High-rigidity ethylene-propylene copolymer and process for produ

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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Details

Other Related Categories

525323, C08F29708

Type

Patent

Status

active

Patent number

045828784

Description

ABSTRACT:
A high-rigidity, whitening-resistant ethylene-propylene copolymer is provided, which is obtained by copolymerizing propylene with ethylene at three successive stages wherein at the respective first, second and third stages, a copolymer fraction having a specified ethylene content is formed in a specified amount based on the total polymerization amount, in the presence of a catalyst obtained by reacting an organoaluminum compound (L) or a reaction product thereof with an electron donor (E) with TiCl.sub.4 ; reacting the resulting solid product (I) with an (E) and an electron acceptor; and combining the resulting solid product (II) with an (L) and an aromatic carboxylic acid ester (R), the molar ratio of (R) to (II) being specified, and in the presence of hydrogen.

REFERENCES:
patent: 4245062 (1981-01-01), Suzuki et al.
patent: 4254237 (1981-03-01), Shiga et al.
patent: 4337326 (1982-06-01), Shiga et al.

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