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1.发明专利
公开(公告)号：JP2002069103A
公开(公告)日：2002-03-08
申请号：JP2001181803
申请日：2001-06-15
Applicant: BRIDGESTONE CORP
Inventor： TORATANI HIROTOSHI , KISHIMA KEN , HASHIMOTO TAKATSUGU
IPC: C08C1/06
Abstract: PROBLEM TO BE SOLVED: To provide natural rubber latex capable of dispersing excellently a viscosity stabilizer giving excellent stable-viscosity effect, natural rubber containing the viscosity stabilizer and a method for preparing them. SOLUTION: Emulsion of the viscosity stabilizer in a solvent of an aliphatic compound having chain structure is added to natural rubber latex and the natural rubber containing the viscosity stabilizer is prepared by drying this natural rubber latex. Dispersibility of the viscosity stabilizer is improved by emulsifying it, giving the stable-viscosity effect. Hydroxylamine hydrosulfate, semicarbazide, dimedon or a hydrazide compound is used as the viscosity stabilizer.
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公开(公告)号：JP2001354704A
公开(公告)日：2001-12-25
申请号：JP2000180411
申请日：2000-06-15
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , TORATANI HIROTOSHI , KISHIMA KEN , HASHIMOTO TAKATSUGU
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a natural rubber excellent in dispensability of a viscosity stabilizer providing a good viscosity stabilization effect and uniform qualities. SOLUTION: A viscosity stabilizer is added to a crude natural rubber by immersing and/or spraying before drying the rubber. In the manufacture of an RSS-type natural rubber, a viscosity stabilizer is preferably added by immersing and/or spraying in the steps after the coagulation step and before the smoking step. In the manufacture of a TSR-type natural rubber, a viscosity stabilizer is preferably added by immersing and/or spraying before the drying step.
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Patent Agency Ranking
公开(公告)号：JP2002138102A
公开(公告)日：2002-05-14
申请号：JP2000336498
申请日：2000-11-02
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , TORATANI HIROTOSHI , KISHIMA KEN , HASHIMOTO TAKATSUGU
Abstract: PROBLEM TO BE SOLVED: To provide a method of producing a TSR-type natural rubber suppressing fission of natural rubber main chain at the masticating to relatively reduce generation of polymer-gel and maintain molecular weight at high level resulting in excellent break resistance and abrasion resistance of rubber after processing. SOLUTION: This method of producing a TSR-type natural rubber comprises addition of a aging inhibitor at the masticating of natural rubber by a pre- breaker.
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公开(公告)号：JP2002226630A
公开(公告)日：2002-08-14
申请号：JP2001028609
申请日：2001-02-05
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , MAEDA HIROMI , TORATANI HIROTOSHI , KISHIMA KEN
Abstract: PROBLEM TO BE SOLVED: To provide a viscosity adjusting method for a natural rubber at a desired value. SOLUTION: The method is characterized by using more than two sorts of hydrazide compound. For example, in the case of using two sorts of hydrazide compound it is able to adjust a low viscosity natural rubber using a 12C or more alkyl acid hydrazide as a main component and to adjust a high viscosity natural rubber using a hydrazide having hydroxy groups (-OH group) in its molecule, and to adjust a middle viscosity natural rubber using a 2-5C alkyl acid hydrazide as a main component.
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公开(公告)号：JP2003026704A
公开(公告)日：2003-01-29
申请号：JP2001216749
申请日：2001-07-17
Applicant: Bridgestone Corp , 株式会社ブリヂストン
Inventor： TORATANI HIROTOSHI , KISHIMA KEN
Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method of natural rubber excellent in productivity and capable of easily controlling a quality as compared with conventional rubbers of RSS and TSR.
SOLUTION: In the manufacturing method of natural rubber, a drying step is included and dries it at a temperature of 80°C-160°C using a conveyor type drying machine. It is desirable that a step for adding a constant viscosity agent is included until the drying step is complete. The employable constant viscosity agent can include a hydrazide compound represented by the following general formula (I): R-CONHNH
2 (R in the formula (I) represents an alkyl group having the carbon number of 3-30; a cycloalkyl group having the carbon number of 3-30 or an aryl group).
COPYRIGHT: (C)2003,JPOAbstract translation: 要解决的问题：与传统的RSS和TSR的橡胶相比，提供了生产率优异且能够容易地控制质量的天然橡胶的制造方法。 解决方案：在天然橡胶的制造方法中，包括干燥步骤，并使用传送式干燥机将其在80℃-160℃的温度下干燥。 期望添加恒定粘度剂的步骤直到干燥步骤完成为止。 可使用的恒定粘度剂可以包括由以下通式（I）表示的酰肼化合物：R-CONHNH 2（式（I）中的R表示碳数为3-30的烷基;具有碳的环烷基 数3-30或芳基）。
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公开(公告)号：JP2002226504A
公开(公告)日：2002-08-14
申请号：JP2001028610
申请日：2001-02-05
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , MAEDA HIROMI , TORATANI HIROTOSHI , KISHIMA KEN
Abstract: PROBLEM TO BE SOLVED: To provide a method for controlling the vulcanization rate of natural rubber to give a natural rubber having a desired vulcanization rate. SOLUTION: The method for controlling the vulcanization rate of natural rubber comprises the control of the amount of serum of latex in the natural rubber before drying. Preferably, the method contains a step to add a viscosity stabilizing agent and preferably further a step to dry the rubber with a drum drier or a conveyor drier after the addition of the viscosity stabilizing agent.
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公开(公告)号：JP2001354703A
公开(公告)日：2001-12-25
申请号：JP2000180409
申请日：2000-06-15
Applicant: BRIDGESTONE CORP
Inventor： TORATANI HIROTOSHI , KISHIMA KEN , HASHIMOTO TAKATSUGU
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a natural rubber excellent in dispensability of a viscosity stabilizer and providing an excellent viscosity stabilizing effect even when the kneading of the viscosity stabilizer is insuffi cient. SOLUTION: This method for manufacturing a natural rubber comprises the steps of drying a natural rubber and putting a viscosity stabilizer diluted with a solvent onto the dried natural rubber.
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