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Magnetic recording medium
| Details |
Inventors: Matsuura, Takeshi; Watatani, Seiji;
Assignee: Hitachi Maxell, Ltd. (Osaka, JP)
Primary Examiner: Silverman; Stanley S.
Assistant Examiner:
Attorney, Agent or Firm: Birch, Stewart, Kolasch and Birch
A magnetic recording medium, prevented from blooming of the lubricants therein even after used at a high temperature under a high humidity for a long period of time and excellent in abrasion resistance and durability, comprising an elastic base sheet and a magnetic layer containing magnetic powders and a binder, characterized in that the magnetic layer further contains (A) at least one of esters of saturated aliphatic acids having 18 carbon atoms with aliphatic alcohols having 3 to 6 carbon atoms, (B) at least one of saturated aliphatic acids having 14 to 18 carbon atoms and (C) at least one of zinc salts of saturated aliphatic acids having 14 to 18 carbon atoms, the content of the component (A) being from 0.5 to 2.0% by weight based on the weight of the magnetic powders in the magnetic layer, the content of the component (B) being from 1/4 to 1 part by weight to one part by weight of the component (A) and the content of the component (C) being from 1/3 to 1 part by weight to one part by weight of the combined amount of the components (A) and (B). |
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DETAILED DESCRIPTION What is claimed is: 1.
A magnetic recording medium comprising an elastic base sheet and a magnetic layer containing magnetic powders and a synthetic resin binder provided on said base sheet, characterized in that the magnetic layer further contains (A) at least one ester of stearic acid and an aliphatic alcohol having 3 to 6 carbon atoms, (B) at least one saturated aliphatic acid having 14 to 18 carbon atoms and (C) at least one zinc salt of a saturated aliphatic acid having 14 to 18 carbon atoms, wherein the content of the component (A) is from 0.
5 to 2.
0% by weight based on the weight of the magnetic powders in the magnetic layer, the content of the component (B) is from 1/4 to 1 part by weight to 1 part of the component (A) and the content of the component (C) is from 1/3 to 1 part by weight to 1 part by weight of the combined amount of the components (A) and (B).
2.
The magnetic recording medium according to claim 1, wherein the component (A) is C.
sub.
3 -C.
sub.
6 alkyl stearate, the component (B) is myristic acid and the component (C) is zinc stearate.
3.
The magnetic recording medium according to claim 2, wherein the component (A) is butyl stearate.
Description:
The present invention relates to a magnetic recording medium.
More particularly, it relates to a magnetic recording medium, which eliminates the blooming of a lubricant even after being used at a high temperature under high humidity for a long period of time, having running stability and durability.
BACKGROUND OF THE INVENTION A magnetic recording medium for video, audio, computer use or the like travels slidably on a magnetic recording head on the recording and reproducing and therefore its magnetic layer is apt to be abraded.
Because of this reason, it is desirable for the magnetic layer of a magnetic recording medium to be excellent in abrasion resistance.
In the case of a magnetic recording tape for video use which slides on a magnetic recording head at a high speed it is particularly desirable for, its magnetic layer is particularly desired to have a high abrasion resistance at a high temperature because of the heat of friction produced on the sliding
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