Process for the production of polypropylene

Details Process for the production of polypropylene Process for the production of polypropylene

1990-12-12

1995-07-11

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502125, 502127, 526351, C08F 4651, C08F 4654, C08F 1006

Patent

active

054322448

ABSTRACT:
A process for the polymerization of propylene or a mixture comprising propylene and one or more alpha-olefins and, optionally, one or more diolefins comprising contacting the propylene or the mixture of olefins in at least one reaction zone, under polymerization conditions, with a catalyst system comprising (i) a solid catalyst precursor, which includes magnesium; titanium; a halogen which is chlorine, bromine, or iodine, or mixtures thereof; and a mono- or polycarboxylic acid ester; (ii) a hydrocarbylaluminum cocatalyst; and (iii) a mixture of selectivity control agents comprising a mono- or polycarboxylic acid ester and a silicon compound containing at least one silicon-oxygen-carbon linkage with the proviso that (a) the atomic ratio of aluminum to titanium is in the range of about 5 to about 300; and (b) the molar ratio of the ester to silicon compound in the mixture of selectivity control agents is at least about 1.5:1.

REFERENCES:
patent: 4069169 (1978-01-01), Toyota et al.
patent: 4234710 (1980-11-01), Moberly et al.
patent: 4329253 (1982-05-01), Goodall et al.
patent: 4414132 (1983-11-01), Goodall et al.
patent: 4563512 (1986-01-01), Goodall

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