Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Reexamination Certificate
2007-01-16
2007-01-16
Choi, Ling-Sui (Department: 1713)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
C502S103000, C502S115000, C526S124300, C526S351000, C526S124200, C526S124100
Reexamination Certificate
active
11359818
ABSTRACT:
It has been discovered that using di-sec-butyldialkoxysilanes, such as di-sec-butyldimethoxysilane (DSBDMS), as external electron donors for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films with improved properties and processing. The catalyst systems of the invention provide high activity, high bulk density, moderate hydrogen response, moderate donor response and high polydispersity (MWD). Suitable di-sec-butyldialkoxysilanes have the formula (sBu)2Si(OR″)2, where R″ is independently a straight or branched alkyl group of 1–5 carbon atoms.
REFERENCES:
patent: 4107413 (1978-08-01), Giannini et al.
patent: 4115319 (1978-09-01), Scata et al.
patent: 4218339 (1980-08-01), Zucchini et al.
patent: 4220554 (1980-09-01), Scata et al.
patent: 4294721 (1981-10-01), Cecchin et al.
patent: 4298718 (1981-11-01), Mayr et al.
patent: 4328122 (1982-05-01), Monte et al.
patent: 4395360 (1983-07-01), Albizatti et al.
patent: 4439540 (1984-03-01), Cecchin et al.
patent: 4460701 (1984-07-01), Terano et al.
patent: 4473660 (1984-09-01), Albizzati et al.
patent: 4544717 (1985-10-01), Mayr et al.
patent: 4562173 (1985-12-01), Terano et al.
patent: 4927797 (1990-05-01), Ewen
patent: 4971937 (1990-11-01), Albizzati et al.
patent: 5106807 (1992-04-01), Morini et al.
patent: 5489634 (1996-02-01), Hara et al.
patent: 5891817 (1999-04-01), Shamshoum et al.
patent: 5945366 (1999-08-01), Kataoka et al.
patent: 6133385 (2000-10-01), Shamshoum et al.
patent: 6255247 (2001-07-01), Shamshoum et al.
patent: 6323293 (2001-11-01), Shamshoum et al.
patent: 0 565 173 (1993-10-01), None
patent: 0 576 413 (1993-12-01), None
patent: 0 658 577 (1995-06-01), None
Proto et al., “Isotactic-Specific Polymerization of Propylene with Supported Catalysts in the presence of Different Modifiers”, Macromolecules, 23:11, pp. 2904-2907 (1990).
Choi Ling-Sui
Fina Technology, Inc.
Krueger Tenley R.
LandOfFree
Polymerization catalyst system using... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymerization catalyst system using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymerization catalyst system using... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3815860