Production of modified polypropylenes

Details Production of modified polypropylenes Production of modified polypropylenes

Filed on

1979-11-19

Date issued

1981-09-22

Examiner

Michl, Paul R.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

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

Other Related Categories

525245, 525323, C08F29708

Type

Patent

Status

active

Patent number

042911389

Description

ABSTRACT:
A modified polypropylene having improved impact resistance is obtained by producing, in the presence of a stereoregular polymerization catalyst and in three steps, two types of polypropylene blocks formed stepwise at different temperatures and then poly(ethylene or ethylene/propylene) block, the polymerization temperatures employed and the quantities of polymers produced in each step being in specific ranges.

REFERENCES:
patent: 4066718 (1978-01-01), Saito

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