Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1996-11-07
1999-02-09
Bell, Mark L.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502120, 502126, 526139, B01J 3100, B01J 3700, C08F 402, C08F 460
Patent
active
058694188
ABSTRACT:
Olefins or mixtures of olefins, particularly propene or mixtures of propene advantageously with ethene, can be polymerized using a Ziegler-Natta catalyst system containing, besides a transition-metal-based procatalyst and cocatalyst which is an organometallic compound, a compound particularly suited for controlling the stereospecificity of the produced polymer. Such a compound called an external donor may also have other effects. By using an acetal derivative of an aldehyde that has two ether groups for this purpose, advantageously selected from the group of dialkoxyphenylalkanes, e.g., dimethoxyphenylpropane, a good stereospecificity of the product is attained combined with the high hydrogen sensitivity of the catalyst system, whereby the use of hydrogen as the chain transfer agent offers an easy control method of the molecular weight of the product by means of adjusting the amount of hydrogen available in the polymerization reaction. The acetal derivative is a compound according to formula (III): ##STR1## wherein R is C.sub.1-4 alkyl group, R.sup.1 and R.sup.2 are the same or different and each is a hydrocarbon group or a group which can together form a ring, R.sup.3 is hydrogen or a hydrocarbon group. If with the acetal derivative donor is used a clearly less hydrogen sensitive donor, e.g., alkoxysilanes, much broader MWD's of the product are achieved.
REFERENCES:
patent: 4246383 (1981-01-01), Gessell
patent: 4400303 (1983-08-01), Martin
patent: 4701505 (1987-10-01), Fujii et al.
patent: 4762898 (1988-08-01), Matsuura et al.
patent: 4829034 (1989-05-01), Iiskolan et al.
patent: 4927797 (1990-05-01), Ewen
patent: 4971937 (1990-11-01), Albizzati et al.
patent: 4981930 (1991-01-01), Funabashi et al.
patent: 5135899 (1992-08-01), Garoff et al.
patent: 5147839 (1992-09-01), Fujital et al.
patent: 5177043 (1993-01-01), Koyama et al.
patent: 5234879 (1993-08-01), Garoff et al.
patent: 5496783 (1996-03-01), Chauvin et al.
patent: 5556822 (1996-09-01), Jung et al.
Chemical Abstracts Index, No. 18231-08-8.
Chemical Abstracts Index, No. 129228-26-8.
Bjaland Ann Britt
Harkonen Mika
Iiskola Eero
Jaaskelainen Pirjo
Leinonen Timo
Bell Mark L.
Borealis Holding A/S
Pasterczyk J.
LandOfFree
Stereospecific catalyst system for polymerization of olefins does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stereospecific catalyst system for polymerization of olefins, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereospecific catalyst system for polymerization of olefins will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1948347