A method for producing a polymer latex, includes a step of emulsifying a polymer solution of a synthetic polyisoprene and/or a styrene-isoprene-styrene block copolymer, in water in the presence of a rosin and/or a rosin metal salt, thereby obtaining an emulsified liquid, wherein the rosin and/or the rosin metal salt to be used have/has a total content rate of abietic acid, neoabietic acid and palustric acid, and salts thereof, of 5% by weight or less.

The present invention relates to a method of preparing reduced graphene oxide, incorporation of the reduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomeric articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of the reduced graphene oxide into polyisoprene latex is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability, and polyisoprene latex films produced the composite exhibit good mechanical properties with improved ageing resistance.

The present invention relates to a method of preparing reduced graphene oxide, incorporation of the reduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomeric articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of the reduced graphene oxide into polyisoprene latex is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability, and polyisoprene latex films produced the composite exhibit good mechanical properties with improved ageing resistance.

An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.

A shoe cover is a natural latex article with reduced amount of sulfur cross linking agent and accelerators including zinc dithiocarbamate that break catalytically soluble sulfur S.sub.8 sulfur rings forming sulfur linear chains. Surfactants present in the pre-vulcanization composition wets natural polyisoprene particles and permeates small sized sulfur into the interior of these particles thereby pre-vulcanizing the particles. The latex emulsion also has post-vulcanization composition with accelerators that crosslink between particles during the post vulcanization cure cycle. The dipped natural polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds and zinc segregation at the boundaries or original particles. The natural rubber films exhibit high tensile strength, tensile modulus, tear strength, elongation with low modulus of the shoe cover. The bottom surface of the shoe cover is etched to produce a slip resistant surface.

A polymer particle manufacturing method according to the present invention includes: (i) mixing a dispersion A5 of polymer particles A3 with a reactant, the dispersion A5 including the polymer particles A3 and a first solvent 4 in which the polymer particles A3 are dispersed, the polymer particles A3 being formed from a structurally controlled polymer having an organotellurium group 1 at a growing end thereof, the polymer being synthesized by an emulsion polymerization with use of a first organotellurium compound as a polymerization control agent, the reactant being soluble in the first solvent 4; and removing the organotellurium group 1 from the growing end of the polymer to obtain a liquid mixture 8 including a second organotellurium compound 6 generated by a reaction between the reactant and the organotellurium group 1 and polymer particles B7 having an organotellurium group 1 reduced relative to the organotellurium group 1 in the polymer particles A3; and (ii) separating, from the liquid mixture 8, the polymer particles B7 and a solution 9 in which the second organotellurium compound 6 is dissolved from each other.

A polymer particle manufacturing method according to the present invention includes: (i) mixing a dispersion A5 of polymer particles A3 with a reactant, the dispersion A5 including the polymer particles A3 and a first solvent 4 in which the polymer particles A3 are dispersed, the polymer particles A3 being formed from a structurally controlled polymer having an organotellurium group 1 at a growing end thereof, the polymer being synthesized by an emulsion polymerization with use of a first organotellurium compound as a polymerization control agent, the reactant being soluble in the first solvent 4; and removing the organotellurium group 1 from the growing end of the polymer to obtain a liquid mixture 8 including a second organotellurium compound 6 generated by a reaction between the reactant and the organotellurium group 1 and polymer particles B7 having an organotellurium group 1 reduced relative to the organotellurium group 1 in the polymer particles A3; and (ii) separating, from the liquid mixture 8, the polymer particles B7 and a solution 9 in which the second organotellurium compound 6 is dissolved from each other.

A composite article can comprise a composite body including an organic polymer and ceramic particles comprising hexagonal boron nitride (hBN) particles distributed throughout the organic polymer, wherein an amount of the hBN particles ranges from 20 vol % to 40 vol % based on a total volume of the body; and the body comprises an in plane thermal conductivity of at least 10 W/mK. The hBN particles within the composite body can have a March-Dollase Orientation parameter η of at least 50%.

A composite article can comprise a composite body including an organic polymer and ceramic particles comprising hexagonal boron nitride (hBN) particles distributed throughout the organic polymer, wherein an amount of the hBN particles ranges from 20 vol % to 40 vol % based on a total volume of the body; and the body comprises an in plane thermal conductivity of at least 10 W/mK. The hBN particles within the composite body can have a March-Dollase Orientation parameter η of at least 50%.

A glove including a cured film of an elastomer containing a (meth)acrylonitrile-derived structural unit, an unsaturated carboxylic acid-derived structural unit and a butadiene-derived structural unit in a polymer main chain, wherein the elastomer contains 20 to 40% by weight of a (meth)acrylonitrile-derived structural unit, 1 to 10% by weight of an unsaturated carboxylic acid-derived structural unit and 50 to 75% by weight of a butadiene-derived structural unit, and has a crosslinked structure of a carboxyl group in the unsaturated carboxylic acid-derived structural unit with an epoxy crosslinker containing an epoxy compound having three or more epoxy groups in one molecule.