公开(公告)号：US5710200A

公开(公告)日：1998-01-20

申请号：US522221

申请日：1995-09-01

申请人： Hirotoshi Toratani ,  Eiji Nakamura ,  Hideki Aoyama ,  Yasushi Hirata

发明人： Hirotoshi Toratani ,  Eiji Nakamura ,  Hideki Aoyama ,  Yasushi Hirata

IPC分类号： C08K5/25 ,  C08K5/24 ,  C08F8/30

CPC分类号： C08K5/25

摘要： 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.

摘要翻译： 在干燥条件下处理含有粘度稳定剂的天然橡胶，其干燥前后的凝胶含量差异和分子量保持率为85％以上，10％以下，天然橡胶的制造方法包括在干燥条件下进行处理 导致干燥前后的凝胶含量的差异为10％以下，分子量保持率为85％以上。 含有天然橡胶的粘度稳定剂用过滤器进行处理，天然橡胶的制造方法包括在将硬脂酰肼混合到天然橡胶中后用过滤器进行处理。 抑制凝胶化（保存硬化），防止分子量的降低。

公开(公告)号：US5693695A

公开(公告)日：1997-12-02

申请号：US518838

申请日：1995-08-24

申请人： Hirotoshi Toratani ,  Yasushi Hirata

发明人： Hirotoshi Toratani ,  Yasushi Hirata

IPC分类号： C09K3/00 ,  C08C1/00 ,  C08C3/00 ,  C08K5/16 ,  C08K5/25 ,  C08L7/00 ,  C08K5/20

CPC分类号： C08K5/25

摘要： Natural rubber contains a viscosity stabilizer for the natural rubber, and the viscosity stabilizer includes a hydrazide compound of the following general formula, R--CONHNH.sub.2 wherein R is an alkyl group having 1 to 5 carbon atoms or a cycloalkyl group having 3 to 5 carbon atoms. As a result, gelation (storage hardening) is suppressed and a decrease in molecular weight is prevented.

摘要翻译： 天然橡胶含有天然橡胶的粘度稳定剂，粘度稳定剂包括下列通式的酰肼化合物：R-CONHNH 2，其中R是具有1至5个碳原子的烷基或具有3至5个碳原子的环烷基 。 结果，抑制了凝胶化（储存硬化），并且防止了分子量的降低。

公开(公告)号：US06531527B2

公开(公告)日：2003-03-11

申请号：US09881107

申请日：2001-06-15

申请人： Hirotoshi Toratani ,  Ken Kijima ,  Takatsugu Hashimoto

发明人： Hirotoshi Toratani ,  Ken Kijima ,  Takatsugu Hashimoto

IPC分类号： C08K500

CPC分类号： C08K5/25 ,  C08L7/00

摘要： 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.