Film-forming copolymers and their use in water vapour...

C - Chemistry – Metallurgy – 08 – G

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C08G 81/00 (2006.01) C08G 18/61 (2006.01) C08G 77/48 (2006.01) D06M 15/564 (2006.01) D06M 15/643 (2006.01) D06M 15/647 (2006.01)

Patent

CA 2039076

A film-forming copolymer is formed by copolymerising 100 parts of a curable polyurethane resin and 10 to 100 parts of an organosilicon compound, consisting essentially of SiO2, R3SiO 1/2 and R'R2Sio 1/2 units, the ratio of monovalent units to tetravalent units being from 0.4/1 to 2/1 and from 40 to 90% of all monovalent units being R'R2SiO 1/2 units. R is a monovalent hydrocarbon group having up to 8 carbons and R' denotes a OH-terminated polyoxyalkylene group. The invention also includes a method of making fabrics waterproof and permeable to water vapour by coating it with such copolymer.

On forme un copolymère filmogène en copolymérisant 100 parties de résine polyuréthane durcissable et de 10 à 100 parties d'un composé organosilicié, constitué essentiellement d'unités de SiO2, de R3SiO1/2 et de R'R2SiO1/2; le rapport des nombres d'unités monovalentes et tétravalentes a une valeur allant de 0,4/1 à 2/1, et de 40 à 90 % de toutes les unités monovalentes sont des unités de R'R2SiO1/2. R représente un groupement hydrocarboné monovalent en C1-C8, et R' représente un groupement polyoxyalkylène terminé par des groupements OH. Cette invention concerne également une méthode de fabrication de tissus étanches à l'eau et perméables à la vapeur d'eau, en les revêtant d'un tel copolymère.

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