公开(公告)号：JPH04103646A

公开(公告)日：1992-04-06

申请号：JP21893190

申请日：1990-08-22

Applicant: BRIDGESTONE CORP

Inventor： IKEDA NOBUTADA ,  TAJIMA MASANORI

IPC: C08L9/00 ,  C08L21/00

Abstract: PURPOSE:To obtain a rubber composition capable of effectively preventing ozone deterioration in high-temperature area and having excellent appearance by blending a diene based rubber with a specific petroleum paraffin at a prescribed ratio. CONSTITUTION:The objective rubber composition obtained by blending (A) 100 pts.wt. diene-based rubber with (B) 1-10 pts.wt. paraffin wax containing 3-5wt.% 34-44C straight-chain saturated hydrocarbon, >=2wt.% 22-33C straight- chain saturated hydrocarbon and 34-44C straight-chain saturated hydrocarbon of arithmetic mean weight content 0.5% higher than that of 22-33C straight-chain saturated hydrocarbon.

公开(公告)号：JPH04103645A

公开(公告)日：1992-04-06

申请号：JP21893090

申请日：1990-08-22

Applicant: BRIDGESTONE CORP

Inventor： IKEDA NOBUTADA ,  TAJIMA MASANORI

IPC: C08L9/00 ,  C08L21/00

Abstract: PURPOSE:To obtain a rubber composition capable of effectively preventing ozone deterioration in low-temperature area and having excellent appearance by blending a diene-based rubber with a specific petroleum paraffin at a pre scribed ratio. CONSTITUTION:The objective rubber composition obtained by blending (A) 100 pts.wt. diene-based rubber with (B) 1-10 pts.wt. paraffin wax containing 3-8wt.% 23-30C, straight-chain saturated hydrocarbon, >=2wt.% 31-44C straight- chain saturated hydrocarbon and 23-30C straight-chain saturated hydrocarbon of arithmetic mean weight content 1% higher than that of 31-44C straight-chain saturated hydrocarbon.

公开(公告)号：JPH0971759A

公开(公告)日：1997-03-18

申请号：JP22998895

申请日：1995-09-07

Applicant: BRIDGESTONE CORP

Inventor： TAJIMA MASANORI

IPC: B60C1/00 ,  C09J109/00 ,  C09J121/00

Abstract: PROBLEM TO BE SOLVED: To obtain an adhesive composition for tire repairing which is excellent in vulcanization acceleration, bonding, strength, etc., by incorporating a specific vulcanization accelerator and a halogen-free nonmagnetic hydrocarbon solvent into a diene rubber in respective given amounts. SOLUTION: A diene rubber (A) in an amount of 100 pts.wt. is compounded with 5-500 pts.wt. at least one vulcanization accelerator (B) represented by formula I, II, III, IV, V, VI, or VII (wherein R and R each is a 5C or higher alkyl, a cycloalkyl, or an aryl substituted by a 1C or higher alkyl, or R and R are bonded to each other to form a heterocycle structure in cooperation with the nitrogen atom; M is a metal; (n) is the valence of the metal: (m) is 1-10; and R is a 5C or higher alkyl, a cycloalkyl, or an aryl substituted by a 1C or higher alkyl) and 500-5,000 pts.wt. nonmagnetic hydrocarbon solvent (C) containing no halogen atoms in the molecule to obtain the objective composition. Examples of the ingredient (C) include n-hexane, cyclohexane, and benzene.

公开(公告)号：JPH0726068A

公开(公告)日：1995-01-27

申请号：JP16781193

申请日：1993-07-07

Applicant: BRIDGESTONE CORP

Inventor： TAJIMA MASANORI

IPC: B60C1/00 ,  B29C73/16 ,  B60C19/00 ,  C08K5/04 ,  C08K5/09 ,  C08L21/00

Abstract: PURPOSE:To obtain a rubber composition for repairing a pneumatic tire which can be sufficiently filled in the external damage of a rubber tire even when the damage is narrow and deep, does not scorch in an injection gun, and can form a repaired part of good durability by mixing a rubber component with a specified organic unsaturated fatty acid. CONSTITUTION:The rubber composition comprises 100 pts.wt. at least one rubber component selected from natural and synthetic diene rubbers and 0.5-20 pts.wt. organic unsaturated fatty acid having at least two C-C double bonds in the molecule and containing at least 10wt.% conjugated dienoic acid having a pair of conjugated C-C double bonds in the molecule. This composition may further contain carbon black, silica, process oil, antioxidant, vulcanization accelerator, zinc white, sulfur, etc. The process oil is used in an amount of desirably 10wt.% or below. When it is added in an amount of above 10 pts.wt.%, the modulus of elasticity is lowered.

