Low density copolymer composition of two ethylene-.alpha.-olefin copolymers
First Claim
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1. An ethylene-α
- -olefin copolymer composition excellent in transparency and strength and having a density of 0.915 to 0.929 g/cm3, a melt index of 0.02 to 50 g/10 min. and a melt flow ratio of 35 to 250, which comprises 10 to 70% by weight of an ethylene-α
-olefin copolymer A and 90 to 30% by weight of an ethylene-α
-olefin copolymer B;
said copolymer A having a higher molecular weight than copolymer B and being a copolymer of ethylene and an α
-olefin of 3 to 18 carbon atoms and having a density of 0.895 to 0.935 g/cm3, an intrinsic viscosity of 1.2 to 6.0 dl/g, the number of short chain branching per 1000 carbon atoms (hereinafter abbreviated as "S.C.B.") of 7 to 40 and a (weight average molecular weight)/(number average molecular weight) value of 2 to 10;
said copolymer B being a copolymer of ethylene and an α
-olefin of 3 to 18 carbon atoms and having a density of 0.910 to 0.955 g/cm3, an intrinsic viscosity of 0.3 to 1.5 dl/g, S.C.B. of 5 to 35 and a (weight average molecular weight)/(number average molecular weight) value of 2 to 10;
said copolymer A and said copolymer B being selected in order to satisfy a condition that (S.C.B. of said copolymer A)/(S.C.B. of said copolymer B) is 0.6 to 1.7.
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Abstract
An ethylene-α-olefin copolymer composition comprising two ethylene-α-olefin copolymers which are different in density, intrinsic viscosity and the number of short chain branching per 1000 carbon atoms. Extrusion processed materials, injection molded materials and films obtained from said composition are excellent in strength.
189 Citations
23 Claims
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1. An ethylene-α
- -olefin copolymer composition excellent in transparency and strength and having a density of 0.915 to 0.929 g/cm3, a melt index of 0.02 to 50 g/10 min. and a melt flow ratio of 35 to 250, which comprises 10 to 70% by weight of an ethylene-α
-olefin copolymer A and 90 to 30% by weight of an ethylene-α
-olefin copolymer B;
said copolymer A having a higher molecular weight than copolymer B and being a copolymer of ethylene and an α
-olefin of 3 to 18 carbon atoms and having a density of 0.895 to 0.935 g/cm3, an intrinsic viscosity of 1.2 to 6.0 dl/g, the number of short chain branching per 1000 carbon atoms (hereinafter abbreviated as "S.C.B.") of 7 to 40 and a (weight average molecular weight)/(number average molecular weight) value of 2 to 10;
said copolymer B being a copolymer of ethylene and an α
-olefin of 3 to 18 carbon atoms and having a density of 0.910 to 0.955 g/cm3, an intrinsic viscosity of 0.3 to 1.5 dl/g, S.C.B. of 5 to 35 and a (weight average molecular weight)/(number average molecular weight) value of 2 to 10;
said copolymer A and said copolymer B being selected in order to satisfy a condition that (S.C.B. of said copolymer A)/(S.C.B. of said copolymer B) is 0.6 to 1.7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- -olefin copolymer composition excellent in transparency and strength and having a density of 0.915 to 0.929 g/cm3, a melt index of 0.02 to 50 g/10 min. and a melt flow ratio of 35 to 250, which comprises 10 to 70% by weight of an ethylene-α
-
14. A composition of copolymers of ethylene and an α
- -olefin of 3 to 18 carbon atoms, having first and second component groups, said first component group having a higher molecular weight than said second component group, having the following properties;
(1) density of 0.915 to 0.929 g/cm3, (2) intrinsic viscosity [η
] of 0.7 to 4.0 dl/g,(3) melt index of 0.02 to 50 g/10 min., (4) S.C.B. being 5 to 45, (5) [η
]/[η
]l namely g.sub.η
* being at least 0.8, where [η
]l is an intrinsic viscosity of a linear polyethylene having the same weight average molecular weight measured by a light scattering method,(6) (S.C.B. of the first component group)/(S.C.B. of the second component group) being 0.6 to 0.8 where the two component groups are prepared by consolidating fractions obtained by column fractionation in two portions of lower and higher molecular weight components, said portions being selected so that the weight ratio of the two portions corresponds to the weight ratio of lower and higher molecular weight components calculated from the gel permeation chromotography curve, (7) the second components have a density of 0.910 to 0.955 g/cm3, an intrinsic viscosity of 0.3 to 1.5 dl/g and S.C.B. of 5 to 35, (8) the first components have a density of 0.895 to 0.935 g/cm3, an intrinsic viscosity of 1.2 to 6.0 dl/g and S.C.B. of 7 to 40, and (9) the second components are 30 to 90% by weight and the first components are 70 to 10% by weight. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
- -olefin of 3 to 18 carbon atoms, having first and second component groups, said first component group having a higher molecular weight than said second component group, having the following properties;
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Current AssigneeSumitomo Chemical Company Limited
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Original AssigneeSumitomo Chemical Company Limited
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InventorsKitamura, Shuji, Kotani, Kozo, Ogawa, Tadatoshi, Nakae, Kiyohiko, Fukushima, Nobuo, Hosono, Hidekazu
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Primary Examiner(s)Levin, Stanford M.
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Application NumberUS06/342,428Time in Patent Office785 DaysField of Search525/240US Class Current525/240CPC Class CodesC08F 2/001 Multistage polymerisation p...C08F 210/16 Copolymers of ethene with a...C08L 2205/02 containing two or more poly...C08L 23/0815 Copolymers of ethene with a...C08L 2666/06 Homopolymers or copolymers ...Y10T 428/24992 Density or compression of c...
