Solvent compositions comprising unsaturated fluorinated hydrocarbons
This invention relates to cleaning compositions comprising unsaturated fluorinated hydrocarbons. The invention further relates to use of said cleaning compositions in methods to clean, degrease, deflux, dewater, and deposit fluorolubricant. The invention further relates to novel unsaturated fluorinated hydrocarbons and their use as cleaning compositions and in the methods listed above.
1. A solvent composition consisting essentially of at least one unsaturated fluorinated hydrocarbon having the formula CF 3 CF 2 CH═CFCF 2 CF 2 CF 3 , CF 3 CF 2 CF═CHCF 2 CF 2 CF 3 or mixtures thereof, and an aerosol propellant.
2. A solvent composition consisting essentially of at least one unsaturated fluorinated hydrocarbon having the formula CF 3 CF 2 CH═CFCF 2 CF 2 CF 3 , CF 3 CF 2 CF═CHCF 2 CF 2 CF 3 or mixtures thereof, and a surfactant.
3. A process for removing at least a portion of water from the surface of a wetted substrate, said process comprising:
a) contacting the substrate with the composition of claim 2 , and then
b) removing the substrate from contact with said composition.
4. A method for removing residue from a surface comprising:
(a) contacting the surface with a composition consisting essentially of at least one unsaturated fluorinated hydrocarbon having the formula CF 3 CF 2 CH═CFCF 2 CF 2 CF 3 , CF 3 CF 2 CF═CHCF 2 CF 2 CF 3 or mixtures thereof, and
(b) recovering the surface from the composition.
5. The method of claim 4 wherein said composition further consists essentially of an aerosol propellant.
6. The method of claim 4 wherein said composition further consists essentially of a surfactant.
7. The method of claim 4 wherein said composition further consists essentially of a co-solvent.
8. The method of claim 4 , wherein the contacting is accomplished by vapor degreasing.
9. The method of claim 8 , wherein the vapor degreasing is performed by:
(i) boiling the composition; and
(ii) exposing the article to vapors of the boiling cleaning composition.
10. The method of claim 4 , wherein the contacting is accomplished by wiping the article with an object soaked in the composition.
11. A method for depositing a fluorolubricant on a surface comprising:
(a) combining a fluorolubricant and a solvent, said solvent comprising an unsaturated fluorinated hydrocarbon having the formula CF 3 CF 2 CH═CFCF 2 CF 2 CF 3 or CF 3 CF 2 CF═CHCF 2 CF 2 CF 3 or mixtures thereof;
to form a lubricant-solvent combination;
(b) contacting the combination of lubricant-solvent with the surface; and
(c) evaporating the solvent from the surface to form a fluorolubricant coating on the surface.
12. The method of claim 11 , wherein the surface is that of a semiconductor material, metal, metal oxide, vapor deposited carbon, or glass.
13. The method of claim 11 , wherein the surface is that of a magnetic medium.
14. The method of claim 13 , wherein the magnetic medium is a computer disk.
15. The method of claim 11 , wherein the contacting step is accomplished by dipping or immersing the surface in a bath comprising the fluorolubricant.
16. The method of claim 11 , wherein the contacting step is accomplished by spraying or spin coating the surface with the fluorolubricant.
17. The method of claim 11 , wherein the fluorolubricant concentration in the lubricant-solvent combination is from about 0.02 weight percent to about 0.5 weight percent.
18. The method of claim 11 , wherein the evaporating step is accomplished at a temperature of from about 10° C. to about 40° C.
19. The method of claim 11 , wherein the fluorolubricant comprises a perfluoropolyether.
20. The method of claim 11 , wherein the fluorolubricant is selected from the group consisting of perfluoropolyethers and mixtures thereof.