A continuously hollow device for the transfer of fluids to the human body is provided, which is made in a nanomaterial derived from latex, which chemical composition in based primarily on fats, waxes and several gummy resins obtained from cytoplasm of lactic cells. This biochemically modified material is capable of adjusting its outer and inner diameter, i.e. it enlarges or shrinks according to the needs of the patient. The device corresponds to a needle or the like (catheter), which allows to have a very small diameter so as to be inserted in the patient (minimally invasive procedure) and after a physical excitation of such nanomaterial, it can be extended once inserted in the body so as to allow the intake or discharge of fluids to or from the body through a catheter, probe or the like.

An object of the present invention is to provide a medical rubber composition having excellent non-elution characteristic and gas permeability. The present invention provides a medical rubber composition containing: (a) a butyl rubber, (b) a diene-based rubber containing polybutadiene, (c) a peroxide-based crosslinking agent, and (d) a co-crosslinking agent, wherein an amount of (b) the diene-based rubber in 100 parts by mass of the rubber component composed of (a) the butyl rubber and (b) the diene-based rubber is 15 parts by mass or more and 90 parts by mass or less, and a mass ratio ((d)/(c)) of (d) the co-crosslinking agent to (c) the peroxide-based crosslinking agent is 1.2 or more and 25 or less.

An object of the present invention is to provide a medical rubber composition having excellent non-elution characteristic and gas permeability. The present invention provides a medical rubber composition containing: (a) a butyl rubber, (b) a diene-based rubber containing polybutadiene, (c) a peroxide-based crosslinking agent, and (d) a co-crosslinking agent, wherein an amount of (b) the diene-based rubber in 100 parts by mass of the rubber component composed of (a) the butyl rubber and (b) the diene-based rubber is 15 parts by mass or more and 90 parts by mass or less, and a mass ratio ((d)/(c)) of (d) the co-crosslinking agent to (c) the peroxide-based crosslinking agent is 1.2 or more and 25 or less.

The invention relates to an elastomeric film-forming composition (a) a carboxylated butadiene-based elastomer, (b) polychlorobutadiene in an amount of less than 30% by weight of the polymer content of the composition, and (c) one or more cross-linking agents. The invention also relates to dipped articles, gloves, methods of manufacture and uses involving the composition.

A method of manufacturing a latex rubber article comprises providing a former wherein at least a part of the former comprises a mould surface that forms the shape of the latex rubber article, and applying liquid latex to the mould surface using an applicator that is configured to apply the liquid latex to an applicator area that is smaller than the mould surface. The method further comprises providing relative movement between the applicator and the former to produce a latex coating that covers the mould surface, curing the latex coating on the former to form the latex rubber article, and removing the latex rubber article from the former.

A stopper/piston (510) having a cylindrical body (511) having a front axial end closed by a front wall (513). The hollow cylindrical body (511) includes an outside surface provided with a secondary sealing profile (610), the front wall (513) including a front axial outside surface (631) provided with a coating (635). The front wall (513) includes a primary sealing profile (630) on its radially-outer edge, the front wall (513) and the cylindrical body (511) is made of different materials, the hollow cylindrical body (511) being overmolded on the front wall (513). The front axial outside surface (631) of the front wall (513) includes a deformation profile (633) arranged radially inside the primary sealing profile (630), the deformation profile adapted to deform radially for insertion of the stopper/piston (510) into a syringe body.

A peroxide formulation includes at least one peroxide and at least one compound having a secondary amine group selected from amino acids, such as arginine, folic acid, and polyethyleneamines. The peroxide formulation is capable of curing an aqueous elastomer such as a latex in the full or partial presence of oxygen. Methods of using the peroxide formulation include dip-molding latex elastomer compositions.

The present invention relates to a latex composition for dip-forming including two different types of carboxylic acid modified-nitrile based copolymer latex, and a dip-formed article prepared therefrom having excellent durability for sweat, and having high tensile strength and elongation percentage. Accordingly, the latex composition for dip-forming has excellent tensile strength, elongation percentage, stress and durability, and is useful in industries requiring these, for example, a rubber glove industry and the like.

This application relates to synthetic elastomeric articles, and gloves in particular, comprising the cured product of a synthetic latex composition, the synthetic latex composition comprising a synthetic carboxylated polymer and a cross-linking composition, the cross-linking composition comprising an aqueous solution of a negatively charged multivalent metal complex ion having a pH of at least 9.0. Also described are compositions for forming the articles, and methods for making the articles, based on the use of the described cross-linking composition. The articles so produced have an average thickness of 0.2 mm or less and a modulus at 500% of less than 6.5 MPa.

A latex or natural rubber composition or formulation, latex or rubber products made using the same, and methods of preparing a vulcanized rubber and latex or natural rubber products are disclosed. The composition/formulation includes latex or natural rubber, 0.1-5 phr of a vulcanization activator, and 0.5-10 phr of one or more accelerators and/or additional activators. At least one accelerator and/or additional activator is a nanocomposite zinc oxide. The method includes. mixing a source of the latex or rubber with a vulcanization activator and one or more nanocomposite zinc oxides in a tank or vessel to form a latex or rubber formulation, dipping or at least partially immersing one or more molds or formers in the latex or rubber formulation to form a latex or rubber coating thereon, and curing the latex or rubber coating to vulcanize the latex or rubber coating. The vulcanized latex product is strong and has antimicrobial properties.