The present disclosure provides formulation. The formulation contains a high density polyethylene composition containing (i) a high molecular weight component including an ethylene/a-olefin copolymer, the high molecular weight component having a density from 0.924 to 0.930 g/cc and a high load melt index (121) from 0.3 to 0.9 g/10 min; and (ii) a low molecular weight component including an ethylene-based polymer selected from the group consisting of an ethylene homopolymer and an ethylene/a-olefin copolymer. The high density polyethylene composition has (a) a density from 0.950 to 0.956 g/cc; (b) a high load melt index (121) from 15 to 28 g/10 min; (c) an 121/12 of at least 85; (d) a notched constant tensile load failure time at 35% yield stress of greater than 90 hours; and (e) an environmental stress crack resistance (ESCR) F0 value, according to ASTM D1693-condition B (100% IGEPAL), of greater than 2,000 hours.

In an embodiment, a pipe includes a polyethylene composition that includes ethylene and an alpha-olefin comonomer, wherein the polyethylene composition has a melt index of from 0.1 g/10 min to 1 g/10 min, a density of from 0.93 g/cm.sup.3 to 0.94 g/cm.sup.3, and a melt index ratio of from 40 to 70, and wherein the pipe has a 20 C. long term hydrostatic strength of from 5 MPa to 10.1 MPa. In another embodiment, a method of making a pipe includes extruding any polyethylene composition described herein. In another embodiment, an article includes a polyethylene composition described herein. In another embodiment, a polyethylene composition having a melt index of from 0.1 g/10 min to 1 g/10 min, a density of from 0.93 g/cm.sup.3 to 0.94 g/cm.sup.3, and a melt index ratio of from 40 to 70 is provided.

In an embodiment, a pipe includes a polyethylene composition that includes ethylene and an alpha-olefin comonomer, wherein the polyethylene composition has a melt index of from 0.1 g/10 min to 1 g/10 min, a density of from 0.93 g/cm.sup.3 to 0.94 g/cm.sup.3, and a melt index ratio of from 40 to 70, and wherein the pipe has a 20 C. long term hydrostatic strength of from 5 MPa to 10.1 MPa. In another embodiment, a method of making a pipe includes extruding any polyethylene composition described herein. In another embodiment, an article includes a polyethylene composition described herein. In another embodiment, a polyethylene composition having a melt index of from 0.1 g/10 min to 1 g/10 min, a density of from 0.93 g/cm.sup.3 to 0.94 g/cm.sup.3, and a melt index ratio of from 40 to 70 is provided.

The present disclosure relates to an assessment method for a polyethylene resin, and more specifically to a new assessment method for a polyethylene resin which can accurately determine long-term durability of a molded article by using physical properties that are easily measurable in a short time.

The present disclosure relates to an assessment method for a polyethylene resin, and more specifically to a new assessment method for a polyethylene resin which can accurately determine long-term durability of a molded article by using physical properties that are easily measurable in a short time.

This disclosure relates to ethylene interpolymer compositions. Specifically, ethylene interpolymer products having: a Dilution Index (Y.sub.d) greater than 0; total catalytic metal 3.0 ppm; 0.03 terminal vinyl unsaturations per 100 carbon atoms, and; optionally a Dimensionless Modulus (X.sub.d) greater than 0. The disclosed ethylene interpolymer products have a melt index from about 0.3 to about 500 dg/minute, a density from about 0.869 to about 0.975 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 25 and a CDBI.sub.50 from about 20% to about 97%. Further, the ethylene interpolymer products are a blend of at least two ethylene interpolymers; where one ethylene interpolymer is produced with a single-site catalyst formulation and at least one ethylene interpolymer is produced with a heterogeneous catalyst formulation.

This disclosure relates to ethylene interpolymer compositions. Specifically, ethylene interpolymer products having: a Dilution Index (Y.sub.d) greater than 0; total catalytic metal 3.0 ppm; 0.03 terminal vinyl unsaturations per 100 carbon atoms, and; optionally a Dimensionless Modulus (X.sub.d) greater than 0. The disclosed ethylene interpolymer products have a melt index from about 0.3 to about 500 dg/minute, a density from about 0.869 to about 0.975 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 25 and a CDBI.sub.50 from about 20% to about 97%. Further, the ethylene interpolymer products are a blend of at least two ethylene interpolymers; where one ethylene interpolymer is produced with a single-site catalyst formulation and at least one ethylene interpolymer is produced with a heterogeneous catalyst formulation.

A dual reactor solution polymerization process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer. The polyethylene compositions can be used in the manufacture of injection molded closures or cast film having good barrier properties.

A dual reactor solution polymerization process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer. The polyethylene compositions can be used in the manufacture of injection molded closures or cast film having good barrier properties.

A method for evaluating long-term durability of a resin for piping is provided. Unlike the conventional FNCT evaluation method requiring a long period of time, the method disclosed herein is capable of predicting long-term durability of a resin for piping in a short time, by a simple calculation using a content of tie molecules, an entanglement molecular weight (M.sub.e) and a content of ultrahigh molecular weight components. In addition, the olefinic polymer is configured to have a predetermined relationship in relation to the content of tie molecules, the entanglement molecular weight (M.sub.e) and the content of ultrahigh molecular weight components, whereby the polymer of the present application can be used in the manufacture of a heating pipe requiring excellent long-term durability.