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    MAGNETIC RECORDING MEDIUM
    81.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH06208719A

    公开(公告)日：1994-07-26

    申请号：JP24502693

    申请日：1993-09-30

    Applicant: BASF MAGNETICS GMBH

    Inventor： AUGUSUTO REENAA ,  NORUBERUTO SHIYUNAIDAA ,  BUERUNAA BARUTSU ,  BUERUNAA RENTSU ,  MIHIYAERU BOBURITSUHI ,  ARUBERUTO KOORU

    IPC: C09D5/23 ,  C09D133/04 ,  C09D133/16 ,  G11B5/702 ,  G11B5/708

    Abstract: PURPOSE: To obtain a magnetic recording medium having stability to he degradation in the chemical quality without deteriorating its magnetic characteristics by forming magnetic layers having a prescribed softening point and incorporating perfluoroacrylate of a prescribed weight of the weight of chromium dioxide into these layers. CONSTITUTION: This magnetic recording medium is formed of a nonmagnetic substrate and at least one layer of the magnetic layers which are applied on this substrate, are formed of a magnetic material well dispersed into a polymer binder and known additives and contain at least 30wt.% ferromagnetic chromium dioxide. The magnetic layers contain the perfluoroacrylate having the softening point of >=110 deg.C at 0.1 to 8wt.% of the weight of the chromium dioxide. The magnetic layers preferably contain the perfluoroacrylate having the softening point of >=120 deg.C at 0.4 to 4wt.% of the weight of the chromium dioxide. As a result, the magnetic recording medium mainly contg. the chromium dioxide which does not deteriorate the magnetic characteristics, has the improved stability to the degradation in the chemical quality and does not impair the mechanical characteristics in spite of a temp. changing at a high temp. is obtd.

    PRODUCTION OF MAGNETIC RECORDING MEDIUM
    82.
    发明专利
    PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH06203377A

    公开(公告)日：1994-07-22

    申请号：JP29032893

    申请日：1993-11-19

    Applicant: BASF MAGNETICS GMBH

    Inventor： ARUFUREETO HAAGEMAIAA ,  HARUTOMUUTO HIBUSUTO ,  RIHIYARUTO MAURAA ,  HERUMUUTO YAKUSHIYU ,  DEIITAA BOIERURE ,  YOHANESU HAITSU

    IPC: G11B5/842 ,  G11B5/84

    Abstract: PURPOSE: To improve the adhesiveness of a magnetic layer to a polymer substrate by irradiating the substrate with UV having such energy density as not to cause ablation in a specified wavelength region by means of excimer laser. CONSTITUTION: A polymer substrate is irradiated with UV having such energy density as not to cause ablation in the wavelength region of 150-400nm by means of a noninterference excimer plan or excimer laser. The energy density depends on the polymer. In this case, UV excimer laser is preferably used and the number of pulses is preferably made as small as 1-25 pulses per unit area of the substrate. The treated substrate is coated with a magnetic coating material prepd. by dispersing a pigment in a binder mixture contg. polyurethane, a dried binder, a dispersant, a lubricant and inorg. filler particles and then orientation with a magnet and smoothening by calendering are carried out.

    REEL CONTAINER FOR MAGNETIC TAPE
    84.
    发明专利
    REEL CONTAINER FOR MAGNETIC TAPE 失效

    公开(公告)号：JPH06179486A

    公开(公告)日：1994-06-28

    申请号：JP22433793

    申请日：1993-09-09

    Applicant: BASF MAGNETICS GMBH

    Inventor： HARUTOMUUTO TEIIRE

    IPC: B65D85/67 ,  B65D85/672 ,  G11B23/02 ,  G11B23/027

    Abstract: PURPOSE: To provide a container for magnetic tape that certainly protects the tape from external forces such as a shock, dropping, dust, moisture or the like, and it is simple to fabricate, low-cost and of reduced volume, namely occupied space. CONSTITUTION: A bottom tray 1 is provided on its reel with a projection 3 having notches 5 distributed on its periphery and a round top 6 in a projection 3 so slanted as to form a concave to its inward. The top tray 2 is provided with a projected annular part 8 with a diameter larger than the projection 3, a lug 9 is provided on at least one peripheral edge side, and its leading edge has been bent so as to engage in a groove 9' shaped in correspondence to the other tray in the closed state. Another lug 10 with a similar structure is injection-molded on a slanted end 11 in a holding handle 12, and attaches on the slanted ends 11 and 11' of the both trays handles 12 and 12' retained mutually and complementarily so as to be mutually engaged when the container is closed.

