公开(公告)号：JPH0725525B2

公开(公告)日：1995-03-22

申请号：JP2629784

申请日：1984-02-14

Applicant: KAO CORP

Inventor： YAMAUCHI MICHIHIDE ,  KISHINE NOBUYUKI ,  IMAMURA TETSUYA

IPC: G11B5/31 ,  C01B31/02 ,  C04B35/52 ,  G11B5/187 ,  G11B5/60 ,  H01F10/26 ,  H01F10/28

公开(公告)号：JPH06236544A

公开(公告)日：1994-08-23

申请号：JP2137893

申请日：1993-02-09

Applicant: KAO CORP

Inventor： ISHIKAWA ATSUSHI ,  YAMAUCHI MICHIHIDE

IPC: G11B5/84 ,  G11B5/73 ,  G11B5/704

Abstract: PURPOSE:To prevent the attraction of a magnetic recording medium to a head and to reduce error rate by forming the substrate of the magnetic recording medium with glassy carbon contg. fine particles of prescribed size as a component of a composite. CONSTITUTION:The objective substrate of a magnetic recording medium is formed with glassy carbon contg. fine particles of 0.1-1mum size as a component of a composite. The substrate has satisfactory surface smoothness, is free from microdefects and also has moderate surface roughness. It ensures high strength, high hardness and satisfactory shock resistance and is nonmagnetic and light in weight.

公开(公告)号：JPH0546973A

公开(公告)日：1993-02-26

申请号：JP20680191

申请日：1991-08-19

Applicant: KAO CORP

Inventor： YAMAUCHI MICHIHIDE ,  KOBAYASHI ISAO

IPC: G11B5/82 ,  G11B5/73 ,  G11B5/733 ,  G11B5/84

Abstract: PURPOSE:To obtain a substrate for magnetic disks having a high strength against bending by carbonizing a thermosetting resin or a composite material of the thermosetting resin and powdery graphite with a hot press. CONSTITUTION:This substrate 1 for magnetic disks is manufactured of vitreous carbon or a composite material of the vitreous carbon and graphite having a high strength against bending in the direction B of the substrate obtained by carbonizing a thermosetting resin or a composite material of the thermosetting resin and powdery graphite with a hot press which pressurizes the resin or material in the facial direction of a substrate 1 and, at the same time, making the substrate 1 anisotropic by applying a pressure A from the top and bottom of the substrate 1. Therefore, this substrate 1 has a light weight, excellent corrosion resistance, and heat resistance which can withstand a high temperature at the time of film formation, etc., and, at the same time, has excellent surface smoothness which can withstand specular finishing. In addition, the substrate has a high strength against bending and is free from deformation even when the thickness of the substrate is reduced.

公开(公告)号：JPH03290286A

公开(公告)日：1991-12-19

申请号：JP9215390

申请日：1990-04-09

Applicant: KAO CORP

Inventor： ISHIKAWA ATSUSHI ,  KAMIYAMA KENICHI ,  YAMAUCHI MICHIHIDE

IPC: B41M5/26 ,  G11B7/24 ,  G11B7/254 ,  G11B7/257

Abstract: PURPOSE:To obtain an optical recording medium in high productivity by a method wherein in an optical recording medium capable of writing and/or reading information by a laser beam, a light transmittant elastic protective film is provided to an incident surface side to the optical recording medium of a laser beam, and Vickers hardness of the elastic protective film is specified. CONSTITUTION:A light transmittnat elastic productive film is provided to an incident surface side to an optical recording medium of a laser beam, the optical recording medium being capable of writing and/or reading information by a laser beam, and Vickers hardness of the elastic protective film if 20gf/mum or under. As materials composing the elastic protective film of 20gf/mum or under in Vickes hardness, materials having acrylic materials principally is preferable since its application and curing method are simple. Since Vickers hardness of the elastic protective film is 20gf/mum of under, impairing the optical recording medium is much less, and extremely high quality optical recording medium can be obtained in good productivity.

