| 摘要 |
A magnetic recording medium with a greatly reduced coefficient of friction comprising a non-magnetic support having thereon a magnetic recording layer comprising finely divided ferromagnetic powders in a binder, wherein (1) AT LEAST ONE ALKYLPOLYSILOXANE HAVING A HYDROPHILIC GROUP IN THE SIDE CHAIN THEREOF AND REPRESENTED BY THE FORMULA (I) <IMAGE> wherein R1 and R2, which may be the same or different, each represents <IMAGE> provided that R1 and R2 are not simultaneously -CH3; R3 represents -CH3 or the aliphatic chain having 10 to 18 carbon atoms of a saturated or unsaturated fatty acid; R4 represents -H or -CH3; Z represents an ionic group, which renders the alkylpolysiloxane water-soluble, selected from the group consisting of -OSO3Na, -COOR5 wherein R5 is H, Na or K, and <IMAGE> X REPRESENTS A NUMBER OF FROM 3 TO 50; Y REPRESENTS A NUMBER OF FROM 2 TO 50; Z REPRESENTS 0 OR A NUMBER OF FROM 1 TO 10; X+Y+Z IS A NUMBER OF FROM 5 TO 100; N IS 0 OR A NUMBER OF FROM 1 TO 5; P IS 0 OR A NUMBER OF FROM 1 TO 50; AND Q IS 0 OR A NUMBER OF FROM 1 TO 50; IS PRESENT IN THE MAGNETIC RECORDING LAYER IN AN AMOUNT OF ABOUT 5 WT% OR LESS BASED ON THE WEIGHT OF THE FERROMAGNETIC POWDERS AND (2) THE MAGNETIC LAYER HAS A Young's modulus of at least 1x1010 dyne/cm2.
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