Corrosion inhibiting EMI/RFI shielding composition and method of its use
AssigneeChomerics, Inc.
InventorNoredin H. Morgan
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Abstract
A corrosion inhibiting, EMI/RFI shielding composition is provided comprising a polyurethane resin which comprises a hydroxy or amine functional first polymer and an isocyanate, or isocyanurate terminated second polymer, a stabilized conductive filler, and an azole. In one embodiment of the invention a composition is provided comprising a polyurethane which comprises a fluoroolefin vinyl ether and an isocyanurate, a stabilized copper powder, and a triazole selected from the group consisting of alkyl substituted aromatic triazoles and other azoles. The invention further provides a method of composition a substrate with a composition of the invention in order to provide EMI/RFI shielding and prevent corrosion, and a substrate thus coated.
Claims25
A corrosion inhibiting conductive composition comprising
- (a) a polyurethane resin comprising
- (i) a first polymer selected from the group consisting of polyisocyanurates;
- and
- (ii) a second polymer selrcted from the group consisting of polymers having an amine functionality, polymers having a hydroxyl functionality, polymers having both amine and hydroxyl functionalities, and mixtures thereof;
- (b) a stabilized conductive filler;
- and
- (c) an azole.
A corrosion inhibiting conductive composition comprising
- (a) from about 10 to 50 weight percent of a polyurethane resin comprising
- (i) a first polymer selected from the group consisting of polyisocyanurates;
- and
- (ii) a second polymer selected from the group consisting of amines, polythiols and polyether polyols;
- b) from about 30 to 80 weight percent of a stabilized conductive filler;
- and
- c) from about 0.1 to 3 weight percent of an azole selected from the group consisting of aromatic triazoles, imidazoles or thiazoles.
Dependencies are inferred from the claim text.