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US5382631A
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Linear ethylene interpolymer blends of interpolymers having narrow molecular weight and composition distributions
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1993-06-04
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Granted: 1995-01-17
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Expires: 2013-06-04
Abstract
Abstract Linear interpolymer blends are disclosed. The blends are made from components having a narrow molecular weight distribution (e.g. Mw/Mn≦3) and a narrow composition distribution (e.g. CDBI>50%). The blend components of the blend can all have the same molecular weight but different comonomer contents, the same comonomer content but different molecular weights, or comonomer contents which increase with molecular weight. The blends have either Mw/Mn>3 and/or CDBI<50%, and combinations of each, and can be bimodal with respect to either or both molecular weight and/or comonomer content. The blends are generally free of blend components having both a higher average molecular weight and a lower average comonomer content than another blend component. The blends can have improved mechanical, physical and/or chemical properties. Single or multilayer films having enhanced physical properties are made from the blends. Also, the interpolymer blends of this invention can be blended or coextruded with other polymers to further enhance processability of and the physical characteristics of the blends.
Inventors
- 👤 Ferdinand C. Stehling
- 👤 Charles S. Speed
- 👤 Howard C. Welborn, Jr., deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:42
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16; C08L2205/00; C08L2205/02; C08L2205/025; C08L2314/00; C08L2314/06
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
108 words
A polymer blend comprising: a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one alpha olefin comonomer, each component having a a different average molecular weight, Mw/Mn≦3, a density in the range of 0.88 to less than 0.940 g/cm 3 and a composition distribution breadth index of at least 50%; said blend being essentially free of blend components having both a higher average molecular weight and a lower average comonomer content than that of any other components; and said blend has a density in the range of from about 0.88 g/cm 3 to less than 0.900 g/cm 3 and a Mw/Mn>3.
Claim 2
Dependent Claim
108 words
A polymer blend comprising: a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one alpha olefin comonomer, each component having a a different average molecular weight, Mw/Mn≦3, a density in the range of 0.88 to less than 0.940 g/cm 3 and a composition distribution breadth index of at least 50%; said blend being essentially free of blend components having both a higher average molecular weight and a lower average comonomer content than that of any other components; and said blend has a density in the range of from about 0.88 g/cm 3 to less than 0.900 g/cm 3 and a Mw/Mn>3.
Claim 3
Dependent Claim
38 words
The blend in accordance with claim 1, wherein said blend components have an alpha-olefin comonomer content in the range of 1 to 30 mole percent and an ethylene content in the range of 99 to 70 mole percent.
Claim 4
Dependent Claim
29 words
The blend in accordance with claim 1, wherein said blend components are selected from the group consisting of: poly(ethylene-co-alpha-olefin) plastomers; very low density linear polyethylenes; linear, low density polyethylenes.
Claim 5
Dependent Claim
21 words
The blend in accordance with claim 1, wherein the blend components have essentially the same comonomer content and different molecular weights.
Claim 6
Dependent Claim
22 words
The blend in accordance with claim 1, wherein the molecular weights and the comonomer contents of the blend components are both different.
Claim 7
Dependent Claim
23 words
The blend in accordance with claim 1, wherein the value of Mw/Mn for each blend component is less than or equal to 2.7.
Claim 8
Dependent Claim
22 words
The blend in accordance with claim 1, wherein the composition distribution breadth index for each blend component is greater than about 70%.
Claim 9
Dependent Claim
94 words
A polymer film comprising at least one layer, said layer comprising a blend of a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each having a different average molecular weight, a Mw/Mn≦3, a density in the range of from about 0.88 g/cm 3 to about 0.94 g/cm 3 , and a CDBI greater than 50% said blend being essentially free of components having both a higher average molecular weight and a lower average comonomer content than that of any other component and a Mw/Mn>3.
