Polymerization catalyst system using...

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

2007-04-10

2007-04-10

Choi, Ling-Sui (Department: 1713)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

C502S103000, C502S116000, C502S115000, C502S133000, C502S125000, C526S128000, C526S124900, C526S125300, C526S124300, C526S124200, C526S123100, C526S351000

Reexamination Certificate

active

11243390

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: 5489634 (1996-02-01), Hara
patent: 5891817 (1999-04-01), Shamshoum et al.

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