Magnetic recording medium
AssigneeKabushiki Kaisha Toshiba
InventorsAkio Ishizawa, Toshio Hukaya, Katuya Kumagai, Tatuo Takeuchi
Life of this patent
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Abstract
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.
Claims5
A magnetic recording medium which comprises (i) magnetic particles;
- (ii) a phosphate represented by the formula:
- ##STR5## wherein R.sup.1, R.sup.2 and R.sup.3 may be the same or different and each is represented by the formula 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 by the formula HO--, with the proviso that at least one of R.sup.1, R.sup.2 and R.sup.3 is represented by said formula R.sup.4 O--CH.sub.2 CH.sub.2 O--.sub.n ;
- (iii) a lecithin;
- and (iv) a binder, wherein the weight mixing ratio of said phosphate and said lecithin ranges from about 5:1 to about 1:1.
Dependencies are inferred from the claim text.