Coated article comprising curable epoxy composition with quaternary ammonium bicarbonate curing catalyst, and method for preparing
AssigneeE. I. Du Pont de Nemours and Company
InventorPUI-YAN LIN
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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.
Claims23
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.
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.
Dependencies are inferred from the claim text.