Process for the preparation of polypropylene

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

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Details

C526S160000, C526S161000, C526S165000, C526S943000, C502S103000, C502S152000, C502S162000

Reexamination Certificate

active

07956148

ABSTRACT:
The present invention relates to a process for the preparation of polypropylene using a catalyst system of low porosity, the catalyst system comprising an asymmetric catalyst, wherein the catalyst system has a porosity of less than 1.40 ml/g.

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patent: WO 2004/101673 (2004-11-01), None
Hayashi, et al.,Pentad Assignments of Methine Carbon Resonances in Stereoregular Ethylene-Propylene Copolymer Based on Two-Dimensional Inadequate NMR Spectrum, Polymer Journal, vol. 20, No. 10, pp. 89-902, 1988.
Hayashi, et al.,Heptad configurational analysis of13C n.m.r. spectra in highly isotactic polypropylene, Polymer, vol. 29, pp. 138-143, Jan. 1988.
Chujo et al.,Two-site model analysis of13C n.m.r. of polypropylene polymerized by Ziegler-Natta catalyst with external alkoxysilane donors, Polymer 1994, vol. 35, No. 2, pp. 339-342.

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