Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-12-16
2000-05-30
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526114, 526118, 526119, 526160, 526161, 526172, 526943, 526351, 502113, 502117, 502118, 502152, C08F 406, C08F 472, C08F 402
Patent
active
060692138
ABSTRACT:
It has been found that the use of at least one unsupported metallocene polymerization catalyst with at least one supported metallocene polymerization catalyst in the polymerization of olefins allows for better control of the polymerization, especially gas phase polymerization. Such a system takes advantage of the high activity of the unsupported catalyst and the stability of a supported catalyst. Additionally, the relative timing of the addition of the supported and unsupported catalysts to a reaction system can be used to control a continuous polymerization reaction by stabilizing the reactor bed with the supported catalyst prior to addition of the unsupported catalyst.
REFERENCES:
patent: 5124418 (1992-06-01), Welborn
patent: 5359015 (1994-10-01), Jejelowo
patent: 5439994 (1995-08-01), Inoue et al.
patent: 5470811 (1995-11-01), Jejelowo et al.
patent: 5516737 (1996-05-01), Jejelowo
patent: 5516848 (1996-05-01), Canich et al.
patent: 5527752 (1996-06-01), Reichle et al.
patent: 5534473 (1996-07-01), Welch et al.
patent: 5539066 (1996-07-01), Winter et al.
patent: 5614456 (1997-03-01), Mink et al.
patent: 5648428 (1997-07-01), Reddy et al.
Brady III Robert Converse
Kao Sun-Chueh
Karol Frederick John
Nemzek Thomas Lloyd
Doody P. A.
Rabago Roberto
Union Carbide Chemicals & Plastics Technology Corporation
Wu David W.
LandOfFree
Mixed catalyst system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mixed catalyst system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mixed catalyst system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1911009