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US 9,944,853 B2Granted
Color inhibitor for quaternary ammonium hydroxide in non-aqueous solvent
AssigneeSachem, Inc.
InventorsTim Engel, Alfred Van Lier
Life of this patent
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Abstract
A composition including a quaternary onium hydroxide in a non-aqueous solvent, wherein the quaternary ammonium hydroxide has a concentration in the range from about 5% by weight to about 50% by weight of the composition; and imidazolidine-2,4-dione, wherein the imidazolidine-2,4-dione has a concentration in the range from about 10 to about 5000 parts per million of the composition.
Claims5
A composition comprising:
- a quaternary onium hydroxide in a non-aqueous solvent, wherein the quaternary onium hydroxide has a concentration in the range from about 20% by weight to about 50% by weight of the composition;
- imidazolidine-2,4-dione, wherein the imidazolidine-2,4-dione has a concentration in the range from about 10 to about 5000 parts per million of the composition, and
- a water content of less than 0.5% by weight of the composition by Karl Fischer titration.
Dependencies are inferred from the claim text.