The present invention relates to a method (100) for preparing a pre-treated synthetic latex emulsion, the method comprising the steps of, adding a synthetic latex into a tank (101), characterized by mixing a surfactant with the synthetic latex in the tank (102), adding alkaline material into a mixture of the synthetic latex added with the surfactant (103), adding a reactive metal ion into the mixture (104) and continue mixing the mixture for at least two hours (105), wherein the reactive metal ion is obtained by heating a metal oxide or metal hydroxide with supply of alkaline material at 120 to 180° C.

A resin film comprising a multilayer structure acrylic polymer and the film having an acid value of not more than 0.018 mmol/g in an acetone insoluble matter, an acid value of not more than 0.012 mmol/g in an acetone soluble matter, a glass transition temperature of not less than 80° C. and a thickness of 5 to 300 μm is obtained by a method comprising emulsion polymerization for producing a latex comprising multilayer structure acrylic polymer, coagulating the latex comprising the multilayer structure acrylic polymer to obtain a slurry, washing and dehydrating the slurry, drying the dehydrated slurry to remove the multilayer structure acrylic polymer, mixing 0 to 35% by mass of an acrylic resin and 65 to 100% by mass of the removed multilayer structure acrylic polymer and subjecting the resultant mixture melted to an extrusion molding.

The present invention provides a cosmetic composition carrier comprising a latex foam having a density of 0.05-0.2 g/cm.sup.3 and a cosmetic product comprising same. The cosmetic composition carrier according to the present invention has excellent filling, holding, and discharge capabilities with respect to a liquid cosmetic, has excellent antibacterial activity, can be filled with, hold, and discharge liquid cosmetic compositions in a wide range of low to high viscosities, thus allows excellent color expression and uniform application without caking when a liquid cosmetic composition held in the cosmetic composition carrier is applied to the skin, and allows the application of the liquid cosmetic composition to a portable container.

Provided are various gloves and protective articles with improved donning characteristics. The glove comprises an interior surface, and a polymer system coating the interior surface. The polymer system comprises one or more first polymers, each including an average particle size between 100 nanometers (nm) to 400 nm. The polymer system further comprises one or more second polymers, each including an average particle size in excess of 500 nm. The one or more first polymers may comprise a combination of one or more polymers including: butadiene based polymer and copolymer latices, isoprene based polymer and copolymer latices, copolymer latices prepared from styrene and acrylic monomers, and polyurethane copolymers. The one or more second polymers may include vinyl acetate polymers. The glove may be an elastomeric rubber glove coated with the polymer system in an amount between 0.0004 grams and 0.0016 grams on a dry basis.

A method for producing a polymer latex includes: a preparation step of reducing the weight average molecular weight of a conjugated diene polymer (A) by 20 to 70 mass %, thereby obtaining an organic solvent solution containing a conjugated diene polymer (B) having a weight average molecular weight lower than that of the conjugated diene polymer (A); and an emulsification step of emulsifying the organic solvent solution in water in the presence of a surfactant, thereby obtaining a polymer latex.

The present invention relates to thermoplastic molding compounds F containing at least two graft rubbers P-I and P-II which are processed by the co-precipitation of a mixture of the respective emulsions containing P-I and P-II. The present invention further relates to a method for producing such thermoplastic molding compounds F and to molded bodies obtained from a thermoplastic molding compound F according to the invention.

A masterbatch manufacturing method comprising: an operation in which a natural rubber latex, and a rubber latex having a mass-average molecular weight that is less than a mass-average molecular weight of the natural rubber latex, are mixed to obtain a pre-slurry-mixing rubber latex for which a mass-average-molecular-weight-to-number-average-molecular-weight ratio is 6 to 10; an operation in which the pre-slurry-mixing rubber latex and a filler slurry are mixed to obtain a pre-coagulation liquid mixture; and an operation in which the pre-coagulation liquid mixture is coagulated.

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.

A method for producing a synthetic polyisoprene latex, including a step of mixing a latex of synthetic polyisoprene (A) synthesized by use of a Ziegler type catalyst and a latex of synthetic polyisoprene (B) synthesized by use of an organic alkali metal catalyst at a weight ratio of “synthetic polyisoprene (A): synthetic polyisoprene (B)=10:90 to 90:10”. In the method, preferably, the weight average molecular weight of the synthetic polyisoprene (A) is 100,000 to 3,000,000 and the weight average molecular weight of the synthetic polyisoprene (B) is 1,000,000 to 5,000,000.

The present disclosure relates to synthetic polyisoprene elastomeric articles including: one or more cured blend compositions of pre-vulcanized synthetic polyisoprene particles and non-prevulcanized synthetic polyisoprene particles, wherein the pre-vulcanized synthetic polyisoprene particles and the non-prevulcanized synthetic polyisoprene particles are bonded by mono-sulfidic and/or di-sulfidic, and poly-sulfidic crosslinks, wherein the poly-sulfidic crosslinks are present in an amount of 60 to 79 percent of the total amount of crosslinks in the cured blend composition. Methods of making synthetic polyisoprene elastomeric articles such as gloves or condoms is also disclosed.