SU773710A1 - Magnetic record working layer binding substance - Google Patents

Description

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

A binder is known for the working layer of a magnetic recording medium containing a copolymer of vinyl chloride with vinyl acetate [1] and [2]. The known binding agent 5 provides a combination of the magnetic particles of the working layer of the magnetic recording medium uniformly distributed therein.

The disadvantage of the known binder consists in low elasticity working layer HO- ^'0 CITEL magnetic recording.

Also known is a binder of the working layer of the magnetic recording medium, consisting of polyurethane rubber, epoxy resin with a weight content of hydroxyl groups · ⁵

3-20% and with a molecular weight of 2000-5000, hexamethoxymethylmelamine and dodecylbenzene sulfonic acid [3]. This binder provides a relatively high elasticity of the working layer of the magnetic recording medium. ²⁰

The disadvantage of such a binder is that it does not provide high wear resistance of the magnetic recording medium.

The purpose of the invention is to increase the durability of the magnetic recording medium.

30-50

30-50

This goal is achieved by the fact that cellulose acetate butyrate is introduced into the binder of the working layer of the magnetic recording medium in the following ratio of components cet.%:. Polyurethane rubber

Cellulose Acetobutyrate Epoxy resin with a weight content of hydroxyl groups of 3-20% and a molecular weight of 2000-5000 Hexamethoxymethylmelamine Dodecylbenzenesulfonic acid

The proposed binder provides the connection of uniformly distributed magnetic particles in it in a working layer placed on a non-magnetic basis of the carrier magnet

5-20

6-15

2-5th record. The binder consists of polyurethane rubber, cellulose acetobourate, an epoxy resin with a weight content of hydroxyl groups of 3% and a molecular weight of 2000, hexamethoxymethylmelamine and dodecylbenzenemelamine. Moreover, the binder contains, wt.%: Polyurethane rubber 30 cellulose acetate butyrate 30, epoxy resin with a weight content of hydroxyl groups of 3% and a molecular weight of 2000 20, hexamethoxymethylmelamine 15 _L dodecylbenzenesulfo- ₅

k .. slot 5.

The proposed binder provides a strong adhesion of magnetic particles in the working layer and a strong connection of the latter with a non-magnetic base of the magnetic recording medium.

The use of the invention can significantly increase the wear resistance of the magnetic recording medium.

Claims (3)

The invention relates to magnetic recording, It specifically to magnetic recording media. The binder of the working layer of the magnetic recording carrier is known, which contains a copolymer of vinyl chloride with vinyl acetate 1 and (2. The known binder provides the connection of the magnetic particles of the working layer of the magnetic recording carrier uniformly distributed in it. A disadvantage of the known binder is the low elasticity of the working layer wear a magnetic tape. It is also known to be a binder of the working layer of a magnetic recording carrier consisting of polyurethane rubber, epoxy resin with a weight content hydroxyl groups of 3–20% and with a molecular weight of 2000–5000, hexamethoxymethyl melamine and dodecyl benzene sulfonic acid 3. This binder provides a relatively high elasticity of the working layer of the magnetic recording carrier. The disadvantage of this binder is that it does not provide high durability magnetic recording medium. The purpose of the invention is to increase the durability of the magnetic recording carrier. This goal is achieved by introducing into the bonding substance of the working layer of the magnetic recording carrier cellulose acetobutyrate next sootnoschenii components, wt.%:. Polyurethane rubber30-50 Cellulose acetobutyrate30-50 Epoxy resin with a weight content of hydroxyl groups of 3-20% and with a molecular weight of 2000-50005-20 Hexamethoxymethylmelamine 6-15 Dodecylbenzenesulfonic acid 2-5 The proposed binder provides the connection of evenly distributed magnetic particles in it working layer, placed on a non-magnetic base magnetic recording media. The binder consists of polyurethane rubber, cellulose acetobugrate, an epoxy resin with a weight content of 3% and hydroxyl groups and a molecular weight of 2000, hexamethoxymethyl lamin, and dodecyl bepol melamine. At the same time, the binder includes, in wt.%: Polyurethane rubber 3 cellulose acetobutyrate 30, epoxy resin with a weight content of 3% hydroxyl groups and molecular weight 2000 20, hexamethoxymethyl melamine 15 dodecyl benzene sulfonic chlorine 5, Proposed binder provides strong adhesion magnetic particles in the working layer and a strong connection of the latter with a non-magnetic carrier of the magnetic recording medium. The use of the invention significantly improves the durability of the magnetic recording medium. The invention Binder of the working layer of the magnetic recording carrier, consisting of polyurethane rubber, epoxy resin with a weight content of hydroxyl groups of 3-20% and with a molecular weight of 2000-5000, hexamethoxymethylmelamine and dodecylbenzenesulfonic acid, improve the durability of the magnetic recording medium; cellulose ad-butobutyrate is added to it in the following ratio of components, weight. Polyurethane rubber30-50 Cellulose acetobutyrate30-50 Epoxy resin with a weight content of 2–20% purity of oxides and molecular weight 2000-50005-20 Hexamethoxymethylmelamine 6-15 Dodecylbenzenesulfonic acid 2-5 Sources of information taken into account during examination 1.Patent USA No. 3597273, cl. 117-235,1971 2. Authors certificate of the USSR N 529478, cl. G 11 B 5/68, 1975. 3. Author's testimony of the USSR N 633066, cl. G 11 B 5/68, 1977 (prototype).