公开(公告)号：JPH0370315B2

公开(公告)日：1991-11-07

申请号：JP5829583

申请日：1983-04-01

Applicant: KAO CORP

Inventor： KISHINE NOBUYUKI ,  IMAMURA TETSUYA ,  TAKEUCHI SETSU ,  YAMAUCHI MICHIHIDE

IPC: G11B23/033 ,  G11B23/02 ,  G11B23/03

公开(公告)号：JPH02267771A

公开(公告)日：1990-11-01

申请号：JP8924689

申请日：1989-04-07

Applicant: KAO CORP

Inventor： ISHIKAWA ATSUSHI ,  YAMAUCHI MICHIHIDE ,  ISOBE TSUTOMU

IPC: G11B17/34

Abstract: PURPOSE:To eliminate contact of a magnetic disk with a regulating surface of a sliding part by providing the sliding part with a slant surface in order to bring a corner part of a recessed groove of the sliding part on the upstream side and a corner part of the slant surface on the downstream side into contact with a rotating flexible magnetic disk. CONSTITUTION:The sliding part 2 is formed with the recessed groove 22 which is opened in the inside direction of the rotational surface opposite to a movable range of a magnetic head 3. Then, the part 2 is formed with the slant surface on the downstream side of the groove 22 as the farther the downstream side the closer the position to the flexible magnetic disk 1. And, a parallel surface 24a to the rotational surface of the disk 1 is formed on the upstream side. Then, the part 2 is in contact to the disk 1 at the corner part 25a extending in the radial direction of the groove 22 on the upstream side of the groove 22 and also as the corner part 26 extending in the radial direction formed in the downstream of the slant surface 24b on the downstream side. As a result, no contact is allowed between the regulating surface of the part 2 and the disk 1 due to sucking each other, thus obtaining good recording and reproducing characteristics.

公开(公告)号：JPH01320255A

公开(公告)日：1989-12-26

申请号：JP15406488

申请日：1988-06-22

Applicant: KAO CORP

Inventor： SAKAGUCHI MIKIO ,  YAMAUCHI MICHIHIDE

IPC: C04B35/00 ,  C04B35/56 ,  C04B35/565 ,  C04B35/58 ,  C04B35/581 ,  C04B35/583 ,  C04B35/584

Abstract: PURPOSE:To obtain the title composite material having excellent sliding characteristic and worked surface precision by preforming a mixture of a BN precursor, wherein the interfacial spacing by X-ray diffraction and size of the crystallite are specified, and ceramic grains in a specified ratio, and then calcining the preform under pressure. CONSTITUTION:A mixture of 50-50wt.% BN precursor, wherein the BN (002) interfacial spacing by X-ray diffraction is controlled to 2.15-2.40Angstrom and the size of the crystallite to 50-2,000Angstrom , and 95-50wt.% ceramic grains is prepared. The mixture is preformed, and the preform is then calcined at 10-120MPa pressure to obtain the composite material. When 96% ceramic. When the interfacial spacing and size of the BN precursor are respectively higher than the upper limit and lower than the lower limit, crystallization by calcination is not sufficient, and the sliding property, workability, etc., due to mixing is not improved. When the interfacial spacing and size of the crystallite are respectively lower than the lower limit and higher than the upper limit, the grains of both components are not uniformly mixed, the kind of the composite ceramic is restricted, and the strength of the calcined body and the worked surface precision are deteriorated.

公开(公告)号：JPH01320254A

公开(公告)日：1989-12-26

申请号：JP15406388

申请日：1988-06-22

Applicant: KAO CORP

Inventor： SAKAGUCHI MIKIO ,  YAMAUCHI MICHIHIDE ,  OTSUKA KAZUHIRO

IPC: C04B35/00 ,  C04B35/52

Abstract: PURPOSE:To produce the title composite material capable of being sintered to high density and having excellent strength, hardness, fracture toughness, and sliding characteristic by specifying the interfacial spacing of the carbon part of the composite material by X-ray diffraction and the ratio of the ceramic to carbon. CONSTITUTION:The (002) interfacial spacing of the carbon part by X-ray diffraction is controlled to 3.35-3.45Angstrom in the ceramic-carbon based composite material, and the material consists of 50-96vol.% ceramic and 50-4vol.% carbon. When the ceramic content of the material is controlled to 96vol.% ceramic. Carbon powder or org. matter capable of being graphitized (

公开(公告)号：JPS6469566A

公开(公告)日：1989-03-15

申请号：JP22711587

申请日：1987-09-09

Applicant: KAO CORP

Inventor： WAKASA MASANOBU ,  YAMAUCHI MICHIHIDE ,  ISHIKAWA ATSUSHI

IPC: C04B35/52 ,  C01B31/02

Abstract: PURPOSE:To obtain a glassy carbon material having low friction resistance to an opposite material, excellent wear resistance of its own and durability, by curing a thermosetting polymer material, heating the material under a specific treating condition and carbonizing. CONSTITUTION:In production of a glassy carbon material including (A) a process to curing a polymer material consisting essentially of a thermosetting polymer and (B) a process to heat and to carbonize the polymer material obtained by the process A, the process B is carried out as follows. Namely, in the carbonizing baking process B, (B-1) pretreatment process of pretreating at 800-1,200 deg.C and (B-2) pressurizing and heat-treating process of heat-treating in an inert atmosphere at 1,200-1,600 deg.C while applying a pressure of >=1,000 atmosphere are carried out. A monomer for a thermosetting polymer may be used as the polymer material used or a blend of a curing precursor and ultrafine particles or whiskers as a filler may be used.

公开(公告)号：JPS64321B2

公开(公告)日：1989-01-06

申请号：JP3970983

申请日：1983-03-09

Applicant: KAO CORP

Inventor： YAMAUCHI MICHIHIDE ,  KISHINE NOBUYUKI ,  IMAMURA TETSUYA

IPC: C04B35/52 ,  C01B31/02