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    DISK CARTRIDGE AND MANUFACTURING METHOD THEREFOR
    11.
    发明专利
    DISK CARTRIDGE AND MANUFACTURING METHOD THEREFOR 失效

    公开(公告)号：JPH10106206A

    公开(公告)日：1998-04-24

    申请号：JP28008396

    申请日：1996-09-30

    Applicant: TORAY INDUSTRIES

    Inventor： IWAMOTO MASAAKI ,  KISHI FUMIAKI ,  HATSU TOSHIHIRO

    IPC: G11B23/03

    Abstract: PROBLEM TO BE SOLVED: To provide a disk cartridge, having sufficient mechanical strength and capable of being surely fuse-bonded with less errors when being fused, and a manufacturing method therefor. SOLUTION: The disk cartridge includes a recording disk 1, and a cartridge case 2 which houses the recording disk 1 rotatably and it at least partly made of a synthetic resin or a thermoplastic material. The cartridge case 2 is formed by fuse-bonding two half-cases 2a and 2b. In the disk cartridge having the above configuration, at least one of the half-cases 2a and 2b has at least one fusing projection to be at least partly melted so as to be used for the above- mentioned fusing. A portion to be melted, as set forth above, of the at least one fusing projection has a cross-sectional area in the range of 0.002 to 0.5mm prior to the fusing.

    MANUFACTURE OF SUBSTRATE OF OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING MEDIUM
    12.
    发明专利
    MANUFACTURE OF SUBSTRATE OF OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING MEDIUM 失效

    公开(公告)号：JPH09198723A

    公开(公告)日：1997-07-31

    申请号：JP2316596

    申请日：1996-01-16

    Applicant: TORAY INDUSTRIES

    Inventor： KINOSHITA FUMIO ,  HATSU TOSHIHIRO ,  NAKANISHI TOSHIHARU

    IPC: B29C45/26 ,  B29C45/38 ,  B29C45/56 ,  B29C45/76 ,  G11B7/26

    Abstract: PROBLEM TO BE SOLVED: To obtain a substrate which improves the durability of a cut punch, is less in deformation at the inner peripheral part, is good in machining accuracy and is less in fluctuation over a long period, and further to obtain the substrate which generates little strain at the time of cutting driving holes and enables the reduction of double refraction. SOLUTION: When the fused resin is injected and filled into the cavity 31 of a molding die 20, to which a stamper 30 for forming a groove and/or pit for information recording on the substrate is fitted, and a gate part 40 of the cut punch 34 at the inside of the die 20 is cut to manufacture the substrate of an optical recording medium, the cut punch 34 is constituted so as to be held forwarding and then followed by backwarding, while controlling the cut punch pressure in the releasing direction in plural steps or immediately after the lapse of a very short time or during the time until the opening of a mold after the gate part 40 is cut.

    PRODUCTION OF OXYMETHYLENE COPOLYMER
    14.
    发明专利
    PRODUCTION OF OXYMETHYLENE COPOLYMER 失效

    公开(公告)号：JPH051126A

    公开(公告)日：1993-01-08

    申请号：JP15206491

    申请日：1991-06-24

    Applicant: TORAY INDUSTRIES

    Inventor： HATSU TOSHIHIRO ,  MAKABE YOSHIKI ,  YAMAMOTO YOSHIYUKI

    IPC: C08G2/28 ,  C08G2/18 ,  C08G2/30

    Abstract: PURPOSE:To obtain the copolymer having excellent thermal stability and mechanical properties by polymerizing trioxane with a cyclic ether in the presence of a specific polymerizing catalyst, then after the polymerization, adding a specific compound to deactivate the catalyst and further adding a stabilizer, water and heating. CONSTITUTION:A mixture of trioxane and a cyclic ether is polymerized in the presence of 0.001-0.1 pt.wt. (use) based on 100 pts.wt. trioxane of a catalyst comprising boron trifluoride, boron trifluoride hydrate and a coordinated compound of boron trifluoride and an O or S-containing organic compound, and then preferably 0.01-3 pts.wt. based on 100 pts.wt. oxymethylene copolymer of a trifunctional organic phosphorus compound (preferably triphenylphosphine) shown by the formula (R to R are alkyl, aryl or mercapto) is added to deactivate the catalyst and a stabilizer (preferably hindered phenol compound) and water are added to the polymer system and heated at 100-260 deg.C to give the objective copolymer comprising an oxymethylene unit and an oxyalkylene unit.