    MAGNETIC RECORDING MEDIUM
    85.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH06176346A

    公开(公告)日：1994-06-24

    申请号：JP21605493

    申请日：1993-08-31

    Applicant: BASF MAGNETICS GMBH

    Inventor： HERUMUUTO YAKUSHIYU ,  KURAUSU DEIITAA SHIYOOMAN ,  MIHIYAERU FUITSUTSUFUERUTO ,  HERUMAN RORAA ,  RAINHORUTO BAURU ,  EDOBUIN ROOTOFUSU

    IPC: C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/706 ,  G11B5/73

    Abstract: PURPOSE: To obtain a magnetic recording medium which contains main chromium dioxide as a magnetic material and does not have the drawbacks of drop-outs in copying by a sprinter process method. CONSTITUTION: The magnetic memory medium consists of a nonmagnetic substrate and a magnetic layer applied thereon. This magnetic layer is obtd. by applying a dispersion prepd. by uniformly dispersing at least 40wt.% acicular ferromagnetic chromium dioxide in a polymer binder consisting of polyurethane as a base on the substrate, then drying the coating. The magnetic layer in particular has an inside surface area of 5 to 30m /cm and the pigment concn. PVC per volume attains 45 to 65%. The magnetic recording medium is thus made adaptable to the sprinter process of rapid copying.

    CONTAINER FOR TAPE CASSETTE
    86.
    发明专利
    CONTAINER FOR TAPE CASSETTE 失效

    公开(公告)号：JPH06171690A

    公开(公告)日：1994-06-21

    申请号：JP16779993

    申请日：1993-07-07

    Applicant: BASF MAGNETICS GMBH

    Inventor： KURAUSU SHIETORE

    IPC: B65D85/575 ,  G11B23/00 ,  G11B23/02 ,  G11B23/023

    Abstract: PURPOSE: To reduce height of a container without changing direction of inserting a cassette into the container by using the container with a rectangular parallelepiped form having a decreasing wall thickness along its transverse axis for a compact cassette with an elevated head. CONSTITUTION: A container for a tape cassette has a bottom wall 7 and a lid 8, which is formed with a pocket 11 for admitting a head 9 of the cassette 6. The pocket 11 has its front wall 12. A lid wall 13 of the lid 8 reduces its wall thickness d in the direction from its externally longitudinal edge L to the pocket 11. Namely, the wall thickness d gradually decreases from the edge L to portion A and slightly increases again from A to B portion. Therefore, the thickness is thinnest at A and discontinuously reduced at the orthogonal cross-lines. Accordingly, there appears a slanting rectangular-parallelepiped receiving space V within external shapes of the wall 13 and 14, and the whole container can reduce its height.

    MAGNETIC TAPE CONTAINING ABRASIVE MATERIAL
    88.
    发明专利
    MAGNETIC TAPE CONTAINING ABRASIVE MATERIAL 失效

    公开(公告)号：JPH0668433A

    公开(公告)日：1994-03-11

    申请号：JP15727591

    申请日：1991-06-28

    Applicant: BASF MAGNETICS GMBH

    Inventor： ARUBUREHITO KORAA ,  HANSUUHAINRITSUHI KUREDONAA

    IPC: G11B5/41 ,  C09D5/23 ,  G11B5/708 ,  G11B5/73

    Abstract: PURPOSE: To obtain a magnetic tape containing an abrasive which does not cause excess abrasion of a video head but decrease the peaks on the rough surface by grinding and moreover, which does not give bad effect on the magnetic and mechanical characteristics of the magnetic tape. CONSTITUTION: The magnetic tape consists of a nonmagnetic base layer and a magnetic layer formed on the base layer. The magnetic layer contains a magnetic hard pigment and a nonmagnetic pigment dispersed in a polymer binder. The magnetic tape has a function to polish and clean the contact part of a magnetic tape cassette and a recording/reproducing device in contact with the magnetic layer. The magnetic pigment consists of acicular CrO2 having at least 26m /g BET value, and the nonmagnetic pigment has at least 9 Mohs' hardness and 0.1 to 2μm primary particle size and 1 to 130m /g BET value. The magnetic layer has

    89.
    发明专利
    失效

    公开(公告)号：JPH05242642A

    公开(公告)日：1993-09-21

    申请号：JP30332592

    申请日：1992-11-13

    Applicant: BASF MAGNETICS GMBH

    Inventor： BUORUFUGANGU KURAMAA ,  KURAUSU SHIETORE

    IPC: G11B23/033 ,  G11B23/087 ,  G11B23/50

    Abstract: PURPOSE: To hardly allow a secular change by constituting a film pressing member out of a plastic material having a glass transition point of more than a specific temp. CONSTITUTION: A 3.5 inch diskette or a microdiskette is composed of a bottom housing part 1, a lid housing part 2, a magnetic disk 3, small components consisting of a slide 4 and a slide closing spring 5, a lift member 6 and a write protective member 7. The magnetic disk 3 has a hub 8 connected with the disk in the middle. A central part of the hub 8 is fitted with its outer circumferential edge part into a central opening hole part of the bottom housing part 1, so that the fitted magnetic disk 3 can be rotated in the housing parts 1 and 2. In this containers for magnetic recording medium, the film pressing member 6 is constituted of a plastic material (excluding polycarbonate) having a glass transition point of >=80 deg.C.

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