The present invention provides a powder-free polymeric coating comprising a latex polymer, a metal oxide and a cross-linking agent, the latex polymer comprising a diene and an acrylic acid; and a powder-free glove comprising the powderless coating polymer.

A seamless polyethylene based glove includes at least 55 wt % of polyethylene. A method of manufacturing seamless polyethylene based disposable gloves includes: forming a curtain of molten polyethylene based material; inserting a plurality of hand molds into the curtain of molten polyethylene based material; and withdrawing the hand molds from the curtain of molten polyethylene based material.

The present invention provides an apparatus for producing and putting on gloves capable of producing gloves that fit an individual hand shape and also putting the glove on the hands, and a method for producing and putting on gloves. The apparatus for producing and putting on gloves comprises welding and cutting means which welds and cuts a first elastic film and a second elastic film at a position on the outer side of a contour of a user's hand in a state in which the user's hand is sandwiched between the first elastic film and the second elastic film.

The present invention relates to a method for preparing large-sized diene-based rubber latex, and an acrylonitrile-butadiene-styrene graft copolymer comprising the same. More particularly, it relates to a method for preparing large-sized diene-based rubber latex having improved impact strength by controlling content and time of addition of a cross-linking agent and an emulsifier having critical micelle concentration (CMC) of 150 mg/L or less during preparation of the large-sized rubber latex, large-sized diene-based rubber latex prepared therefrom, and an acrylonitrile-butadiene-styrene graft copolymer and thermoplastic resin comprising the same.

A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S.sub.8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic 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 in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis. The films exhibit high tensile strength, tensile modulus, tear strength, burst pressure and burst volume.

A novel ultrasonic oscillation-induced sericin extraction method produces a high-molecular-weight sericin solution from silk cocoon threads at room temperature. In one embodiment, unique pH variation-resistant alkaline ionic water is produced from a novel strongly-alkaline ionic water generator device, wherein the unique pH variation-resistant alkaline ionic water is subsequently utilized as a beneficial solvent that contributes to the feasibility of the novel ultrasonic oscillation-induced sericin extraction method at room temperature. The high-molecular-weight sericin solution produced and coated in a glove provides a high coating adhesion for economical manufacturing of sericin-coated gloves, while also providing superb skin moisturizing and protection properties. Furthermore, once coated in a glove, the high molecular weight of sericin beneficially resists a rapid skin seepage of sericin to human skin layers, thereby acting as natural moisturizing factor (NMF) simulants on top of the human skin layers when the glove is worn.

Dipped formed latex articles with improved properties are formed from branched block copolymers, derived from alkenyl aromatic hydrocarbon—1,3-diene monomer system, and branched polyisoprene homopolymers, derived from isoprene. The polymers are obtained by polymerization in the presence of an anionic initiator; at a temperature from 0° C. to 100° C.; followed by coupling with a multifunctional coupling agent of formula (R.sup.1O).sub.3Si—Y—Si(OR.sup.2).sub.3, wherein R.sub.1 and R.sub.2 are independently C.sub.1-C.sub.6 alkyl groups; and Y is a C.sub.2-C.sub.8 alkylene group. The polymers are obtained as rubber cements having high solids content and low zero shear viscosities. The rubber cements are valuable for making latices and latex articles such as dipped goods, e.g., condoms, gloves, etc., with improved properties.

One embodiment of the present invention relates to a chloroprene copolymer latex, a method for producing a chloroprene copolymer latex, a chloroprene copolymer latex composition, and a molded article or dipped product of a chloroprene copolymer rubber. The chloroprene copolymer latex is a latex of a chloroprene copolymer including monomer units derived from 2-chloro-1,3-butadiene (chloroprene) and monomer units derived from 2-methyl-1,3-butadiene, wherein the tetrahydrofuran insoluble content in the chloroprene copolymer is 20% by mass or less, and the proportion of the monomer units derived from 2-methyl-1,3-butadiene is 10 to 27 mol % in the chloroprene copolymer.

A latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex having pKa of 9.5 to 10.2 and satisfying General Formulas 1 and 2.

0.85≤P≤1.0, P=CV.sub.D/CV.sub.0  [General Formula 1]

5≤M≤20, M=m.sub.1×m.sub.2  [General Formula 2] wherein CV.sub.0 represents a capillary viscosity which is measured in a swollen in a methyl ethyl ketone solvent, CV.sub.D represents a capillary viscosity in a deswollen state, m.sub.1 represents an insolubility of a dried film in the methyl ethyl ketone solvent, and m.sub.2 represents a swelling index of the dried film in the methyl ethyl ketone solvent, wherein a carboxylic acid-modified nitrile-based copolymer of carboxylic acid-modified nitrile-based copolymer latex includes: a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit. A molded article having a layer derived from the latex composition is also provided.

A glove that is X-ray detectable prepared from a latex formulation comprises a base polymer, an accelerator, a vulcanizing agent, a surfactant, a pH adjuster, an antifoaming agent and a thickener characterized in that the latex formulation further includes radiocontrast filler, wherein the radiocontrast filler comprises a radiocontrast agent, a surfactant, a thickener and a solvent, wherein the radiocontrast filler is used in an amount of at least 10 phr of the latex formulation and wherein the radiocontrast filler has total solid content of 45%.