Repellent materials

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/28 (2006.01) D06M 15/576 (2006.01)

Patent

CA 2617512

Urethane compositions comprising (a) a first fluorochemical urethane polymer or oligomer comprising the reaction product of (1) one or more polyisocyanates and (2) one or more fluoroalcohols, and optionally (3) one or more other isocyanate-reactive materials, wherein the ratio of isocyanate to isocyanate- reactive groups is about 1 or less, i.e., Part A, and (b) a second urethane polymer or oligomer comprising the reaction product of (1) one or more diisocyanates, and (2) water, and optionally (3) one or more other isocyanate- reactive groups, wherein about 5 to about 95 mole percent of the isocyanate groups of the diisocyanate are reacted with the water, i.e., Part B, for imparting durable repellency to substrates.

L'invention concerne des compositions d'uréthane comprenant (a) un premier polymère ou oligomère d'uréthane fluorochimique renfermant le produit de réaction entre (1) un ou plusieurs polyisocyanates et (2) un ou plusieurs fluoroalcools, et éventuellement (3) une ou plusieurs substances réactives à l'isocyanate, le rapport entre l'isocyanate et les groupes réactifs à l'isocyanate étant inférieur ou égal à environ 1, soit la partie A, et (b) un second polymère ou oligomère d'uréthane renfermant le produit de réaction entre (1) un ou plusieurs diisocyanates et (2) de l'eau, et éventuellement (3) un ou plusieurs groupes réactifs à l'isocyanate, entre environ 5 et environ 95% molaires des groupes isocyanate du diisocyanate réagissant avec l'eau, soit la partie B. Ces compositions permettent de conférer une résistance au mouillage durable à des substrats.

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