Process for producing granular propylene polymers endowed with i

Details Process for producing granular propylene polymers endowed with i Process for producing granular propylene polymers endowed with i

1992-02-26

1992-11-10

Schofer, Joseph L.

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

Synthetic resins

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

525268, 525322, 525323, 525324, C08F29708

Patent

active

051624435

ABSTRACT:
In a process for producing granular propylene block copolymers by Ziegler-Natta polymerization of an .alpha.-olefin wherein the Ziegler-Natta catalyst comprises a granular solid transition metal catalyst component and an organometal component in two steps wherein a resinous homopolymer of propylene is produced in the first step and an elastomeric copolymer of propylene with ethylene is produced in the second step, the improvement which comprises the use as the granular solid transition metal component of a mixture of the solid transition metal components, one made up substantially of particles of particle size of more than 5 microns and the other made up substantially of particles of particle size of 1 to 5 microns thereby to produce granular propylene copolymers endowed with an improved granulometric properties such as lowered tackiness and thus improved flowing characteristics. The component (B) is preferably produced from the particles for the component (A) by reducing the particle size of its particles.

REFERENCES:
patent: 3530107 (1970-09-01), Yoshioka et al.
patent: 4483966 (1984-11-01), Suzuki et al.
patent: 4547552 (1985-10-01), Toyota et al.
patent: 4820775 (1989-04-01), Shiga et al.

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