公开(公告)号：JP2006213752A

公开(公告)日：2006-08-17

申请号：JP2005025163

申请日：2005-02-01

Applicant: Bridgestone Corp ,  株式会社ブリヂストン

Inventor： IWAFUNE SEIICHIRO

IPC: C08L7/00 ,  C08K5/24 ,  C08K5/3492

Abstract: PROBLEM TO BE SOLVED: To provide a rubber composition containing a natural rubber, which hardly causes gelling, retains a stable viscosity and yields a tire rubber etc. wherein the performance on ice is increased and is balanced with its wear resistance, wherein the natural rubber can be easily handled in a tire plant etc.
SOLUTION: The rubber composition contains ≥30 mass% natural rubber obtained by solidifying and drying a natural rubber latex and adding a hydrazine compound or a triazole compound based on the entire mass of the rubber component. The rubber composition serves as an excellent material for a tire tread.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 待解决的问题：提供一种含有几乎不引起胶凝的天然橡胶的橡胶组合物，保持稳定的粘度并产生轮胎橡胶等，其中在冰上的性能增加并与其耐磨性相平衡，其中 天然橡胶可以在轮胎厂等中容易地处理。解决方案：橡胶组合物含有通过固化和干燥天然橡胶胶乳获得的≥30质量％的天然橡胶，并且基于整体加入肼化合物或三唑化合物 橡胶组分的质量。 橡胶组合物用作轮胎胎面的优异材料。 版权所有（C）2006，JPO＆NCIPI

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

IPC: C08J3/20 ,  C08C4/00 ,  C08K5/13 ,  C08K5/18 ,  C08L7/00

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.

公开(公告)号：JP2564760B2

公开(公告)日：1996-12-18

申请号：JP26427693

申请日：1993-09-27

Applicant: BRIDGESTONE CORP

Inventor： IWAFUNE SEIICHIRO ,  IWATA TOSHIRO

IPC: B60C1/00 ,  B60C11/00

公开(公告)号：JPH05331316A

公开(公告)日：1993-12-14

申请号：JP13904992

申请日：1992-05-29

Applicant: BRIDGESTONE CORP

Inventor： MATSUO KENJI ,  IWAFUNE SEIICHIRO ,  SAKIYAMA ATSUSHI ,  OTA TOSHIYUKI

IPC: B60C11/00 ,  B60C1/00 ,  C08K3/00 ,  C08K3/04 ,  C08K3/36 ,  C08K5/00 ,  C08K5/54 ,  C08L9/06 ,  C08L21/00 ,  C08L57/02

Abstract: PURPOSE:To improve wet performance in high-speed driving. CONSTITUTION:The rubber composition comprises 100 pts.wt. rubber at least 70wt.% of which is a styrene/butadiene rubber (SBR) having a combined styrene content of 25-60%, at least 5 pts.wt. silica having a specific surface area determined by nitrogen adsorption (N2SA) of 130-280m /g, and carbon black having an N2SA of 80m /g or larger, the total amount of the silica and the carbon black being 80-180 pts.wt. It gives a vulcanizate having an extractable content determined with acetone/chloroform of 80 pts.wt. or higher.

公开(公告)号：JPH0551488A

公开(公告)日：1993-03-02

申请号：JP23683191

申请日：1991-08-26

Applicant: BRIDGESTONE CORP

Inventor： IWAFUNE SEIICHIRO ,  SATO SUSUMU

IPC: C08L15/00 ,  C08L21/00

Abstract: PURPOSE:To provide a rubber composition containing a specific amount of a specific hydrogenated polyisoprene rubber, having excellent performance on ice and snow, wet-skid performance, abrasion-resistance and processability and suitable as a tread rubber of winter tire or all-season tire. CONSTITUTION:The objective rubber composition having a glass transition point (Tg) of =5wt.% of a hydrogenated polyisoprene rubber having a 3,4-vinyl bond content of >=40wt.% and a hydrogenation ratio of >=25% and kneading other rubber compounding ingredients (e.g. carbon black, stearic acid, zinc oxide, antioxidant, TOP, vulcanization accelerator and sulfur) to the composition. The rubber composition has improved abrasion resistance while keeping high performance on ice and snow, wet-skid performance and processability and is suitable as a tread rubber of winter tire or all-season tire.

