Polyisoprene articles and process for making the same

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 9/10 (2006.01) C08J 5/02 (2006.01) C08K 5/31 (2006.01) C08K 5/39 (2006.01) C08K 5/47 (2006.01) C08L 89/00 (2006.01)

Patent

CA 2408626

The invention disclosed herein relates to an improved process for making elastomeric polyisoprene articles. In particular, the process of the invention is a system wich produces synthetic polyisoprene articles exhibiting tensile strength properties similar to that of solvent-based processes using natural rubber latex. The process comprises an accelerator composition at the pre-cure stage comprising a dithiocarbamate, a thiazole and a guanidine compound. In a preferred embodiment, the accelerator composition comprises zinc diethyldithiocarbamate (ZDEC), zinc 2-mercaptobenzothiazole (ZMBT) and diphenyl guanidine (DPG), in conjunction with a stabilizer, such as sodium caseinate, The invention also includes an elastomeric polyisoprene product made by the process, such as a surgeon's glove.

La présente invention concerne un processus amélioré de fabrication d'articles de polyisoprène élastomères. Le processus de cette invention est en particulier un système qui produit des articles de polyisoprène synthétiques présentant des propriétés de résistance à la traction similaires à celles obtenues par un processus à base de solvant utilisant du latex caoutchouc naturel. Ce processus met en oeuvre une composition d'accélérateur à l'étape de la pré-réticulation comprenant un composé dithiocarbamate, un composé thiazole et un composé guanidine. Dans un mode préféré de réalisation de l'invention, la composition d'accélérateur comprend diéthyldithiocarbamate de zinc (ZDEC), 2-mercaptobenzothiazole de zinc (ZMBT) et guanidine diphényle (DPG), avec un stabilisateur tel que le caséinate de sodium. Cette invention concerne aussi un produit de polyisoprène élastomère fabriqué par ce processus, tel qu'un gant de chirurgien.

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