Bridgestone Corporation

Hirotoshi Toratani

Yasushi Hirata

Eiji Nakamura

Takatsugu Hashimoto

Hideki Aoyama

Ken Kijima

A production process for a viscosity-stabilizer-containing natural rubber comprising a step of adding a viscosity stabilizer liquid diluted with a solvent to a natural rubber, and a viscosity-stabilizer-containing natural rubber latex to which added is a viscosity stabilizer dissolved in an aliphatic chain compound, and a viscosity-stabilizer-containing natural rubber obtained by adding a viscosity stabilizer liquid diluted with a solvent to a natural rubber after it was coagulated.

Viscosity-stabilizer-containing natural rubber latex and natural rubber and a production process thereof

Natural rubber containing viscosity stabilizers is treated 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 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. Natural rubber containing viscosity stabilizers is treated with a strainer, and methods for manufacturing natural rubber comprise 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.

Natural rubber treated with viscosity stabilizers and production thereof

Natural rubber contains a viscosity stabilizer for the natural rubber, and the viscosity stabilizer includes a hydrazide compound of the following general formula,

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Tokyo, Japan

Hirotoshi Toratani