Natural rubber treated with viscosity stabilizers and production thereof.

摘要

A method of manufacturing natural rubber, which comprises drying and compounding one or more viscosity stabilizers for natural rubber comprising hydrazide compounds of the following general formula, R-CONHNH2 where R is selected from alkyl groups having 1 to 30 carbon atoms, cycloalkyl groups having 3 to 30 carbon atoms, and aryl groups. Preferred methods for manufacturing natural rubber comprise treating under drying conditions to result in 10% or less of the difference of gel content and 85% or more of molecular weight retention between before and after drying; and treating with a strainer after compounding hydrazide stearate into the natural rubber. Gelation (storage hardening) is suppressed and a decrease in molecular weight is prevented, by means of the invention.