# US 2013/0157058 A1 · Coated article comprising curable epoxy composition with quaternary ammonium bicarbonate curing catalyst, and method for preparing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157058 A1 - Document ID: US20130157058A1 - Status: Published application - Kind: A1 - Application number: 13/327,793 - Filed: 2011-12-16 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: E. I. Du Pont de Nemours and Company - Inventors: PUI-YAN LIN - Web page: https://patentgrep.com/patent/US20130157058A1 ## CPC - C08G 59/686: {containing nitrogen} - B32B 15/088: comprising polyamides - C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)} - C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50) - C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins - H05K 3/281: {by means of a preformed insulating foil (H05K3/284 takes precedence)} - B05D 2504/00: Epoxy polymers - B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer - B32B 2255/24: Organic non-macromolecular coating - B32B 2457/08: PCBs, i.e. printed circuit boards - C08J 2379/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - C08J 2463/02: Polyglycidyl ethers of bis-phenols - H05K 1/0393: {Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups)} - Y10T 428/31511: Of epoxy ether - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Quaternary ammonium bicarbonates are suitable for use as latent catalysts in curable epoxy compositions. The curable compositions prepared therefrom are used to prepare coated substrates, and to produce conformally sealed printed wiring boards and flexible circuits. Method for preparation and curing are also provided. Of particular utility are compositions comprising benzyltrimethyl ammonium bicarbonate. The curable epoxy composition is coated onto a substrate such as a film or sheet, to form a coated article. The cure of the epoxy can be advanced after coating. ## Claims ### Claim 1 A coated article comprising a substrate having disposed thereupon a coating wherein said coating comprises an epoxy having a plurality of cross-linkable functional groups, a curing agent, and a quaternary ammonium bicarbonate, wherein the quaternary ammonium bicarbonate is represented by Structure I. R1R2R3R4N+HCO3− I wherein each of R1, R2, R3, and R4 are independently alkyl, phenyl, alkylbenzene, H, alkoxy, with the proviso that at least one of R1, R2, R3, and R4 is not H. ### Claim 2 (depends on 1) The coated article of claim 1 wherein the quaternary ammonium bicarbonate is benzyltrimethyl ammonium bicarbonate. ### Claim 3 (depends on 1) The coated article of claim 1 wherein the curing agent is phenolic. ### Claim 4 (depends on 1) The coated article of claim 1 wherein the coating further comprises a solvent. ### Claim 5 (depends on 1) The coated article of claim 1 wherein the epoxy is advanced to 45 to 85% cure. ### Claim 6 (depends on 5) The coated article of claim 5 wherein the epoxy is advanced to 55 to 75% cure. ### Claim 7 (depends on 1) The coated article of claim 1 wherein the epoxy comprises bisphenol A or bisphenol F. ### Claim 8 (depends on 5) The coated article of claim 5 wherein the epoxy comprises bisphenol A or bisphenol F, the curing agent is phenolic, and the quaternary ammonium bicarbonate is benzyltrimethyl ammonium bicarbonate, ### Claim 9 (depends on 8) The coated article of claim 8 wherein the epoxy is advanced to 55 to 75% cure. ### Claim 10 (depends on 1) The coated article of claim 1 in the form of a coated film or sheet. ### Claim 11 (depends on 9) The coated article of claim 9 in the form of a coated film or sheet. ### Claim 12 (depends on 9) The coated article of claim 9 wherein the film or sheet is a polyimide film or sheet. ### Claim 13 (depends on 12) The coated article of claim 12 wherein the polyimide is a fully aromatic polyimide. ### Claim 14 A method for preparing a coated substrate, the method comprising causing an uncured epoxy composition to be coated onto a substrate at a temperature below 100° C., wherein said uncured epoxy composition comprises an epoxy having a plurality of cross-linkable epoxide functional groups, a curing agent, a solvent, and a quaternary ammonium bicarbonate, wherein the quaternary ammonium bicarbonate is represented by Structure I. ### Claim 15 (depends on 14) The method of claim 14 wherein the quaternary ammonium bicarbonate is benzyltrimethyl ammonium bicarbonate. ### Claim 16 (depends on 14) The method of claim 14 wherein the curing agent is phenolic. ### Claim 17 (depends on 14) The method of claim 14 wherein the epoxy is bisphenol A or bisphenol F. ### Claim 18 (depends on 14) The method of claim 14 further comprising removing the solvent, and heating the coated substrate to a temperature in the range of 50 to <120° C. to advance the cure to 45 to 85% cure. ### Claim 19 (depends on 18) The method of claim 18 wherein the cure is advanced to 55 to 75% cure. ### Claim 20 (depends on 19) The method of claim 19 wherein the epoxy comprises bisphenol A or bisphenol F, the curing agent is phenolic, and the quaternary ammonium bicarbonate is benzyltrimethyl ammonium bicarbonate. ### Claim 21 (depends on 19) The method of claim 19 wherein the substrate is a film or sheet. ### Claim 22 (depends on 21) The method of claim 21 wherein the substrate is a polyimide film or sheet. ### Claim 23 (depends on 22) The method of claim 22 wherein the substrate is a fully aromatic film or sheet.