A method and a device for manufacturing a rubber coated cord, comprising: a rubber coated cord including a preceding cord is manufactured by causing the preceding cord to pass through a preceding head while filling the preceding head with unvulcanized rubber extruded from a rubber extruder, and a rubber coated cord including a next cord is manufactured by setting a leading edge portion of the next cord in a state where the leading edge portion of the next cord has passed through the next head in advance, manufacturing a predetermined length of the rubber coated cord including the preceding cord, and subsequently causing the next cord including a leading edge portion side range bonded to a trailing edge portion of the rubber coated cord including the preceding cord to pass through the next head while switching from the preceding head to the next head.

A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises insoluble amorphous sulfur extracted with zinc dithiocarbamate catalyst at 20° C. to form sulfur chain and transported to interior of synthetic polyisoprene particle forming physical attachment of sulfur to active sites. The degree of pre-vulcanization is verified by expansion of cast and dried film of latex in toluene in 20 minutes by means of a swelling index test. The latex emulsion is vulcanized at 90° C. to 120° C. for 3 to 5 minutes. Post-vulcanization composition with accelerators crosslink between synthetic polyisoprene particles, uniformly curing both in the inter-particle and intra-particle regions to produce high cross link density, uniform distribution of double bonds with zinc segregation at the boundaries of original particles. The condom exhibits high tensile strength, tensile modulus, elongation with excellent tear strength releasing below 10 ppb of nitrosamines.

The invention provides a novel hydrophilic polymer and rubber polymer microparticles blend coating formulation and compositions thereof for rubber gloves to improve wet donning properties for easy application. More particularly, the invention relates to a novel hydrophilic polymer and rubber polymer microparticles blend coating formulation and compositions thereof, and their use on gloves to form hydrophilic and flexible coatings with durable lubricity. The gloves of the invention exhibit good donnability, tensile strength, elongation to break, and stress at 500% elongation.

A composition for a direct ink writing includes a polymeric component in latex form, where the latex includes greater than 75% solids content; and additives adapted to provide the composition with capability of being utilized as a rubber ink formulation for the direct ink writing process. A method of producing an additive manufacturing product includes steps of providing an initial polymeric component in latex form, where the initial polymeric component in latex form includes from about 50% to about 70% solids content; removing water from the initial polymeric component in latex form to thereby form a subsequent polymeric component in latex form, where the subsequent polymeric component in latex form has greater than 75% solids content; and mixing the subsequent polymeric component in latex form with additives adapted to provide a rubber ink formulation composition; and additive manufacturing the rubber ink formulation composition to thereby form a green component.

An extruder is disclosed including: a barrel; and a screw provided with a helical groove; wherein the screw comprises a dewatering portion comprising a first portion, and a second portion at a location downstream from the first portion; wherein, at the dewatering portion, clearance between the groove and the barrel decreases as one proceeds downstream; and wherein clearance reduction ratio at the first portion is greater than clearance reduction ratio at the second portion.

Examples of a three-dimensional (3D) printing kit include a particulate build material and a binder fluid. The particular build material includes from about 80 wt % to 100 wt % metal particles based on a total weight of the particulate build material. In some examples, the binder fluid includes water, polymer latex particles in an amount ranging from about 1 wt % to about 40 wt % based on a total weight of the binder fluid, and a silane coupling agent adhesion promoter in an amount ranging from about 0.05 wt % to about 3 wt % based on the total weight of the binder fluid. In some other examples, the binder fluid includes water and polymer latex particles, and the 3D printing kit further includes an adhesion promoter fluid which includes water and the silane coupling agent adhesion promoter.

Provided is a method of producing a glove, the method including: (1) the step of immersing a glove forming mold in a liquid coagulant containing calcium ions so as to allow the coagulant to adhere to the glove forming mold; (2) the step of adjusting the pH to be 9 or higher using an ammonium compound or an amine compound and leaving a glove emulsion composition to stand with stirring; (3) the dipping step of immersing the glove forming mold, to which the coagulant has thus adhered in the step (1), in the glove emulsion composition; (4) the gelling step of leaving the glove forming mold, to which the glove emulsion composition has thus adhered, to stand at a temperature for a period that satisfy specific conditions; (5) the leaching step of removing impurities from a cured film precursor thus formed on the glove forming mold; (6) the beading step of, after the leaching step, winding the cuff portion of the resulting glove; (7) the precuring step of heating and drying the cured film precursor that has been subjected to the beading step; and (8) the curing step of heating the cured film precursor at a specific temperature for a specific period to obtain a cured film.

A detachable glove comprising at least two layers that are separated by an adhesive layer, wherein the adhesive layer includes a wetting agent, a latex coagulating agent, a synthetic organic polymer and water. A chlorinated detachable bi-layered glove and a method of manufacturing thereof. A polymer coated, detachable, bi-layered glove and a method of manufacturing thereof. A method of peeling a detachable bi-layered glove wherein the method includes (i) pulling cuff area of the outer glove layer until its circumference is detached from the inner glove layer and (ii) peeling off the outer glove layer once the full circumference of the outer glove layer is detached from the inner glove layer to yield the inner glove layer for further usage.

An integrated multi-color animal chew toy and preparation process thereof, including selecting N types of rubbers used to form a product, wherein the rubbers have different colors and different hardness; selecting one type of rubber from the rubbers used to form the product, putting the rubber selected into a first mold, and performing mold forming to form a first molded product; putting part of the first molded product into a second mold, closing the second mold, and then injecting a second rubber selected from the rubbers used to form the product for mold forming to form a second molded product; putting part of the second molded product into a Nth mold, closing the Nth mold, and then injecting a Nth rubber selected from the rubbers used to form the product for mold forming, and then cooling to obtain the product completely.

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.