Process for producing stereoregular polymers having a narrow mol

Details Process for producing stereoregular polymers having a narrow mol Process for producing stereoregular polymers having a narrow mol

1987-05-19

1992-03-03

Smith, Edward J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

526124, 526351, 526901, C08F 234, C08F 1006

Patent

active

050934155

ABSTRACT:
Stereoregular polymers having a molecular weight distribution of less than 5.0 and an isotactic index in excess of 96 percent are produced by polymerizing an alpha-olefin having 3 to 8 carbon atoms in a low pressure gas phase fluid bed process at a temperature in excess of 80.degree. C. employing a heat stable catalyst system comprising (a) a solid catalyst component containing magnesium, titanium, halide and a polycarboxylic acid ester containing two coplanar ester groups attached to adjacent carbon atoms, as inside electron donor, (b) an organoaluminum cocatalyst, and (c) a silicon compound containing a silicon-oxygen-carbon linkage, as outside electron donor.

REFERENCES:
patent: 4535068 (1985-08-01), Job
patent: 4611038 (1986-09-01), Brun et al.

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