Exterior-coated nitrile rubber article having natural rubber...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 9/04 (2006.01) A41D 19/00 (2006.01) A61B 19/04 (2006.01) C08J 7/04 (2006.01)

Patent

CA 2639874

A material for making elastomeric nitrile rubber articles is disclosed. In particular, the process and material formulation can produce nitrile rubber based articles, which exhibit force-strain characteristics that are comparable to those of natural rubber latex articles, while maintaining the tensile strength properties of nitrile rubber. The process includes an accelerator composition at the pre-cure stage having a dithiocarbamate, a thiazole, and a guanidine compound. The invention also includes an elastomeric nitrile rubber product made by the process, such as examination, surgical, or work gloves, which can have an exterior coating over naked rubber selected from either a silicone emulsion or oil, glycerin solution, a combined mixture of silicone and glycehn/glycerol, a fluorocarbon release agent, or a natural or synthetic hydrocarbon-based oil in amounts that do not degrade said substrate rubber material.

L'invention concerne une matière servant à fabriquer des articles en caoutchouc nitrile élastomère. En particulier, le procédé et la formulation de matière peuvent produire des articles à base de caoutchouc nitrile, lesquels présentent des caractéristiques de force-déformation qui sont comparables à celles d'articles en latex de caoutchouc naturel, tout en conservant les propriétés de résistance à la rupture par traction du caoutchouc nitrile. Le procédé comprend, au niveau de la phase de durcissement préalable, une composition d'accélérateur ayant un dithiocarbamate, un thiazole et un composé de guanidine. L'invention concerne également un produit en caoutchouc nitrile élastomère fabriqué par le procédé, tel que des gants d'examen, chirurgicaux ou de travail, lequel peut avoir sur le caoutchouc nu un revêtement extérieur sélectionné parmi l'un quelconque de revêtements constitués d'une émulsion ou d'une huile de silicone, d'une solution de glycérine, d'un mélange combiné de silicone et de glyceth/glycérol, d'un agent antiadhésif de type fluorocarbone ou d'une huile à base d'hydrocarbure naturelle ou synthétique, en quantités qui ne dégradent pas ladite matière en caoutchouc constituant le substrat.

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