Claims
- 1. A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer containing a ferromagnetic powder, a branched chain fatty acid, a branched chain fatty acid ester and a binder,
- said ferromagnetic powder being a ferromagnetic metal powder, and the branched chain fatty acid contained in the magnetic layer consists essentially of compounds represented by formula (I):
- R.sub.2 (CH.sub.2).sub.m COOH (I)
- wherein R represents CH.sub.3 (CH.sub.2).sub.n, n represents an integer of 8 or more, and m represents 0 or 1 in an amount of from 0.5 to 3 parts by weight per 100 parts by weight of said ferromagnetic metal powder,
- said branched chain fatty acid is selected from the group consisting of a branched chain fatty acid represented by formula (I) wherein m is 1 and n is 8 or 10, and a branched chain fatty acid represented by formula (I) wherein m is 0 and n is 9, 11 or 14.
- 2. A magnetic recording medium as in claim 1, wherein the branched chain fatty acid ester has a melting point of 20.degree. C. or less.
- 3. A magnetic recording medium as in claim 1, wherein the center line average surface roughness (Ra) of said magnetic layer is 15 nm or less.
- 4. A magnetic recording medium as in claim 1, wherein said binder contains a polar group in an amount of from 1.times.10.sup.-3 to 1.times.10.sup.-7 equivalent per g of binder.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-255229 |
Sep 1990 |
JPX |
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Parent Case Info
This is a continuation of application No. 07/765,229 filed Sep. 25, 1991.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4283314 |
Zeilstra et al. |
Aug 1981 |
|
4420540 |
Ogawa et al. |
Dec 1983 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
765229 |
Sep 1991 |
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