Solubility of perfluorinated polyethers in fluorinated solvents
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorJohn Martin Burns
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Abstract
Methods of improving the solubility of highly functionalized polar perfluorinated polyethers in fluorinated solvents are described. In preferred embodiments, the ratio of solubilizer to fluorinated solvent is the azeotropic ratio. The solubilizer can be an alcohol or cyclic ether. The methods finds utility in hard disc drive applications, where perfluorinated polyethers are used as lubricants. Compositions are also provided.
Claims9
A method of improving the solubility of perfluorinated polyethers in fluorinated solvents, comprising combining a perfluorinated polyether with a solubilizer and a fluorinated solvent to form a solution, wherein the solubilizer is selected from the group consisting of tetrahydrofuran, 2-methyl-tetrahydrofuran, tetrahydropyran, and dioxane, and wherein the solution comprises about 0.001–1 parts by weight of perfluorinated polyether to about 99–99.999 parts by weight of the solvent and solubilizer combined, and further wherein the weight ratio of solubilizer to fluorinated solvent is either about the azeotropic ratio or within the range of about 2:98 to 10:90, or is both about the azeotropic ratio and within the range of about 2:98 to 10:90.
A method of dissolving a perfluorinated polyether for use in hard disk drive applications, comprising:
- (a) providing a fluorinated solvent;
- and
- (b) adding a solubilizer and a perfluorinated polyether to the solvent;
- wherein the solubilizer is a cyclic ether selected from the group consisting of tetrahydrofuran, 2-methyl-tetrahydrofuran, tetrahydropyran, and dioxane, and wherein the solution comprises about 0.001–1 parts by weight of perfluorinated polyether to about 99–99.999 parts by weight of the solvent and solubilizer combined, and further wherein the weight ratio of solubilizer to fluorinated solvent is either within the range of about 2:98 to 10:90 or is about the azeotropic ratio, or is both about the azeotropic ratio and within the range of about 2:98 to 10:90.
Dependencies are inferred from the claim text.