초록 ▼

A high-temperature high-pressure process for producing an ethylene/.alpha.-olefin copolymer is provided in which a saturated hydrocarbon of 4 or less carbons is injected to an unreacted monomer mixture fed to a separator in a high-pressure recycling system. This process enables stable running of the

A high-temperature high-pressure process for producing an ethylene/.alpha.-olefin copolymer is provided in which a saturated hydrocarbon of 4 or less carbons is injected to an unreacted monomer mixture fed to a separator in a high-pressure recycling system. This process enables stable running of the production apparatus for a long term without clogging of the tubing in the high-pressure recycling system.

대표청구항 ▼

[ What is claimed is:] [1.] A process for producing an ethylene/.alpha.-olefin copolymer comprising steps of copolymerizing ethylene with an .alpha.-olefin of three or more carbons in a reactor in the presence of an olefin polymerization metallocene catalyst at a reaction pressure ranging from 300 t

[ What is claimed is:] [1.] A process for producing an ethylene/.alpha.-olefin copolymer comprising steps of copolymerizing ethylene with an .alpha.-olefin of three or more carbons in a reactor in the presence of an olefin polymerization metallocene catalyst at a reaction pressure ranging from 300 to 4000 kgf/cm.sup.2 at a reaction temperature ranging from the melting point of the copolymer to 300.degree. C.; reducing the pressure of the reaction product to 40-300 kgf/cm.sup.2 ; separating an unreacted monomer mixture from the copolymer by a high-pressure separator; separating an entrained copolymer from the unreacted monomer mixture by a separator in a high-pressure recycling system to recover unreacted monomer mixture; and feeding the recovered unreacted monomer mixture together with the starting ethylene and .alpha.-olefin to the reactor, wherein a saturated hydrocarbon of four or less carbons having a density lower than that of the unreacted monomer mixture (hereinafter referred to as a "low-density saturated hydrocarbon") is allowed to coexist in the high-pressure separator.