Deproteinized natural rubber latex, method for preparing it, rubber product and uses proteolytic agent for natural rubber latex deproteinization of.

摘要

A natural rubber latex deproteinized obtainable by adding a natural rubber latex a protease and two or more surfactants having different coagulation properties to calcium ions (Ca2 +), maturing the natural rubber latex and removing proteins or products of its decomposition, characterized in that one of the at least two surfactants selected from anionic type ester salts ether sulfates higher alkyl and phenyl and anionic type ester salts ether sulfates higher alkyl and has low coagulation properties to Ca 2+ so dispersed stably when the concentration of Ca2 + of an aqueous solution at 25 ° C containing the surfactant is 0.1 mol / l or less, and the other of the at least two surfactants is selected anionic surfactants of the type of carboxylic acids, anionic type sulfate ester salt higher alcohols, anionic type sulfonic acid and anionic-type phosphoric acids and has high coagulation properties to Ca 2+ so coagulated when the Ca 2+ concentration of an aqueous solution at 25 ° C containing the surfactant is 1.0 mol / l or more, and that the weight ratio of the surfactant having low coagulation properties to Ca 2+ to the surfactant having high coagulation properties to Ca 2+ is from 85:15 to 30:70.