Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Reexamination Certificate
2006-09-19
2006-09-19
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
07109143
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.
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NERAC Abstract of EP 576,413 A1, Dec. 29, 1993.
NERAC Abstract of EP 658577 B1, Jul. 16, 1997.
Blackmon Kenneth Paul
Rauscher David J.
Wallace Michael Ray
Choi Ling-Sui
Fina Technology, Inc.
Krueger Tenley R.
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