Kao Corporation

Kao Soap Company, Ltd.

Tetsuya Imamura

Nobuyuki Kishine

Michihide Yamauchi

Takashi Takeuchi

Takashi Hiraide

Tsuyoshi Ootani

Megumu Hirakura

Shinichiro Yasuda

Hiroshi Mizutani

Haruhiko Arai

Shigetoshi Suzue

Hiroyuki Kanai

Masanobu Wakasa

Fumikatsu Tokiwa

Toshiro Sakurada

Takeshi Takeuchi

Hideyuki Minami

Ryozi Shiozaki

Ryoji Shiozaki

Takashi Tetsutani

Syoji Kobayashi

This invention provides an inexpensive structure for a protecting jacket for rotatable magnetic recording media which has a dimension sufficient to cover openings on the jacket and is provided as a sheet adhered to the jacket to cover said openings and prevent entry of dust.

Protective structure for jacket for rotatable magnetic recording media

The present invention concerns a glass-like carbon material which may be bonded to other materials, the carbon material having a high thermal expansion coefficient and being highly applicable for use as a slider part for a recording medium.

Glass-like carbon material, method for manufacturing the same, and

A substrate for magnetic discs, which are to be used as external storage in data processors, is formed from glass-like carbon materials by themselves or contained in a thermosetting resin matrix. The glass-like carbon materials have excellent thermal resistance, can be finished to a mirror-like surface, and have less surface defects than aluminum substrates. Magnetic materials can be adhered directly onto the surface of such substrates shaped in the form of a disc. The resulting disc has good hardness, is resistant to elevated temperatures, is less likely to deform, and is low in cost.

Substrate for a magnetic disc and method manufacturing same

A magnetic recording medium having improved lubricity and durability properties which comprises a magnetic powder, a resin binder and an ester compound of the formula (1): ##STR1## in which R1 and R2 are each a straight or branched, saturated alkyl having 1 to 25 carbon atoms and R3 is an unsaturated hydrocarbon group or a straight or branched, saturated alkyl and has 7 to 27 carbon atoms, provided that the total carbon atom number of R1 and R2 ranges from 18 to 32 when R3 is the unsaturated hydrocarbon group and that ranges from 22 to 32 when R3 is the saturated alkyl. It is improved in lubricity and durability.

Magnetic recording medium

A magnetic recording medium exhibiting reduced abrasion and improved lubricant properties comprising a non-magnetic substrate having a magnetic layer containing a magnetic powder thereon, the magnetic layer including a glasslike carbon powder having an average particle diameter of from 0.1 to 2.0 .mu.m present in an amount of from 0.5 to 15 parts by weight per 100 parts by weight of the magnetic powder.

A magnetic head for recording and reading out of a magnetic recording medium in a perpendicular magnetic recording system is described in which the surface which is close to or in contact with the recording medium are covered with a film of a glasslike carbon material. This film improves the lubrication properties with respect to the adjacent recording medium and serves to prevent abrasion.

Magnetic head for a perpendicular magnetic recording system

A magnetic head is disclosed in which a non-magnetic base substance which supports a writing or reading converter for writing or reading on a magnetic recording medium is constructed with an aggregate of carbon material, or a composite material comprising an aggregate of carbon material, and a thermosetting resin and/or a carbonaceous filler.

Magnetic head comprised of an improved base substance for high density

A magnetic toner comprises magnetic powder and a coating layer to cover said powder, the layer being a reaction product between (1) a silane coupling agent containing an amino group, an isocyanate group or an epoxy group and (2) one or more compounds having a functional group reactive with one of the reactive group on the silane coupling agent. A compound having a carboxyl group, an acid anhydride, an isocyanate compound or a ketene dimer is used for the amino group. A compound having a hydroxyl group, an amine compound or a compound having a carboxyl group is used for the isocyanate group. A compound having a hydroxyl group, a compound having a carboxyl group or a copolymer of a di- or monoalkylamino-alkyl (meth)acrylate and a hydrophobic vinyl monomer is used for the epoxy group. The magnetic toner is improved about dispersibility in a binder.

Coated magnetic toner powder

Magnetic recording particles (i) are coated with a reaction product of (ii) an isocyanate compound such as polyisocyanate compounds and isocyanate compounds having a hydrolyzable alkoxysilane group, and (iii) a phosphoric ester of an alkanol, alkenol, alkylene oxide additives thereof or aliphatic carboxylic alkylene oxides.

Liquid abrasive-containing cleanser composition

A weakly acidic or acidic liquid detergent composition comprising a water-soluble solvent, an anionic and/or nonionic surfactant, an acidic substance or a mixture of acidic substance and water-soluble salt thereof, wherein said water-soluble solvent has the formula

Acidic liquid detergent composition for cleaning hard surfaces

A liquid detergent composition comprising 0.5 to 30% by weight of at least one alkanolamine represented by the following general formula (1):

Liquid detergent compositions containing alkanolamines and

A soap for a scouring pad comprising a partially neutralized alkali metal salt of a fatty acid, said fatty acid having an average carbon atom number of 16 to 20 and an iodine value of 30 to 45, the degree of neutralization of the fatty acid with the alkali metal being from 85 to 98% by weight.

Soap for scouring pad

A scouring pad comprising a fine metal wire pad and a detergent adhered thereto, wherein the detergent comprises a salt of an ester of phosphoric acid having the formula (I):

Scouring pad containing phosphoric acid ester-fatty acid soap mixtures

A detergent composition comprising as essential components (A) 5 - 50 parts by weight of a surfactant component consisting of a mixture of (1) 5 - 95% by weight of a water-soluble polyoxyethylene sorbitan fatty acid monoester and (2) 95 - 5% by weight of a fatty acid alkylolamide, and (B) 1 - 50 parts by weight of an organic acid salt having a chelating ability.

Growing community of inventors

Tokyo, Japan

Tetsuya Imamura