Claim 10
Dependent Claim
94 words
A polymer film comprising at least one layer, said layer comprising a blend of a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each having a different average molecular weight, a Mw/Mn≦3, a density in the range of from about 0.88 g/cm 3 to about 0.94 g/cm 3 , and a CDBI greater than 50% said blend being essentially free of components having both a higher average molecular weight and a lower average comonomer content than that of any other component and a Mw/Mn>3.
Claim 11
Dependent Claim
11 words
The film of claim 8 wherein said components have a CDBI>60%.
Claim 12
Dependent Claim
13 words
The film of claim 8 wherein said film consists essentially of said layer.
Claim 13
Dependent Claim
36 words
The film in accordance with claim 8 wherein said components have an alpha-olefin content in the range of 1 to 30 mole percent and an ethylene content in the range of 99 to 70 mole percent.
Claim 14
Dependent Claim
86 words
A polymer blend comprising a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each having a different average molecular weight, a density in the range of from 0.88 g/cm 3 to 0.940 g/cm 3 , a Mw/Mn≦3 and a CDBI greater than 50%; said blend being essentially free of said components having both a higher average molecular weight and a lower average comonomer content than that of any other component and said blend having a Mw/Mn>3.
Claim 15
Dependent Claim
86 words
A polymer blend comprising a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each having a different average molecular weight, a density in the range of from 0.88 g/cm 3 to 0.940 g/cm 3 , a Mw/Mn≦3 and a CDBI greater than 50%; said blend being essentially free of said components having both a higher average molecular weight and a lower average comonomer content than that of any other component and said blend having a Mw/Mn>3.
Claim 16
Dependent Claim
17 words
The blend of claim 12 wherein said blend has a density greater than 0.88 g/cm 3 .
Claim 17
Dependent Claim
14 words
The blend of claim 12 wherein said components have a CDBI greater than 60%.
Claim 18
Dependent Claim
13 words
A film having at least one layer comprising said blend of claim 12.
Claim 19
Dependent Claim
109 words
A polymer blend composition comprising: a plurality of linear at least partially crystalline ethylene interpolymers comprising ethylene and at least one α-olefin comonomer, each of said components having a different average molecular weight, a Mw/Mn≦3, a CDBI of at least 50% and a density greater than or equal to 0.88 to about 0.915 g/cm 3 ; the composition having a density in the range of greater than or equal to 0.88 g/cm 3 to about 0.915 g/cm 3 and a Mw/Mn>3; wherein the composition is essentially free of blend components having both a higher average molecular weight and a lower average comonomer content than that of any other component.
Claim 20
Dependent Claim
109 words
A polymer blend composition comprising: a plurality of linear at least partially crystalline ethylene interpolymers comprising ethylene and at least one α-olefin comonomer, each of said components having a different average molecular weight, a Mw/Mn≦3, a CDBI of at least 50% and a density greater than or equal to 0.88 to about 0.915 g/cm 3 ; the composition having a density in the range of greater than or equal to 0.88 g/cm 3 to about 0.915 g/cm 3 and a Mw/Mn>3; wherein the composition is essentially free of blend components having both a higher average molecular weight and a lower average comonomer content than that of any other component.
Claim 21
Dependent Claim
35 words
The composition of claim 16 wherein said components have an α-olefin comonomer content in the range of 1 to 30 mole percent and an ethylene content in the range of 99 to 70 mole percent.
Claim 22
Dependent Claim
14 words
The composition of claim 16 wherein said components have essentially the same comonomer content.
Claim 23
Dependent Claim
17 words
The composition of claim 16 wherein said components have both a different molecular weight and comonomer content.
Claim 24
Dependent Claim
19 words
The composition of claim 16 wherein each of said components have a Mw/Mn less than or equal to 2.5.
Claim 25
Dependent Claim
17 words
The composition of claim 16 wherein each of said components have a CDBI greater than about 60%.
Claim 26
Dependent Claim
16 words
The composition of claim 16 wherein each of said components have a CDBI greater than 70%.