    POLYOXYMETHYLENE RESIN COMPOSITION
    15.
    发明专利
    POLYOXYMETHYLENE RESIN COMPOSITION 失效

    公开(公告)号：JPH03126751A

    公开(公告)日：1991-05-29

    申请号：JP26452289

    申请日：1989-10-11

    Applicant: TORAY INDUSTRIES

    Inventor： MAKABE YOSHIKI ,  HATSU TOSHIHIRO ,  YAMAMOTO YOSHIYUKI

    IPC: C08L59/04 ,  C08L59/00

    Abstract: PURPOSE:To obtain the subject composition, having an ultrafine and homogeneous crystal structure and relaxed internal stress and capable of providing products excellent in mechanical strength, surface appearance and heat aging resistance by blending a polyoxymethylene resin with an aliphatic polyether and/or aliphatic polyester. CONSTITUTION:A polyoxymethylene resin composition obtained by blending (A) 100 pts.wt. polyoxymethylene resin prepared by copolymerizing trioxane with a cyclic ether compound selected from ethylene oxide, 1,3-dioxolane, 1,3- dioxepane, 1,3,5-trioxepane and 1,3,6-trioxocane and a compound selected from phenyl glycidyl ether, styrene oxide and naphthyl glycidyl ether with (B) aliphatic polyether and/or (C) an aliphatic polyester in an amount of 0.01-20 pts.wt., preferably 0.05-10 pts.wt.

    OXYMETHYLENE MULTICOMPONENT COPOLYMER
    19.
    发明专利
    OXYMETHYLENE MULTICOMPONENT COPOLYMER 失效

    公开(公告)号：JPH04266917A

    公开(公告)日：1992-09-22

    申请号：JP2867291

    申请日：1991-02-22

    Applicant: TORAY INDUSTRIES

    Inventor： MAKABE YOSHIKI ,  HATSU TOSHIHIRO ,  YAMAMOTO YOSHIYUKI

    IPC: C08G2/22 ,  C08G2/18

    Abstract: PURPOSE:To obtain the title copolymer having high cycle moldability during injection molding and excellent mechanical properties, comprising trioxan, a specific cyclic ether compound and a specific compound such as styrene oxide. CONSTITUTION:The objective copolymer which is an oxymethylene multicomponent copolymer obtained by copolymerizing (A) trioxan with (B) a cyclic ether compound selected from ethylene oxide, 1,3-dioxolan, 1,3-dioxepan, 1,3,5-trioxepan and 1,3,6-trioxocane and (C) a compound selected from glycidyl phenyl ether, styrene oxide and glycidyl naphthyl ether, has correlation between a melting point Tm and temperature dropping crystallization temperature Tc satisfying the formula 15

    POLYOXYMETHYLENE COMPOSITION FOR MOLDING
    20.
    发明专利
    POLYOXYMETHYLENE COMPOSITION FOR MOLDING 失效

    公开(公告)号：JPH0314857A

    公开(公告)日：1991-01-23

    申请号：JP14830989

    申请日：1989-06-13

    Applicant: TORAY INDUSTRIES

    Inventor： OKITA SHIGERU ,  HATSU TOSHIHIRO ,  YAMAMOTO YOSHIYUKI

    IPC: C08L59/02 ,  C08K3/24 ,  C08K5/13 ,  C08K5/17 ,  C08L59/00

    Abstract: PURPOSE:To prepare a polyoxymethylene compsn. which is excellent in the mechanical strengths and hydrolysis resistance, neither releases formalin during molding, nor sticks to a mold by compounding a polyoxymethylene with a high-mol.wt. hindered amine having a specific structure, a hindered phenol antioxidant and a metal carboxylate. CONSTITUTION:A polyoxymethylene compsn. for molding is prepd. by compounding a polyoxymethylene homo- or copolymer; a hindered amine (A) of formula I [wherein R is H or a group of formula II (wherein R' is H or CH3); and (x), (y), and (z) are each 0-10 and may be the same or different] pref. having a mol.wt. of 2000 or higher; a hindered phenol antioxidant (B) having a mol.wt. of 400 or higher, e.g. triethylene glycol bis [3-(3-t-butyl-5- methyl-4-hydroxyphenyl)propionate]; and a metal salt of a 12C or higher carboxylic acid (C) (e.g. calcium stearate). The pref. amts. of A, B, and C are each 0.01-3 pts.wt. based on 100 pts.wt. polyoxymethylene homo- or copolymer.

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