公开(公告)号：JPH08238629A

公开(公告)日：1996-09-17

申请号：JP4294595

申请日：1995-03-02

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO

IPC: B29C33/10 ,  B29C33/38 ,  B29C33/56 ,  B29K21/00 ,  B29K101/00 ,  B29K105/24 ,  B29L30/00 ,  C08L27/18 ,  C08L27/20 ,  C23C4/08 ,  C23C4/10

Abstract: PURPOSE: To sufficiently suppress the contamination of the surface of a mold cavity coming into contact with a rubber or plastic molding material caused by repeated molding and to make it possible to enhance the durability of the surface of the mold cavity in the production of a rubber or plastic molded product and to provide a mold capable of producing the good rubber or plastic molded product free from spew. CONSTITUTION: In a method for producing a rubber or plastic molded product by supplying a rubber or plastic molding material into a mold, the mold wherein a metal or ceramic flame spraying treatment layer is formed as the substrate layer 21 of a mold cavity and a fluoroplastic layer 20 is formed to the surface of the mold cavity is used and the rubber or plastic molding material is supplied into the cavity of the mold to produce a molded product.

公开(公告)号：JPH079457A

公开(公告)日：1995-01-13

申请号：JP15960293

申请日：1993-06-29

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO ,  YOKOYAMA TOMOYASU ,  HIRUKAWA TETSUYA

IPC: B29C33/02 ,  B29C35/02 ,  B29K21/00 ,  B29K105/24 ,  B29L30/00

Abstract: PURPOSE:To vulcanize a tire under the optimum conditions not generating non-vulcanization or over-vulcanization at the time of the vulcanization treatment of the tire. CONSTITUTION:The vulcanization of a tire 48 to be vulcanized is started (steps 102-106) on the basis of the initialized conditions of the tire 48 to be vulcanized. Next, the temps. corresponding to the respective parts of the tire are measured (steps 108-112) and the most delay point is determined (steps 114, 116) from the temp. estimated by FEM analysis and the vulcanization degree of the most delay point and the vulcanization reactivity at every constitutional material are calculated (step 117) on the basis of the estimated temp. and the vulcanization time before the vulcanization reactivity reaches a predetermined value is estimated (step 118). The estimated vulcanization time is compared with a preset vulcanization time and a vulcanizer is subjected to feedback control (steps 120, 122) until reaching the estimated vulcanization time. The vulcanizer is stopped (step 124) when the tire is judged to be vulcanized in the optimum state at the point of time when the estimated vulcanization time is elapsed.

公开(公告)号：JPH01292232A

公开(公告)日：1989-11-24

申请号：JP12350888

申请日：1988-05-20

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO ,  YANO MASASHI ,  ITO KENJI ,  ONO SHIGEKI ,  KOMORI HIROYUKI

IPC: G01N3/56 ,  G01N19/02

Abstract: PURPOSE:To impart an arbitrary slip ratio and slip angle to a sample, by rotating a cylindrical grinding body by a drive motor and driving a sample shaft for holding an elastic sample by a sample driving means and a sample revolving means. CONSTITUTION:A cylindrical grinding body 3 is rotated by a drive motor 2 and a sample shaft for holding an elastic sample is driven by a sample driving means 8 and a sample revolving means 16. The grinding body 3 and the elastic sample are respectively and independently revolved and driven to impart a slip ratio to the elastic sample while the elastic sample is revolved around a vertical load line 15 by the sample revolving means 16 to impart a slip angle on the grinding surface of the grinding body 3. By this method, the sample shaft 6 and the grinding shaft of the grinding body 3 can be respectively and independently driven with the predetermined number of rotations.