公开(公告)号：JPH04176714A

公开(公告)日：1992-06-24

申请号：JP30686390

申请日：1990-11-13

Applicant: BRIDGESTONE CORP

Inventor： TAJIMA MASANORI

IPC: B60C15/05 ,  B60C15/00 ,  B60C15/06

Abstract: PURPOSE:To improve the thermal aging resistance and weatherability of a bead part by forming a covering rubber layer arranged on the inside in the radial direction of a bead part by attaching an unvulcanized rubber sheet containing a vulcanization super-accelerating agent in a vulcanized bead part and then carrying out vulcanization. CONSTITUTION:Each unvulcanized rubber sheet is attached on both the inner side 3a and the back surface 3b side in the radial direction of a vulcanized bead part 3, and only the unvulcanized rubber sheet is partially vulcanized to form a covering rubber layer 13, and vulcanization attached on the inner surface 3a and back surface 3b in the radial direction of the bead part 3. The unvulcanized rubber sheet is allowed to contain the vulcanization superaccelerating agent such as dithiocarbamic acid salt, and vulcanization can be completed in a short time. Accordingly, the transition of sulfur and antioxidation improvement agent during the vulcanization of the unvulcanized rubber sheet can be suppressed.

公开(公告)号：JPH04201326A

公开(公告)日：1992-07-22

申请号：JP33365090

申请日：1990-11-30

Applicant: BRIDGESTONE CORP

Inventor： TAJIMA MASANORI

IPC: B29D30/08 ,  B29K21/00 ,  B29K105/24

Abstract: PURPOSE:To effectively suppress the generation of the rubbing or cracking of a rim by bonding an unvulcanized rubber sheet to at least the inside of the bead part of a vulcanized tire in the radius direction thereof and vulcanizing the unvulcanized rubber sheet to bond the same to the bead part of the vulcanized tire. CONSTITUTION:At the time of vulcanization, by vulcanizing a bead part 3 using a slightly large bladder ring, the inner diameter of the bead part 3 is made slightly larger than a set radius and the axial distance between rears 3b is made slightly small. Next, at least to the inside of the bead part 3 of the tire 1 thus vulcanized in the radius direction thereof, in this example, to the inside and rear of the bead 3 of the tire in the radius direction thereof, an unvulcanized rubber sheet S with thickness (t), concretely, with thickness of about 0.5-2.0mm is bonded. Thereafter, only the unvulcanized rubber sheet S is partially vulcanized to bond the unvulcanized rubber sheet S to the inner surface 3a and rear 3b of the bead part 3 of the vulcanized tire 1 in the radius direction thereof.

公开(公告)号：JPH04108007A

公开(公告)日：1992-04-09

申请号：JP22235890

申请日：1990-08-27

Applicant: BRIDGESTONE CORP

Inventor： IKEDA NOBUTADA ,  TAJIMA MASANORI

IPC: B60C13/00 ,  B29D30/72 ,  B29K21/00 ,  B32B25/14 ,  C08L9/00 ,  C08L21/00 ,  C08L91/08

Abstract: PURPOSE:To improve ozone-proof ability without spoiling its external appearance by mixing wax having a high proportion of non normal paraffin into the inner layer of a sidewall, and also mixing wax having a high proportion of normal paraffin into the outer layer. CONSTITUTION:In a pneumatic tire, a sidewall for covering and protecting a carcass 5 has a two layered sidewall structure consisting of the inner layer 2b adjacent to the carcass 5 and the outer layer 2a arranged outside of it. In the above-mentioned constitution, against 100 weight part of rubber component consisting of diene-related rubber, a rubber constituent (A) obtained by mixing 1-6 weight part of oil paraffin wax, in which straight chain hydrocarbon content exceeds 80 weight %, is arranged as the above-mentioned outer layer 2a. Furthermore, against 100 weight part of the rubber component consisting of the diene-related rubber, a rubber constituent (B) obtained by mixing 2-10 weight part of the oil paraffin wax, in which non straight chain hydrocarbon content exceeds 20 weight %, is arranged as the above-mentioned inner layer. Thereby, excellent ozone-proof ability can be fully displayed, and also a fine appearance of the sidewall can be maintained.

