Fluorochemical composition for treatment of a fibrous substrate

D - Textiles – Paper – 06 – M

Patent

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D06M 15/576 (2006.01) C08G 18/28 (2006.01) C08G 18/38 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08G 18/62 (2006.01) C08G 18/71 (2006.01) C08G 18/79 (2006.01) C09D 175/04 (2006.01) D06M 15/53 (2006.01)

Patent

CA 2493857

Fluorochemical composition for rendering fibrous substrates oil repellent, water repellent, and/or stain or soil repellent. The composition comprises a dispersion or a solution of a fluorinated compound which comprises the reaction product of the following combination of reactants: (i) a fluorinated polyether according to the Formula (I): Rf-Q-Tk wherein Rf represents a monovalent perfluorinated polyether group having a molecular weight of at least 750g/mol, Q represents a chemical bond or a divalent or trivalent organic linking group, T represents a functional group capable of reacting with an isocyanate and k is 1 or 2; (ii) an isocyanate component selected from a polyisocyanate compound that has at least 3 isocyanate groups or a mixture of polyisocyanate compounds wherein the average number of isocyanate groups per molecule is more than 2; and (iii) optionally one or more co-reactants capable of reacting with an isocyanate group.

L'invention concerne une composition fluorée servant à rendre des substrats fibreux oléofuges, hydrofuges et/ou résistants aux taches ou aux salissures. La composition comprend une dispersion ou une solution d'un composé fluoré renfermant le mélange de réactifs suivant : (i) un polyéther fluoré représenté par la formule générale (I) R¿f?-Q-T¿k?, dans laquelle R¿f? désigne un groupe polyéther perfluoré monovalent de masse moléculaire supérieure ou égale à 750 g/mol, Q désigne une liaison chimique ou un groupe de liaison organique divalent ou trivalent, T désigne un groupe fonctionnel capable de réagir avec un isocyanate et k vaut 1 ou 2 ; (ii) un composé isocyanate sélectionné entre un composé polyisocyanate formé d'au moins trois groupes isocyanate ou un mélange de composés polyisocyanate dans lequel le nombre moyen de groupes isocyanate par molécule est supérieur à 2 ; et (iii) éventuellement un ou plusieurs co-réactifs capables de réagir avec un groupe isocyanate.

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