Tokyo Shibaura Denki Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Akio Ishizawa

Toshihiko Oguchi

Minoru Hashimoto

Katuya Kumagai

Moriyasu Wada

Tadashi Ido

Hirotaka Yokoyama

Yoshinori Fujimori

Hiromi Yoshida

Shozo Hideyama

Yoshiyasu Koike

Tatuo Takeuchi

Toshio Hukaya

Disclosed is a magnetic recording medium which comprises magnetic particles; a phosphate represented by the formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 may be the same or different and each represent R.sup.4 O--CH.sub.2 O--.sub.n (wherein R.sup.4 is an alkyl group having 8 to 20 carbon atoms or an alkylphenyl group whose alkyl group moiety has 8 to 20 carbon atoms, and n is an integer of 2 to 10) or a group of HO--, with the proviso that at least one of R.sup.1, R.sup.2 and R.sup.3 is a group of R.sup.4 O--CH.sub.2 CH.sub.2 O--.sub.n (wherein R.sup.4 and n are as defined above); a lecithin; and a binder.

Magnetic recording medium

Disclosed is a magnetic recording medium which comprises; a substrate; a first magnetic layer applied on the surface of the substrate and having an easy axis of magnetization in the in-plane direction of the substrate; and a second magnetic layer applied on the surface of the first magnetic layer, formed of ferrite series powder represented by the formula;

Disclosed is a magnetic recording medium comprising substrate and a resinous composition containing magnetic particles of uniaxially-anisotropic hexagonal crystals having particle diameters of 0.01.about.0.3 .mu.m and coated on said substrate; the ratio of remanent magnetization to saturation magnetization on the magnetization curve corrected to demagnetizing field which is measured in a direction vertical to the surface of the recording medium, ranging from 0.3 to 0.7. This magnetic recording medium requires no orientation treatment for its production.

Magnetic recording media

A coated powder comprising a transition metal or compound thereof prepared by the process which comprises coating the surface of a powdered transition metal or compound there with a free radical polymerizable monomer having an e value of (-)0.8 to (+)0.8 and then subjecting the resulting coated powder to free-radical polymerization conditions.

Polymer coated transition metal powder as electrostatic image toner

Disclosed is a method of producing composite piezoelectric materials exhibiting a high flexibility and a high piezoelectric effect, comprising the steps of treating an inorganic dielectric material powder with a latex-containing dispersion so as to coat the surfaces of the powder particles with the rubber particles in a manner to provide encapsulated powder particles, kneading the encapsulated powder particles, shaping the kneaded mass, and polarizing the shaped mass.

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Tokyo, Japan

Akio Ishizawa