公开(公告)号：JPH02242835A

公开(公告)日：1990-09-27

申请号：JP6229589

申请日：1989-03-16

Applicant: BRIDGESTONE CORP

Inventor： OTA YASUSHI ,  MAEDA HIROMI

IPC: B60C1/00 ,  B60C5/00 ,  C08K3/04 ,  C08K7/00 ,  C08L9/06 ,  C08L21/00

Abstract: PURPOSE:To obtain the subject tire having markedly improved both of resistance to swelling by oil and appearance by providing specific rubber composition in tread part and side part. CONSTITUTION:The objective tire for road roller is produced by blending (A) 100pts. rubber component composed of solely styrene-butadiene copolymer or mixture of >=60wt.% styrene-butadiene copolymer rubber and other diene-based rubber and containing 25-60wt.% total styrene content in the rubber component with (B) 40-90pts. carbon black having 60-150m /g N-adsorbed surface area (N2SA) and 70-160ml/100g dibutyl phthalate absorbed amount (DBP) and (C) 5-50pts. process oil or softening agent (resin), then providing resultant rubber composition in tread part and side part to afford the objective tire.

公开(公告)号：JP2004262973A

公开(公告)日：2004-09-24

申请号：JP2003034944

申请日：2003-02-13

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

Inventor： MAEDA HIROMI

IPC: B60C1/00 ,  C08C1/04 ,  C08K3/00

CPC classification number: C08C1/04 ,  B60C1/00 ,  C08K3/013 ,  C08L7/00

Abstract: PROBLEM TO BE SOLVED: To provide a natural rubber which improves low heat build-up without damaging the aging resistance of the natural rubber inherently possessed, and to obtain its composition.
SOLUTION: The natural rubber is obtained by partially deprotenizing the proteins in a natural rubber latex by a mechanical separation technique and has a total nitrogen content in the rubber of more than 0.1 mass% to not more than 0.4 mass%. The rubber composition comprises this natural rubber and a filler.
COPYRIGHT: (C)2004,JPO&NCIPI

公开(公告)号：JP2003313366A

公开(公告)日：2003-11-06

申请号：JP2002121111

申请日：2002-04-23

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

Inventor： IWAFUNE SEIICHIRO ,  MAEDA HIROMI

IPC: C12P1/00 ,  C08C1/00 ,  C08K5/25 ,  C08L7/02 ,  C08L9/00

Abstract: PROBLEM TO BE SOLVED: To provide a natural rubber mixture which can exclude or reduce the mastication step, has a low viscosity without increasing the viscosity during storage, and is excellent in resistance to heat aging; a production method therefor; and a rubber composition prepared by using the same.
SOLUTION: This natural rubber mixture is obtained by treating a natural rubber latex with a surfactant and at least one kind of enzyme and adding a hydrazide compound and/or a serum component of a natural rubber to the treated latex. The surfactant is e.g. an anionic or nonionic surfactant. Examples of the enzyme are protease and cellulase.
COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：为了提供可以排除或减少咀嚼步骤的天然橡胶混合物，在不增加保存时的粘度的情况下具有低粘度，并且耐热老化性优异; 一种生产方法; 和使用其制备的橡胶组合物。 解决方案：该天然橡胶混合物通过用表面活性剂和至少一种酶处理天然橡胶胶乳并将酰肼化合物和/或天然橡胶的血清组分加入到经处理的胶乳中而获得。 表面活性剂例如 阴离子或非离子表面活性剂。 酶的实例是蛋白酶和纤维素酶。 版权所有（C）2004，JPO

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

IPC: C08L7/02 ,  C08C1/00 ,  C08K5/25

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.

公开(公告)号：JPH11302542A

公开(公告)日：1999-11-02

申请号：JP11373798

申请日：1998-04-23

Applicant: BRIDGESTONE CORP ,  SHINETSU CHEMICAL CO

Inventor： HASHIMOTO TAKATSUGU ,  MAEDA HIROMI ,  HASEGAWA KOHEI ,  KUWATA SATOSHI

IPC: C08L83/04 ,  C09D183/04

Abstract: PROBLEM TO BE SOLVED: To obtain the subject polishing agent capable of protecting the surface of molded products such as of rubber from ultraviolet light and moisture and the like by including a both terminal hydroxyl group-blocked diorganopolysiloxane, a both terminal trisubstituted siloxy group-blocked diorganopolysiloxane and an organic solvent-soluble silicone resin and others. SOLUTION: This polishing agent is obtained by including (A) 10-70 wt.% of a silicone mixture comprising (i) 1-90 wt.% of a both terminal hydroxyl group-blocked biorganopolysiloxane of formula I (R1 , R and R are each a 1-20C monovalent organic group; (m) and (n) are each 10-2,000) with a viscosity of 0.01-1,000 Pa.s at 25 deg.C, (ii) 5-94 wt.% of a both terminal trisubstituted siloxy group-blocked diorganopolysiloxane of formula II with a viscosity of 0.01-1,000 Pa.s at 25 deg.C and (iii) 5-50 wt.% of an organic solvent-soluble silicone resin containing a total of >=80 mol.% of R 3 SiO1/2 unit and SiO4/2 unit in the molar ratio of 0.5-1.5, (B) 1-10 wt.% of a nonionic surfactant, and (C) water.