US4981760A
Expired / Lapsed
US
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Ethylene-alpha-olefin copolymer and films obtained therefrom
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1989-07-11
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Granted: 1991-01-01
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Expires: 2009-07-11
Abstract
Abstract An ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 3 to 10 carbon atoms, the copolymer having an α-olefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, i.e., ΔHb/ΔHa, being from 0.03 to 2.0. The copolymer provides a film exhibiting excellent physical properties required for packaging film.
Inventors
- 👤 Yukio Naito
- 👤 Kohzoh Miyazaki
- 👤 Yuji Gotoh
- 👤 Masashi Hamba
- 👤 Akio Imai
- 👤 Kiyoyuki Sugimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:52
CPC Classifications
C; C08; C08F; C08F210/00; C08J; C08J5/00; C08J5/18; C08F210/02; C08F210/16; C08F297/00; C08F297/06; C08F297/08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08F110/00; C08F110/02; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L23/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
An ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), αHb, to an endotherm at the endothermic peak (a), αHa, being from 0.03 to 2.0.
Claim 2
Dependent Claim
125 words
An ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), αHb, to an endotherm at the endothermic peak (a), αHa, being from 0.03 to 2.0.
Claim 3
Dependent Claim
128 words
A film comprising an ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an αolefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 4
Dependent Claim
128 words
A film comprising an ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an αolefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 5
Dependent Claim
143 words
A composite film composed of a base having provided on at least one surface thereof a film comprising an ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 6
Dependent Claim
143 words
A composite film composed of a base having provided on at least one surface thereof a film comprising an ethylene-α-olefin copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 1.0 to 8.0 mol %, a density of from 0.900 to 0.930 g/cm 3 , and a melt flow rate of from 0.1 to 100 g/10 min., the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 7
Dependent Claim
73 words
A low-density polyethylene film whose programed-temperature thermogram as determined directly for the film state with a differential scanning calorimeter shows an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 8
Dependent Claim
73 words
A low-density polyethylene film whose programed-temperature thermogram as determined directly for the film state with a differential scanning calorimeter shows an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 9
Dependent Claim
88 words
A composite film composed of a base having provided on at least one surface thereof a low-density polyethylene film whose programed-temperature thermogram as determined directly for the film state with a differential scanning calorimeter shows an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 10
Dependent Claim
88 words
A composite film composed of a base having provided on at least one surface thereof a low-density polyethylene film whose programed-temperature thermogram as determined directly for the film state with a differential scanning calorimeter shows an endothermic peak (a) in a range of from 75° to 100° C. and an endothermic peak (b) in a range of from 120° to 140° C., with the ratio of an endotherm at the endothermic peak (b), ΔHb, to an endotherm at the endothermic peak (a), ΔHa, being from 0.03 to 2.0.
Claim 11
Dependent Claim
194 words
A polyethylene mixture having a density of from 0.900 to 0.930 g/cm 3 and a melt flow rate of from 0.1 to 100 g/10 min., which comprises (I) from 60 to 99 parts by weight of an ethylene-α-olefin random copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 2.0 to 10 mol % and a density of from 0.895 to 0.915 g/cm 3 , the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak in a range of from 75° to 100° C., with the ratio of an endotherm at said peak to the total endotherm being at least 0.8, and (II) from 1 to 40 parts by weight of a high-density polyethylene having a density of at least 0.945 g/cm 3 , the programed-temperature thermogram of said high-density polyethylene as determined with a differential scanning calorimeter after being completely melted and allowed to cool showing an endothermic peak at 125° C. or higher, wherein the sum of (I) and (II) amounts to 100 parts by weight.
Claim 12
Dependent Claim
194 words
A polyethylene mixture having a density of from 0.900 to 0.930 g/cm 3 and a melt flow rate of from 0.1 to 100 g/10 min., which comprises (I) from 60 to 99 parts by weight of an ethylene-α-olefin random copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 2.0 to 10 mol % and a density of from 0.895 to 0.915 g/cm 3 , the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak in a range of from 75° to 100° C., with the ratio of an endotherm at said peak to the total endotherm being at least 0.8, and (II) from 1 to 40 parts by weight of a high-density polyethylene having a density of at least 0.945 g/cm 3 , the programed-temperature thermogram of said high-density polyethylene as determined with a differential scanning calorimeter after being completely melted and allowed to cool showing an endothermic peak at 125° C. or higher, wherein the sum of (I) and (II) amounts to 100 parts by weight.
