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

1989-09-14

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

051624427

ABSTRACT:
In a process for producing granular propylene block copolymers 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 conducting the second step in the presence of a granular propylene homopolymer added thereby to produce granular propylene copolymers endowed with an improved granulometric properties such as lowered tackiness and thus improving flowing characteristics.

REFERENCES:
patent: 3354239 (1967-11-01), Short
patent: 3530107 (1970-09-01), Yoshioka et al.
patent: 3531446 (1970-09-01), Sommer et al.
patent: 3974236 (1976-08-01), Koga et al.
patent: 4454299 (1984-06-01), Schweier et al.
patent: 4483966 (1984-11-01), Suzuki et al.
patent: 4820775 (1989-04-01), Shiga et al.

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