A method of dry cleaning articles using densified carbon...

D - Textiles – Paper – 06 – L

Patent

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Details

D06L 1/00 (2006.01) C11D 11/00 (2006.01)

Patent

CA 2474357

The present invention provides a method for the removal of stains from articles, especially fabric, using densified carbon dioxide. More particularly the invention is concerned with a method of dry cleaning an article comprising the successive steps of (a) contacting the article with a fluid dry cleaning composition containing densified carbon dioxide at a temperature between -20 and 60 ~C and a pressure between 1 and 100 MPa, so as to allow stains to dissolve and/or to disperse into the fluid dry cleaning composition and (b) separating the article and the fluid dry cleaning composition; wherein the fluid dry cleaning composition comprises an ionic surfactant in a concentration of between 0.01 and 15% by weight of the carbon dioxide and wherein during step a) at least 10%, preferably at least 30% of said ionic surfactant is present in an undissolved solid form. It was surprisingly discovered that the use of an ionic surfactant, e.g. a surfactant that contains a lipophilic alkyl residue and an amine, sulphate, phosphate and/or carboxylate residue, produces exceptionally good cleaning results if said surfactant is employed in an amount that exceeds its maximum solubility in the densified carbon dioxide composition and provided said surfactant is present during the cleaning operation in the form of undissolved solid particles.

L'invention concerne un procédé d'élimination de tâches présentes sur des articles, spécialement en tissu, au moyen de dioxyde de carbone densifié. Elle concerne, plus particulièrement, un procédé de nettoyage à sec d'un article consistant (a) à mettre en contact l'article avec une composition fluide de nettoyage à sec contenant du dioxyde de carbone densifié à une température comprise entre -20 et 60 ·C et à une pression comprise entre 1 et 100 MPa, de façon à se faire dissoudre et/ou disperser les tâches dans la composition fluide de nettoyage à sec, et (b) à séparer l'article de la composition fluide de nettoyage à sec, cette composition comprenant un tensioactif ionique dans une concentration comprise entre 0,01 et 15 % en poids du dioxyde de carbone et dans laquelle lors de l'étape a) au moins 10 %, de préférence, au moins 30 % du tensioactif ionique est présent sous une forme solide non dissoute. L'utilisation d'une tensioactif ionique, c'est à dire un tensioactif contenant un résidu alkyle lipophile et un résidu amine, sulfate, phosphate et/ou carboxylate, produit des résultats de nettoyage exceptionnellement bons si ce tensioactif est utilisé dans une quantité dépassant sa solubilité maximale dans le dioxyde de carbone densifié et qu'il soit présent, dans la phase de nettoyage, sous forme de particules solides non dissoutes.

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