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AssigneeAllegiance Corporation
InventorsShiping Wang, Yun-Siung Tony Yeh, Randell Wenig, Wong Weicheong
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The invention disclosed herein relates to an improved process for making elastomeric polyisoprene articles. In particular, the process of the invention is a system which 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.
A latex composition comprising a polyisoprene latex, a milk protein salt, and an accelerator composition comprising a plurality of accelerators, wherein the latex composition is stable after storage for at least about 5 days, as measured by the ability of the stored latex composition to be used to form elastomeric articles having a tensile strength of at least about 3000 psi.
A polyisoprene latex composition comprising a caseinate sale selected from the group consisting of sodium caseinate sale, potassium caseinate salt, manganese caseinate salt, zinc caseinate salt, and combinations thereof, and an accelerator composition, wherein elastomeric articles produced using the polyisoprene latex composition exhibit two or more of the following properties:
Dependencies are inferred from the claim text.