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    COMPOSITION FOR TIRE SIDEWALL
    64.
    发明专利
    COMPOSITION FOR TIRE SIDEWALL 失效

    公开(公告)号：JPH05320421A

    公开(公告)日：1993-12-03

    申请号：JP13054092

    申请日：1992-05-22

    Applicant: BRIDGESTONE CORP

    Inventor： KONDO HAJIME ,  SHIBATA TADASHI ,  KITAMURA TAKASHI ,  FUJIO RYOTA ,  HAMADA TAKATSUGU

    IPC: B60C1/00 ,  B60C13/00 ,  C08K3/04 ,  C08L9/00 ,  C08L21/00

    Abstract: PURPOSE:To improve carbon dispersibility during kneading, wear resistance, breaking strength, and loss characteristics by mixing a specific polybutadiene with other rubber and carbon black. CONSTITUTION:Butadiene is polymerized in the presence of a lithium compound initiator at -20 to 150 deg.C to obtain polybutadiene having a mol.wt. distribution, Mw/Mu, of 2.0 or lower. The polymer is modified by adding a tin compound thereto to obtain a polybutadiene rubber (A) which has a vinyl bond content of 10-50% and in which the content of C-bonded Sn is 50-3,000ppm. 100 pts.wt. rubber consisting of 20-100wt.% the ingredient (A) and 80-0wt.% other rubber ingredient is mixed with 10-60 pts.wt. carbon black having particle diameters of 80mum or smaller to thereby obtain the objective composition having a Mooney viscosity, ML1+4(130 deg.C), of 20-70.

    CONJUGATED DIENE-BASED RUBBER COMPOSITION
    65.
    发明专利
    CONJUGATED DIENE-BASED RUBBER COMPOSITION 失效

    公开(公告)号：JPH05186639A

    公开(公告)日：1993-07-27

    申请号：JP18935692

    申请日：1992-07-16

    Applicant: BRIDGESTONE CORP

    Inventor： SHIMIZU TAKASHI ,  KITAMURA TAKASHI ,  FUJIO RYOTA

    IPC: C08F4/48 ,  C08F4/00 ,  C08F4/42 ,  C08F8/00 ,  C08F236/06 ,  C08K3/04 ,  C08L9/06 ,  C08L21/00

    Abstract: PURPOSE:To obtain the subject composition, composed of a specific styrene- butadiene copolymer rubber, specified carbon black and a specific diene-based rubber in a specified proportion, excellent in low heat build-up properties, breaking strength and abrasion resistance and suitable as tire treads, etc. CONSTITUTION:The objective composition is obtained by blending (A) 100 pts.wt diene-based rubber prepared by copolymerizing 1,3-butadiene with styrene at a wt.% ratio within the range of (80/10) to (50/50) using one or more alkali metallic compounds selected from the group consisting of alkali metallic compound expressed by the formulas R M, R OM, R COOM and R R NM [R to R are alkyl, cycloalkyl, etc. ; M is Na, K, Rb or Cs] in an amount of 0.01-0.3 mol based on 1 gram equiv. lithium in an organolithium compound as an initiator in a hydrocarbon solvent, further modifying the polymerization active terminals with a modifying agent and blending >=30 pts.wt. prepared rubber therein with (B) 30-80 pts.wt. carbon black having >=70m /g nitrogen adsorption specific surface area and 70-150ml/100g DBP oil absorption.

    RUBBER COMPOSITION CONTAINING DIENE BLOCK POLYMER
    66.
    发明专利
    RUBBER COMPOSITION CONTAINING DIENE BLOCK POLYMER 失效

    公开(公告)号：JPH04154821A

    公开(公告)日：1992-05-27

    申请号：JP27893190

    申请日：1990-10-19

    Applicant: BRIDGESTONE CORP

    Inventor： HORIKAWA YASUO ,  KITAMURA TAKASHI

    IPC: C08F297/04 ,  C08F8/30 ,  C08F8/42

    Abstract: PURPOSE:To provide the title composition low in the resilience of the cured products thereof, excellent in the breaking strength, fuel economy and wear resistance of said cured products, thus suitable as a tire tread rubber, containing a specific diene block copolymer. CONSTITUTION:Firstly, to one end of a straight chain polymer produced by polymerizing a conjugated diene compound (pref. butadiene) or its mixture with an aromatic vinyl compound (pref. styrene), is bound a polymer with the glass transition point higher than that of said straight chain polymer by >=80 deg.C (e.g. styrene polymer), and also the other end is modified with a modifier (pref. tin tetrachloride), thus synthesizing a diene block polymer. Then, this block polymer is blended so as to account for >=30wt.% of the whole rubber component, thus obtaining the objective composition.

