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US 3,940,322 AGranted
Electropolymerization of difunctional monomers to form polyimides
AssigneeWestinghouse Electric Corp.
InventorsDavid C. Phillips, William M. Alvino
Life of this patent
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Abstract
Monomers having both an amine group and an anhydride or two carboxylic acid or salt groups are electropolymerized in solution. In an alcohol solvent the polymer forms as a coating on the anode, and in an aprotic solvent the polymer remains in solution. The polymer is cured to form a polyimide.
Claims13
A method of polymerizing a monomer having a general formula selected from the group consisting of:
- ##EQU4## and mixtures thereof, where R is a trifunctional organic group and each R.sub.1 is independently selected from hydrogen and salt groups, said COOR.sub.1 and --CO-- groups being viscinal or on the same carbon atom of R, comprising:
- 1. forming a solution of said monomer in a suitable non-interfering solvent organic;
- and
- 2. passing a direct electrical current through said solution at a current density of at least about 0.2 mA/cm.sup.2.
1 more element
Dependencies are inferred from the claim text.