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AssigneeNational University Corporation Nagaoka University of Technology
InventorsYoshimasa Yamamoto, Seiichi Kawahara, Oraphin Chaikumpollert, Phan Trung Nghia
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Provided is a protein-free natural rubber for which the risk of inducing allergic reactions is extremely low. Also provided are a latex of said rubber and a method for efficiently manufacturing said rubber and latex. In the provided manufacturing method, a urea compound, a surfactant, and a polar organic solvent are added to a natural rubber latex, and the proteins in said latex are denatured and then removed. This results in a protein-free rubber latex having a nitrogen content of at most 0.001% as measured by an RRIM test. Also, the amount of protein in a solid rubber obtained by drying the provided natural rubber latex is at most 0.5 μg/g as measured by an improved Lowry method.
A manufacturing method for protein-free natural rubber latex, wherein a protein content of a solid rubber produced by drying the natural rubber latex manufactured by the method is at a level of 0.001% or less in terms of a nitrogen content, that is measured by an RRIM test method, the method comprising:
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