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:
Apr. 22, 1997
Filed:
Sep. 12, 1995
Yasuyuki Tanaka, Tokyo, JP;
Toshiaki Sakaki, Hyogo, JP;
Atsuko Kawasaki, Hyogo, JP;
Masaharu Hayashi, Wakayama, JP;
Eiji Kanamaru, Tokyo, JP;
Kazuhiko Shibata, Osaka, JP;
Sumitomo Rubber Industries, Ltd., Hyogo, JP;
Kao Corporation, Tokyo, JP;
Fuji Latex Co., Ltd., Tokyo, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A depolymerized natural rubber having a number-average molecular weight of from 2,000 to 50,000 obtained by the depolymerization of a deproteinized natural rubber. A process for the preparation of a depolymerized natural rubber comprises dissolving a deproteinized natural rubber into an organic solvent so as to give a concentration of from 1 to 30% by weight and then carrying out air oxidation of the resulting solution in the presence of a metallic catalyst. The depolymerized natural rubber can provide the same physical properties as ordinary vulcanized rubbers, exhibits no odor or color characteristic to natural rubbers and causes no immediate allergy induced by protein.