C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/584
C08F 10/06 (2006.01) C08F 4/64 (2006.01)
Patent
CA 1306579
ABSTRACT OF THE DISCLOSURE A process for producing polypropylene, which comprises preliminarily polymerizing 3-methylbutene-l in the presence of a catalyst system formed from [A] a solid titanium catalyst component con- taining magnesium, titanium, halogen and poly- carboxylic acid esters as essential components, [B] an organoaluminum compound, and [C] an organosilicon compound represented by the general formula RnSi(OR')4-n wherein R and R' represent a hydrocarbon group, and 0<n<4, the amount of the 3-methylbutene-l preliminarily poly- merized being 0.1 to 100 g per gram of the solid titanium catalyst, and thereafter, polymerizing propylene or copolymerizing propylene and an alpha-olefin in the presence of the catalyst used in the preliminary poly- merization to such an extent that the amount of the monomer or monomers polymerized is from 1,000 to 100,000 times the amount of the 3-methylbutene-l preliminarily polymerized. Also provided is a stretched polypropylene film having excellent see-through property with little losses of transparency or rigidity obtained by stretching polypropylene containing 1 to 1,000 weight ppm of 3- methylbutene-l polymer in at least one direction.
585597
Ishiyama Masanobu
Kioka Mamoru
Nakano Masao
Toyota Akinori
Yamada Masaya
Mitsui Chemicals Incorporated
Smart & Biggar
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