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AssigneesSumitomo Rubber Industries, Ltd., Kao Corporation
InventorsNaoya Ichikawa, Yoshiaki Miyamoto
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The present invention provides a deproteinized natural rubber latex wherein coagulation of a rubber component does not occur when the concentration of calcium ions (Ca2+) is 0.01 mol/L or less and coagulation of the rubber component occurs when the concentration of Ca2+ is 0.1 mol/L or more; a method of preparing the deproteinized natural rubber latex, which comprises adding a protease and two or more surfactants having different coagulation properties to calcium ions (Ca2+) to a natural rubber latex and maturing the natural rubber latex; a rubber product using the deproteinized natural rubber latex; and a proteolytic agent comprising a protease and two or more surfactants. The deproteinized natural rubber latex is a latex wherein rubber molecules are dispersed and stabilized by a surfactant, and also have good film forming properties by means of the anode coagulation method and is less likely to cause uneven thickness of the film and liquid dripping even when a mold is dipped repeatedly in a latex on formation of a rubber film.
A deproteinized natural rubber latex which is obtained by subjecting to a treatment for decomposition and removal of a protein, wherein coagulation of a rubber component does not occur when the concentration of calcium ions (Ca2+) is 0.01 mol/L or less and coagulation of the rubber component occurs when the concentration of Ca2+ is 0.1 mol/L or more.
A method of preparing a deproteinized natural rubber latex, which comprises adding a protease and two or more surfactants having different coagulation properties to calcium ions (Ca2+) to a natural rubber latex, and maturing the natural rubber latex, wherein the two or more surfactants are stably dispersed when the concentration of Ca2+ of an aqueous solution (25° C.) containing the surfactants is 0.1 mol/L or less, and are coagulated when Ca2+ of the aqueous solution is 1.0 mol/L or more.
A method of preparing a natural rubber latex, which comprises subjecting a natural rubber latex to a treatment for decomposition of a protein due to a protease and a treatment for removal of a protein due to centrifugation, and dispersing the resulting creamy rubber solid content in an aqueous medium,
A proteolytic agent for natural rubber latex, comprising a protease and two or more surfactants having different coagulation properties to calcium ions (Ca2+),
Dependencies are inferred from the claim text.