公开(公告)号：JPH04205982A

公开(公告)日：1992-07-28

申请号：JP33608590

申请日：1990-11-30

Applicant: KAO CORP

Inventor： TAKAHASHI KEIZO ,  TOJO TAKEHIKO ,  UEDA YUKIHIRO ,  IMAKI KEIJI

IPC: G11B33/14 ,  G11B5/00 ,  G11B23/113

Abstract: PURPOSE:To prevent deformation in a high temperature environment by forming a top half, bottom half, lid, slider and window which comprise a tape cassette, with a resin having special properties. CONSTITUTION:Among the component parts which comprise the tape cassette, the top half 2, bottom half 3, lid 5, slider 6 and window 8 are formed with the resin having properties of 8mum or less penetration in the test in which a piece of resin is pressed with a 0.7mm diameter pin with 50g load, under the environment of 100 deg.C for 5 hours, and then measured for the penetration of the pin into the resin. Consequently, the tape cassette is not deformed by heat even if it is left in the high temperature environment where the temperature goes up nearly 100 deg.C, and it may be loaded into a drive to run the tape after being exposed to such environment.

公开(公告)号：JPH05174363A

公开(公告)日：1993-07-13

申请号：JP33897291

申请日：1991-12-20

Applicant: KAO CORP

Inventor： KUDO MASUO ,  UEDA YUKIHIRO

IPC: G11B5/708 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  C10M103/02 ,  C10N20/06 ,  C10N40/18 ,  G11B5/71 ,  G11B5/73

Abstract: PURPOSE:To provide a magnetic recording medium in which a magnetic layer is hard to be worn and is superior in the durability for environmental change. CONSTITUTION:In the magnetic recording medium in which the magnetic layer containing magnetic powder and a binder is provided on a substrate, the magnetic layer is characterized by incorporating the components described hereunder; (1), (2) and (3). (1) Carbon black with 25-130nm of the average single particle diameter and 300-550ml oil absorption/100g carbon black. (2) Carbon black with 300-1000nm of the average single particle diameter. (3) At least one kind selected from higher fatty acids and fatty acid esters having

公开(公告)号：JPH05174362A

公开(公告)日：1993-07-13

申请号：JP33897191

申请日：1991-12-20

Applicant: KAO CORP

Inventor： KUDO MASUO ,  UEDA YUKIHIRO

IPC: G11B5/708 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  C10M103/02 ,  C10N40/18 ,  G11B5/73

Abstract: PURPOSE:To provide a magnetic recording medium having an excellent lubricity and durability by incorporating a metallic salt of fatty acid and carbon black having a specific average single particle diameter in a magnetic layer. CONSTITUTION:The metallic salts of 12-18C higher fatty acids such as Zn stearate, Ba stearate, Ca stearate, and Al, oleic acid are used 3-15 pts.wt. for 100 pts.wt. of magnetic powder. Also the average single particle diameter of the carbon black is 0.2-1.0mum, and is preferably in a range of 3-1.0mum and the carbon black is used 3-15 pts.wt. for 100 pts.wt. of the magnetic powder. The magnetic powder is an acicular fine gamma-Fe2O3, or a Co doped gamma-Fe2O3, etc., and as the binder polyurethane and polyvinyl chloride, etc., are used and 15-60 pts.wt. of it are used for 100 pts.wt. of the magnetic powder. The mixture is applied on e.g. a substrate of polyethylene terephthalate.

公开(公告)号：JPH05159273A

公开(公告)日：1993-06-25

申请号：JP32564191

申请日：1991-12-10

Applicant: KAO CORP

Inventor： YANAI HIDETOSHI ,  UEDA YUKIHIRO

IPC: G11B5/70 ,  G11B5/71 ,  G11B5/735

Abstract: PURPOSE:To provide the magnetic recording medium having excellent traveling stability. CONSTITUTION:The magnetic recording medium is constituted by providing a magnetic layer on one surface side of a nonmagnetic base and providing a resin coating film layer contg. carbon black on the other surface side. The carbon black of the resin coating film layer has characteristic of about 300 to 500ml/100g oil absorption. Further, higher fatty acid and/or fatty acid ester having about

公开(公告)号：JPH04205983A

公开(公告)日：1992-07-28

申请号：JP33608690

申请日：1990-11-30

Applicant: KAO CORP

Inventor： TAKAHASHI KEIZO ,  TOJO TAKEHIKO ,  UEDA YUKIHIRO ,  IMAKI KEIJI

IPC: G11B33/14 ,  G11B23/113

Abstract: PURPOSE:To prevent read errors due to the attachment of dust, etc., and malfunction due to the increase of torque by making electrical resistance small on the surface of a top half, bottom half, lid, slider and window among the parts comprising this tape. cassette. CONSTITUTION:Among the component parts of the tape cassette 1, the top half 2, bottom half 3, lid 5, slider 6 and window 8 are made to show the electrical resistance on their faces less than 1X10 ohms/square. In order to make the electrical resistance on the faces of the component parts smaller than 1X10 ohms/square, the component parts are desirably formed with ABS group resins, AS resin, POM resin, etc. Consequently, dust, dirt, etc., are not attached to the faces of the component parts of the tape cassette 1, and the danger of producing read errors due to dust, etc., or malfunction due to increase in torque is eliminated.

