting of i) alkyl lithium compounds, ii) dialkyl aluminum alkoxides in combination with at least one metal alkyl selected from the group consisting of alkyl zinc compounds, alkyl aluminum compounds, alkyl boron compounds, and mixtures thereof and iii) mixtures thereof can be used to polymerize olefins to produce a low density polymer with a decreased melt index and/or high load melt index. This catalyst system also can be used with a Ziegler-Natta catalyst system to polymerize olefins. Polymerization processes using these catalyst system compositions are also provided. Polymers resulting from polymerization processes using the inventive catalyst and cocatalyst systems have a decreased high load melt index, decreased melt index, increased fluff bulk density, and are useful as components to make bi-modal molecular weight resins for film and/or blow molding applications.
REFERENCES:
patent: 3879368 (1975-04-01), Johnson
patent: 3947433 (1976-03-01), Witt
patent: 4180481 (1979-12-01), Schulze
patent: 4312967 (1982-01-01), Norwood et al.
patent: 4321159 (1982-03-01), Bressler et al.
patent: 4328124 (1982-05-01), Speca et al.
patent: 4368302 (1983-01-01), Downs
patent: 4376065 (1983-03-01), Shipley et al.
patent: 4382020 (1983-05-01), Van de Leemput et al.
patent: 4383939 (1983-05-01), Johnstone
patent: 4454242 (1984-06-01), Ikegami et al.
patent: 4458028 (1984-07-01), Van de Leemput et al.
patent: 4504592 (1985-03-01), Van de Leemput et al.
patent: 4514514 (1985-04-01), Martin
patent: 4517345 (1985-05-01), Eve et al.
patent: 4727124 (1988-02-01), Konrad et al.
patent: 4728703 (1988-03-01), Konrad et al.
patent: 4735931 (1988-04-01), McDaniel et al.
patent: 4845176 (1989-07-01), Konrad et al.
patent: 5032651 (1991-07-01), McDaniel et al.
patent: 5155186 (1992-10-01), Hogan et al.
patent: 5183868 (1993-02-01), Nordquest
patent: 5189000 (1993-02-01), Masi et al.
patent: 5198400 (1993-03-01), Katzen et al.
patent: 5237025 (1993-08-01), Benham et al.
patent: 5330950 (1994-07-01), Hsieh
patent: 5401816 (1995-03-01), Hsieh et al.
patent: 5508362 (1996-04-01), Rollmann et al.
patent: 5648439 (1997-07-01), Bergmeister et al.
patent: 5654249 (1997-08-01), Rollmann et al.
patent: 5723399 (1998-03-01), Takemoto et al.
patent: 6096679 (2000-08-01), Lonfils et al.
patent: 6174981 (2001-01-01), Bergmeister et al.
patent: 6194528 (2001-02-01), Debras
patent: 6204346 (2001-03-01), Bergmeister et al.
patent: 6214947 (2001-04-01), Debras et al.
patent: 6245869 (2001-06-01), Debras et al.
Benham Elizabeth A.
Geerts Rolf L.
McDaniel Max P.
Shveima Joseph S.
Smith James L.
Lu Caixia
Phillips Petroleum Company
Womble Carlyle Sandridge & Rice PLLC
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