Linear ethylene interpolymer blends of interpolymers having narrow molecular weight and composition distribution
First Claim
1. A polymer blend composition comprising:
- a plurality of linear ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each component having a different average molecular weight, a Mw/Mn≦
3, a composition distribution breadth index of at least 50% and a density greater than or equal to 0.900 g/cm3 ;
the composition having a density greater than or equal to 0.900 g/cm3 and a Mw/Mn>
3;
wherein the composition is essentially free of components having a higher average molecular weight and a lower average comonomer content than that of any other components.
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Abstract
Linear ethylene 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 in a 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 or CDBI<50%, or both, and can be multimodal 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.
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Citations
40 Claims
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1. A polymer blend composition comprising:
- a plurality of linear ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each component having a different average molecular weight, a Mw/Mn≦
3, a composition distribution breadth index of at least 50% and a density greater than or equal to 0.900 g/cm3 ;
the composition having a density greater than or equal to 0.900 g/cm3 and a Mw/Mn>
3;
wherein the composition is essentially free of components having a higher average molecular weight and a lower average comonomer content than that of any other components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a plurality of linear ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each component having a different average molecular weight, a Mw/Mn≦
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9. A polymer blend comprising:
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a plurality of linear ethylene interpolymer components comprising ethylene and at least one alpha-olefin comonomer, each component having a different average molecular weight, a narrow molecular weight distribution such that Mw/Mn≦
3, a composition distribution breadth index of at least 50% and a density greater than or equal to 0.900 g/cm3 ; andsaid components are selected from one of the groups consisting of;
(1) components having essentially the same average comonomer content but different average molecular weights; and
(2) components having different average molecular weights and comonomer contents; and
wherein said blend has a density greater than or equal to 0.900 g/cm3 and a Mw/Mn≦
3 wherein the blend 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 and said blend has a density greater than or equal to 0.900 g/cm3. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A polymer blend composition comprising:
a plurality of 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 0.900 g/cm3 ;
the composition having a density in the range of greater than or equal to 0.900 g/cm3 to 0.940 g/cm3 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.- View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A polymer blend composition comprising:
a plurality of 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 0.900 g/cm3 ;
said composition having a density in the range of about 0.900 g/cm3 to about 0.940 g/cm3, 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.- View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A polymer blend composition comprising:
a plurality of linear ethylene interpolymer components comprising ethylene and at least one C3 -C12 α
-olefin comonomer, each of said interpolymers having a different average molecular weight, a Mw/Mn≦
3 and a CDBI greater than 50% and a density greater than or equal to 0.900 g/cm3 ;
a high density polyethylene component;
said composition having a density greater than or equal to 0.900 g/cm3, 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.- View Dependent Claims (38, 39, 40)
Specification