Non-colloidal polyamic acid electrodeposition compositions
AssigneeWestinghouse Electric Corp.
InventorDavid C. Phillips
Life of this patent
Estimating the term…
Abstract
A conducting electrodeposition composition contains a resinous polymer dissolved in concentrations to the saturation point in a balanced solvent system of two miscible liquids, one of the liquids being a solvent for the polymer and the other being a non-solvent for the polymer.
Claims16
A method of making a resinous electrodeposition composition comprising the steps of:
- A. providing a resinous salt comprising the reaction product of a polyamic acid and an organic nitrogen containing base selected from the group consisting of imidazoles and tertiary amines in a non-aqueous, organic, aprotic solvent for the salt,
- B. adding to the salt in solution, a non-aqueous, organic, non-electrolizable, non-solvent for the salt in an amount effective to provide an essentially saturated solution containing the resinous salt, said solution being electrically conducting.
A method of making a non-aqueous polyamic acid electrodeposition composition comprising the steps of:
- A. making a salt by mixing
- 1. a solution of 1 part by weight polyamic acid in about 12.5-15.5 parts by weight of a non-aqueous, organic aprotic solvent for the acid with
- 2. A nitrogen containing base selected from the group consisting of imidazoles and tertiary amines, in an amount effective to form an organic salt;
- B. adding to the salt, about 7-9 parts by weight of a non-aqueous, organic, non-electrolizable, non-solvent for the salt, to provide a solution of salt within the solvent mixture, the composition having a solids content between about 0.5 and about 5 wt.% based on the weight of polyamic acid and total solvent-non-solvent mixture.
A conductive polymeric solution comprising a salt of a carboxyl containing polymer and a miscible liquid system containing (1) a non-aqueous, organic, aprotic solvent for the polymer and (2) a non-aqueous, organic non-solvent for the polymer, the solvent and non-solvent being proportioned so that an initial concentration of polymer in the miscible system would provide an essentially saturated solution, the polymer being dissolved in said system in an amount not exceeding the initial concentration and said polymer being sufficiently chargeable, conductive, and mobile in said solution to be electrodeposited.
A non-aqueous polyamic acid electrodeposition composition, comprising a solution of acid salt within a solvent mixture, said acid salt being the reaction product of 1 part by weight polyamic acid and a nitrogen containing base selected from the group consisting of imidazoles and tertiary amines, and said solvent mixture comprising about 12.5-15.5 parts by weight of a non-aqueous, organic aprotic solvent for the acid and about 7-9 parts by weight of a non-aqueous, organic, non-electrolizable non-solvent for the salt, the composition having a solids content between about 0.5 and about 5 wt.% based on the weight of polyamic acid and total solvent-non-solvent mixture.
Dependencies are inferred from the claim text.