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Surface treatment
| Details |
Inventors: McClain, James B.; Romack, Timothy J.; DeYoung, James P.;
Assignee: MiCell Technologies (Raleigh, NC)
Primary Examiner: Cameron; Erma
Assistant Examiner:
Attorney, Agent or Firm: Myers Bigel Sibley & Sajovec
A method of treating a substrate comprises contacting a surface of said substrate, with a pressurized fluid comprising carbon dioxide and a surface treatment component, the surface treatment component being entrained in the pressurized fluid and contacting the surface so that the surface treatment component lowers the surface tension of the surface of the substrate and treats the substrate. The contacting step is preferably carried out by immersion, the fluid is preferably a liquid or supercritical fluid, the substrate is preferably a metal or fabric substrate, and the surface treatment component is preferably a fluoroacrylate polymer. |
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DETAILED DESCRIPTION OF THE INVENTION The invention will now be further described by the preferred embodiments presented herein.
It should be understood however that the embodiments are to be interpreted as being illustrative of the invention and not as limiting the invention.
The invention relates to a method of treating a substrate in a pressurized system.
The method includes the step of contacting a surface of the substrate with a fluid comprising carbon dioxide and a surface treatment component.
The surface treatment component is entrained in the fluid and contacts the surface so that the surface treatment component lowers the surface tension of the substrate.
In this instance, the "entrainment of the surface treatment component in the fluid" refers to a surface treatment component which may be solubilized, dissolved, emulsified, or dispersed in the bulk fluid during transport of the fluid to the substrate surface and also upon the interaction of the fluid with the substrate surface.
Entrainment may also include surface treatment components which are insoluble in the carbon dioxide containing fluid but which may be physically dispersed in the fluid with or without the aid or a dispersing agent or the like.
For the purposes of the invention, the term "lowers the surface tension" can be understood as reducing the surface tension of the substrate to the extent such that in end use commercial applications contaminant materials (aqueous, organics, solids, liquids, etc.
) exhibit a reduced tendency to adhere or absorb onto the substrate surface.
For illustrative purposes, the invention is to be differentiated from processes in which surface treatments are applied in a transient manner for treating materials.
Such an instance involves sizing of textile yarns as set forth in Bowman et al.
, Textile Res.
J.
66 (12), 795-802 (1996), in which coating materials are applied to the yarns and then removed.
In contrast to the claimed invention, properties imparted by the sizing would render the substrate unusable
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