Invention Grant
- Patent Title: Natural rubber containing viscosity stabilizer and method for manufacturing the same
- Patent Title (中): 含有粘度稳定剂的天然橡胶及其制造方法
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Application No.: US518838Application Date: 1995-08-24
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Publication No.: US5693695APublication Date: 1997-12-02
- Inventor: Hirotoshi Toratani , Yasushi Hirata
- Applicant: Hirotoshi Toratani , Yasushi Hirata
- Applicant Address: JPX Tokyo
- Assignee: Bridgestone Corporation
- Current Assignee: Bridgestone Corporation
- Current Assignee Address: JPX Tokyo
- Priority: JPXHEI6-206189 19940831
- Main IPC: C09K3/00
- IPC: C09K3/00 ; C08C1/00 ; C08C3/00 ; C08K5/16 ; C08K5/25 ; C08L7/00 ; C08K5/20
Abstract:
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.
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