Abstract: A copolymer of ethylene and of myrcene, in which the ethylene units represent between 50 mol % and 95 mol % of the ethylene units and of the myrcene units, and the myrcene units of 1,2 and 3,4 configuration represent more than 50 mol % of the myrcene units, is provided. Such a copolymer exhibits an improved compromise between the degree of crystallinity and the stiffness. It therefore makes it possible to widen the field of application of ethylene-rich diene copolymers in rubber compositions, and also to increase the production capacity of a unit for the synthesis of ethylene-rich diene polymers.

Abstract: A polypropylene composition made from or containing (i) component (1) made from or containing a propylene homopolymer or copolymer containing 0 to 0.5% by weight of an ethylene-derived unit; (ii) component (2) made from or containing an ethylene/propylene copolymer containing 15 to 30% by weight of an ethylene-derived unit; and (iii) 0.01 to 1.0 parts by weight of a crystal nucleating agent based on a total of 100 parts by weight of component (1) and component (2); wherein 1) the Mw/Mn value of xylene insolubles (XI) is in the range of 6 to 20, 2) the weight ratio of component (1) to component (2) is in the range of 82:18 to 90:10, 3) the intrinsic viscosity of xylene solubles (XSIV) is in the range of 2.5 to 3.4 dl/g, 4) the MFR (at 230° C. under a load of 2.16 kg) is in the range of 3 to 10 g/10 min.

Abstract: The present invention relates to a method of preparing a conjugated diene-based polymer by continuous polymerization using two or more reactors, and relates to a method of preparing a conjugated diene-based polymer which is capable of providing a conjugated diene-based polymer having improved Mooney viscosity and excellent cis 1,4 bond content and linearity, by controlling the injection amount of a conjugated diene-based monomer to each reactor in a specific ratio and resolving the deterioration phenomenon of physical properties, which might be generated in continuous reaction.

Abstract: The present invention relates to a hydrocarbon resin production method comprising thermal polymerization under non-catalytic conditions, thereby enabling a narrow molecular weight distribution and the realization of uniform physical properties. Specifically, the present invention relates to a hydrocarbon resin production method and a hydrocarbon resin produced thereby, the method comprising thermal polymerization without a catalyst and an initiator, thereby enabling, by a low polydispersity index, a narrow molecular weight distribution, and thus a hydrocarbon resin having uniform physical properties.

Abstract: In an embodiment, a thermoplastic vulcanizate (TPV) composition is provided. The TPV composition includes a thermoplastic polyolefin; and an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has: a Mw of from 500,000 g/mol to 3,000,000 g/mol, a Mw/Mn of 4.0 or lower, and a g?vis of 0.90 or greater. In another embodiment, a TPV composition includes a thermoplastic phase and an ethylene-propylene-diene terpolymer, wherein the thermoplastic vulcanizate composition has: a hardness of from 20 Shore A to 60 Shore D; and a stress relaxation slope of ?1 to ?5 (1/min) as measured by an Elastocon stress relaxation instrument.

Abstract: The invention relates to a polypropylene composition comprising a propylene homopolymer or propylene-ethylene copolymer having an ethylene content of at most (1.0) wt % based on the propylene-ethylene copolymer, wherein the amount of propylene homopolymer or propylene-ethylene copolymer is at least (98) wt %, for example at least (98.5) wt %, preferably at least (99) wt %, more preferably at least (99.5), for example at least (99.75) wt % based on the polypropylene composition, wherein the polypropylene composition has a melt flow rate in the range of (0.10) to less than (0.70) dg/min as measured according to ISO1133 (2.16 kg/230° C.), an Mw/Mn in the range from (7.0) to (13.0), wherein Mw stands for the weight average molecular weight and Mn stands for the number average weight, an Mz/Mn is in the range from (20) to (50), wherein Mz stands for the z-average molecular weight and wherein Mw, Mn and Mz are measured according to ASTM (D6474-12).