公开(公告)号：JPH03106946A

公开(公告)日：1991-05-07

申请号：JP24330089

申请日：1989-09-21

Applicant: BRIDGESTONE CORP

Inventor： TAJIMA MASANORI ,  HIRATA YASUSHI

IPC: B60C11/00 ,  B29D30/52 ,  C08J9/10 ,  C08K5/41 ,  C08K5/42 ,  C08K5/45 ,  C08K5/47 ,  C08L9/00 ,  C08L21/00

Abstract: PURPOSE:To obtain an improved foamable rubber composition which has a stable degree of expansion and can give stable properties by mixing a diene rubber with a combination of a specified blowing agent with a vulcanization accelerator. CONSTITUTION:A foamable rubber composition suitable for the formation of closed cells is obtained by mixing a rubber component comprising at least one diene rubber with a combination of p,p'-oxybis(benzenesulfonylhydrazide) as a blowing agent with N,N-dicyclohexyl-2-benzothiazolylsulfenamide as a vulcanization accelerator. This composition has a degree of expansion, expansion initiation time and a scorch time stabilized against variations in production steps such as an extrusion temperature, an environment of standing of unvulcanized rubber and a standing time and can give stable properties. A pneumatic tire whose tread is made from this composition can be remarkably improved in the degree of expansion of a product without detriment to the productivity, so that the quality can be stabilized.

公开(公告)号：JP2006328135A

公开(公告)日：2006-12-07

申请号：JP2005150657

申请日：2005-05-24

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

Inventor： TAJIMA MASANORI

IPC: C08J3/22 ,  C08L7/02

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a natural rubber carbon master batch useful for natural rubber compositions suppressed in reduction of the average molecular weight of the natural rubber and improved in reinforcement, abrasion resistance, adhesiveness to steel cords and the like, and the natural rubber carbon master batch produced therefrom.
SOLUTION: The method for producing the natural rubber carbon master batch comprises a process for mixing the natural rubber with a carbon black slurry in a liquid phase and a coagulation process. In the method, the pH of the liquid phase in the coagulation process is 8-10 and the natural rubber in the coagulated product has ≥8.0×10
5 weight average molecular weight.
COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 解决的问题：提供一种天然橡胶碳母料的制造方法，其可用于天然橡胶组合物，其抑制天然橡胶的平均分子量的降低，并且增强了增强，耐磨性，对钢丝绳的粘附性， 和从其生产的天然橡胶碳母料。 解决方案：天然橡胶碳母料的制备方法包括将天然橡胶与液相中的炭黑浆料和凝结过程混合的方法。 在该方法中，凝固过程中液相的pH为8-10，凝结产物中的天然橡胶的重均分子量≥8.0×10 5。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JPH04108008A

公开(公告)日：1992-04-09

申请号：JP22235990

申请日：1990-08-27

Applicant: BRIDGESTONE CORP

Inventor： IKEDA NOBUTADA ,  TAJIMA MASANORI

IPC: B60C13/00 ,  B29D30/72 ,  B29K21/00 ,  B32B25/14 ,  C08L9/00 ,  C08L21/00 ,  C08L91/08

Abstract: PURPOSE:To improve ozone-proof ability without spoiling its external appearance by arranging a rubber constituent, in which a mixing volume of paraffin wax is increased in order of the outermost layer, the middle layer and the inner most layer, as a sidewall for covering a carcass. CONSTITUTION:A sidewall for covering a carcass 5 of a pneumatic tire is constituted in a three layered structure consisting of the innermost layer 2c adjacent to the carcass 5, the middle layer 2b arranged outside of it and the outermost layer 2a arranged outside further of it. A rubber constituent, in which a mixing volume of paraffin wax is increased in order of the outermost layer 2a, the middle layer 2b and the innermost layer 2c, is arranged as the sidewall. Furthermore, the rubber constituent of the outermost layer 2a is obtained by mixing less than 3 weight part of the paraffin wax against 100 weight part of rubber component, and also the ratios of the mixing volumes (unit weight part) of the paraffin wax into the outermost layer 2a, the middle layer 2b and the innermost layer 2c are set in such a way that the outermost layer 2a is below 0.8 and the innermost layer 2c is 1.2-3.0, assuming that the ratio of the middle layer 2b is set as 1.