Title: Process for producing raw rubber
Application Number: 94106007 Application Date: 1994.05.13
Publication Number: 1096302 Publication Date: 1994.12.14
Approval Pub. Date: 2001.05.09 Granted Pub. Date: 2001.05.09
International Classifi-cation: C08C1/14
Applicant(s) Name: Kao Corporation Address:
Inventor(s) Name: Yasuyuki Tanaka;Yuichi Hioki;Masaharu Hayashi;Yasu
Attorney & Agent: LUO CAIXI MENG BAYI
Abstract:
    A process for producing raw rubber from a deproteinized natural rubber is disclosed, which comprises coagulating rubber particles in the deproteinized natural rubber latex by: (1) adding a nonionic surfactant having a cloud point of from 20 DEG to 100 DEG C. and a molecular weight of 300 or more to the deproteinized natural rubber latex and heating the latex to a temperature not lower than the cloud point of the nonionic surfactant; or (2) adding a coagulation assistant selected from the group and then recovering the coagulated rubber particles. According to the process of the present invention, raw rubber containing substantially no metal ion can be produced with a high efficiency.
Time: 10