Burnishing tape and method of manufacturing the same, and method of burnishing magnetic disk

Abstract

Disclosed is a burnishing tape, a method of producing the same and a method of burnishing a magnetic disk with which a surface of the magnetic disk may be smoothed while contamination of a magnetic disk caused by crushed abrasive grains is prevented. A burnishing tape ( 1 ) manufactured by the method of manufacturing of the burnishing tape according to an embodiment of the invention is used to burnish the magnetic disk. The method includes: kneading and dispersing abrasive grains ( 5 ) and a binder ( 6 ) to prepare slurry; applying the slurry on the support ( 2 ) to form a coating layer; curing the coating layer to form an abrasive grain layer ( 3 ); and forming a liquid lubricant layer ( 4 ) on a surface of the abrasive grain layer ( 3 ).

1 . A burnishing tape used to burnish a magnetic disk, the tape comprising:
 a support;   an abrasive grain layer, which comprises abrasive grains and is provided on the support; and   a liquid lubricant layer with which a surface of the abrasive grain layer is coated.   
   
   
       2 . The burnishing tape according to  claim 1 , wherein the thickness of the liquid lubricant layer is in a range of 0.0001 to 10 micrometers. 
   
   
       3 . The burnishing tape according to  claim 1 , wherein the liquid lubricant layer comprises a compound which has a perfluoropolyether structure. 
   
   
       4 . The burnishing tape according to  claim 2 , wherein the liquid lubricant layer comprises a compound which has a perfluoropolyether structure. 
   
   
       5 . A method of manufacturing of a burnishing tape used to burnish a magnetic disk, the method comprising:
 kneading and dispersing abrasive grains and a binder to prepare a slurry;   applying the slurry on a support to form a coating layer;   curing the coating layer to form an abrasive grain layer; and   forming a liquid lubricant layer on a surface of the abrasive grain layer.   
   
   
       6 . The method of manufacturing of the burnishing tape according to  claim 5 , wherein the thickness of the liquid lubricant layer is in a range of 0.0001 to 10 micrometers. 
   
   
       7 . The method of manufacturing the burnishing tape according to  claim 5 , wherein the liquid lubricant layer comprises a compound which has a perfluoropolyether structure. 
   
   
       8 . The method of manufacturing the burnishing tape according to  claim 6 , wherein the liquid lubricant layer comprises a compound which has a perfluoropolyether structure. 
   
   
       9 . A method of burnishing a magnetic disk, which comprises a step of polishing a surface of a magnetic disk comprising at least an underlayer, a magnetic layer and a protective layer on a nonmagnetic substrate, after pressing an abrasive grain surface of a burnishing tape supplied to the magnetic disk surface, while the magnetic disk is rotated,
 wherein the burnishing tape supplied to the magnetic disk surface is the burnishing tape according to  claim 1 .   
   
   
       10 . A method of burnishing a magnetic disk, which comprises a step of polishing a surface of a magnetic disk comprising at least an underlayer, a magnetic layer and a protective layer on a nonmagnetic substrate, after pressing an abrasive grain surface of a burnishing tape supplied to the magnetic disk surface, while the magnetic disk is rotated,
 wherein the burnishing tape supplied to the magnetic disk surface is the burnishing tape according to  claim 2 .   
   
   
       11 . A method of burnishing a magnetic disk, which comprises a step of polishing a surface of a magnetic disk comprising at least an underlayer, a magnetic layer and a protective layer on a nonmagnetic substrate, after pressing an abrasive grain surface of a burnishing tape supplied to the magnetic disk surface, while the magnetic disk is rotated,
 wherein the burnishing tape supplied to the magnetic disk surface is the burnishing tape according to  claim 3 .   
   
   
       12 . A method of burnishing a magnetic disk, which comprises a step of polishing a surface of a magnetic disk comprising at least an underlayer, a magnetic layer and a protective layer on a nonmagnetic substrate, after pressing an abrasive grain surface of a burnishing tape supplied to the magnetic disk surface, while the magnetic disk is rotated,
 wherein:   the burnishing tape supplied to the magnetic disk surface comprises a support and an abrasive grain layer which contains abrasive grains and is provided on the support; and   a liquid lubricant is supplied between the support and the abrasive grain layer when the magnetic disk surface is polished by the burnishing tape.