The present invention relates to a polyethylene copolymer which has excellent processability and long-term durability, and thus is useful for hollow molding of a pipe or the like.

The present invention relates to a polyethylene copolymer which has excellent processability and long-term durability, and thus is useful for hollow molding of a pipe or the like.

Catalyst systems and methods for making and using the same. A method of methylating a catalyst composition while substantially normalizing the entiomeric distribution is provided. The method includes slurrying the organometallic compound in dimethoxyethane (DME), and adding a solution of RMgBr in DME, wherein R is a methyl group or a benzyl group, and wherein the RMgBr is greater than about 2.3 equivalents relative to the organometallic compound. After the addition of the RMgBr, the slurry is mixed for at least about four hours. An alkylated organometallic is isolated, wherein the methylated species has a meso/rac ratio that is between about 0.9 and about 1.2.

The invention relates to a polyethylene (PE) composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, wherein fraction (A) has melt flow rate, MFR2, from 100 to 600 g/10 min; and (B) a second ethylene-1-hexene copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B) and wherein fraction (B) is present in an amount of from 50.0 to 58.0 wt.% based on the total weight of the base resin; wherein the base resin has a content of units derived from 1-hexene from 0.44 to 0.79 mol% based on the total amount of base resin; wherein the base resin has a molecular weight distribution, being the ratio of Mw/Mn, from 32 to 40 and the base resin has a Z average molecular weight, Mz, of more than 1,500 kg/mol; wherein the polyethylene composition has a melt flow rate MFR5 from 0.10 to 0.25 g/10 min; and a melt flow rate ratio, FRR21/5, from 30 to 42; and wherein the polyethylene composition has a critical temperature, Tc, in the rapid crack propagation test of -10° C. or lower and not less than -25° C. The invention also relates to a PE composition obtainable by a multistage process, an article comprising a PE composition, a pipe and use of a PE composition comprising a base resin for producing an article.

The invention relates to a polyethylene (PE) composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, wherein fraction (A) has melt flow rate, MFR2, from 100 to 600 g/10 min; and (B) a second ethylene-1-hexene copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B) and wherein fraction (B) is present in an amount of from 50.0 to 58.0 wt.% based on the total weight of the base resin; wherein the base resin has a content of units derived from 1-hexene from 0.44 to 0.79 mol% based on the total amount of base resin; wherein the base resin has a molecular weight distribution, being the ratio of Mw/Mn, from 32 to 40 and the base resin has a Z average molecular weight, Mz, of more than 1,500 kg/mol; wherein the polyethylene composition has a melt flow rate MFR5 from 0.10 to 0.25 g/10 min; and a melt flow rate ratio, FRR21/5, from 30 to 42; and wherein the polyethylene composition has a critical temperature, Tc, in the rapid crack propagation test of -10° C. or lower and not less than -25° C. The invention also relates to a PE composition obtainable by a multistage process, an article comprising a PE composition, a pipe and use of a PE composition comprising a base resin for producing an article.

Provided in this disclosure is an ethylene interpolymer composition. The ethylene interpolymer composition includes a first ethylene interpolymer, a second ethylene interpolymer, and a third ethylene interpolymer. Further, the ethylene interpolymer composition has a density of at least 0.945 g/cm3; an environmental stress crack resistance (ESCR), measured according to ASTM D1693, Condition B, 10% IGEPAL CO-360, of at least 90 hours; and an Izod impact strength of at least 80 J/m, as measured according to ASTM D256.

Provided in this disclosure is an ethylene interpolymer composition. The ethylene interpolymer composition includes a first ethylene interpolymer, a second ethylene interpolymer, and a third ethylene interpolymer. Further, the ethylene interpolymer composition has a density of at least 0.945 g/cm3; an environmental stress crack resistance (ESCR), measured according to ASTM D1693, Condition B, 10% IGEPAL CO-360, of at least 90 hours; and an Izod impact strength of at least 80 J/m, as measured according to ASTM D256.

A high-density polyethylene composition that is formulated for being injection molded into an injection-molded bottle cap closure comprising a skirt that axially extends from the periphery of a base, and internal screw threads for securing the cap to a container, and method of producing the same.

A high-density polyethylene composition that is formulated for being injection molded into an injection-molded bottle cap closure comprising a skirt that axially extends from the periphery of a base, and internal screw threads for securing the cap to a container, and method of producing the same.

A dual reactor solution process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer and which have good processability, toughness, and environmental stress crack resistance. The polyethylene compositions are suitable for the preparation of rotomolded parts.