Very low density polyethylene blends
AssigneeUnivation Technologies, LLC
InventorsPaul Masten German, James McLeod Farley, Richard W. Halle, George Panagopoulos
Life of this patent
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Abstract
Blends of very low density polyethylene produced using metallocene catalysts (mVLDPE) and linear low density polyethylene (LLDPE) are disclosed. The polymer blends include a metallocene-catalyzed VLDPE polymer having a density of less than 0.916 g/cm3, the VLDPE polymer preferably being linear and without long chain branching, and a LLDPE polymer having a density of from 0.916 to 0.940 g/cm3. The polymer blends are particularly suitable in blown and cast film applications.
Claims25
A polymer blend composition, comprising:
- (i) a copolymer derived from ethylene and one or more C3–C20 alpha olefin comonomers, said copolymer having:
- a) a comonomer content of from 5 to 15 wt. %,
- b) a density of less than 0.916 g/cm3,
- c) a composition distribution breadth index in the range of from 55% to 70%,
- d) a molecular weight distribution Mw/Mn of from 2 to 3,
- e) a molecular weight distribution Mz/Mw of less than 2, and
- f) a bi-modal composition distribution;
- and
- (ii) a linear low density polyethylene polymer having a density of from 0.916 to 0.940 g/cm3.
A monolayer film comprising a polymer blend composition, the polymer blend composition comprising:
- (i) a copolymer derived from ethylene and one or more C3–C20 alpha olefin comonomers, said copolymer having:
- a) a comonomer content of from 5 to 15 wt. %,
- b) a density of less than 0.916 g/cm3,
- c) a composition distribution breadth index in the range of from 55% to 70%,
- d) a molecular weight distribution Mw/Mn of from 2 to 3,
- e) a molecular weight distribution Mz/Mw of less than 2, and
- f) a bi-modal composition distribution;
- and
- (ii) a linear low density polyethylene polymer having a density of from 0.916 to 0.940 g/cm3.
A polymer blend composition, comprising:
- (i) a copolymer derived from ethylene and one or more C3–C20 alpha olefin comonomers, said copolymer having:
- a) a comonomer content of from 5 to 15 wt. %,
- b) a density of less than 0.916 g/cm3,
- c) a composition distribution breadth index in the range of from 55% to 70%,
- d) a molecular weight distribution Mw/Mn of from 2 to 3, and
- e) a molecular weight distribution Mz/Mw of less than 2;
- and
- (ii) a linear low density polyethylene polymer having a density of from 0.916 to 0.940 g/cm3.
A polymer blend composition, comprising:
- (a) a metallocene-catalyzed linear very low density polyethylene polymer having:
- (i) a density of less than 0.916 g/cm3,
- (ii) a composition distribution breadth index of 50 to 85% by weight,
- (iii) a molecular weight distribution Mw/Mn of 2 to 3,
- (iv) a molecular weight distribution Mz/Mw of less than 2, and
- (v) two peaks in a TREF measurement, and
- (b) a linear low density polyethylene polymer having a density of from 0.916 to 0.940 g/cm3.
A monolayer film formed from a polymer composition blend, the polymer blend composition comprising:
- (a) a metallocene-catalyzed linear very low density polyethylene polymer having:
- (i) a density of less than 0.916 g/cm3,
- (ii) a composition distribution breadth index of 50 to 85% by weight,
- (iii) a molecular weight distribution Mw/Mn of 2 to 3,
- (iv) a molecular weight distribution Mz/Mw of less than 2, and
- (v) two peaks in a TREF measurement, and
- (b) a linear low density polyethylene polymer having a density of from 0.916 to 0.940 g/cm3.
A polymer blend composition, comprising:
- (a) a metallocene-catalyzed linear very low density polypropylene polymer having:
- (i) a density of less than 0.916 g/cm3,
- (ii) a composition distribution breadth index of 50 to 85% by weight,
- (iii) a molecular weight distribution Mw/Mn of 2 to 3, and
- (iv) a molecular weight distribution Mz/Mw of less than 2, and
- (b) a linear low density polyethylene polymer having a density of from 0.916 to 0.940 g/cm3.
Dependencies are inferred from the claim text.