Sumitomo Chemical Company, Limited

Yuki Iseki

Yasuro Suzuki

Yasutoyo Kawashima

Katsuhiro Yamada

Yoshinobu Nozue

Nobuo Oi

Tatsuhiro Nagamatsu

Tadahiro Mitsuno

Kenzo Chikanari

Tomoaki Goto

An ethylene-&#x3b1;-olefin copolymer having monomer units derived from ethylene and monomer units derived from an &#x3b1;-olefin of 3 to 20 carbon atoms, a melt flow rate (MFR) of 0.01 to 4 g/10 minutes, a density of 890 to 970 kg/m, an activation energy of flow of 50 kJ/mol or more and a molecular weight distribution measured by gel permeation chromatography of 3 or more, wherein a characteristic relaxation time (&#x3c4;) determined by a melt viscoelasticity measurement or an external haze ratio (EHR) satisfies a relationship of the following formula (1) or (2), respectively:3&#xd7;MFR+1.1&#x3e;&#x3c4;&#x3e;1.3&#xd7;MFR+1.4&#x2003;&#x2003;(1)EHR&#x2266;&#x2212;15&#xd7;log MFR+0.145&#xd7;&#x2212;47&#x2003;&#x2003;(2)

Ethylene-&#x3b1;-olefin copolymer, resin composition containing the same and molded article thereof

The object is to provide a method for producing a film excellent in a quality of odorless or free from deteriorating taste of food contained in a package of the extruded molded article by using an ethylene-&#x3b1;-olefin copolymer excellent in extrusion molding processability. This object is achieved by a method for producing an extruded molded article comprising a step of extruding a copolymer of ethylene and &#x3b1;-olefin of from 3 to 20 carbon atoms having an activation energy for melt flow of not less than 50 kJ/mol under one of the following conditions:

Method for producing an extruded molded article of ethylene polymer and the film

An ethylene-&#x3b1;-olefin copolymer comprising a repeating unit derived from ethylene and a repeating unit derived from an &#x3b1;-olefin having 3 to 20 carbon atoms, wherein a melt flow rate (MFR) is 0.01 to 100 g/10 minutes, a density is 860 to 970 kg/m, a molecular weight distribution (Mw/Mn) is 2 to 8, and a ratio (&#x3b7;*/&#x3b7;*) of a dynamic complex viscosity (&#x3b7;*) at a temperature of 190&#xb0; C. and an angular frequency of 0.1 rad/s, to a dynamic complex viscosity (&#x3b7;*) at a temperature of 190&#xb0; C. and an angular frequency of 100 rad/s is 15 to 100 is excellent in balance between mechanical strength and processability.

Ethylene-alpha-olefin copolymer

An ethylene-&#x3b1;-olefin copolymer containing monomer units derived from ethylene and monomer units of an &#x3b1;-olefin having 3 to 20 carbon atoms and having a melt flow rate of from 0.01 to 100 g/10 min, an activation energy of flow of 50 kJ/mol or more, a molecular weight distribution measured by a gel permeation chromatography of 3 or more and minute defects of 2000/mor less in number, a process for producing the copolymer, and a molding of the copolymer.

Ethylene-&#x3b1;-olefin copolymer, molding thereof and process for producing the copolymer

An ethylene-&#x3b1;-olefin copolymer containing monomer units derived from ethylene and monomer units derived from an &#x3b1;-olefin having 4 to 20 carbon atoms, and having a density of 890 to 970 kg/m, an activation energy of flow of 50 kJ/mol or more, a molecular weight distribution of 3 or more determined by a gel permeation chromatography, and the number of inflection points of 3 or less on a melting curve obtained by a differential scanning calorimetry within a temperatures ranges of from 25&#xb0;C. to an end point of melting.

Ethylene-&#x3b1;-olefin copolymer and molding thereof

A copolymer having monomer units derived from ethylene and monomer units derived from an &#x3b1;-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/mand an activation energy of flow of 50 kJ/mol or more, and satisfying specific relations among a melt complex viscosity, a melt flow rate and a characteristic relaxation time.

Ethylene-&#x3b1;-olefin copolymer

An ethylene-&#x3b1;-olefin copolymer having monomer units derived from ethylene and monomer units derived from an &#x3b1;-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/m, an activation energy of flow of 50 kJ/mol or more and a heat quantity of fusion of a cold xylene soluble part of 30 J/g or more, and satisfying specific relations among a rate of the cold xylene soluble part in the copolymer, the density, a melt flow rate and a characteristic relaxation time.

An object of the present invention is to provide an ethylene-&#x3b1;-olefin copolymer excellent in extrusion molding processability and in the balance between the appearance and impact strength. This object is achieved by a copolymer of ethylene and &#x3b1;-olefin of from 4 to 20 carbon atoms having melt flow rate (MFR; unit is g/10 minutes), melt tension at 190&#xb0; C. (MT; unit is cN), intrinsic viscosity ([&#x3b7;]; unit is dl/g), the chain length A and characteristic relaxation time at 190&#xb0; C. (&#x3c4;; unit is sec) which satisfy the specific relations.

Ethylene copolymer

The invention provides an ethylene-&#x3b1;-olefin copolymer which is superior in extrusion molding processability. The present invention is to provide a copolymer of ethylene and &#x3b1;-olefin of from 4 to 20 carbon atoms, having melt flow rate of from 1 to 100 g/10 min, an activation energy for melt flow of 60 kJ/mol or more, melt tension at 190&#xb0; C. (MT), intrinsic viscosity ([&#x3b7;]) and a chain length A which satisfy the formula (1) to (3), wherein the chain length A is a chain length at peak position of a logarithm normal distribution curve of a component having the highest molecular weight among logarithm normal distribution curves obtained by dividing a chain length distribution curve obtained by gel permeation chromatography measurement into at least two logarithm normal distribution curves.

An ethylene-based polymer resin which is obtained by copolymerizing ethylene with an &#x3b1;-olefin having 5 to 20 carbon atoms, and has a melt flow rate (MFR) measured at 190&#xb0; C. under a load of 21.18 N according to JIS K7210-1995, of not less than 0.01 g/10 min. and less than 1 g/10 min., wherein the melt flow rate and a melt tension(MT) at 190&#xb0; C. (unit: cN) of the resin satisfy a relation of the following expression (1) and an intrinsic viscosity [&#x3b7;] (unit: dL/g) and the melt flow rate of the resin satisfy a relation of the following expression (2):2&#xd7;&#x3c;3.6&#xd7;&#x2003;&#x2003;(1)1.02&#xd7;&#x3c;[&#x3b7;]&#x3c;1.50&#xd7;&#x2003;&#x2003;(2).

Ethylene-based polymer resin

An &agr;-olefin-alkenyl aromatic hydrocarbon-diene copolymer, a process for producing the copolymer, which comprises copolymerizing an &agr;-olefin, a mono-alkenyl aromatic hydrocarbon and a diene in the presence of a specific catalyst, and a molded article comprising the copolymer.

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Scarsdale, NY, United States of America

Yuki Iseki