Abstract: Provided are a rubber composition for tires having excellent low fuel consumption and having crack resistance and tear resistance, which contains a rubber component (A) containing a synthetic isoprene having a weight-average molecular weight (Mw) of 800,000 or more, a molecular weight distribution (Mw/Mn) of 2.5 or less, and a cis-1,4-bond content of 96% or more, a carbon black (B), and a specific carbon black dispersant (C); and a tire using the rubber composition.

Abstract: Polypropylene polymer compositions are disclosed that can be formulated to have excellent transparency properties in conjunction with excellent impact resistance properties. The polypropylene polymer compositions are heterophasic compositions containing a first phase polymer combined with a second phase polymer. The first phase polymer is a polypropylene and alpha-olefin copolymer while the second phase polymer is also a polypropylene and alpha-olefin random copolymer. The first phase polymer contains ethylene in an amount less than 5% by weight and is present in an amount greater than the second phase polymer. The second phase polymer has elastomeric properties.

Abstract: Articles made from a moisture-crosslinkable, polymeric composition comprising in weight percent based on the weight of the composition: (A) 10 to 99.99 wt % of a nonpolar ethylenic polymer grafted with silane functionality (Si-g-npPE), the npPE having the following properties before grafting: (1) a vinyl content of 0.2 to 0.7 per 1,000 carbon atoms, (2) a melt index of 1.5 to 7.0 dg/min, (3) a density of 0.913 to 0.965 g/cc, and (4) a molecular weight distribution (Mw/Mn) of equal to or less than 8; (B) 0.01 to 20 wt % of a silanol condensation catalyst; and (C) 0 to 70 wt % of a flame retardant additive; exhibit one or more of desirable (a) silane grafting efficiency; (b) hot creep performance as a cable jacket/insulation after moisture crosslinking; (c) retained dielectric strength after glancing impact as a moisture crosslinked cable construction; and (d) crush resistance as a moisture crosslinked cable construction.

Abstract: A propylene butylene polymer composition comprising A) a propylene butylene copolymer or a propylene butylene ethylene terpolymer which is—free of phthalic acid esters as well as decomposition products thereof; —obtained by a Ziegler-Natta catalyst and B) a mixture of at least one particulate and at least one soluble nucleating agent, whereby the propylene butylene polymer composition has—a MFR (2.16 kg/210° C.) in the range of 12 to 50 g/10 min—a tensile modulus (measured on injection moulded test specimens in accordance with ISO 527) of more than 1200 MPa—a Tm of more than 150° C.—an amount of xylene cold soluble (XCS) fraction of less than 7.0 wt.-% and whereby the propylene butylene copolymer includes monomer units derived from a) propylene in an amount of 91-96 wt.-% b) butylene in an amount of 4-9 wt.-% with respect to the total weight of the propylene butylene copolymer. or wherein the propylene butylene ethylene terpolymer includes monomer units derived from a) propylene in an amount of 90-96 wt.

Abstract: The present invention relates to a polyester resin composition capable of having an excellent shrinkage rate, being heat-shrunk at a low temperature, and improving adhesion properties, without impairing insulation properties in a state of heat-shrinkable films, and a method for preparing the same. The present polyester resin composition comprises: a copolymerized polyester resin including a dicarboxylic acid-derived residue including a residue derived from an aromatic dicarboxylic acid; and a diol-derived residue including a residue derived from 4-(hydroxymethyl)cyclohexyl methyl 4?-(hydroxymethyl)cyclohexane carboxylate, and a residue derived from 4,4-(oxybis(methylene)bis) cyclohexane methanol, an alkali metal compound, and an alkaline earth metal compound, wherein the alkali metal compound and the alkaline earth metal compound are contained in an amount that the content ratio of the alkali metal element/the alkaline earth metal element derived therefrom is 0.01 to 1.

