Compositions and methods for removing sealant compositions
AssigneeAmchem Products, Inc.
InventorsTimothy J. C. Smith, Jurgen Geke, Robert Q. Cooper
Life of this patent
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Abstract
Aqueous compositions containing as essential ingredients; an alkanolamine, an aliphatic carboxylic acid containing 5 to 18 carbon atoms, and an arylenetriazole have been found effective in removing resin-containing sealants from the surfaces of zinc containing metals, such as galvanized steel, without causing changes in the surfaces of the metal, so that phosphate coatings which are subsequently applied to said surfaces are neither streaky nor spotty.
Claims25
A aqueous alkaline composition which is effective in removing a resin-containing sealant from ferrous and zinc containing metals without adversely affecting the surfaces of the metal, containing as essential ingredients:
- an alkanolamine, an aliphatic carboxylic acid containing 5 to 18 carbon atoms, and an arylenetriazole having the formula ##STR3## where Ar is o-phenylene, monoalkyl-o-phenylene, polyalkyl-o-phenylene, o-naphthylene and alkyl-o-naphthylene where the alkyl group has from 1 to 4 carbon atoms, wherein the alkanolamine and the aliphatic carboxylic acid are present in the composition in amounts sufficient to remove the resin-containing sealant when the aqueous composition is applied thereto and wherein the arylenetriazole is present in a quantity sufficient to prevent attack on the metal surfaces by the aqueous alkaline solution.
An aqueous composition containing in approximate parts by weight:
- ______________________________________ an alkanolamine 10-30 an aliphatic carboxylic acid 9-13 containing 5 to 18 carbon atoms an arylenetriazole 0.1-0.35 surfactant 0-10 water q.s. 100. ______________________________________
Dependencies are inferred from the claim text.