Electrolyte for very high voltage electrolytic capacitors
AssigneeKemet Electronics Corporation
InventorsBrian John Melody, John Tony Kinard, David Alexander Wheeler
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Abstract
An electrolyte comprising a polyester condensation product of 2-methyl-1,3-propane diol and boric acid; and further comprising dimethyl amino ethoxy ethanol in an amount to reduce the resistance of the electrolyte. The electrolyte may further comprise ortho-phosphoric acid and at least one substituted pyrrolidone or lactone, such as N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-hydroxy ethyl-2-pyrrolidone or 4-butyrolactone. The ortho-phosphoric acid prevents hydration of anodic aluminum oxide in contact with the solution. The pyrrolidone or lactone reduce the resistance of the electrolyte. The electrolyte may also comprise sodium silicate.
Claims28
An electrolyte comprising a polyester condensation product of 2-methyl-1,3-propane diol and boric acid;
- and further comprising dimethyl amino ethoxy ethanol.
An electrolyte comprising a polyester condensation product of 2-methyl-1,3-propane diol and boric acid;
- dimethyl amino ethoxy ethanol;
- ortho-phosphoric acid;
- at least one pyrrolidone or lactone;
- and sodium silicate.
An electrolyte comprising a polyester condensation product of 2-methyl-1,3-propane diol and boric acid;
- and about 2 wt % to about 6 wt % of dimethyl amino ethoxy ethanol;
- about 0.1 wt % to about 1.0 wt % ortho-phosphoric acid;
- about 6 wt % N-hydroxy ethyl-2-pyrrolidone;
- and sodium silicate.
A method of anodizing a valve metal substrate or repairing flaws in an anodic oxide coating a valve metal substrate comprising immersing the substrate in an electrolyte and applying sufficient anodizing voltage to the solution;
- wherein the electrolyte solution comprises a polyester condensation product of 2-methyl-1,3-propane diol and boric acid and dimethyl amino ethoxy ethanol.
A method of anodizing a valve metal substrate or repairing flaws in an anodic oxide coating a valve metal substrate comprising immersing the substrate in an electrolyte and applying sufficient anodizing voltage to the solution;
- wherein the electrolyte solution comprises a polyester condensation product of 2-methyl-1,3-propane diol and boric acid;
- dimethyl amino ethoxy ethanol;
- ortho-phosphoric acid;
- at least one pyrrolidone or lactone;
- and sodium silicate.
Dependencies are inferred from the claim text.