Process for making a propylene polymer with free-end long chain

Details Process for making a propylene polymer with free-end long chain Process for making a propylene polymer with free-end long chain

Filed on

1989-02-21

Date issued

1991-09-10

Examiner

Lipman, Bernard

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

5253338, 525383, 525386, C08F 850

Type

Patent

Status

active

Patent number

050474855

Description

ABSTRACT:
Disclosed is a process for making a normally solid, gel-free, amorphous to predominantly crystalline, propylene polymer material having free-end branches of propylene units and strain hardening elongational viscosity by peroxide decomposition of the propylene polymer material in the substantial absence of oxygen at certain temperatures for certain periods of time, and then deactivating the free radicals in the material.

REFERENCES:
patent: 3144436 (1964-08-01), Greene et al.
patent: 3887534 (1975-06-01), Baba et al.
patent: 4378451 (1983-03-01), Edwards
patent: 4451589 (1984-05-01), Morman et al.
patent: 4578430 (1986-03-01), Davison
patent: 4707524 (1987-11-01), Ehrig et al.

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