Process for producing a propylene block copolymer

Details Process for producing a propylene block copolymer Process for producing a propylene block copolymer

1994-07-26

1995-11-21

Seccuro, Jr., Carman J.

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

Synthetic resins

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

525243, 525247, 525323, 525268, 526 74, 526901, C08F29708

Patent

active

054688108

ABSTRACT:
A propylene block copolymer having a high rigidity and an excellent impact strength is produced by (1) first polymerizing propylene or a mixture of propylene and another ethylenically unsaturated hydrocarbon monomer in the presence of a catalyst comprising a Ti-containing solid component (A), an organic Al compound-containing component (B) and an alkoxyl silicon compound-containing component (C), and (2) second copolymerizing, in a gas phase, propylene and another ethylenically unsaturated hydrocarbon monomer in the presence of the first crystalline polymer of step (1) by re-using the catalyst of first polymerization, and in the presence of a saturated hydrocarbon with 6 or more carbon atoms, thereby forming an elastomeric fraction incorporated into the crystalline polymeric fraction.

REFERENCES:
patent: 4363901 (1982-12-01), Kikuta et al.
patent: 4390669 (1983-06-01), Morita et al.
patent: 4739015 (1988-04-01), Toyota et al.
patent: 4740551 (1988-04-01), Foster
patent: 4760113 (1988-07-01), Chiba et al.
patent: 4882380 (1989-11-01), Ficker et al.
patent: 4978722 (1990-12-01), Goko et al.

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