Polymerization catalyst system using...

Details Polymerization catalyst system using... Polymerization catalyst system using...

2007-01-31

2008-12-30

Choi, Ling-Siu (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S124200, C526S124300, C526S125300

Reexamination Certificate

active

07470764

ABSTRACT:
It has been discovered that using n-butylmethyldimethoxysilane (BMDS) as an external electron donor for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films with improved properties. The catalyst systems of the invention provide for controlled chain defects/defect distribution and thus a regulated microtacticity. Consequently, the curve of storage modulus (G′) v. temperature is shifted such that the film achieves the same storage modulus at a lower temperature enabling faster throughput of polypropylene film through a high-speed tenter.

REFERENCES:
patent: 5891817 (1999-04-01), Shamshoum et al.
patent: 6090325 (2000-07-01), Wheat et al.
patent: 7189788 (2007-03-01), Machida et al.

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