Claim 27
Dependent Claim
18 words
The composition of claim 16 wherein at least one of said components has a CDBI greater than 70%.
Claim 28
Dependent Claim
27 words
The composition of claim 16 wherein said components consist of at least one of the group of very low density linear polyethylenes and linear low density polyethylenes.
Claim 29
Dependent Claim
17 words
The composition of claim 16 wherein said components have a Mw/Mn≦2.5 and a CDBI greater than 70%.
Claim 30
Dependent Claim
108 words
A polymer blend composition comprising: a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one α-olefin comonomer, each of said components having a different average molecular weight, a Mw/Mn≦3, a CDBI greater than 50% and a density greater than or equal to 0.88 g/cm 3 ; said composition having a density in the range of about 0.88 g/cm 3 to about 0.940 g/cm 3 , a Mw/Mn>3 and a CDBI greater than 50%; wherein the composition is essentially free of said components having both a higher average molecular weight and a lower average comonomer content than that of any other component.
Claim 31
Dependent Claim
108 words
A polymer blend composition comprising: a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one α-olefin comonomer, each of said components having a different average molecular weight, a Mw/Mn≦3, a CDBI greater than 50% and a density greater than or equal to 0.88 g/cm 3 ; said composition having a density in the range of about 0.88 g/cm 3 to about 0.940 g/cm 3 , a Mw/Mn>3 and a CDBI greater than 50%; wherein the composition is essentially free of said components having both a higher average molecular weight and a lower average comonomer content than that of any other component.
Claim 32
Dependent Claim
35 words
The composition of claim 26 wherein said components have an α-olefin comonomer content in the range of 1 to 30 mole percent and an ethylene content in the range of 99 to 70 mole percent.
Claim 33
Dependent Claim
18 words
The composition of claim 26 wherein said components have essentially the same comonomer content and different molecular weights.
Claim 34
Dependent Claim
19 words
The composition of claim 26 wherein each of said components have a Mw/Mn less than or equal to 2.5.
Claim 35
Dependent Claim
17 words
The composition of claim 26 wherein each of said components have a CDBI greater than about 60%.
Claim 36
Dependent Claim
16 words
The composition of claim 26 wherein each of said components have a CDBI greater than 70%.
Claim 37
Dependent Claim
108 words
A polymer blend composition comprising: a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one C 3 -C 12 α-olefin comonomer, each of said interpolymers having a different average molecular weight, a Mw/Mn≦3, a CDBI greater than 50% and a density greater than or equal to 0.88 g/cm 3 ; and a high density polyethylene component; said composition having a density greater than or equal to 0.88 g/cm 3 , and a Mw/Mn>3; wherein the composition is essentially free of said components having both a higher average molecular weight and a lower average comonomer content than that of any other component.
Claim 38
Dependent Claim
108 words
A polymer blend composition comprising: a plurality of linear at least partially crystalline ethylene interpolymer components comprising ethylene and at least one C 3 -C 12 α-olefin comonomer, each of said interpolymers having a different average molecular weight, a Mw/Mn≦3, a CDBI greater than 50% and a density greater than or equal to 0.88 g/cm 3 ; and a high density polyethylene component; said composition having a density greater than or equal to 0.88 g/cm 3 , and a Mw/Mn>3; wherein the composition is essentially free of said components having both a higher average molecular weight and a lower average comonomer content than that of any other component.
Claim 39
Dependent Claim
16 words
The composition of claim 32 wherein said interpolymer components have a CDBI of at least 60%.
Claim 40
Dependent Claim
20 words
The composition of claim 32 wherein at least one of said interpolymer components has a CDBI of at least 70%.
Claim 41
Dependent Claim
24 words
The composition of claim 32 wherein the composition has a density in the range of 0.88 g/cm 3 to about 0.940 g/cm 3 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-16 | 1998-07-18 | 1999-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-16 | 2002-07-18 | 2003-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-16 | 2006-07-18 | 2007-01-17 | $7700.00 | Window Closed / Lapsed |