An impact modifier composition (IMC) is disclosed containing a polyolefin plastomer (POP) and a hydrogenated styrenic block copolymer (HSBC) represented by a general configuration selected from: S-S/EB, S-S/EB, S-S/EB-EB, S-S/EB-EB, S-S/EB-S, S-S/EB-S, S-EP-EB, S-EP-EB, S-EB-EB, S-EB-EB, EB-S/EB-EB, EB-S/EB-EB, EB-S/EB-EB, and mixtures thereof. Prior to hydrogenation, each block S is a polymer block of a vinyl aromatic monomer, each block EB is a polybutadiene block of 1,3-butadiene monomer having a vinyl content of <35 wt. %, each block EB is a polybutadiene block of 1,3-butadiene monomer having a vinyl content of >35 wt. %, each block EP is a polyisoprene block of isoprene monomer, and each block S/EB and S/EB, independently, is a copolymer block of a vinyl aromatic monomer and 1,3-butadiene monomer. The IMC can be used in thermoplastic polyolefin (TPO) compositions to improve impact resistance for various applications, including automobile parts.

The present disclosure relates to a polyethylene composition with improved swell ratio and mechanical properties for use in preparing blow-moulded articles and having the following features: 1) a density from 0.945 to less than 0.952 g/cm.sup.3; 2) an MIF/MIP ratio from 15 to 30; 3) a Shear-Induced Crystallization Index (SIC) from 2.5 to 5.5.

The present invention relates to a branched modifier and a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g.sub.vis of 0.97 or more and an M.sub.w of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a g.sub.vis of less than 0.97, wherein the ethylene polymer has a g.sub.vis of at least 0.01 units higher than the g.sub.vis of the branched modifier.

The present invention relates to a branched modifier and a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g.sub.vis of 0.97 or more and an M.sub.w of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a g.sub.vis of less than 0.97, wherein the ethylene polymer has a g.sub.vis of at least 0.01 units higher than the g.sub.vis of the branched modifier.

The invention describes a foamable thermoplastic mixture, comprising (A) at least one thermoplastic polymer selected from ethylene-vinyl acetate copolymer (EVA), ethylene methyl acrylate copolymer (EMA), ethylene butyl acrylate copolymer (EBA), ethylene-hexene copolymer, ethylene-butene copolymer, ethylene-octene copolymer, polyethylene (PE), polypropylene (PP) and ethylene-propylene copolymer, (B) at least one long chain branched polymer as a foam stabilizer selected from ethylene-vinyl acetate copolymer (EVA), ethylene methyl acrylate copolymer (EMA), ethylene butyl acrylate copolymer (EBA), ethylene-hexene copolymer, ethylene-butene copolymer, ethylene-octene copolymer, polyethylene (PE), polypropylene (PP) and ethylene-propylene copolymer and (C) at least one chemical blowing agent, wherein the long chain branched polymer (B) is present in an amount of 1 to 30 wt. % relative to the total weight of thermoplastic polymer (A) and long chain branched polymer (B), and at least one of the following distinguishing features applies to the thermoplastic polymer (A) and the long chain branched polymer (B): 1) the value of the melt flow index (MFI) of the long chain branched polymer (B) (MFI(B)) is smaller than the MFI value of the thermoplastic polymer (A) (MFI(A)), wherein MFI(B) is a maximum of 50% of MFI(A), 2) the g value of the long chain branched polymer (B) (g(B)) is smaller than the g value of the thermoplastic polymer (A) (g(A)), wherein g(B) is a maximum of 80% of g(A), 3) the polymer type of the long chain branched polymer (B) differing from the polymer type of the thermoplastic polymer (A). The foamable thermoplastic mixture can be injection molded without foaming and is suitable for the production of low-density foams which can be used, for example, as damping materials or foamed membranes.

The present disclosure provides a polymer composition. In an embodiment, an ethylene-based polymer composition is provided and is formed by high pressure (greater than or equal to 100 MPa), free-radical polymerization, by reacting: ethylene monomer and a mixture of hydrocarbon-based molecules, with each hydrocarbon-based molecule comprising three or more terminal alkene groups.

Disclosed herein are tire tread rubber compositions comprising a specified elastomer component, reinforcing silica filler, a specified hydrocarbon resin, liquid plasticizer, and a cure package. The elastomer component includes styrene-butadiene rubber and high cis linear polybutadiene. Use of the disclosed ingredients may result in a tire tread having particular properties, as discussed further herein.

Embodiments of this disclosure are directed to ethylene-based polymers. The ethylene-based polymers are polymerized units derived from ethylene, diene, and optionally one or more C.sub.3-C.sub.12-olefins. The ethylene-based polymer includes a melt strength greater than negative 17 times the log base 10 of the melt index plus 25 ((MS)>17*log (MI)+25). In the equation, MS is the melt strength in cN and MI is the melt index in g/10 min according to ASTM D1238. The ethylene-based polymer also includes an average g that is greater than 0.70. The average g is an intrinsic viscosity ratio determined by gel permeation chromatography using a triple detector.

The present invention discloses a rubber composition, a processing method thereof, and rubber product reinforced with silica using the same. 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<A100, and an EPM and an EPDM with a total content represented as B, in which 0B<100; and the essential components comprise 1-10 parts of a crosslinking agent and 15-80 parts of silica. The rubber composition can be used for producing high-voltage insulating sheath rubber, high-temperature resistant conveyor belt, waterproof coil, rubber particles for plastic track surface layer, rubber plug, rubber roller, inner tube, tire tread, tire sidewall, and inner rubber layer of air-conditioner hose.