公开(公告)号：JPH01168739A

公开(公告)日：1989-07-04

申请号：JP32889687

申请日：1987-12-25

Applicant: BRIDGESTONE CORP

Inventor： YAMAMOTO HISAO ,  ITO MICHIO ,  WATANABE YOICHI ,  ISEDA YUTAKA ,  KINOSHITA TAKESHI

IPC: C08K5/13 ,  C08K5/00 ,  C08K5/34 ,  C08K5/56 ,  C08L7/00 ,  C08L9/00

Abstract: PURPOSE:To obtain a rubber composition which can give a tire simultaneously improved in both durability and productivity, by adding a phenoxy cobalt salt and a bismaleimide compound to a natural rubber or a synthetic polyisoprene rubber. CONSTITUTION:This rubber composition is prepared by adding 0.01-1 pt.wt. (in terms of a cobalt element content) phenoxy cobalt salt of formula I or II and 0.2-10 pts.wt. bismaleimide compound of formula III to 100 pts.wt. rubber component containing at least 70 pts.wt. natural rubber and/or synthetic rubber. In the formulas, R1-R11 are each H, a hydroxyl group, a 1-18 C alkyl, a 5-12C cycloalkyl, a 1-16C alkylthio group, a 6-14C aryl, a sulfur atom, a dithio group, O, a 1-4C alkyl-N group or the like, and Z is a 2-10C hydrocarbon group. Said rubbers which constitute the rubber composition are sulfur- vulcanizable rubbers, and among them, a natural rubber, a polyisoprene rubber, a polybutadiene rubber, a styrene/butadiene copolymer rubber or a blend thereof is particularly desirable because of their wide versatility.

公开(公告)号：JPS61272141A

公开(公告)日：1986-12-02

申请号：JP11364885

申请日：1985-05-27

Applicant: BRIDGESTONE CORP

Inventor： SAITO TADASHI ,  ITO MICHIO ,  MASUNAGA MIKIO

IPC: B32B25/04

公开(公告)号：JP2001130909A

公开(公告)日：2001-05-15

申请号：JP30918599

申请日：1999-10-29

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO ,  ENDO SHIGEKI

IPC: C01B31/36

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing silicon carbide powder, by which the highly pure silicon carbide powder can simply be obtained. SOLUTION: This method for producing silicon carbide powder, containing a thermal treatment process for thermally treating silicon carbide powder under a vacuum atmosphere.

公开(公告)号：JPH0780843A

公开(公告)日：1995-03-28

申请号：JP22710793

申请日：1993-09-13

Applicant: BRIDGESTONE CORP

Inventor： IWATA TOSHIRO ,  ITO MICHIO ,  HIRUKAWA TETSUYA

IPC: B29C33/02 ,  B29C35/02 ,  B29K21/00 ,  B29K105/24

Abstract: PURPOSE:To carry out the vulcanization without causing irregularity in a vulcanization state and enhanced the productivity or quality by estimating the energy at the time of next vulcanization so that the fluctuation tendency of energy calculated between a plurality of materials to be vulcanized enters into a specific range and controlling next vulcanization on the basis of this estimation. CONSTITUTION:In vulcanization treatment, the update data at the time of initial vulcanization stored in an external memory device as a data base is read, for example, five times and a vulcanization state value is estimated from the read data to judge whether the vulcanization state value is within a specific tolerance range. When the estimated value is within the tolerance range, a tire is vulcanized as it is and, when the value is out of the torelance range, the energy for vulcanizing the tire 48 is determined while the vulcanization state value is held within the torelance range. That is, the energy allowing all of the values of a vulcanization time, a vulcanization degree and the max. temp. to enter the torelance range is operated to determine the energy at the time of the next vulcanization of the tire. The temp. of the heating fluid supplied to a jacket 16 and upper and lower platens 22, 24 is altered by the determined energy to be reflected to the next tire 48.

