Improved aqueous cleaning solution and method for removing...

C - Chemistry – Metallurgy – 11 – D

Patent

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C11D 1/94 (2006.01) C11D 1/62 (2006.01) C11D 1/90 (2006.01) C23G 1/14 (2006.01)

Patent

CA 2331453

An alkaline, aqueous cleaning solution which is capable of removing at least a substantial portion of uncured adhesive residues, e.g., epoxy-based adhesives, from a substrate, preferably a metal stencil substrate, contains water, an alkalinity-providing agent and a synergistic combination of surfactants, specifically an N-alkylpyrrolidone surfactant, which is preferably N-octyl-2-pyrrolidone, and an aminocarboxylic acid surfactant, which is preferably N-coco-beta- aminopropionic acid. At an active-concentration ratio of the N-alkyl-2-pyrrolidone surfactant to the aminocarboxylic acid surfactant of from about 1:1 to about 3.5:1 and a total active concentration of at least 0.30 % by weight of the aqueous cleaning solution, the N-alkyl-2- pyrrolidone and aminocarboxylic acid surfactants synergistically improve the ability of the solution to remove uncured adhesive residues from the substrate, even at relatively low wash temperatures, e.g., from about 70 °F to less than about 135 °F.

L'invention concerne une solution alcaline aqueuse permettant d'éliminer au moins une partie substantielle de résidus adhésifs non durcis sur un substrat (par exemple, adhésifs à base d'époxy), de préférence sur un substrat du type pochoir en métal. La solution renferme de l'eau, un agent fournisseur d'alcalinité et une combinaison synergique de tensioactifs, spécifiquement un tensioactif du type N-alkylpyrrolidone, de préférence N-octyle-2-pyrrolidone, et un tensioactif du type acide aminocarboxylique, de préférence acide N-coco-bêta-aminopropionique. Pour un rapport de concentration actif entre tensioactif N-alkyle-2-pyrrolidone et tensioactif acide aminocarboxylique allant de 1:1 environ à 3,5:1 environ, et pour une concentration active totale dans la solution de nettoyage aqueuse au moins égale à 0,30 %, en poids, les tensioactifs N-alkyle-2-pyrrolidone et acide aminocarboxylique engendrent une amélioration synergique de la capacité de ladite solution à éliminer les résidus adhésifs non durcis sur le substrat, même à des températures de lavage relativement faibles (par exemple, à partir d'environ 70 DEG F et en dessous d'environ 135 DEG F).

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