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.

Provided are: an olefin-based resin composition that can yield a molded article having excellent transparency in which coloration is inhibited; a method for producing the olefin-based resin composition; and a molded article of the olefin-based resin composition. The olefin-based resin composition contains, with respect to 100 parts by mass of an olefin polymer: 0.001 to 10 parts by mass of one or more compounds (A) represented by Formula (1) wherein R.sup.1 to R.sup.4 each independently represent a hydrogen atom or an alkyl group having 1 to 9 carbon atoms; R.sup.5 represents a hydrogen atom or methyl; m represents 1 or 2; and M.sup.1 represents, for example, a hydrogen atom; and 0.001 to 10 parts by mass of a fatty acid metal salt (B) represented by Formula (2) wherein R.sup.6 represents a group having 10 to 30 carbon atoms and introduced from an aliphatic organic acid; n represents 1 or 2; and M.sup.2 represents an alkali metal atom or a multivalent metal inorganic group. In the olefin-based resin composition, an aluminum content in the olefin polymer is 0.01 mol or less per 1 kg of the olefin polymer. ##STR00001##

A polyethylene composition includes a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M.sub.w/M.sub.n of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 15,000 to 100,000, a molecular weight distribution M.sub.w/M.sub.n of >2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M.sub.w/M.sub.n of >2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 10 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of 200 ≥MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of ≤90° C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of ≥160 Newtons.Math.C° (at a film thickness of about 2 mil) and an oxygen transmission rate (OTR) of ≥600 cm.sup.3 per 100 inch per day (at a film thickness of about 1 mil).

A polyolefin composition made from or containing: (A) 18-35% by weight of a copolymer of propylene with an alpha-olefin, wherein the copolymer contains 2.0-4.0% by weight of the alpha-olefin and has a melt flow rate (MFR.sub.A) ranging from 30 to 60 g/10 min; and (B) 65-82% by weight of a copolymer of propylene with an alpha-olefin, and optionally a diene, wherein the copolymer is made from or containing 20-35% by weight of the alpha-olefin, wherein the polyolefin composition is made from or containing a fraction that is soluble in xylene at 25° C. (XS(tot)) in an amount higher than 70% by weight; the amounts of (A), (B), and the fraction soluble in xylene at 25° C. (XS(tot)) are based on the total weight of the polyolefin composition; and the melt flow rate (MFR) of the polyolefin composition ranges from 0.2 to 2.0 g/10 min.

Disclosed is a polypropylene with an MFR of at least 20 g/10 min comprising a homopolypropylene and optionally within a range from 2 wt % to 30 wt % of an propylene-α-olefin copolymer by weight of the polypropylene; wherein the homopolypropylene has a MFR within a range from 30 g/10 min to 200 g/10 min, an Mw/Mn within a range from 7 to 16, and comprising 1.1 wt % or less atactic polypropylene based on the total weight of the homopolypropylene and atactic polypropylene, where the propylene-α-olefin copolymer has within a range from 30 wt % to 50 wt % α-olefin derived units by weight of the propylene-α-olefin copolymer, and an intrinsic viscosity within a range from 4 to 8 dL/g. The impact copolymer may be obtained by combining a Ziegler-Natta catalyst having at least two different internal electron donors with propylene in reactors in series to produce the homopolypropylene followed by a gas phase reactor to produce a propylene-α-olefin copolymer.

The invention relates to a process for producing a polypropylene composition by sequential polymerization the polypropylene composition having an improved balanced combination of high flowability, high stiffness and impact, and high level of optical properties.

A propylene resin composition includes a propylene polymer (A) satisfying requirements (1) to (3) below: (1) having a number average molecular weight (Mn) measured by gel permeation chromatography (GPC) of 5000 to 22000; (2) having a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) measured by gel permeation chromatography (GPC) being 1.2 to 3.5; and (3) having a proportion of a component eluted at a temperature of not more than −20° C. in temperature rising elution fractionation (TREF) being not more than 3.5 mass %.

The present invention relates to a polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene-hexene-1 copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B) and wherein fraction (B) is present in an amount of from 51.0 to 58.5 wt. %, preferably 52.0 to 57.5 wt. %, more preferably 53.0 to 57.0 wt. % based on the total weight of the base resin, wherein fraction (B) of the base resin has a content of units derived from hexene-1 from 0.80 to 1.45 mol %, preferably of from 0.82 to 1.35 mol % and more preferably of from 0.85 to 1.30 mol %, wherein the base resin has a number average molecular weight Mn of 8,500 g/mol or higher, and wherein the polyethylene composition has a melt flow rate MFRs from 0.10 to 0.30 g/10 min, preferably from 0.15 to 0.28, and still more preferably from 0.16 to 0.25 g/10 min, to a process for producing the polyethylene composition, to an article, especially a pipe comprising the polyethylene composition and to the use of the polyethylene composition for the production of an article, especially a pipe.

Disclosed herein is a film comprising a layer that comprises a polyethylene composition comprising the reaction product of ethylene and optionally one or more alpha-olefin comonomers, wherein said polyethylene composition is characterized by the following properties: a melt index, I.sub.2, measured according to ASTM D1238 (2.16 kg, 190 C), of from 0.5 to 10 g/10 min; a density (measured according to ASTM D792) of less than 0.935 g/cm.sup.3; a melt flow ratio, I.sub.10/I.sub.2, wherein I.sub.10 is measured according to ASTM D1238 (10 kg, 190 C) of from 6.0 to 7.5; a molecular weight distribution (Mw/Mn) of from 2.8 to 3.9; and a vinyl unsaturation of greater than 0.12 vinyls per one thousand carbon atoms, and a low density polyethylene.

Propylene and butene random copolymers are disclosed that have excellent stiffness properties and excellent transparency characteristics especially when combined with one or more nucleating agents. The propylene-butene copolymers can be made with different melt flow characteristics making them well suited for use in injection molding, blow molding and thermoforming applications.