Composition and process for barrier coating and/or cleaning...

C - Chemistry – Metallurgy – 09 – D

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C09D 9/00 (2006.01) C09D 5/00 (2006.01)

Patent

CA 2277968

An improved aqueous liquid composition for power washing of paint masks contains: organic film-forming polymer, preferably polyacrylamide; inorganic salts, preferably a combination of alkali metal pyrophosphate, metaborate, and tetraborate; and dissolved organic molecules that (i) are hydrocarbons except for having hydroxyl substituents and, optionally, having one or more other types of substituents selected from halogen atoms, keto groups, and aldehydo groups and (ii) have a number ratio of oxygen atoms to carbon atoms that is at least 0.5; and, optionally but preferably, free boric acid.

Cette composition liquide aqueuse pour lavage efficace de masques à peindre renferme un polymère organique filmogène, un polyacrylamide de préférence, des sels minéraux, une combinaison de pyrophosphate de métaborate et de tétraborate de métal alcalin de préférence, ainsi que des molécules organiques dissoutes, (i), sous forme d'hydrocarbures, en l'occurrence d'hydrocarbures se distinguant par le fait qu'ils sont substitués par de l'hydroxy et, éventuellement, qu'ils ont un ou plusieurs types de substituants issus du groupe constitué par des atomes halogènes, des groupes CO et des groupes aldéhydo et, (ii), des molécules organiques dissoutes dont le rapport de numéro atomique oxygène - carbone est au moins égal à 0,5. Cette composition est également susceptible de contenir, facultativement mais de préférence, de l'acide borique libre.

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