Low protein natural latex articles

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 41/14 (2006.01) B29C 71/00 (2006.01) C08C 3/02 (2006.01) C08J 5/02 (2006.01) C08J 7/00 (2006.01)

Patent

CA 2494830

The present invention is directed to a process for producing a powder free natural latex article and the articles produced by the process. In one embodiment, the process of the present invention may be used to form a powder free natural latex glove which has very low levels of extractable protein without being subjected to a halogenation processes. The process includes forming a natural rubber article on a former and then, either before or after stripping the article from the former, contacting the article with a rinse solution comprising the ionic species of a disassociated metal salt. In one embodiment, the metal salt may be sodium chloride. Contact with the rinse solution may lower protein levels in the latex. When the article is stripped from the former prior to contact with the rinse solution, the rinse solution may also remove any residual powders from the glove in order to produce a powder free natural rubber article. The non-chlorinated product may have good gripping characteristics and an extended shelf life when compared to similar chlorinated products.

La présente invention concerne un processus pour produire un article en latex naturel exempt de poudre et les articles fabriqués lors de ce processus. Dans un mode de réalisation, le processus de la présente invention peut s'utiliser pour former un gant en latex naturel exempt de poudre présentant des taux très faibles de protéine extractible sans utilisation de processus d'halogénation. Le processus consiste à former un article en caoutchouc naturel sur une forme puis, soit avant soit après l'enlèvement de l'article de la forme, à mettre l'article en contact avec une solution de rinçage comprenant des espèces d'ions d'un sel de métal qui n'est plus associé. Le contact avec la solution de rinçage permet de réduire les taux de protéine dans le latex. Lorsque l'article est enlevé de la forme avant d'être mis en contact avec la solution de rinçage, ladite solution de rinçage permet aussi d'évacuer du gant toute poudre résiduelle afin de produire un article en caoutchouc naturel exempt de poudre. Le produit non chloré peut présenter de bonnes caractéristiques de prise et une durée de conservation plus grande en comparaison aux produits chlorés similaires.

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