Provided herein are metallocene-catalyzed polymer compositions that exhibit advantageous rheological properties, at least some of which are consistent with long-chain branching, as well as polymerization processes suitable for forming such polymer compositions. The polymer compositions may have both LCB index measured at 125° C. of less than 5; and phase angle δ at complex shear modulus G*=100,000 Pa of less than about 54.5°, as determined at 125° C. The polymer compositions of particular embodiments are reactor blends, preferably of ethylene copolymers (e.g., ethylene-propylene (EP) copolymers and/or ethylene-propylene-diene (EPDM) terpolymers). The reactor blend may include first and second copolymer components, which may differ in monomer content and weight-average molecular weight (Mw).

Polymer composites may be made by providing a first polymer material; treating the first polymer material; providing a second polymer material; and pressing the first polymer material and the second polymer material. The polymer composites may be incorporated into ballistic resistant materials and soft armor articles.

Polymer compositions and films are provided. The polymer compositions include (A) 10-50 wt % heterogeneously branched Ziegler-Natta-catalyzed LLDPE polymer having a composition distribution breadth index (CBDI) <50.0%; and (B) 90-50 wt % metallocene-catalyzed LLDPE polymer having melt index 0.5 g/10 min to 5.0 g/10 min; melt index ratio from 20 to 40; weight average molecular weight (Mw) of from 20,000 to 200,000 g/mol; a molecular weight distribution (Mw/Mn) from 2.0 to 4.5; density 0.910 to 0.925 g/cm.sup.3; CDBI less than 35.0%; and comonomer distribution such that a first peak and a second peak in a comonomer distribution analysis, wherein the first peak has a maximum at a log(Mw) value of 4.3 to 4.7 and a TREF elution temperature of 85.0° C. to 95.0° C. and the second peak has a maximum at a log(Mw) value of 5.1 to 5.6 and a TREF elution temperature of 60.0° C. to 70.0° C.

A polyethylene composition for producing blow-molded hollow articles, having the following features: 1) density from 0.940 to 0.955 g/cm.sup.3, determined according to ISO 1183 at 23° C.; 2) ratio MIF/MIP from 12 to 40; 3) Mz from 500,000 to 3,500,000 g/mol; 4) η.sub.0.02 from 80,000 to 300,000 Pa.Math.s; 5) HMWcopo index from 1 to 15; and 6) Mz/Mw*LCBI lower than 6.4.

The present invention discloses a rubber composition, a processing method thereof, and an aging resistant rubber product using the rubber composition. The rubber composition comprises a rubber matrix and essential components, wherein, based on 100 parts by weight of the rubber matrix, the rubber matrix comprises a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an EPM and an EPDM with a content represented as B, in which 0≤B<100 parts; and the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer. The rubber composition provided by present invention has good processability and can be used for producing rubber products with high aging resistance and compression set resistance.

The present invention discloses a rubber composition, production method thereof and a rubber product using the same. The rubber composition includes a rubber matrix and essential components. Based on 100 parts by weight of the rubber matrix, the rubber matrix includes a branched polyethylene with a content represented as A, in which 0<A≤100, and an EPM and an EPDM with a total content represented as B, in which 0≤B<100; and the essential components include 1.5 to 10 parts of a crosslinking agent and 40 to 200 parts of a reinforcing filler. The reinforcing filler includes carbon black and silica and can also include any one or more of calcium carbonate, talcum powder, calcined clay, magnesium silicate, and magnesium carbonate, wherein the content of the carbon black is 5 to 100 parts, and the content of the silica is 5 to 60 parts. The rubber composition is used for producing rubber product with better yield and tear strength and service performance. The rubber product include high-strength insulation compound for preparing wire and cable, waterproof coil, and high-temperature resistant conveyor belt.

Provided is a sheet not generating feeding failure in a device having a heat setting process even when a large amount of an inorganic filler is included and a thermoplastic resin composition for forming the sheet. The thermoplastic resin composition may include at least a thermoplastic resin and an inorganic filler, in which the thermoplastic resin includes polypropylene having no long chain branch (B) and polypropylene having a long chain branching structure (A) in a mass ratio of 80:20 to 98:2.

Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.

The present invention relates to a newpolypropylene composition with improved processability and heat resistance for use in a capacitor film, as well as a cast film and a biaxially oriented film for the use as capacitor film comprising such polypropylene composition.

Described is a wood-plastic composite material for structural components of transport pallet, said structural components being capable of being nailed together, having a matrix foamed by means of a blowing agent, wood meal fibres and an adhesion promoter. To create a wood-plastic composite material of this kind which enables a cost-efficient production of transport pallets with a wood-like appearance and constitutes a reliable replacement for the soft wood materials used up until now, at least with regard to weight and mechanical strength properties, it is proposed that the matrix, which comprises a long chain-branched polyolefin, has a mass fraction of 30-95%, the wood meal fibres have a mass fraction of 5-50% and the adhesion promoter has a mass fraction of up to 10% of the wood-plastic composite material, the composite material density being less than 0.3 g/cm.sup.3.