The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2013
Filed:
Aug. 31, 2010
Yoshimasa Yamamoto, Nagaoka, JP;
Seiichi Kawahara, Nagaoka, JP;
Oraphin Chaikumpollert, Nagaoka, JP;
Phan Trung Nghia, Hanoi, VN;
Yoshimasa Yamamoto, Nagaoka, JP;
Seiichi Kawahara, Nagaoka, JP;
Oraphin Chaikumpollert, Nagaoka, JP;
Phan Trung Nghia, Hanoi, VN;
Abstract
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.