High-rigidity ethylene-propylene copolymer and process for produ

Details High-rigidity ethylene-propylene copolymer and process for produ High-rigidity ethylene-propylene copolymer and process for produ

1984-07-25

1986-04-15

Smith, Edward J.

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

Synthetic resins

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

525323, C08F29708

Patent

active

045828784

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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