Claims
- 1. A non-corrosive stripping and cleaning composition, which is free of hydroxylamine and its derivatives, comprising:
(a) about 5% to 50% by weight of a solvent selected from the group consisting of: N-methyl-2-pyrrolidinone, N-hydroxyethyl-2-pyrrolidinone, 1,3-dimethyl-2-imidazolidinone, dimethylsulfoxide, N,N-dimethylacetamide, sulfolane, diacetone alcohol, ethylene glycol, propylene glycol and admixtures thereof; (b) about 10% to 90% by weight of an alkanolamine selected from the group consisting of: diethyleneglycolamine, monoethanolamine, diethanolamine, triethanolamine, 2-(2-aminoethylamino)ethanol, and admixtures thereof; (c) about 0.1% to 10% by weight of a carboxylic acid type corrosion inhibitor; and (d) about 1% to 40% by weight of water.
- 2. The non-corrosive stripping and cleaning composition of claim 1, wherein said carboxylic acid corrosion inhibitor is selected from the group consisting of: formic acid, acetic acid, propionic acid, valeric acid, isovaleric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, furmaric acid, phthalic acid, 1,2,3-benzene-tricarboxylic acid, glycolic acid, lactic acid, citric acid, salicylic acid, tartaric acid, gluconic acid, and combinations thereof.
- 3. The non-corrosive stripping and cleaning composition of claim 1, wherein said solvent is present in the range between about 8-40%, said alkanolamine is present in the range between about 20-80%, said corrosion inhibitor is present in the range between about 1 to 10%, and said water is present in the range between about 5-35%.
- 4. The non-corrosive stripping and cleaning composition of claim 1, wherein said solvent is present in the range between about 10-35%, said alkanolamine is present in the range between about 30-70%, said corrosion inhibitor is present in the range between about 3 to 7%, and said water is present in the range between about 10-30%.
- 5. The non-corrosive stripping and cleaning composition of claim 1, further comprising about 0.01% to 2% by weight of a surface-active compound.
- 6. A non-corrosive stripping and cleaning composition, which is free of hydroxylamine and its derivatives, comprising:
(a) about 8-40% by weight N-methyl-2-pyrrolidinone; (b) about 20-80% by weight monoethanolamine; (c) about 3 to 7% by weight lactic acid; and (d) about 5-35% water.
Parent Case Info
[0001] This is a Continuation-In-Part of U.S. patent application Ser. No. 08/850,991, filed May 5, 1997.
Divisions (1)
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Number |
Date |
Country |
Parent |
09135809 |
Aug 1998 |
US |
Child |
09876635 |
Jun 2001 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08850991 |
May 1997 |
US |
Child |
09135809 |
Aug 1998 |
US |