Silanes with hydrophilic groups, their synthesis and use as...

Details Silanes with hydrophilic groups, their synthesis and use as... Silanes with hydrophilic groups, their synthesis and use as...

C - Chemistry, Metallurgy

07

F

C07F 7/08 (2006.01) B01F 17/54 (2006.01) C11D 1/14 (2006.01) C11D 1/29 (2006.01) C11D 1/82 (2006.01) C11D 3/16 (2006.01)

Patent

CA 2124877

Silanes of the general formula (see fig. I) wherein R1, R2 and R3 in the molecule are the same or different and represent aliphatic hydrocarbon groups, R4 is a divalent hydrocarbon group with 3 to 14 carbon atoms, R5 is a group having the formula -O(CH2)b- or a polyether group having the formula -(OCnH2n)c-, wherein b has a value of 1 to 6, n has an average value of 2 to 2.5 c has a value of 1 to 10, and is 0 or 1, which fulfill the condition that they lower the surface tension of a 1% by weight aqueous solution to a value of ~ 25 mN/m at 25°C, measured with a Du Noüy tensiometer. The silanes are biologically degradable, resistant to hydrolysis and have pronounced surface active properties.

Divulgation de silanes de formule générale (voir figure I), dans laquelle : R1, R2 et R3 sont identiques ou différents et représentent des groupements hydrocarbonés aliphatiques; R4 est un groupement hydrocarboné bivalent ayant de 3 à 14 atomes de carbone; R5 est un groupement de formule -O(CH2)b- ou un groupement polyéther de formule -O(CnH2n)c, dans lesquels b est un nombre compris entre 1 et 6 inclusivement, n a une valeur moyenne allant de 2 à 2,5, c a une valeur comprise entre 1 et 10 inclusivement, et a est égal à 0 ou 1. Ces silanes ont pour propriété d'abaisser la tension superficielle d'une solution aqueuse, à 1 % en poids, à une valeur d'environ 25 mN/m à 25 .degré.C, mesurée à l'aide d'un tensiomètre DuNoüy. Ces silanes sont biodégradables, résistent à l'hydrolyse et possèdent des propriétés d'activité superficielle prononcées.

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