Abstract: Provided are a method of preparing a graft copolymer, a graft copolymer, and a thermoplastic resin molded article. The method of preparing a graft copolymer includes 1) adding a conjugated diene-based monomer and performing polymerization to prepare a conjugated diene-based polymer; and 2) adding the conjugated diene-based polymer, an aromatic vinyl monomer, and a vinyl cyan monomer and performing polymerization to prepare a graft copolymer, wherein an emulsifier having an APHA color value of 50 or less and a critical micelle concentration of 1 to 50 g/l is added, so that excellent polymerization stability, colorability, light resistance, and surface clarity are exhibited.

Abstract: Disclosed are methods for forming boron nitride-containing aggregates that exhibit improved wear by attrition, and resulting filled polymers that exhibit significantly improved thermal conductivity. The boron nitride-containing aggregates are prepared according to a method that includes wet granulating boron nitride powder with a granulation solution to form wet boron nitride-containing granules; and drying the wet boron nitride-containing granules to cause evaporation of solvent in the granulation solution, thereby forming boron nitride-containing granules. Sintering achieves the desired boron nitride-containing aggregates.

Abstract: Low molecular weight, highly branched polyolefins are provided. Also provided are catalyst-mediated methods of making the low molecular weight, highly branched polyolefins and a catalyst system for carrying out the methods. The catalyst system is a homogeneous catalytic system that includes a single-site organozirconium complex and hydrocarbon-soluble perfluoroarylborate co-catalyst that is highly active for the oligomerization of olefin monomers in non-polar media.

Abstract: The present application provides switchable, homogeneous paint composition and methods of painting and/or forming films or coatings using the composition. The composition includes a liquid having an aqueous solution and dissolved acid gas (e.g., carbonated water), and a switchable polymer. The switchable polymer converts from a protonated, water-soluble form in the liquid to a water-insoluble unprotonated form following removal or substantial removal of the liquid and acid gas.

Abstract: A polyethylene composition for producing blow-molded hollow articles, having the following features: 1) a density from 0.945 to 0.958 g/cm3, determined according to ISO 1183 at 23° C.; 2) a ratio MIF/MI10 from 2 to 10; 3) a ?0.02 from 200,000 to 800,000 Pa·s; 4) a LCBI equal to or lower than 0.80; and 5) a ratio (?0.02/1000)/LCBI equal to or greater than 350.

Abstract: An object of the present disclosure is to provide a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit and capable of improving an elastic modulus of a rubber composition. Specifically, the present disclosure provides a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit, wherein the difference (Tem?Tim) between an extrapolated melting end temperature (Tem) as measured in accordance with JIS K7121 and an extrapolated melting initiation temperature (Tim) as measured in accordance with JIS K7121 is not higher than 60° C.

Abstract: A self-healing hydraulic seal is provided. The self-healing hydraulic seal is prepared from a water-swellable elastomeric composition comprising a base polymer and a plant-based polysaccharide.

Abstract: A preparation method of a powdery polycarboxylate superplasticizer is provided, including: mixing a superplasticizer monomer with water to produce a mixture, heating and melting the mixture to produce a melt system; carrying out a bulk polymerization reaction by adding an initiator, a chain transfer agent and an unsaturated carboxylic acid into the melt system, forming a polycarboxylate superplasticizer precursor; and neutralizing and pulverizing the polycarboxylate superplasticizer precursor to produce a powdery polycarboxylate superplasticizer. Water is added in the bulk polymerization and reacts with the superplasticizer monomer and the unsaturated carboxylic acid. While the bulk polymerization reaction is guaranteed to be efficiently carried out and the solid polycarboxylate superplasticizer is formed, the viscosity of a bulk polymerization reaction system is reduced. The superplasticizer is suitable for dry-mixed mortar, high-efficiency concrete and other products.

Abstract: A process for producing polyethylene polymers including contacting ethylene and at least one C3 to C8 alpha-olefin comonomer with a polymerization catalyst on a particulate support in a fluidized bed polymerization reactor under conditions effective to polymerize at least part of the ethylene and comonomer and produce the polyethylene polymers, wherein the support has a d10 particle size as measured by laser diffraction of at least 18 microns, is provided.