发明授权
- 专利标题: Magnetic recording medium
- 专利标题(中): 磁记录介质
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申请号: US922413申请日: 1978-07-06
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公开(公告)号: US4171406A公开(公告)日: 1979-10-16
- 发明人: Nobutaka Yamaguchi , Masahiro Utumi , Masaaki Fujiyama , Masakazu Yoneyama
- 申请人: Nobutaka Yamaguchi , Masahiro Utumi , Masaaki Fujiyama , Masakazu Yoneyama
- 申请人地址: JPX Minami-ashigara
- 专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人地址: JPX Minami-ashigara
- 优先权: JPX52-80780 19770706
- 主分类号: G11B5/71
- IPC分类号: G11B5/71 ; C09D5/23 ; C09D7/12 ; G11B5/702 ; H01F10/02
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) ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents ##STR2## provided that R.sub.1 and R.sub.2 are not simultaneously --CH.sub.3 ; R.sub.3 represents --CH.sub.3 or the aliphatic chain having 10 to 18 carbon atoms of a saturated or unsaturated fatty acid; R.sub.4 represents --H or --CH.sub.3 ; Z represents an ionic group, which renders the alkylpolysiloxane water-soluble, selected from the group consisting of --OSO.sub.3 Na, --COOR.sub.5 wherein R.sub.5 is H, Na or K, and ##STR3## 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 1.times.10.sup.10 dyne/cm.sup.2.
公开/授权文献
- US5791028A Reciprocating hydroenhancement system 公开/授权日:1998-08-11
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