    ELECTRO VISCOUS FLUID
    67.
    发明专利
    ELECTRO VISCOUS FLUID 失效

    公开(公告)号：JPH03247698A

    公开(公告)日：1991-11-05

    申请号：JP4436690

    申请日：1990-02-27

    Applicant: BRIDGESTONE CORP

    Inventor： ISHINO YUICHI ,  KITAMURA TAKASHI ,  ENDO SHIGEKI ,  FUJIO RYOTA ,  SAITO TASUKU

    IPC: B01J13/00 ,  C10M161/00 ,  C10N20/06 ,  C10N40/14 ,  H01B3/20

    Abstract: PURPOSE:To provide a non-aqueous electro viscous fluid having excellent heat and cold resistance and high electro viscous effect and requiring only a low consumption electric power by dispersing specific carbonaceous fine particles in an electrically insulating oil, the surfaces of the carbonaceous fine powder being covered with the thin film layers of a high molecular polymer. CONSTITUTION:The objective electro viscous fluid is prepared by dispersing fine particles in an electrically insulating oil, the fine particles being prepared by covering the surfaces of carbonaceous fine particles having aC/H ratio of 2.4-3.0 with the thin film layers of a polymer such as poly methyl methacrylate, PS, PVAc, PVC, poly vinylidene fluoride, epoxy resin, phenolic resin or silicone polymer. The carbonaceous fine particles are preferably those prepared by separating from a pitch component optically isotropic small spheres produced by the thermal treatment of coal tar.

    TETRAZOLE-MODIFIED ELASTOMER, PREPARATION THEREOF AND RUBBER COMPOSITION USING THE SAME
    68.
    发明专利
    TETRAZOLE-MODIFIED ELASTOMER, PREPARATION THEREOF AND RUBBER COMPOSITION USING THE SAME 失效

    公开(公告)号：JPH03103402A

    公开(公告)日：1991-04-30

    申请号：JP24061489

    申请日：1989-09-19

    Applicant: BRIDGESTONE CORP

    Inventor： OSHIMA NOBUMITSU ,  MORITA KOICHI ,  KITAMURA TAKASHI ,  TAKIZAWA TOSHIKI ,  FUJIO RYOTA

    IPC: C07D257/04 ,  C08C19/22 ,  C08F8/34

    Abstract: PURPOSE:To prepare the subject novel elastomer having excellent breaking strength and road surface-gripping property and suitable for tread rubbers by reacting a C=C band-containing elastomer with a substituted tetrazole mercaptan in the presence of a specific organic halogenation agent. CONSTITUTION:An elastomer having carbon-carbon double bonds (e.g. styrene- butadiene copolymer rubber) is reacted with a substituted tetrazole mercaptan of formula II (R is 1-20C alkyl, aryl, etc.) (e.g. 1-methyl-5-mercapto-1,2,3-tetrazole) in the presence of an organic halogenation agent selected from among an alkyl hypohalite, an N-haloamide compound of formula I (X is halogen; A is carboxylic acid residue, sulfonic acid residue, etc.; B is H, halogen, etc.) and a trihalocyanuric acid to provide the objective elastomer in which substituted tetrazolylthio groups of formula III are irregularily addition-reacted to one part of the double bonds of the elastomer in a ratio of are substituted tetrazolylthio group per double bond.

    ELECTROLYTE FOR LITHIUM BATTERY
    69.
    发明专利
    ELECTROLYTE FOR LITHIUM BATTERY 失效

    公开(公告)号：JPH02265171A

    公开(公告)日：1990-10-29

    申请号：JP8719589

    申请日：1989-04-05

    Applicant: BRIDGESTONE CORP

    Inventor： KITAMURA TAKASHI ,  OFUKU EIJI ,  KAWAGOE TAKAHIRO

    IPC: H01M10/26

    Abstract: PURPOSE:To obtain a lithium secondary battery having high energy density and long cycle life by using a mixture of LiPF6 and at least one of other lithium salts as the lithium salt and a mixed solvent containing propylene carbonate and ethylene carbonate as the organic solvent of a lithium battery. CONSTITUTION:As a lithium salt, a mixture of LiPF6 and at least one of other lithium salts is used. As an organic solvent, a mixed solvent containing propylene carbonate and ethylene carbonate is used. As other lithium salts mixed with LiPF6, LiClO4 LiBF4, LiAlCl4, and CF3CO2Li are used. If a metal oxide is used as the positive, active material, use of LiClO4 is preferable. If a conductive polymer is used as the positive active material, use of LiBF4 is preferable. A lithium secondary battery having high energy density and long cycle life can be obtained.

    ELECTROPHOTOGRAPHIC SENSITIVE BODY
    70.
    发明专利
    ELECTROPHOTOGRAPHIC SENSITIVE BODY 失效

    公开(公告)号：JPH01200360A

    公开(公告)日：1989-08-11

    申请号：JP2538988

    申请日：1988-02-05

    Applicant: BRIDGESTONE CORP

    Inventor： KITAMURA TAKASHI ,  YOKOYAMA MASAAKI

    IPC: G03G5/06

    Abstract: PURPOSE:To obtain a sensitive body favorably utilized even for a laser printer by incorporating a specified naphthylamine compd. into an electric charge transferring layer. CONSTITUTION:When an electric charge generating layer and an electric charge transferring layer are formed on an electrically conductive support to obtain a laminate type electrophotographic sensitive body, a naphthylamine compd. represented by formula I (where each of R and R is H or alkyl) is incorporated into the electric charge transferring layer. In case of a semiconductor laser light source, a phthalocyanine pigment is preferably incorporated into the elec tric charge generating layer. The resulting sensitive body has high sensitivity to white light and the electric charge generating layer is well compatible with the electric charge transferring layer even in the case where the generating layer contains the phthalocyanine pigment having absorption at the wavelength of semiconductor laser light. The sensitivity body exhibits superior char acteristics and can be favorably used as a sensitive body for a semiconductor laser printer.

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