Abstract: The present disclosure relates to catalysts comprising two heterogeneous chromium catalysts for the polymerization of olefins are provided herein. The catalysts, as well as related compositions and methods using the same, may be used to for the production of polyolefins, including for the production of bimodal molecular weight distribution polyolefins, e.g., polyethylene and copolymers of ethylene and 1-hexene.

Abstract: A molded article made from and/or containing a polymeric composition made from and/or containing a high melt flow rate polypropylene homopolymer composition, a compatibilizer, a polyethylene-based elastomer, and talc is provided. An automobile part, including bumper facias, body side-molding, instrumental panels, side pillars, and door trims, with improved coefficients of linear thermal expansion is also provided.

Abstract: A tie layer adhesive composition for multilayer structures, wherein the tie layer is composed of a graft polyolefin and a hybrid polyolefin.

Abstract: Adhesive compositions for styrene polymers are provided. The adhesives are suitable for use as tie-layers in multi-layer films and sheets and comprise a polyolefin base resin, a functionalized polyolefin and a combination of styrene triblock copolymers.

Abstract: A low-smoke, non-halogenated flame retardant composition made from and/or containing polypropylene, magnesium dihydroxide, and aluminum magnesium layered double hydroxide modified with a hydrogenated fatty acid is disclosed. A composition containing and/or made from (a) a polypropylene, (b) a first distribution of magnesium dihydroxide particles having a d50 in the range of about 0.75 microns to about 1.25 microns, (c) a second distribution of magnesium dihydroxide particles having a d50 in the range of about 1.50 microns to about 3.50 microns, and (d) aluminum magnesium layered double hydroxide modified with a hydrogenated fatty acid is disclosed. A power cable having a jacket made from and/or containing a low-smoke non-halogenated flame retardant composition is also disclosed.

Abstract: A molded article made from and/or containing a polymeric composition made from and/or containing a high melt flow rate polypropylene homopolymer composition, a compatibilizer, a polyethylene-based elastomer, and talc is provided. An automobile part, including bumper facias, body side-molding, instrumental panels, side pillars, and door trims, with improved coefficients of linear thermal expansion is also provided.

Abstract: The present invention relates to novel methods for producing a bimodal or broad distribution of molecular weight polyolefin polymers using Cr/silica catalysts. In some aspects the methods utilize different pressures of hydrogen to tailor the properties of the polymer. In particular aspects, a method of preparing a polyolefin having a bimodal molecular weight distribution, comprising: (a) preparing a reaction mixture comprising a monomer, a catalyst, and an organic solvent; (b) heating the reaction mixture under a first set of reaction conditions to effect a first polymerization comprising the polymerization of a first fraction of the monomer; and (c) heating the reaction mixture under a second set of reaction conditions to effect a second polymerization comprising the polymerization of a second fraction of the monomer.

Abstract: Adhesive compositions for styrene polymers are provided. The adhesives are suitable for use as tie-layers in multi-layer films and sheets and comprise a polyolefin base resin, a functionalized polyolefin and a combination of styrene triblock copolymers.

Abstract: A tie layer adhesive composition for multilayer structures, wherein the tie layer is composed of a graft polyolefin and a hybrid polyolefin.

Abstract: Processes for forming propylene are described herein.

Abstract: A molded article made from and/or containing a polymeric composition made from and/or containing a high melt flow rate polypropylene homopolymer composition, a compatibilizer, a polyethylene-based elastomer, and talc is provided. An automobile part, including bumper facias, body side-molding, instrumental panels, side pillars, and door trims, with improved coefficients of linear thermal expansion is also provided.

Abstract: The present disclosure provides a thermoplastic olefinic composition made from or containing: (A) a first polymer composition made from or containing a homopolymer polypropylene; (B) a second polymer composition made from or containing a polypropylene polymer grafted with an unsaturated monomer; (C) a third polymer composition made from or containing a first elastomeric ethylene copolymer; and (D) a carbon fiber composition made from or containing a carbon fiber coupled with a sizing composition. Optionally, the thermoplastic olefinic composition may be further made from or contain (a) a fourth polymer composition made from or containing a heterophasic polypropylene copolymer, (b) a fifth polymer composition made from or containing a second elastomeric ethylene composition, (c) an inorganic filler composition, (d) an additives composition, or (e) any combination of these components. The thermoplastic olefinic composition is suitable for use as a metal-replacement component, including automotive components.

