Process for making CNT/PFA composite coatings for fuser applications
First Claim
1. A method for making a coated article comprising:
- providing a substrate and a coating composition;
andforming a coated layer by applying the coating composition to the substrate,wherein the coating composition is prepared by a method comprising;
forming a stabilizer solution having a pH value of about 8 to about 9, the stabilizer solution comprising partially neutralized polyallylamine having a molecular weight ranging from about 300 to about 100,000 and a dual amino structure functionality, wherein the partially neutralized polyallylamine comprises neutralized amino groups and ammonium salts;
providing a fluoropolymer suspension comprising polyfluoroalkoxypolytetrafluoroethylene; and
mixing a plurality of nanotubes in a media with the stabilizer solution and the fluoropolymer suspension to form a coating composition, wherein the coating composition comprises from about 0.1 to about 10% by weight of the partially neutralized polyallylamine, and whereby the stabilizer solution allows a stable dispersion of the plurality of nanotubes in the media and in the fluoropolymer drying the coated layer wherein the dried coated layer has a thickness of about 5 micrometers to about 20 micrometers.
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Abstract
Exemplary embodiments provide nanotube-containing coating compositions and methods for making and using the coating compositions. In an exemplary embodiment, the coating composition can include a plurality of nanotubes (e.g., carbon nanotubes (CNTs)) dispersed stably and uniformly in a polymer matrix containing fluoropolymers. The coating composition can further include stabilizers to allow a stable and/or uniform dispersion of the plurality of nanotubes in the fluoropolymers. The nanotube coating composition can be coated on an article surface to improve mechanical robustness, and electrical and thermal conductivity of the coated article. The coated article can be used as a fuser member, a fixing member, a pressure roller, or a release agent donor member in an electrostatographic printing machine or process.
15 Citations
19 Claims
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1. A method for making a coated article comprising:
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providing a substrate and a coating composition; and forming a coated layer by applying the coating composition to the substrate, wherein the coating composition is prepared by a method comprising; forming a stabilizer solution having a pH value of about 8 to about 9, the stabilizer solution comprising partially neutralized polyallylamine having a molecular weight ranging from about 300 to about 100,000 and a dual amino structure functionality, wherein the partially neutralized polyallylamine comprises neutralized amino groups and ammonium salts; providing a fluoropolymer suspension comprising polyfluoroalkoxypolytetrafluoroethylene; and mixing a plurality of nanotubes in a media with the stabilizer solution and the fluoropolymer suspension to form a coating composition, wherein the coating composition comprises from about 0.1 to about 10% by weight of the partially neutralized polyallylamine, and whereby the stabilizer solution allows a stable dispersion of the plurality of nanotubes in the media and in the fluoropolymer drying the coated layer wherein the dried coated layer has a thickness of about 5 micrometers to about 20 micrometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification