Article with lubricated surface and method
A method for preparing one or more lubricated surfaces of an article to reduce the break-out force and sliding frictional force. A lubricant is applied to one or more surfaces, and the lubricant-coated surface is treated by exposing the surface to an energy source, wherein the energy source is an ionizing gas plasma at about atmospheric pressure, gamma radiation, or electron beam radiation. One or more of the surfaces may be exposed to the ionizing gas plasma at about atmospheric pressure prior to application of the lubricant. Another aspect of the invention is articles produced using one or more methods of the invention.
1. An article having reduced break-out force and reduced sliding frictional force comprising one or more surfaces and a lubricant applied to at least one of the surfaces, the lubricant including a fluorochemical compound selected from the group consisting of a perfluoropolyether, a functionalized perfluoropolyether, and mixtures thereof, the lubricant-coated surface subsequently exposed to an energy source at about atmospheric pressure, wherein the energy source is ionizing radiation.
2. The article of claim 1 wherein the lubricant is mixed with a solvent to form a lubricant-solvent solution prior to applying the lubricant to the surface.
3. The article of claim 2 wherein the coated surface is heated, the heating step occurring after applying the lubricant-solvent solution to the surface and prior to exposing the coated surface to the energy source.
4. The article of claim 1 wherein the lubricant contains additives selected from one or more groups comprising free radical initiators, viscosity modifiers, surfactants, wetting agents, anticorrosive agents, antioxidants, antiwear agents, buffering agents, dyes and mixtures thereof.
5. The article of claim 1 wherein the energy source is an ionizing gas plasma at about atmospheric pressure.
6. The article of claim 5 wherein the gas is selected from one or more groups comprising helium, neon, argon, krypton, air, oxygen, carbon dioxide, carbon monoxide, water vapor, nitrogen, hydrogen and mixtures thereof.
7. The article of claim 5 , wherein the surface is additionally exposed to the ionizing gas plasma prior to applying the lubricant.
8. The article of claim 5 , wherein the article is a syringe barrel, the syringe barrel including an inner surface coated with a perfluoropolyether and exposed to the ionizing gas plasma at about atmospheric pressure after being coated with the perfluoropolyether.
9. The article of claim 8 , wherein the inner surface is additionally exposed to the ionizing gas plasma prior to applying the perfluoropolyether.
10. The article of claim 9 , wherein the syringe barrel is a polypropylene syringe barrel.
11. The article of claim 9 , wherein the syringe barrel is a glass syringe barrel.
12. The article of claim 1 wherein the ionizing radiation is gamma radiation.
13. An article having reduced break-out force and reduced sliding frictional force comprising one or more surfaces, at least one of the surfaces exposed to an ionizing gas plasma at about atmospheric pressure and a lubricant applied to the plasma-treated surface to form a coated surface, the lubricant including a fluorochemical compound selected from the group consisting of a perfluoropolyether, a functionalized perfluoropolyether, and mixtures thereof.
14. The article of claim 13 wherein the gas is selected from one or more groups comprising helium, neon, argon, krypton, air, oxygen, carbon dioxide, carbon monoxide, water vapor, nitrogen, hydrogen and mixtures thereof.
15. The article of claim 13 wherein the lubricant is mixed with a solvent to form a lubricant-solvent solution prior to applying the lubricant to the surface.
16. The article of claim 13 wherein the coated surface is heated, the heating step occurring after applying the lubricant to the surface.
17. The article of claim 13 wherein the lubricant contains additives selected from one or more groups comprising free radical initiators, viscosity modifiers, surfactants, wetting agents, anticorrosive agents, antioxidants, antiwear agents, buffering agents, dyes and mixtures thereof.
18. The article of claim 13 , wherein the article is a syringe barrel, and the coated surface is an inner surface of the syringe barrel.
19. The article of claim 13 , wherein the article is a glass syringe barrel, and the coated surface is an inner surface of the glass syringe barrel.
20. An article having reduced break-out force and reduced sliding frictional force comprising one or more surfaces, at least one of the surfaces exposed to a first ionizing gas plasma at about atmospheric pressure and a lubricant applied to the plasma-treated surface to form a coated surface, the lubricant including a fluorochemical compound selected from the group consisting of a perfluoropolyether, a functionalized perfluoropolyether, and mixtures thereof, wherein the coated surface is subsequently exposed to a second ionizing gas plasma at about atmospheric pressure.
21. The article of claim 20 , wherein the first and second ionizing gas plasmas are essentially the same.