公开(公告)号：JPS6215566B2

公开(公告)日：1987-04-08

申请号：JP12593776

申请日：1976-10-19

Applicant: KAO CORP

Inventor： KAZAMA YOSHIHIDE ,  UEDA YUKIHIRO ,  TSUNODA JUZO ,  SUZUKI JUJI ,  YASUDA YUTAKA

IPC: C08G18/00 ,  C08G18/10 ,  C08G18/67

公开(公告)号：JPH05174532A

公开(公告)日：1993-07-13

申请号：JP33817891

申请日：1991-12-20

Applicant: KAO CORP

Inventor： NAKAYAMA HIDEHIKO ,  UEDA YUKIHIRO

IPC: G11B5/702 ,  C09D5/23 ,  C09D7/12 ,  C09D183/04 ,  C09D183/12 ,  G11B5/712 ,  G11B5/73 ,  G11B23/03 ,  G11B23/50

Abstract: PURPOSE:To furnish a magnetic disk held in a case, for which a countermeasure to sticking of dust is made effectively and from which an improvement in a recording-reproducing characteristic can be expected. CONSTITUTION:A magnetic disk having a magnetic coat is held in a case provided with a liner inside. The magnetic coat contains a conductive macromolecular compound based on a pi conjugated structure. The liner contains, in a molecule, modified chain polydimethylsiloxane having a polyether group or the polyether group and an epoxy group.

公开(公告)号：JPH0562168A

公开(公告)日：1993-03-12

申请号：JP22270591

申请日：1991-09-03

Applicant: KAO CORP

Inventor： UEDA YUKIHIRO ,  KAMIYAMA KENICHI

IPC: G11B5/72 ,  C09D5/23 ,  G11B5/725

Abstract: PURPOSE:To enable a still durability and an electrification proofness to be increased for high-density recording by cladding an alumina thin film which originates in alumina sol on a surface of a magnetic layer when forming the magnetic layer on a non-magnetic support as a magnetic recording medium. CONSTITUTION:When a magnetic layer is formed on a non-magnetic support consisting of polyethylene telephthalate, etc., furthermore, an alumina thin film with a thickness of approximately 0.01 to 1mum is adhered on this surface. When this is to be clad, a colloid-shaped alumina with a particle diameter of approximately 20 to 200Angstrom is used for coating. However, in the case of calendar treatment, a silica sol of a maximum of 25wt.% may be contained to reduce a heat treatment temperature. Also, normal needle-shaped minute gamma-Fe2O3, Fe-Co, etc., are used as a magnetic powder which is used for a medium and polyurethane resin, polyester resin, etc., are used as a binder. Also, a dispersant, a lubricant, an abrasive, a rust-proof agent, and a mold-proof agent may be added as additives.

公开(公告)号：JPS5350297A

公开(公告)日：1978-05-08

申请号：JP12593776

申请日：1976-10-19

Applicant: KAO CORP

Inventor： KAZAMA YOSHIHIDE ,  UEDA YUKIHIRO ,  TSUNODA YUUZOU ,  SUZUKI YUUJI ,  YASUDA YUTAKA

IPC: C08G18/00 ,  C08G18/10 ,  C08G18/67

Abstract: PURPOSE:To prepare the title curable liquid resin composition of low viscosity and capable of controlling crosslinking reaction easily and storing with ease under stable condition over a long period, by mixing an organic diisocyanate with a prepolymer obtained by the reaction of a specific unsaturated dial composition with the same sort of the organic diisocyanate as the above.

公开(公告)号：JPH04205984A

公开(公告)日：1992-07-28

申请号：JP33608790

申请日：1990-11-30

Applicant: KAO CORP

Inventor： TAKAHASHI KEIZO ,  TOJO TAKEHIKO ,  UEDA YUKIHIRO ,  IMAKI KEIJI

IPC: G11B33/14 ,  G11B23/113

Abstract: PURPOSE:To increase durability and to prevent thermal deformation in the environment of high temperature and much dust and dirt by forming a top half, bottom half, lid, slider and window among the component parts of the tape cassette with a specific resin and specifying an electrical resistance on the faces of these parts. CONSTITUTION:Among the component parts of the tape cassette, the top half 2, bottom half 3, lid 5, slider 6 and window 8 are formed with the resin having properties of 8mum or less penetration in the test in which a piece of resin is pressed with a 0.7mm diameter pin with 50g load, under the environment of 100 deg.C for 5 hours, and then measured for the penetration of the pin into the resin. And, the electrical resistance of the surfaces of the parts is made smaller than 1X10 ohms/square. Consequently, the tape cassette is durable and not deformed by heat in the environment of high temperature, much dust and dirt, and the danger of read errors due to the attachment of dust, dirt, etc., is eliminated.