A foamable or foamed article comprising a diene terpolymer, the diene terpolymer comprising (or consisting essentially of) from 0.01 wt % to 10.0 wt % diene derived units, and 1.0 wt % to 20 wt % of C.sub.4 to C.sub.10 -olefin derived units based on the weight of the diene terpolymer, wherein the diene terpolymer: a) has a g.sub.vis of less than 0.90; b) has an Mw within a range of from 100,000 g/mol to 500,000 g/mol; c) has an Mw/Mn within the range of from 3.5 to 12.0; and d) an Mz/Mn of greater than 7.0. Inventive articles comprise a blend of a relatively high density linear polyethylene and the diene terpolymer.

A bimodal polyethylene is provided. The bimodal polyethylene may include a high molecular weight portion having a weight average molecular weight (M.sub.w) of 100,000 g/mol to 1,000,000 g/mol and a low molecular weight portion having a M.sub.w of 10,000 g/mol to 80,000 g/mol. Polymer extrudates, such as cable-coatings and/or wire-coatings and films, including the bimodal polyethylene as well as methods of making the polymer extrudates are also provided.

A bimodal polyethylene is provided. The bimodal polyethylene may include a high molecular weight portion having a weight average molecular weight (M.sub.w) of 100,000 g/mol to 1,000,000 g/mol and a low molecular weight portion having a M.sub.w of 10,000 g/mol to 80,000 g/mol. Polymer extrudates, such as cable-coatings and/or wire-coatings and films, including the bimodal polyethylene as well as methods of making the polymer extrudates are also provided.

The disclosure provides an ethylene copolymer having a density of from 0.912 g/cm.sup.3 to 0.925 g/cm.sup.3, a melt flow ratio (I.sub.21/I.sub.2) of from 20 to 30, and a normal comonomer distribution profile in a GPC-FTIR analysis, wherein the normal comonomer distribution profile has a slope of from 3.5 to 7.5, where the slope is defined as the number of short chain branches per 1000 carbons at a molecular weight of 300,000 minus the number of short chain branches per 1000 carbons at a molecular weight of 30,000. The ethylene copolymers have improved bulk density and when made into film, provide good physical properties.

The disclosure provides an ethylene copolymer having a density of from 0.912 g/cm.sup.3 to 0.925 g/cm.sup.3, a melt flow ratio (I.sub.21/I.sub.2) of from 20 to 30, and a normal comonomer distribution profile in a GPC-FTIR analysis, wherein the normal comonomer distribution profile has a slope of from 3.5 to 7.5, where the slope is defined as the number of short chain branches per 1000 carbons at a molecular weight of 300,000 minus the number of short chain branches per 1000 carbons at a molecular weight of 30,000. The ethylene copolymers have improved bulk density and when made into film, provide good physical properties.

Processes are provided which include copolymerization using two different metallocene catalysts, one capable of producing high Mooney-viscosity polymers and one suitable for producing lower Mooney-viscosity polymers having at least a portion of vinyl terminations. The two catalysts may be used together in polymerization to produce copolymer compositions of particularly well-tuned properties. For instance, polymerizations are contemplated to produce high-Mooney metallocene polymers that exhibit excellent processability and elasticity, notwithstanding their high Mooney viscosity. Other polymerizations are also contemplated in which lower-Mooney metallocene polymers are produced, which also exhibit excellent processability and elasticity, while furthermore having excellent cure properties suitable in curable elastomer compound applications. Many of the contemplated polymerizations include controlling the ratio of the two metallocene catalysts used in the polymerization so as to obtain the desired Mooney viscosity and desired rheology (indicated by Mooney Relaxation Area) of the copolymer compositions.

Processes are provided which include copolymerization using two different metallocene catalysts, one capable of producing high Mooney-viscosity polymers and one suitable for producing lower Mooney-viscosity polymers having at least a portion of vinyl terminations. The two catalysts may be used together in polymerization to produce copolymer compositions of particularly well-tuned properties. For instance, polymerizations are contemplated to produce high-Mooney metallocene polymers that exhibit excellent processability and elasticity, notwithstanding their high Mooney viscosity. Other polymerizations are also contemplated in which lower-Mooney metallocene polymers are produced, which also exhibit excellent processability and elasticity, while furthermore having excellent cure properties suitable in curable elastomer compound applications. Many of the contemplated polymerizations include controlling the ratio of the two metallocene catalysts used in the polymerization so as to obtain the desired Mooney viscosity and desired rheology (indicated by Mooney Relaxation Area) of the copolymer compositions.

An ethylene/alpha-olefin copolymer composition having a density from 0.935 to 0.955 g/cc; a ratio of weight average molecular weight to number average molecular weight, Mw/Mn, of from 3 to 10; a z-average molecular weight, Mz, from 200 kg/mol to 500 kg/mol; and a PENT value of greater than 500 hours at 80 C. and 2.4 MPa; wherein when the composition is formed into a monolayer pipe the pipe has a pipe hydrostatic strength of greater than 100 hours at 20 C. and 12.0 MPa. Also provided is a pipe or pipe fitting comprising the ethylene/alpha-olefin copolymer composition.

The disclosure provides an ethylene copolymer having a density of from 0.912 g/cm.sup.3 to 0.925 g/cm.sup.3, a melt flow ratio (I.sub.21/I.sub.2) of from 20 to 30, and a normal comonomer distribution profile in a GPC-FTIR analysis, wherein the normal comonomer distribution profile has a slope of from 3.5 to 7.5, where the slope is defined as the number of short chain branches per 1000 carbons at a molecular weight of 300,000 minus the number of short chain branches per 1000 carbons at a molecular weight of 30,000. The ethylene copolymers have improved bulk density and when made into film, provide good physical properties.

The disclosure provides an ethylene copolymer having a density of from 0.912 g/cm.sup.3 to 0.925 g/cm.sup.3, a melt flow ratio (I.sub.21/I.sub.2) of from 20 to 30, and a normal comonomer distribution profile in a GPC-FTIR analysis, wherein the normal comonomer distribution profile has a slope of from 3.5 to 7.5, where the slope is defined as the number of short chain branches per 1000 carbons at a molecular weight of 300,000 minus the number of short chain branches per 1000 carbons at a molecular weight of 30,000. The ethylene copolymers have improved bulk density and when made into film, provide good physical properties.