Thermoplastic polyolefin blends
AssigneeExxonMobil Chemical Patents Inc.
InventorsMun F. Tse, Peijun Jiang
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Abstract
This invention relates to a blend composition comprising: 1) a linear ethylene containing polymer, such as a LLDPE, a HDPE or the like; and at least 1 weight percent of an in-reactor polymer blend comprising: (a) a first ethylene containing polymer having a density of greater than 0.90 g/cm3 and a Mw of more than 20,000 g/mol; and (b) a second ethylene containing polymer having a density of less than 0.90 g/cm3, wherein the polymer blend has a Tm of at least 90° C. (DSC second melt), a density of less than 0.92 g/cm3, and the densities of the first and second polymers differ by at least 1%.
Claims41
A composition comprising:
- 1) a linear ethylene containing polymer having a density of at least 0.910 g/cm3;
- and
- 2) an in-reactor polymer blend comprising:
- (a) a first ethylene containing polymer having a density of greater than 0.90 g/cm3 and a Mw of more than 20,000 g/mol and (b) a second ethylene containing polymer having a density of less than 0.90 g/cm3, wherein the densities of the first and second polymers differ by at least 1%, and wherein the in-reactor polymer blend has a Tm of at least 90° C. (DSC second melt), a density of less than 0.92 g/cm3, and contains at least 78 wt % ethylene.
A composition comprising:
- 1) a linear ethylene containing polymer having a density of at least 0.910 g/cm3;
- and
- 2) at least 1 wt % of an in-reactor polymer blend comprising:
- (a) a first ethylene polymer comprising 90 wt % to 100 wt % ethylene and from 0 wt % to less than 10 wt % comonomer, said first ethylene polymer component having density of greater than 0.920 g/cm3 and an Mw of 20,000 g/mol or more;
- and (b) a second ethylene polymer comprising from 70 wt % to 90 wt % ethylene and 30 wt % to 10 wt % comonomer, said second ethylene polymer having a density of 0.910 g/cm3 or less, wherein the in-reactor polymer blend has:
- (a) at least 78 wt % ethylene;
- (b) a Tm of at least 100° C. over a density ranging from 0.84 to 0.92 g/cm3;
- (c) an elongation at break of 300% or more;
- (d) a strain hardening ratio, M300/M100, of at least 1.2;
- (e) a ratio of complex viscosity at 0.01 rad/s to the complex viscosity at 100 rad/s of at least 30;
- and
- (f) a shear thinning index of less than −0.2.
A process to produce a blend of a linear ethylene containing polymer and an in-reactor blend comprising:
- 1) preparing an in-reactor blend by contacting a metallocene catalyst compound and an activator with ethylene, comonomer, and a macromonomer having at least 50% vinyl terminal unsaturation based on the total unsaturated olefin chain ends, where the macromonomer has an Mw of 20,000 g/mol or more, a density of 0.920 g/cm3 or more, and optionally a melting point of 110° C. or more;
- 2) obtaining an in-reactor blend comprising:
- (a) a first ethylene polymer comprising 90 wt % to 100 wt % ethylene and from 0 wt % to less than 10 wt % comonomer, said first ethylene polymer component having density of greater than 0.920 g/cm3 and an Mw of 20,000 g/mol or more;
- and
- (b) a second ethylene polymer comprising from 70 wt % to 90 wt % ethylene and 30 wt % to 10 wt % comonomer, said second ethylene polymer having a density of 0.910 g/cm3 or less;
- wherein the in-reactor polymer blend has:
- (a) at least 78 wt % ethylene;
- (b) a Tm of at least 100° C. over a density ranging from 0.84 to 0.92 g/cm3;
- (c) an elongation at break of 300% or more;
- (d) a strain hardening ratio, M300/M100, of at least 1.2;
- (e) a ratio of complex viscosity at 0.01 rad/s to the complex viscosity at 100 rad/s of at least 30;
- and
- (f) a shear thinning index of less than −0.2;
- 3) combining at least 1 wt % of the in-reactor blend with a linear ethylene containing polymer having a density of at least 0.910 g/cm3.
Dependencies are inferred from the claim text.