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

IPC: C08J3/205 ,  C08C4/00 ,  C08K5/00 ,  C08K5/25 ,  C08L7/00

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.

公开(公告)号：JP2542823B2

公开(公告)日：1996-10-09

申请号：JP12526786

申请日：1986-05-29

Applicant: BRIDGESTONE CORP

Inventor： HASHIMOTO TAKATSUGU ,  TOMITA SEISUKE

IPC: B29C33/56 ,  B29C33/64 ,  B29K21/00 ,  B29L30/00

公开(公告)号：JPH08258511A

公开(公告)日：1996-10-08

申请号：JP6646195

申请日：1995-03-24

Applicant: BRIDGESTONE CORP

Inventor： EOMO SAKAE ,  HASHIMOTO TAKATSUGU ,  NOMURA HIDEAKI ,  SHIMIZU FUMIO

IPC: B60C11/00 ,  B32B5/18 ,  B60C11/11

Abstract: PURPOSE: To provide an inexpensive traveling body with lugs, such as a tire or a crawler which is hardly mudded at work in the damp ground, the soft ground or the muddy ground, and excellent in productivity. CONSTITUTION: A traveling body with lugs, such as an agricultural tire or a crawler is provided with a plurality of lugs 3 arranged on a tread 2 at distances in the circumferential direction, and the front surface of the tread 2 including the lugs 3 is covered by a mudding preventing layer formed of a foamed rubber layer of continuous bubbles, having a thickness of 2 to 10mm, the mean foaming radius of 10 to 1000μm, the ASKAR-C hardness of 2 to 70, and the density of 0.02 to 0.5.

公开(公告)号：JPH0718124A

公开(公告)日：1995-01-20

申请号：JP16561793

申请日：1993-07-05

Applicant: BRIDGESTONE CORP

Inventor： NAKANE SHINSUKE ,  HASHIMOTO TAKATSUGU

IPC: B60C1/00 ,  C08K3/04 ,  C08K5/00 ,  C08K5/01 ,  C08K5/04 ,  C08K5/09 ,  C08L21/00

Abstract: PURPOSE:To obtain a rubber composition for tire composed of a rubber raw material containing a specific diene polymer, an unsaturated fatty acid containing a specific conjugated diene fatty acid, carbon black and a softening agent and having excellent workabillty without deteriorating the breakage characteristics. CONSTITUTION:This composition contains (A) 100 pts.wt. of a rubber raw material containing 5-100 pts.wt. of a diene polymer having a weight-average molecular weight of >=80mu10 and consisting of at least one of conjugated diene polymer and conjugated diene-vinylaromatic hydrocarbon copolymer, (B) 0.1-20 pts.wt. of an unsaturated fatty acid containing >=10wt.% (preferably >=25wt.%) of a conjugated diene fatty acid having at least one set of conjugated double bonds in the molecule, (C) preferably 25-80 pts.wt. of carbon black and (D)

公开(公告)号：JPH06339927A

公开(公告)日：1994-12-13

申请号：JP15264493

申请日：1993-06-01

Applicant: BRIDGESTONE CORP

Inventor： HASHIMOTO TAKATSUGU ,  MISHIMA HISAMI

IPC: B29C33/02 ,  B29C33/58 ,  B29C35/02 ,  B29K21/00 ,  B29L30/00 ,  C08K3/36 ,  C08K5/5475 ,  C08L83/04

Abstract: PURPOSE:To provide a bladder suitable for molding and vulcanization and requiring no release agent and to mold and vulcanize a rubber product using the bladder. CONSTITUTION:A rubber product is molded by using a bladder having at least two release lubricating layers provided to the surface thereof and characterized by that a room temp. curable silicone layer having the adhesiveness with bladder rubber is applied to the innermost layer of the release lubricating layers and a condensation type silicone resin layer is formed to the outermost layer thereof.

公开(公告)号：JPH06192484A

公开(公告)日：1994-07-12

申请号：JP34481292

申请日：1992-12-24

Applicant: BRIDGESTONE CORP

Inventor： YAMAGISHI JUNICHI ,  YAGAWA KAZUO ,  HASHIMOTO TAKATSUGU ,  HACHITANI KAZUO

IPC: C08K3/02 ,  C08K3/00 ,  C08K3/18 ,  C08K3/20 ,  C08L9/02 ,  C08L21/00

Abstract: PURPOSE:To improve the flame retardancy and reduce the emission of smoke without detriment to the mechanical strength by using a rubber component, Al(OH)3, red phosphorus and an acrylonitrile polymer as the constituents. CONSTITUTION:100 pts.wt. rubber component is mixed with Al(OH)3 having a mean particle diameter of at most 0.1mum in an amount of 6-13 pts.wt. so as to provide a weight ratio of Al(OH)3 to the total content of fillers of at most 0.65:1, 1-20 pts.wt. red phosphorus, and an acrylonitrile polymer in an amount sufficient to provide an acrylonitrile group content of 2-25wt.% thus giving a rubber composition having an oxygen index of 19.8 to 27.5.

