SU832591A1 - Magnetic record carrier working layer - Google Patents

Description

(; 54) WORKING LAYER OF THE CARRIER OF MAGNETIC RECORD

one

The invention relates to magnetic recording, in particular to magnetic recording media.

A working layer of the magnetic recording carrier is known, consisting of magnetic particles of gamma iron oxide distributed in binder 1 and 2. This working layer has a relatively high wear and tear resistance.

A disadvantage of the known working layer is the considerable uneven distribution of the magnetic particles of iron gamma oxide in it.

Also known is the working layer of the magnetic recording medium, consisting of magnetic particles of gamma iron oxide distributed in a copolymer of vinyl chloride with vinylidene chloride, oleic acid, surfactant, toluene, butyl acetate and cyclohexanone 3. This working layer is characterized by a relatively high uniformity of distribution in it are magnetic particles of gamma-iron oxide.

The disadvantage of the known working layer is low sensitivity.

 The purpose of the invention is to increase the sensitivity of the working layer of the magnetic recording carrier.

The goal is achieved by the fact that the working layer

magnetic recording medium contains dodecylbenzene sulfonic acid of general formula as a surfactant

СНз - (- СНг -), 1-О-SOaH

in the following ratio of components: 30,0-35,0 weight. % of magnetic particles of gamma iron; 8.0 to 9.5% by weight of a copolymer of vinyl chloride with vinylidene chloride; 3.0-6.0% by weight oleic acid; 2.5 to 15.0 w / v dodecylbenzenesulfonic acid; 27.0-29.5 wt.% Toluene; 8.0-9.0 weight. butyl acetate and 8.0-9.0 weight. cyclohexanone.

Claims (3)

The working layer is a thin film fixed on a non-magnetic base of the magnetic recording medium and consists of magnetic particles of gamma-iron oxide uniformly distributed in the copolymer of vinyl chloride with vinylidene chloride, oleic acid, surfactant, toluene, butyl acetate, and cyclohexanone. As a surfactant, the working layer contains dodecylbenzenesulfonic acid of the general formula SS - (- CHi -), -, - -Zp3N. In this case, the proposed working layer may, for example, contain 35.0 wt. / Omagnetic particles of gamma-iron oxide; 9.5 wt. % copenera vinyl chloride with vinylidene chloride; 6.0 wt./s, ohsichova. acids; 2.5 wt./about dodecylbenzene sulfonic acid; 29.0 wt.% Toluene; 9.0 weight. / o butylacetate and 9.0 cyclohexanone. The working layer during its movement relative to the recording head in the recording process is magnetized in accordance with the recorded signal. In the process of reproduction, the proposed working layer provides an effect on the reproducing head by the magnetic field created by the result of the recording. The present invention allows a significant increase in the sensitivity of the working layer of the magnetic recording medium, as well as reducing the copy effect, and also accelerates the manufacturing process of the working layer of the magnetic recording carrier. Claims A magnetic carrier working layer consisting of gamma iron oxide magnetic particles distributed in a copolymer of vinyl chloride with vinylidene chloride, oleic acid, a surfactant, toluene, butyl acetate and cyclohexanone, characterized in that in order to increase the sensitivity of the working layer , it contains as a surfactant dodecylbenzenesulfonic acid of the general formula CH3 - (- CHi) it-CI-SOaH in the following ratio of components, weight. %; Magnetic particles of gamma-oxidic iron 30.0-, 0 Vinyl chloride copolymer with vinylidene chloride 8.0-9, о Oleic acid 3,, 0 Dodecylbenzenesulfonic acid 2.5-15.0 Toluene 27.0-29.5 Butylacetate 8.0-9.0 Cyclohexanone 8.0-9 Sources of information taken into account in the examination 1. Japanese Patent No. 47-18572, cl. 102 E PO, 1972. 2. Japanese Patent No. 48-15005, cl. 102 E 110.11, 1973. 3. Japanese patent number 48-7443, cl. 102 E 110.11, 1973 (prototype)