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

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

Category

C - Chemistry, Metallurgy

Subcategory

08

Subsubcategory

F

CPC

402/581

IPC codes

C08F 210/14 (2006.01)

Type

Patent

Patent number

CA 1274943

Description

ABSTRACT OF THE DISCLOSURE 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 d?/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 d?/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.

Application Number

545624

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