公开(公告)号：JPH06128420A

公开(公告)日：1994-05-10

申请号：JP30315192

申请日：1992-10-16

Applicant: BRIDGESTONE CORP

Inventor： MATSUDA MITSUYUKI ,  HASHIMOTO TAKATSUGU

IPC: C08K3/04 ,  C08K3/00 ,  C08K3/06 ,  C08K5/00 ,  C08K5/01 ,  C08K5/36 ,  C08L21/00

Abstract: PURPOSE:To reduce viscosity during blending and vulcanization, to improve workability, to save energy and to raise mechanical strength of rubber during vulcanization. CONSTITUTION:A vulcanizable rubber composition comprises 100 pts.wt. rubber, >=55 pts.wt. carbon black, 0-3 pts.wt. softener and 2-4 pts.wt. liquid polymer having 45,000-95,000 viscosity-average molecular weight.

公开(公告)号：JPH05208454A

公开(公告)日：1993-08-20

申请号：JP24983892

申请日：1992-09-18

Applicant: BRIDGESTONE CORP

Inventor： ONIKI TORU ,  YODA NAOHISA ,  HASHIMOTO TAKATSUGU ,  MISHIMA HISAMI

IPC: B29D30/00 ,  B29K27/12 ,  B29K83/00 ,  B60C11/00 ,  C08J7/04

Abstract: PURPOSE:To prevent the driving force of a tire from lowering, mud from adhering to the tire and, especially, the mud from being carried away when a vehicle leaves a paddy field by a method wherein the whole surface of grooves, which partition tread land parts, and the whole surface of the shoulder regions adjacent to the grooves are processed so as to be highly water repellent. CONSTITUTION:Highly water repellent coatings 2 are provided on the whole surface of grooves, which partition tread land parts on a tread T, the whole surface of lugs L, and the whole surface of the shoulder regions Sh adjacent to the lugs, the skid space regions Sk of a case body and side walls S. As the highly water repellent polymer used for the coating 2, silicone resin, fluoroplastic and the like are employed. Or polypropylene or the like can be used as substitute. In short, any material having water repellency, which makes the contact angle with ion-exchanged water measured at 35 deg.C by drop surface profile method at least 80 deg. or more, may well be used.

公开(公告)号：JPH04279614A

公开(公告)日：1992-10-05

申请号：JP35071191

申请日：1991-12-12

Applicant: BRIDGESTONE CORP

Inventor： DEIBITSUDO EMU ROTSUJIMAN ,  YUNGU DABURIYUU KANGU ,  HASHIMOTO TAKATSUGU

IPC: C08F4/44 ,  C08F2/46 ,  C08F4/42 ,  C08F4/46 ,  C08F236/10

Abstract: PURPOSE:To provide a copolymer composition of a 1,3-conjugated diene with an aromatic vinyl compound and having a weight-average mol.wt. of approximately 10000. CONSTITUTION:The continuous production of the copolymer comprises (A) continuously charging a 1,3-conjugated diene, an aromatic vinyl compound, a hydrocarbon solvent and a polymerization catalyst comprising a trimetallized 1-alkine [wherein the catalyst is obtained by reacting an 1-alkine with an organic metal compound and 1,3-conjugated diene] in a reaction tank, (B) continuously stirring the contents in the reaction tank to produce a copolymer, and (C) continuously discharging the produced copolymer from the reaction tank.

公开(公告)号：JPH04252252A

公开(公告)日：1992-09-08

申请号：JP26860991

申请日：1991-09-20

Applicant: BRIDGESTONE CORP

Inventor： JIYANGU DABURIYUU KANGU ,  HASHIMOTO TAKATSUGU

IPC: C08F4/08 ,  C08F4/42 ,  C08F236/10 ,  C08K3/00 ,  C08K3/04 ,  C08K5/00 ,  C08K5/02 ,  C08L9/06 ,  C08L25/10 ,  C08L89/00 ,  C08L91/00

Abstract: PURPOSE:To obtain an ultrahigh-molecular weight elastomer composition excellent in high tensile strength, mechanical strength, abrasion and heat resistance by blending a specific ultrahigh-molecular weight copolymer with specified amounts of carbon black, etc. CONSTITUTION:An ultrahigh-molecular weight elastomer composition is obtained by blending (A) 100 pts. wt. ultrahigh-molecular weight copolymer composition, prepared by polymerizing a 1,3-conjugated diene (e.g. 1,3-butadiene, isoprene or piperylene) with a vinyl aromatic compound (e.g. styrene) in the presence of a trimetalated 1-alkyne catalyst (a product of reaction between a >=4C 1- alkyne with an organometallic compound and the 1,3-conjugated diene) in a hydrocarbon solvent and having >=1000000 weight-average molecular weight with (B) 50-250 pts. wt. carbon black and, as necessary, (C) 0-300 pts. wt. oil.