Aqueous composition for removing coatings

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 9/04 (2006.01)

Patent

CA 2324264

An aqueous composition for softening or removing organic coatings comprises: (a) an effective amount of a mixture of (a1) at least one non-toxic compound of formula (I), wherein R, R1 and R2, which may be the same or different, represent lower alkyl, phenyl or lower alkyl-phenyl groups (e.g. triethylphosphate), and (a2) at least one non- toxic lower alkyl ester of a C2-20 carboxylic acid or at least one non-toxic C4-12 alkanol (e.g. dimethyl succinate, diethyl succinate, dimethyl adipate, 1,2,3-propanetriol triacetate, tri-n-butyl citrate, n-octyl acetate or methyl octanoate); (b) an effective amount of at least one surfactant to allow the composition to exist as a stable emulsion, the surfactant(s) being selected from nonionic water-soluble block copolymers of more than one alkylene oxide (e.g. Synperonic PE.TM. (F-series)); and (c) water; characterised in that component (c) (water) is present in an amount of less than about 50 % by weight and/or volume of component (a) and in that the composition exists as a stable microemulsion.

La présente invention concerne une composition aqueuse permettant de ramollir ou d'éliminer des couches organiques. Cette composition comporte (a) une quantité suffisante d'un mélange constitué d'une part (a1) au moins un composé non toxique représenté par la formule générale (I). Dans cette formule, R, R<1> et R<2>, qui peuvent être identiques ou différents sont alkyle inférieur, phényle ou alkyl-phényle inférieur, et notamment un triéthyl-phosphate. Le mélange comporte d'autre part (a2) au moins un ester d'alkyle inférieur non toxique d'un acide carboxylique en C2-C20 ou au moins un alcanol non-toxique en C4-C12 tel qu'un diméthyl-succinate, un diéthyl-succinate, un diméthyl-adipate, un 1,2,3-propanetriol-triacétate, un tri-n-butyl-citrate, un n-octyl-acétate ou un méthyl-octanoate. La composition comporte également (b) une quantité suffisante d'au moins un tensio-actif permettant à la composition d'exister sous forme d'émulsion stable. De tels tensio-actifs appartiennent au groupe des copolymères bloc hydrosolubles non-ioniques portant plusieurs oxydes d'alkylène, notamment le Synperonic PE <TM> (F-series). La composition comporte enfin (c) de l'eau. Cette composition est caractérisée en ce que le composant (c), c'est-à-dire l'eau, est présente en une proportion massique et/ou volumique inférieure à 50% du composant (a), et en ce que la composition existe sous forme de microémulsion stable.

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