Patent ID: 7172650

Claim:
A proteolytic agent for natural rubber latex, comprising a protease and two or more surfactants having different coagulation properties to calcium ions (Ca 2 +), wherein the two or more surfactants are stably dispersed when the concentration of Ca 2 + of an aqueous solution (25Â° C.) containing the surfactants is 0.1 mol/L or less, and are coagulated when Ca 2 + of the aqueous solution is 1.0 mol/L or more; wherein the two or more surfactants include: at least one surfactant H selected from the group consisting of carboxylic acid anionic surfactant, higher alcohol sulfate ester salt anionic surfactant, sulfonic acid anionic surfactant and phosphoric acid anionic surfactant, and at least one surfactant L selected from the group consisting of higher alkyl phenyl ether sulfate ester salt anionic surfactant and higher alkyl ether sulfate ester salt anionic surfactant; and wherein a ratio of the content of the surfactant H to the surfactant L is within a range from 15:85 to 70:30 by weight ratio.