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 S8 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 non-aqueous inkjet ink comprising a near infrared absorbing particle, a dispersant, a solvent, the dispersant is a polymer comprising an amine group or an acidic group and the solvent is selected from the group consisting of ketones, esters, ethers and alcohols. The non-aqueous inkjet ink can act as a fusing agent in a high speed sintering process. The non-aqueous inkjet ink is suitable for printing transparent or coloured 3D-objects.

The present invention provides a method for preparing a plurality of condoms, comprising compounding one or more compositions comprising natural rubber latex to make a first batch of compounded latex, compounding one or more compositions comprising natural rubber latex to make a second batch of compounded latex, optionally, blending said first and second batches of compounded latex to make a compounded latex blend. A plurality of formers is dipped into the compounded latex blend to form a plurality of condoms, or a plurality of formers is dipped into the first batch of compounded latex to form a plurality of condoms and then said plurality of formers is dipped into the second batch of compounded latex to form a plurality of condoms. Each of the one or more compositions comprising natural rubber latex, which are used to make the first and second batch of compounded latex, has a zinc content less than 60 ppm. The invention further provides a plurality of condoms obtained or obtainable by this method.

A method for producing a dip-molded article, including a dip-molding step of dip-molding a latex composition containing a latex of a carboxyl group-containing conjugated diene-based rubber (A) and a water-soluble metal compound (B) using a dip mold to form a dip-molded layer on the surface of the dip mold; a moisture content adjustment step of adjusting the moisture content of the dip-molded layer formed on the surface of the dip mold to 1 to 30 wt %; and a beading step of performing beading after the adjusting of the moisture content, the beading including peeling a portion of the dip-molded layer formed on the surface of the dip mold from the dip mold.

The present invention relates to a polymer latex composition, to a method for the preparation of such polymer latex composition, to the use of said polymer latex composition, to a compounded latex composition comprising said polymer latex composition, to a method for making dip-molded articles, to a method for making elastomeric films and articles, to a method for repairing of reforming an elastomeric film or article and to articles made by using said polymer latex composition.

Highly dispersed, highly filled, low viscosity liquid compositions and uses thereof. A composition can include a carrier fluid, a plurality of nano- and micro-sized particles, and multiple dispersants. A carrier fluid can comprise nonpolar organic liquids. A plurality of particles can comprise inorganic particles. A portion of dispersants can exhibit different association affinities for nano-versus micro-sized particles. A composition can be free of water, other solvents, or diluents. A composition can comprise 30 weight % or greater of particles. A composition can exhibit a consistent viscosity of about 1000 centipoise or lower at about 25 C. A curable composition can comprise curable carrier fluids, such as, for example, monomers and/or oligomers. A composition can be utilized in chemical processing, microfluidics, colloidal fluids, 3D printing, coatings, and other types of additive manufacturing. An object can be made, for example, by vat polymerization 3D printing of one or more curable composition(s).

Embodiments of functionally graded pure and composite 3D printed articles having nonporous regions and porous regions are described. In one example, a printed composite article includes a polymer matrix including a porous region. The printed composite article further includes a plurality of liquid metal elements embedded in the polymer matrix. In another example, a printed article includes a polymer matrix including a nonporous region and a porous region adjacent to and at least partly integrated with or coupled to the nonporous region. The porous region includes porous polymer material having an increasing porosity or a decreasing porosity in at least one direction relative to a longitudinal axis of at least one of the polymer matrix or the printed article.

A method for manufacturing biotic gloves and a hypoallergenic biotic glove are provided. The method includes dipping the molds into a coagulant solution and performing a pre-vulcanization treatment using alkaline protease, ultraviolet irradiation, and polyols derived from cellulose materials. The latex-coated molds undergo drying, washing, vulcanization with specific curing agents and accelerators, chlorine washing, and a secondary dipping in polyurethane to form a hypoallergenic inner layer. The resulting gloves feature a multilayer structure, including a first layer, a second layer, and a third layer. The first layer includes nitrile butadiene rubber, chloroprene rubber, or isoprene rubber combined with polysaccharide biotic materials. The second layer includes a natural rubber layer or other synthetic rubber combined with polysaccharide biotic materials, and the third layer includes a polyurethane layer. The final gloves have a biotic content of 3-40%, a tensile strength of 14-40 MPa, and an elongation at break of 350-800%.

A method of making a powder polyvinyl chloride-based composition comprises blending an emulsion of a polyvinyl chloride resin and a flexible acrylic resin to form a polyvinyl chloride resin/flexible acrylic resin blend. The polyvinyl chloride/flexible acrylic resin blend is isolated to form the powder polyvinyl chloride-based composition. A powder polyvinyl chloride-based composition, a polyvinyl chloride formulation, an article formed from the powder polyvinyl chloride-based composition, and a method for forming the article are also disclosed.