Lubricant for thin film storage media

Abstract

Embodiments relate to lubricants disposed over magnetic storage media, such as rotatable thin film magnetic discs. One embodiment comprises a lubricant compound of a fluoropolyether chain having one or more carbonyl-imide pairs. For example, the carbonyl-imide pair may be located at one end, both ends, and/or in the middle of the fluoropolyether chain.

1 . A lubricant compound, comprising: 
 a fluoropolyether chain; and    one or more carbonyl-imide pairs.    
     
     
         2 . The lubricant compound of  claim 1 , wherein the one or more carbonyl-imide pairs comprise a nitrogen of an imide group linked to an alpha position carbon of a carbonyl group.  
     
     
         3 . The lubricant compound of  claim 2 , wherein one carbonyl-imide pair is located at one end of the fluoropolyether chain.  
     
     
         4 . The lubricant compound of  claim 3 , wherein another carbonyl-imide pair is located at the other end of the fluoropolyether chain.  
     
     
         5 . The lubricant compound of  claim 2 , wherein at least one carbonyl-imide pair is located within the fluoropolyether chain.  
     
     
         6 . The lubricant compound of  claim 3 , wherein at least one carbonyl-imide pair is located within the fluoropolyether chain.  
     
     
         7 . The lubricant compound of  claim 2 , wherein each carbonyl-imide pairs is represented by the formula selected from the group including: 
 R 1 ═N—(CR 2 R 3 )—(CO)—, wherein R 1 , R 2 , and R 3  are the same or different and may be an alkyl, alkenyl, alkoxy, aryl, aryloxy, arlyalkyl, arlyalkenyl, amine, imine, aromatic, or hetero cyclic aromatic group;    R 4 ═N—(NR 5 )—(CO)—, wherein R 4  and R 5  are the same or different and may be an alkyl, alkenyl, alkoxy, aryl, aryloxy, arlyalkyl, arlyalkenyl, amine, imine, aromatic, or hetero cyclic aromatic group;    R 6 —N═(CR 7 )—(CO)—, wherein R 6  and R 7  are the same or different and may be an alkyl, alkenyl, alkoxy, aryl, aryloxy, arlyalkyl, arlyalkenyl, amine, imine, aromatic, or hetero cyclic aromatic group;    R 8 —N═N—(CO)—, wherein R 8  may be an alkyl, alkenyl, alkoxy, aryl, aryloxy, arlyalkyl, arlyalkenyl, amine, imine, aromatic, or hetero cyclic aromatic group; and    —(C═O)—R 21 ═N—R 22 —(C═O)—, wherein R 21  and R 22  are the same or different and may be an alkyl, alkenyl, alkoxy, aryl, aryloxy, arlyalkyl, arlyalkenyl, amine, imine, aromatic, or hetero cyclic aromatic group.    
     
     
         8 . The lubricant compound of  claim 7 , wherein each carbonyl-imide pair is selected from the group including 2-pyridinecarbonyl, 2-quinolinecarbonyl, 3-isoquinolinecarbonyl, 2-pyrimidinecarbonyl, 2-quinazolinecarbonyl, 4-quinazolinecarbonyl, 1-pyrazolecarbonyl, 1-benzopyrazolecarbonyl, 2-benzopyrazolecarbonyl, 2-imidazolecarbonyl, 2-benzimidazolecarbonyl, 2,6-pyridine-biscarbonyl, and derivatives thereof.  
     
     
         9 . A method of manufacturing a magnetic storage medium, comprising: 
 forming a protective overcoat over a magnetic layer of the magnetic storage medium; and    applying a lubricant topcoat over the protective overcoat, the lubricant topcoat comprising fluoropolyether having one or more carbonyl-imide pairs.    
     
     
         10 . The method of  claim 9 , wherein the fluoropolyether is fractionated prior to application over the protective overcoat.  
     
     
         11 . The method of  claim 9 , wherein the lubricant topcoat is post-treated after application over the protective overcoat.  
     
     
         12 . The method of  claim 9 , wherein the protective overcoat comprises carbon.  
     
     
         13 . The method of  claim 9 , wherein the fluoropolyether is prepared by reacting a fluoropolyether chain having one or more functionalized end-groups with a imine compound to form the one or more carbonyl-imide pairs, wherein the one or more carbonyl-imide pairs comprise a nitrogen of an imide group linked to an alpha position carbon of a carbonyl group.  
     
     
         14 . A magnetic storage medium, comprising: 
 a carbon-overcoated magnetic layer; and    a lubricant topcoat formed over the carbon-overcoated magnetic layer, the lubricant topcoat comprising fluoropolyether having one or more carbonyl-imide pairs.    
     
     
         15 . The magnetic storage medium of  claim 14 , wherein the lubricant topcoat is formed to a thickness between about 10 angstroms and about 30 angstroms.  
     
     
         16 . The magnetic storage medium of  claim 14 , wherein the average molecular weight of the fluoropolyether is between about 2,000 and about 6,000 Daltons.  
     
     
         17 . A magnetic storage medium, comprising: 
 a carbon-overcoated magnetic disc; and    a lubricant means for blocking catalytic metal sites, the lubricant means formed over the carbon-overcoated magnetic disc.    
     
     
         18 . The magnetic storage medium of  claim 17 , wherein the lubricant means comprises a composition of a single class of compounds.  
     
     
         19 . The magnetic storage medium of  claim 17 , wherein the lubricant means comprising a lubricating polymer backbone and a catalytic blocking functional group incorporated into the polymer backbone.  
     
     
         20 . The magnetic storage medium of  claim 17 , wherein the lubricant means is in a single phase.