Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2003-06-06
2009-12-15
Wood, Elizabeth D (Department: 1793)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S096000, C526S105000, C526S106000, C526S352000
Reexamination Certificate
active
07632901
ABSTRACT:
Methods of making supported chromium catalyst systems and processes of polymerizing ethylene using the supported chromium catalyst systems are disclosed. A method of forming a catalyst system in a polymerization reactor includes contacting a supported chromium catalyst and a metal alkyl cocatalyst by cofeeding the catalyst and cocatalyst to the reactor or feeding the catalyst and cocatalyst separately to the reactor, to form a catalyst system. The catalyst and cocatalyst are not pre-contacted prior to the feeding or cofeeding step. The catalyst system can be contacted with ethylene and optional alpha-olefin comonomer to form polyethylene.
REFERENCES:
patent: 2825721 (1958-03-01), Hogan et al.
patent: 3887494 (1975-06-01), Dietz
patent: 4182810 (1980-01-01), Willcox
patent: 4877763 (1989-10-01), McDaniel et al.
patent: 5096868 (1992-03-01), Hsieh et al.
patent: 5169815 (1992-12-01), Dawkins
patent: 5274056 (1993-12-01), McDaniel et al.
patent: 5599887 (1997-02-01), Badley et al.
patent: 6174981 (2001-01-01), Coutant et al.
patent: 6194520 (2001-02-01), Cheruvu et al.
patent: 6201077 (2001-03-01), Bergmeister et al.
patent: 6242543 (2001-06-01), Follestad et al.
patent: 6316553 (2001-11-01), McDaniel et al.
patent: 6399722 (2002-06-01), Szul et al.
patent: 6489428 (2002-12-01), Debras et al.
patent: 6524988 (2003-02-01), Speca
patent: 6586544 (2003-07-01), Szul et al.
patent: 6642324 (2003-11-01), Bergmeister et al.
patent: 6646069 (2003-11-01), Monoi et al.
patent: 6657024 (2003-12-01), Blackmon et al.
patent: 6734131 (2004-05-01), Shih et al.
patent: 6809057 (2004-10-01), Lin et al.
patent: 6825292 (2004-11-01), Reid
patent: 6831143 (2004-12-01), Britovsek et al.
patent: 6833416 (2004-12-01), Kinnan et al.
patent: 6846770 (2005-01-01), Speca
patent: 6846886 (2005-01-01), Mawson et al.
patent: 6885416 (2005-04-01), Luo et al.
patent: 7223823 (2007-05-01), Lin
patent: 2003/0232715 (2003-12-01), Katzen et al.
patent: 969525 (1975-06-01), None
patent: 26 22 755 (1977-12-01), None
patent: 0 279 890 (1988-08-01), None
patent: 1 172 381 (2002-01-01), None
patent: 1271445 (1972-04-01), None
patent: 1 405 255 (1975-09-01), None
patent: 1405255 (1975-10-01), None
patent: 1433052 (1976-04-01), None
patent: 2 073 761 (1981-10-01), None
patent: 2073761 (1981-10-01), None
patent: WO 94/21962 (1994-09-01), None
patent: WO98/057998 (1998-12-01), None
patent: WO 01/32307 (2001-05-01), None
Xia et al. “Unique polymerization kinetics obtained from simultaneous interaction of Phillips Cr(VI)Ox/SiO2 catalyst with Al-alkyl cocatalyst and ethylene monomer”, Journal of Molecular Catalysis A:Chemical 256 (2006) 301-308. no month.
Woo et al. “Ethylene Polymerization with Phillips Catalyst Co-Catalyzed with SI(i-Bu)3”, Journal of Catalysis, 123, 215-227, (1990), no month.
Marsden, C. E., “Plastics, Rubber and Composites Processing and Applications,” vol. 21, pp. 193-200, 1994.
Katzen Stanley J.
Kendrick James A.
Lin Zerong
Roger Scott T.
Speca Anthony N.
ExxonMobil Chemical Patents Inc.
Wood Elizabeth D
LandOfFree
Catalyst system and process does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Catalyst system and process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalyst system and process will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4098168