Claim 13
Dependent Claim
196 words
A film comprising a polyethylene mixture having a density of from 0.900 to 0.930 g/cm 3 and a melt flow rate of from 0.1 to 100 g/10 min., which comprises (I) from 60 to 99 parts by weight of an ethylene-α-olefin random copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 2.0 to 10 mol % and a density of from 0.895 to 0.915 g/cm 3 , the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak in a range of from 75° to 100° C., with the ratio of an endotherm at said peak to the total endotherm being at least 0.8, and (II) from 1 to 40 parts by weight of high-density polyethylene having a density of at least 0.945 g/cm 3 , the programed-temperature thermogram of said high-density polyethylene as determined with a differential scanning calorimeter after being completely melted and allowed to cool showing an endothermic peak at 125° C. or higher, wherein the sum of (I) and (II) amounts to 100 parts by weight.
Claim 14
Dependent Claim
196 words
A film comprising a polyethylene mixture having a density of from 0.900 to 0.930 g/cm 3 and a melt flow rate of from 0.1 to 100 g/10 min., which comprises (I) from 60 to 99 parts by weight of an ethylene-α-olefin random copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 2.0 to 10 mol % and a density of from 0.895 to 0.915 g/cm 3 , the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak in a range of from 75° to 100° C., with the ratio of an endotherm at said peak to the total endotherm being at least 0.8, and (II) from 1 to 40 parts by weight of high-density polyethylene having a density of at least 0.945 g/cm 3 , the programed-temperature thermogram of said high-density polyethylene as determined with a differential scanning calorimeter after being completely melted and allowed to cool showing an endothermic peak at 125° C. or higher, wherein the sum of (I) and (II) amounts to 100 parts by weight.
Claim 15
Dependent Claim
212 words
A composite film composed of a base having provided on at least one surface thereof a film comprising a polyethylene mixture having a density of from 0.900 to 0.930 g/cm 3 and a melt flow rate of from 0.1 to 100 g/10 min., which comprises (I) from 60 to 99 parts by weight of an ethylene-α-olefin random copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 2.0 to 10 mol % and a density of from 0.895 to 0.915 g/cm 3 , the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak in a range of from 75° to 100° C., with the ratio of an endotherm at said peak to the total endotherm being at least 0.8, and (II) from 1 to 40 parts by weight of a high-density polyethylene having a density of at least 0.945 g/cm 3 , the programed-temperature thermogram of said high-density polyethylene as determined with a differential scanning calorimeter after being completely melted and allowed to cool showing an endothermic peak at 125° C. or higher, wherein the sum of (I) and (II) amounts to 100 parts by weight.
Claim 16
Dependent Claim
212 words
A composite film composed of a base having provided on at least one surface thereof a film comprising a polyethylene mixture having a density of from 0.900 to 0.930 g/cm 3 and a melt flow rate of from 0.1 to 100 g/10 min., which comprises (I) from 60 to 99 parts by weight of an ethylene-α-olefin random copolymer comprising ethylene and an α-olefin having from 4 to 10 carbon atoms, the copolymer having an α-olefin content of from 2.0 to 10 mol % and a density of from 0.895 to 0.915 g/cm 3 , the programed-temperature thermogram of said copolymer as determined with a differential scanning calorimeter after being completely melted and then gradually cooled showing an endothermic peak in a range of from 75° to 100° C., with the ratio of an endotherm at said peak to the total endotherm being at least 0.8, and (II) from 1 to 40 parts by weight of a high-density polyethylene having a density of at least 0.945 g/cm 3 , the programed-temperature thermogram of said high-density polyethylene as determined with a differential scanning calorimeter after being completely melted and allowed to cool showing an endothermic peak at 125° C. or higher, wherein the sum of (I) and (II) amounts to 100 parts by weight.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
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