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EP0437979A2
Expired / Lapsed
EP
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Corrosion inhibiting EMI/RFI shielding coating and method of its use
Assignee: Parker Hannifin Corp
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Filing: 1990-12-28
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Granted: —
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Expires: 2010-12-28
Abstract
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 terminated second polymer, a stabilized conductive filler, and an azole. In one embodiment of the invention a coating is provided comprising a polyurethane which comprises a fluoroolefin vinyl ether and an isocyanate terminated castor oil prepolymer, 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 coating a substrate with a coating of the invention in order to provide EMI/RFI shielding and prevent corrosion, and a substrate thus coated.
Inventors
- 👤 Noredin Hassan Morgan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:17
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/5027; C08G18/62; C08G18/6275; C08G18/6279; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8051; C09; C09D; C09D5/00; C09D5/08; C09D5/24; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/3158; Y10T428/31605; Y10T428/31609
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
56 words
A corrosion inhibiting conductive coating comprising: (a) a polyurethane resin comprising: (i) a first polymer which is an isocyanate or isocyanate terminated prepolymer; and (ii) a second polymer having an amine functionality, a hydroxyl functionality, both amine and hydroxyl functionality, a thiol functionality or a mixture thereof; (b) a stabilized conductive filler; and (c) an azole.
Claim 2
Dependent Claim
85 words
A corrosion inhibiting conductive coating comprising: (a) from about 10 to 50 weight percent of a polyurethane resin comprising: (i) a first polymer selected from the group consisting of isocyanates and isocyanate terminated prepolymers; and (ii) a second polymer selected from the group consisting of amines, polythiols and polyether polyols; (b) from 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.
Claim 3
Dependent Claim
23 words
A coating according to claim 1 or 2 wherein the polyurethane resin is from about 10 to 25 weight percent of the coating.
Claim 4
Dependent Claim
27 words
A coating according to claim 1, 2 or 3 wherein the first and second polymers are present in a weight ratio of from about 1:2 to 1:6.
Claim 5
Dependent Claim
26 words
A coating according to any one of the preceding claims wherein the stabilized conductive filler is from about 40 to 70 weight percent of the coating.
Claim 6
Dependent Claim
25 words
A coating according to any one of the preceding claims wherein the aromatic triazole is from about 0.5 to 1.75 weight percent of the coating.
Claim 7
Dependent Claim
17 words
A coating according to any one of the preceding claims wherein the first polymer is an isocyanate.
Claim 8
Dependent Claim
12 words
A coating according to claim 7 wherein the isocyanate is methylene diisocyanate.
Claim 9
Dependent Claim
22 words
A coating according to any one of the preceding claims wherein the first polymer is a methylene diisocyanate terminated castor oil prepolymer.
Claim 10
Dependent Claim
16 words
A coating according to any one of the preceding claims wherein the second polymer is fluorinated.
Claim 11
Dependent Claim
21 words
A coating according to any one of the preceding claims wherein the second polymer is a polyether polyol or polyether amine.
Claim 12
Dependent Claim
20 words
A coating according to any one of the preceding claims wherein the second polymer is a fluoroolefin vinyl ether copolymer.
Claim 13
Dependent Claim
35 words
A coating according to any one of the preceding claims wherein the stabilized conductive filler is selected from the group consisting of stabilized copper powder, nickel powder, silver plated metals, nickel-graphite fibers and mixtures thereof.
Claim 14
Dependent Claim
57 words
A coating according to claim 13 wherein the stabilized copper powder is produced by a process which comprises coating copper powder with silver metal using a silver complex salt solution comprising from 3 to 30 weight percent silver nitrate, from 15 to 70 weight percent ammonium bicarbonate, and from 23 to 75 weight percent trisodium ethylenediaminetetraacetic acid.
Claim 15
Dependent Claim
27 words
A coating according to any one of the preceding claims wherein the stabilized conductive filler is produced by coating an unstabilized conductive filler with a fatty acid.
Claim 16
Dependent Claim
27 words
A coating according to any one of the preceding claims wherein the stabilized conductive filler is produced by coating an unstabilized conductive filler with a noble metal.
Claim 17
Dependent Claim
25 words
A coating according to any one of the preceding claims wherein the azole is selected from the group consisting of aromatic triazoles, imidazoles, and thiazoles.
Claim 18
Dependent Claim
20 words
A coating according to claim 17 wherein the aromatic triazole is selected from the group consisting of tolytriazole and benzotriazole.
Claim 19
Dependent Claim
15 words
A coating according to any one of the preceding claims further comprising a chromate salt.
Claim 20
Dependent Claim
13 words
A coating according to claim 19 wherein the chromate salt is zinc chromate.
Claim 21
Dependent Claim
19 words
A corrosion inhibiting conductive coating according to any one of the preceding claims wherein the second polymer is polytetramethyleneoxide-di-p-aminobenzoate.
Claim 22
Dependent Claim
27 words
A corrosion inhibiting conductive coating according to any one of the preceding claims wherein the second polymer has a hydroxyl or amine functionality of greater than 1.
Claim 23
Independent Claim
32 words
A method of inhibiting corrosion of conductive substrates while maintaining EMI/RFI shielding which comprises applying to a conductive substrate a corrosion inhibiting coating according to any one of claims 1 to 22.
Claim 24
Dependent Claim
16 words
A method according to claim 23 further comprising the step of curing the corrosion inhibiting coating.
Claim 25
Dependent Claim
20 words
A method according to claim 23 or 24 wherein the coating is cured for at least 30 minutes at 250°F.
Claim 26
Dependent Claim
21 words
A method according to claim 23 or 24 wherein the coating is cured for at least 5 days at room temperature.
Claim 27
Independent Claim
22 words
A method according to any one of claims 23 to 26 wherein the coating is applied to the conductive substrate by spraying.
Claim 28
Dependent Claim
45 words
A corrosion resistant substrate comprising a conductive substrate and, on the surface of said conductive substrate, a corrosion inhibiting coating according to any one of claims 1 to 22 or a coating applied by a method according to any one of claims 23 to 27.
Claim 29
Dependent Claim
14 words
A corrosion resistant substrate according to claim 28 wherein the conductive substrate is aluminium.
Claim 30
Dependent Claim
17 words
A corrosion resistant substrate according to claim 28 wherein the conductive substrate is a metal filled composite.
References Cited (Backward Citations)
No citation records indexed.
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