公开(公告)号：JPS6463401A

公开(公告)日：1989-03-09

申请号：JP22069787

申请日：1987-09-03

Applicant: BRIDGESTONE CORP

Inventor： IWAFUNE SEIICHIRO ,  YAMAGUCHI KOJIRO ,  TAKIGUCHI EIJI ,  IWATA TOSHIRO

IPC: B29D30/52 ,  B60C11/00 ,  B60C11/01 ,  B60C13/00

Abstract: PURPOSE:To enhance performance under ice and snow and separation resistance in the title tire by arranging on outside of the tread, an outer layer portion formed with a foaming rubber having a specified glass transition point and a predetermined foaming ratio and average bubble diameter in such a way as to have a preset volume rate with respect to the entire volume of the tread. CONSTITUTION:The outer layer portion 3A of a tread 3 is formed with a foaming rubber 11 having volume of 10% or more of the entire tread and including a rubber component with glass transition point of -60 deg.C or less. The foaming rubber 11 includes a closed bubble 13 with a foaming ratio Vs of 5-50% and an average bubble diameter of 5-150mum, and as well it contains 20 or more closed bubbles with a bubble diameter of 30-200mum per a unit area 1mm . An inner layer portion 3B is formed inside the outer layer portion 3A, and thereat, the inner and outer layer portions 3B and 3A are fitted in contact with each other at a first junction A close to a shoulder 4, and as well the inner layer portion 3B and a side wall 8 are covered with a reinforcing layer 10 at a second junction B. This constitution enables performance under ice and snow and separation resistance to be enhanced.

公开(公告)号：JP2004210590A

公开(公告)日：2004-07-29

申请号：JP2002382049

申请日：2002-12-27

Applicant: Bridgestone Corp ,  Otsuka Chemical Holdings Co Ltd ,  大塚化学ホールディングス株式会社 ,  株式会社ブリヂストン

Inventor： IWAFUNE SEIICHIRO ,  MIYAURA AKIFUMI ,  USUI MAKIO

IPC: C05G1/00

Abstract: PROBLEM TO BE SOLVED: To provide a fertilizer composition prompting the normal growth of plant and having excellent total balance, particularly suitable for the culture of a natural rubber tree and a method of cultivation of the natural rubber tree.
SOLUTION: The fertilizer composition contains 5 elements of nitrogen, phosphorus, potassium, calcium and magnesium and the content of calcium expressed in terms of oxide assuming the content of nitrogen element to be 100 is ≤50. The fertilizer composition is preferably a fertilizer composition for the natural rubber tree. The method of cultivation of the natural rubber tree uses the fertilizer composition.
COPYRIGHT: (C)2004,JPO&NCIPI

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

IPC: C08K5/25 ,  C08C1/00 ,  C08L7/02

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.

公开(公告)号：JPH09208748A

公开(公告)日：1997-08-12

申请号：JP1998096

申请日：1996-02-06

Applicant: BRIDGESTONE CORP

Inventor： OTA TOSHIYUKI ,  MATSUO KENJI ,  SAKIYAMA ATSUSHI ,  IWAFUNE SEIICHIRO

IPC: C08K3/04 ,  C08K3/00 ,  C08K3/36 ,  C08L9/06 ,  C08L21/00

Abstract: PROBLEM TO BE SOLVED: To improve the gripping power of a tire on a wet road and semi-wet road in low-temperature range and especially high-temperature range without deteriorating the abrasion resistance of the tire. SOLUTION: The rubber composition contains 100 pts.wt. of a rubber component containing >=70 pts.wt. of an SBR having a styrene content of 20-60%, 5-150 pts.wt. of silica having a nitrogen-adsorption specific surface area of 130-280m /g, 5-170 pts.wt. of carbon black having a nitrogen-adsorption specific surface area of 80-280m /g (the sum of the silica and the carbon black is 70-180 pts.wt.) and 3-50 pts.wt. of a 9C aromatic petroleum resin and/or an alkylphenol resin. The rubber composition contains 30-270 pts.wt. of an acetone-chloroform extractable component after vulcanization.

公开(公告)号：JPH04368205A

公开(公告)日：1992-12-21

申请号：JP17198091

申请日：1991-06-18

Applicant: BRIDGESTONE CORP

Inventor： MORIMOTO YOSHIYUKI ,  IWAFUNE SEIICHIRO

IPC: B29D30/06 ,  B29K19/00 ,  B29K105/04 ,  B60C1/00 ,  B60C11/00 ,  C08F8/00 ,  C08F10/02 ,  C08L21/00 ,  C08L23/04 ,  C08L65/00

Abstract: PURPOSE:To improve the drivability, braking ability and maneuverability on an icy and snowy road without degrading the abrasion resistance of a pneumatic tire. CONSTITUTION:Foam rubber which has 3-100 pts.wt. of super macromolecule polyethlene whose molecule amount is more than 500,000 to rubber content 100 pts.wt. average grain diameter is 1-500mum, and separate bubble with 3-35% foaming rate is provided at a tread.