Protecting carbon steel from corrosion with nonconducting poly(aniline)
September 29, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesElectrochemistry employing polyaniline Conductive polymer-polyimide blends and method for producing same Solution processible forms of electrically conductive polyaniline and the method of manufacture of electroconductive articles therefrom Electrically conductive polymer material having conductivity gradient Method for enhancing polyaniline conductivity Process for forming conjugated backbone block copolymers Electromagnetic radiation absorbers and modulators comprising polyaniline Patent #: 5294694 InventorsAssigneeApplicationNo. 129699 filed on 09/29/1993US Classes:427/388.1, Metal base427/386, Epoxy or polyepoxide containing coating427/388.2Cross-linked or infusible coatingExaminersPrimary: Dudash, DianaAttorney, Agent or FirmInternational ClassB05D 007/14AbstractCarbon steel substrates are protected from corrosive environments by a coating of nonconductive poly(aniline) which has been chemically prepared and cast onto the substrate from solution. The coating can also include other polymers which are miscible with the poly(aniline) but do not protonate it so as to make it conductive. Such polymers can include polyimides, epoxies, and urethane linked diisocyanates, among others. In these blends, a weight composition of at least 5% poly(aniline) to the other polymer is preferred. Overall, the nonconductive form of polyaniline has been found to be more effective in this service than the conductive form. Air oxidation of the poly(aniline) coating before exposure to a corrosive environment enhances the benefits.Other References
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