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US 5,698,503 AGranted
Stripping and cleaning composition
AssigneeAshland Inc.
InventorsIrl E. Ward, Francis W. Michelotti, Darryl W. Peters
Life of this patent
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Abstract
An aqueous and acidic stripping and cleaning composition is provided which contains a polyhydric alcohol, ammonium fluoride, dimethylsulfoxide and water. The pH of the composition is greater than about 4 but less than 7. Also provided is a method of stripping and cleaning utilizing the compositions of the invention. Optionally, the composition may contain a phosphate buffer.
Claims15
An aqueous and acidic stripping and cleaning composition consisting essentially of:
- a) about 55 to 85% by weight of a polyhydric alcohol having the formula selected from the group consisting of HOCH.sub.2 --CH.sub.2 O!.sub.n H and ##STR4## more;
- b) about 5 to 35% by weight of a water soluble organic polar solvent;
- c) about 0.5 to 20% by weight of ammonium fluoride;
- d) an effective amount of up to about 20% by weight total for acetic acid and ammonium acetate;
- and
- e) the remainder being water;
- said composition having a pH greater than 4 and less than 7.
4 more elements
Dependencies are inferred from the claim text.