Abstract: A magnetic recording medium having a magnetic recording layer on at least one surface of a non-magnetic support, wherein the magnetic recording layer has thereon a lubricant layer containing at least one fluoroalkyl sulfo compound having an ether or ester linkage, which is represented by the following formula (1). The magnetic recording medium is free from corrosion of the magnetic recording layer and has a low coefficient of friction and excellent running durability and shelf stability. The lubricant layer is particularly suitable for a magnetic recording medium having a metal thin film with or without an inorganic protective film as a magnetic recording layer.(Rf--A--R--SO.sub.3).sub.k X Formula (1)wherein Rf represents a fluoroalkyl group or a perfluoroalkyl group; A represents ##STR1## R represents an alkylene group; k represents an integer of 1 or 2; and X represents --H, --M, --MH (wherein M is an alkali metal or an alkali earth metal), or any one of primary to quaternary ammoniums.

Abstract: A magnetic recording medium having stable running properties and durability even under the severe environmental conditions of low or high humidity is disclosed. The magnetic recording medium comprises a non-magnetic support and a magnetic layer of a thin ferromagnetic metal film formed thereon, wherein the thin ferromagnetic metal film has thereon at least one member selected from fluorine-containing multi-chain type compounds represented by the following general formula (I):(P).sub.m Q(R).sub.n (I)wherein Q represents (m+n) valent organic residue; R represents a monovalent group comprising a fluoropolyether chain; P represents a monovalent oxo-acid derivative group or a monovalent group which is a salt of an oxo-acid derivative; m represents an integer of 1 or more; and n represents an integer of 2 or more.

Abstract: A ferromagnetic thin metal film type magnetic recording medium is disclosed, comprising a non-magnetic support having thereon a ferromagnetic thin metal film, wherein a perfluoropolyether having at least one polar group having the saturation adsorption amount (mg/m.sup.2) of at least 4.0 mg/m.sup.2 against the ferromagnetic thin metal film is coated or applied onto the surface of the ferromagnetic thin metal film. There is also disclosed a method for preparing a ferromagnetic thin metal film type magnetic recording medium comprising forming a ferromagnetic thin metal film, subjecting the ferro-magnetic thin metal film to a treatment with oxygen gas, ozone gas, a heat treatment or a treatment with an inert gas, and then applying a perfluoropolyether having at least one polar group to the ferromagnetic thin metal film.

Abstract: A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon a magnetic layer comprising a ferromagnetic metal thin film, wherein a protective layer made mainly of a fluorine-based resin represented by formula (I): ##STR1## wherein m is an integer of 1 or more, and n is an integer of 10 or more, is provided on the ferromagnetic metal thin film.

Abstract: A magnetic recording medium comprising a non-magnetic support having a magnetic layer provided thereon, wherein a higher fatty acid hydroxylaluminum salt represented by formula (I) is provided in or on the magnetic layer:(R.sup.1 COO).sub.n Al(OH).sub.3-nwherein R.sup.1 is a hydrocarbon group having from 10 to 26, and n is an integer of 1 or 2. The magnetic recording medium has a low coefficient of friction and good running durability even when used or stored under high-temperature and high humidity conditions.

Abstract: A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising ferromagnetic particles dispersed in a binder, said magnetic layer having therein or on its surface a fluorine-containing oligomer surfactant which has a side chain having a poly(alkylene oxide) structure, a side chain terminated with a perfluoroalkyl group, and a side chain derived from an ester of acrylic or methacrylic acid with an aliphatic alcohol.

Abstract: A flexible optical recording material in the shape of tape or floppy disk comprising an optically isotropic laminate (A) comprising at least one thermoplastic gas-impermeable synthetic resin film layer (1) and at least one cured crosslinking resin layer (2), said layers having been formed by casting and having a retardation value of not less than 80 nm as a whole, and a recording layer (B) disposed on at least one side of said optically isotropic laminate.

Abstract: A liquid crystal display panel electrode plate having a transparent electrode on at least one side is described. This electrode plate comprises an optically non-rotatory transparent film substrate layer having a retardation value of not more than 30 nm as formed from a polycarbonate resin, polyether sulfone resin, polysulfone resin or polyarylene ester resin, and anchor layer formed from a solution or dispersion of an anchor agent in aqueous medium as disposed on at least one side of the substrate layer, and one or more protective layers of gas-impermeable resin or/and cured crosslinkable resin as disposed on the anchor layer. This electrode plate is optically transparent to visible light, optically isotropic, resistant to moisture, chemicals, liquid crystals and gas-impermeable.

Abstract: An improvement in a door fastening apparatus wherein a bolt receiving and supply device is provided alongside of a fastening head unit. It includes a bolt supplying head connected to a parts feeder and a laterally movable transferring head receiving bolts from the supply head and moving over to in front of the nut runner to deliver the bolts. The supply head can be fed through a bolt pressure feeding tube. The transferring head has a clamping cylinder therein for clamping the bolt in the receiving opening.

Abstract: A tube for integrated circuits, which comprises:an electrically conductive substrate sheet formed by laminating an electrically conductive thin layer onto at least one side of a transparent sheet of a synthetic resin, said substrate sheet being bent plural times in a parallel fashion to thereby form an upper section, left and right sections depending therefrom, left and right bottom sections and left and right upright sections spaced away from each other;a covering member formed of left and right resting pieces for resting an integrated circuit thereon; andan electrically conductive band-like lining sheet formed by laminating an electrically conductive thin layer onto at least one side of a transparent band-like sheet of a synthetic resin;said lining sheet being fixedly bonded at both side edges to the lower faces of said resting pieces.

Abstract: A current winding is connected between an electric current source and automotive lamps for generating a magnetomotive force in response to the amount of current flowing therethrough. A voltage winding is connected in parallel with the combination of the current winding and the automotive lamps for generating an opposite magnetomotive force to that of the current winding. A reed switch is disposed adjacent the current and the voltage windings and is energized to close or open by the net magnetomotive force of the two windings. An indicating lamp is operatively related to the reed switch so as to be energized when the net magnetomotive force becomes lower than a predetermined value because of the interruption in operation of at least one of the lamps. A zener diode is further connected in series with the voltage winding in order to enable indication of the interruption when all of the automotive lamps are inoperative.