公开(公告)号：JPH0740355A

公开(公告)日：1995-02-10

申请号：JP18421793

申请日：1993-07-26

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO ,  IWATA TOSHIRO ,  HIRUKAWA TETSUYA

IPC: B29C33/04 ,  B29C35/04 ,  B29K21/00 ,  B29K105/24 ,  B29L30/00

Abstract: PURPOSE:To vulcanize a material to be vulcanized, such as a tire, into an optimum state without the variation of the vulcanized state of the material, such as a tire, in the vulcanized state. CONSTITUTION:Based on initial set conditions including a boundary condition of a tire 48 to be treated, a vulcanization and a time series temperature measurement are conducted (steps 102-112). In the initial set conditions, a thermal conductivity, a heat transfer coefficient, a heat flow rate, and the like as a function of a temperature are taken into consideration. An internal temperature of the tire is estimated using the measured temperature values by an FEN analysis by an analyzing model composed of the tire, a mold, and a bladder, and a latest point is determined by the estimated temperature (steps 114, 116). Next, a vulcanizing degree and a vulcanizing reactivity at the latest point are evaluated (a step 117). A vulcanizing time to a predetermined vulcanizing reactivity value is predicted (a step 118). A vulcanizing machine is feedback controlled till the elapse of the predicted vulcanizing time (steps 120-124).

公开(公告)号：JPH01118547A

公开(公告)日：1989-05-11

申请号：JP27583287

申请日：1987-11-02

Applicant: BRIDGESTONE CORP

Inventor： YAMAMOTO HISAO ,  ITO MICHIO ,  WATANABE YOICHI ,  ISEDA YUTAKA

IPC: C08K5/34 ,  C08K5/00 ,  C08K5/04 ,  C08K5/07 ,  C08K5/3415 ,  C08K5/3417 ,  C08K5/56 ,  C08L7/00 ,  C08L9/00 ,  C08L21/00

Abstract: PURPOSE:To obtain a rubber composition excellent in all of heat-resistant adhesion, wet heat-resistant adhesion and initial adhesion between rubber and steel cord, by mixing a rubber with a cobalt oxyketone complex and a bismaleimide compound. CONSTITUTION:A rubber composition is prepared by mixing 100pts.wt. rubber component containing at least 70pts.wt. at least either of a natural rubber and a synthetic polyisoprene rubber with 0.01-1pt.wt. (in terms of the Co content) at least one cobalt oxyketone complex of formula I (wherein X1-X4 are each a 1-18C alkyl, a 3-12C cycloalkyl, a 6-14C aryl or the like) or formula II (wherein Y1-Y10 are each H, a 1-18C alkyl, a 3-12C cycloalkyl, a 6-14C aryl, a halogen or the like) and 0.2-10pts.wt. bismaleimide compound of formula III (wherein Z is a 2-10C hydrocarbon). This rubber composition is improved in all of heat-resistant adhesion, wet heat-resistant adhesion and initial adhesion between rubber and steel cord and can be applied to steel-reinforced conveyor belts, steel-reinforced hoses, rubber vibration isolators, earthquake-proof rubbers, etc. as well as can be used suitably for tire steel belts or steel carcass ply.

公开(公告)号：JPS6470539A

公开(公告)日：1989-03-16

申请号：JP14184088

申请日：1988-06-10

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO ,  YAMAMOTO HISAO ,  OKAMURA NOBUYUKI

IPC: C08K5/18 ,  B60C1/00 ,  B60C11/00 ,  C08K5/17 ,  C08K13/02 ,  C08L7/00 ,  C08L21/00

Abstract: PURPOSE:To obtain a pneumatic tire, by blending specific amounts of a specific p-phenylenediamine derivative and specified carbon black in combination and using the resultant rubber composition having improved gripping performance without impairing characteristics, such as heat resistance, in a tread. CONSTITUTION:A pneumatic tire obtained by blending 100pts.wt. raw material rubber consisting of natural rubber and/or synthetic rubber with (A) 2.5-20pts. wt. p-phenylenediamine derivative expressed by formula I or II (R is alkyl, cycloalkyl, etc.) (e.g. N-methacryloyl-N'-phenyl-p-phenylenediamine) and (B) 40-150pts.wt. carbon black having 110-190m /g nitrogen adsorption specific surface area (N2SA) and 100-140ml/100g dibutyl phthalate oil absorption (DBP value).