2208992 of oligomers of condensed alkylakoxysilanes

Details 2208992 of oligomers of condensed alkylakoxysilanes 2208992 of oligomers of condensed alkylakoxysilanes

C - Chemistry, Metallurgy

07

F

C07F 7/18 (2006.01) B01J 2/30 (2006.01) C07F 7/08 (2006.01) C07F 7/21 (2006.01) C08G 77/04 (2006.01) C08L 83/06 (2006.01) C09D 183/04 (2006.01) C09K 3/18 (2006.01)

Patent

CA 2207977

Disclosed is a mixture of oligomers of the formula (I) or (II) Image Image (wherein R is C3-18alkyl, R1 groups are each methyl or ethyl, or are a combination of hydrogen and methyl or a combination of hydrogen and ethyl, x is 2-20, x' is at least 3, an Si/alkoxy ratio in the formulae (I) and (II) are at least 1) which may be prepared by hydrolysis and condensation of a corresponding alkyltrialkoxysilane under mild conditions. The mixture is useful for rendering mineral surfaces hydrophobic.

Un mélange d'oligomères de formule (I) ou (II) (voir la figure I) (voir la figure II), (où R est un C3-18 alkyle, R1 regroupe le méthyle ou l'éthyle, ou est une composition d'hydrogène et de méthyle ou une composition d'hydrogène et d'éthyle, x est égal à 2-20, x' compte pour au moins 3, le rapport entre Si et alkoxie dans la formule (i) et (ii) est d'au moins 1). Ce mélange peut être préparé par hydrolise et condensation d'un alkyltrialkoxisilane correspondant, dans des conditions tempérées. Le mélange est utile pour rendre les surfaces minérales hydrophobes.

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