Alkaline cleaner for ferrous-based metal surfaces
AssigneeAmchem Products, Inc.
InventorNewton W. McCready
Life of this patent
Estimating the term…
Abstract
An alkaline cleaner, cleaning solutions formed therefrom, and processes for cleaning ferrous-based metal surfaces. The compositions and processes of the invention are especially useful in removing contaminants from the surfaces of drawn and ironed black plate steel containers. The cleaner includes: (a) from about 20 to about 70% by weight of an alkali metal metasilicate or orthosilicate, or a combination thereof; (b) from 0 to about 45% by weight of an alkali metal carbonate; (c) from about 5 to about 30% by weight of an alkali metal phosphate; (d) from about 2 to about 15% by weight of a surfactant such as nonylphenoxy-(polyethoxy) ethanol; and (e) from about 2 to about 20% by weight of a polyethoxy secondary alcohol.
Claims14
An alkaline cleaner for cleaning ferrous-based metal surfaces comprising:
- (a) from about 20 to about 70% by weight of either an alkali metal metasilicate, an alkali metal orthosilicate, or a combination thereof;
- (b) from 0 to about 45% by weight of a substantially anhydrous alkali metal carbonate;
- (c) from about 5 to about 30% by weight of at least one of a substantially anhydrous (i) alkali metal tripolyphosphate, (ii) tetra alkali metal pyrophosphate, and (iii) alkali metal hexametaphosphate;
- (d) from about 2 to about 15% by weight of a surfactant of the formula ##STR2## wherein R is a saturated C.sub.8 -C.sub.12 alkyl group, x is in the range of 8 to 12, and the surfactant has a cloud point in the range of about 45.degree. to about 65.degree. C.;
- (e) from about 2 to about 20% by weight of a polyethoxy secondary alcohol of the formula
- C.sub.12-14 H.sub.25-29 O(CH.sub.2 CH.sub.2 O).sub.x [CH.sub.2 CH.sub.2 O/CH.sub.2 CH(CH.sub.3)O].sub.y CH.sub.2 CH(CH.sub.3)OH,
- wherein x is from about 5 to about 9, y is from about 1 to about 5, and the cloud point is in the range of about 35.degree. to about 45.degree. C.;
- wherein the sum of (b) and (c) is not less than about 15% by weight, and wherein an aqueous solution containing from about 10 to about 20 grams/liter of said alkaline cleaner in water has a pH in the range of from about 12.2 to about 12.8.
Dependencies are inferred from the claim text.