Fluorinated ketones as lubricant deposition solvents for magnetic media applications
Assignee3M Innovative Properties Company
InventorsMichael J. Parent, Jason M. Kehren, Richard M. Minday
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Abstract
A lubricant composition comprising a perfluoropolyether lubricant and fluorinated ketone solvent is described. The lubricant composition can be applied as a coating to a substrate such as magnetic media. After the coating dries, a thin uniform lubricant film covers the substrate surface. The fluorinated ketone solvent can solubilize a wide range of perfluoropolyether compounds but not potential contaminants such as water and hydrocarbons. Additionally, the solvent has low potential to adversely affect global warming.
Claims17
A lubricant composition comprising:
- (a) a perfluoropolyether lubricant in the range of about 10 to about 10,000 ppm based on the weight of the lubricant composition;
- and
- (b) a fluorinated ketone solvent in the range of about 90 to about 99.9 weight percent based on the weight of the lubricant composition.
A lubricant composition comprising:
- (a) about 10 to about 10,000 ppm perfluoropolyether lubricant based on the weight of the lubricant composition, wherein the perfluoropolyether lubricant comprises a perfluoropolyether compound represented by the formula:
- A[Brketopenst](CyF2y)O(C4F8O)k(C3F6O)m(C2F4O)n(CF2O)p(CzF2z)[Brketclosest]A′
- wherein:
- (i) y is an integer from 0 to about 20;
- (ii) z is an integer from 0 to about 20;
- (iii) k, m, n, and p are independent integers from 0 to about 200, wherein the sum of k, m, n, and p ranges from 2 to about 200;
- and
- (iv) the A and A′ end groups are independently selected monovalent organic moieties;
- and
- (b) about 90 to about 99.9 weight percent a fluorinated ketone solvent based on the weight of the lubricant composition, wherein the fluorinated ketone solvent has 5 to 10 carbon atoms, up to two hydrogen atoms, and up to two halogens selected from the group consisting of chlorine, bromine, iodine, and mixtures thereof.
Dependencies are inferred from the claim text.