Process for producing 4-methylpentene-1 copolymer and resin comp

Details Process for producing 4-methylpentene-1 copolymer and resin comp Process for producing 4-methylpentene-1 copolymer and resin comp

1987-09-04

1989-01-31

Seccuro, 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...

525191, 525198, 525240, 525268, 525270, 5263483, 5263484, 528481, 528503, C08L 2318, C08F21014

Patent

active

048016500

ABSTRACT:
A process for producing a 4-methylpentene-1 copolymer comprising copolymerizing 4-methylpentene-1 with other .alpha.-olefin in a hydrocarbon solvent in the presence of a Ziegler-Natta catalyst and a resin composition containing the 4-methylpentene-1 copolymer are disclosed. The copolymerization comprises a first stage in which (A) a homopolymer or random copolymer of 4-methylpentene-1 having an .alpha.-olefin content of not more than 3 mol % and an intrinsic viscosity of at least 2.5 dl/g is prepared and a second stage in which (B) a random copolymer having an .alpha.-olefin content higher than that of the polymer (A) and no higher than 9 mol % and an intrinsic viscosity of at least 2.5 dl/g is prepared, and the produced copolymer insoluble in the solvent is separated to recover a 4-methylpentene-1 copolymer containing from 5 to 80% by weight of the polymer (A). The process produces a solvent-insoluble copolymer in an increased yield without impairing transparency of the copolymer.

REFERENCES:
patent: 3692712 (1972-09-01), Brooks
patent: 4146591 (1979-03-01), Fuki et al.
patent: 4166057 (1979-08-01), Takemori
patent: 4645797 (1987-02-01), Suga et al.
patent: 4659792 (1987-04-01), Kashiwa et al.
patent: 4727113 (1988-02-01), Kohyama et al.
European Search Report.

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