Abstract: Multimodal polyethylene resins having improved stress crack resistance and melt strength rendering them useful for the manufacture of thick-walled pipe are produced in a process wherein the second stage of the process is a copolymerization conducted at a high temperature with a low comonomer to ethylene ratio and a low hydrogen to ethylene ratio.

Abstract: Disclosed is a polyethylene composition having faster crystallization rate and improved environmental stress cracking resistance. The polyethylene composition comprises a multimodal polyethylene and a nucleating agent. The multimodal polyethylene comprises from 25 to 50 wt % of a low molecular weight ethylene homopolymer component, from 25 to 50 wt % of a medium molecular weight ethylene copolymer component and from 25 to 50 wt % of a high molecular weight ethylene copolymer component. The polyethylene composition has an environmental stress cracking resistance (ASTM D1693, Condition B in 100% Igepal) greater than or equal to 40 days and a crystallization half time less than or equal to 70% of the crystallization half time of the multimodal polyethylene without nucleating agent.

Abstract: A process of extruding a blend of an irradiated first propylene polymer and a non-irradiated second propylene polymer, where the first propylene polymer comprises a non-phenolic stabilizer. The irradiation of the first propylene polymer extrudate is conducted in a reduced oxygen environment, and the irradiated first propylene polymer and the non-irradiated second propylene polymer are blended at a temperature below their respective melting points. The blend has a viscosity retention of 20 to 35%.

Abstract: The present disclosure provides a polyolefin-based composition suitable for use as adhesives and/or tie-layer adhesive compositions as well as multi-layered structures made from and/or containing the polyolefin-based composition. The polyolefin-based composition is made from and/or contains (a) a grafted polyolefin composition, (b) a linear low density polyethylene composition made from and/or containing metallocene-catalyzed linear low density polyethylene having a melt index from about 2 to about 10 grams per 10 minutes, (c) an elastomer composition made from and/or containing an polyethylene elastomer, (d) a hydrocarbon-based tackifier, and (e) optionally, an additives composition having one or more additives.

Abstract: The present invention relates to novel methods for producing a bimodal or broad distribution of molecular weight polyolefin polymers using Cr/silica catalysts. In some aspects the methods utilize different pressures of hydrogen to tailor the properties of the polymer. In particular aspects, a method of preparing a polyolefin having a bimodal molecular weight distribution, comprising: (a) preparing a reaction mixture comprising a monomer, a catalyst, and an organic solvent; (b) heating the reaction mixture under a first set of reaction conditions to effect a first polymerization comprising the polymerization of a first fraction of the monomer; and (c) heating the reaction mixture under a second set of reaction conditions to effect a second polymerization comprising the polymerization of a second fraction of the monomer.

Abstract: A film comprising a polymer blend of: (a) 0.15 to 0.8 wt % of an LDPE having an MI of 0.1 to 0.6 dg/min; and (b) 99.2 to 99.85 wt % of an LLDPE produced with a single-site catalyst comprising a metallocene and having a haze (HZlldpe), dart impact (DIlldpe), MD-Tear (MDTlldpe), and a slice long chain branching index of at least 0.90 for any portion of the composition having a molecular weight of 100,000 or above, wherein the film has a haze (HZblend), a dart impact (DIblend), and an MD-Tear (MDTblend), and HZblend=a*HZlldpe, where a is 0.20 to 0.70; DIblend=b*DIlldpe, where b is 0.9 to 1.3; and MDTblend=c*MDTlldpe, where c is 0.8 to 1.1.

Abstract: The present disclosure provides a polyolefin-based composition, suitable for use as a tie-layer adhesive composition, and a process for making the polyolefin-based composition. The polyolefin-based composition is made from and/or contains a grafted polyolefin copolymer composition, a base resin composition, and optionally, an additives composition. The grafted polyolefin copolymer composition is made from and/or contains a grafted polyolefin composition, an olefin elastomer composition, and a long-chain branched polyolefin composition. The grafted polyolefin is coupled to the olefin elastomer and the long-chain branched polyolefin.

Abstract: A molded article made from and/or containing a polymeric composition made from and/or containing a high melt flow rate polypropylene homopolymer composition, a compatibilizer, a polyethylene-based elastomer, and talc is provided. An automobile part, including bumper facias, body side-molding, instrumental panels, side pillars, and door trims, with improved coefficients of linear thermal expansion is also provided.