C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 3/18 (2006.01) C03C 17/30 (2006.01) C04B 41/49 (2006.01) C07F 7/18 (2006.01) C09D 4/00 (2006.01) D06M 13/513 (2006.01)
Patent
CA 2182869
Novel and highly reactive hydrolyzed silane emulsions are achieved by emulsifying a hydrolyzable alkoxysilane (e.g., perfluoroalkylethyltris(2-(2-methoxyethoxy)ethoxy)silane, 2-perfluoroalkylethyltris(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)silane, 2-perfluoroalkylethyltris(polyoxyethyleneglycolmonomethylether)silane or the like) in water in the presence of an effective amount of an emulsifier of sufficiently high HLB value (preferably 14 or greater) to simultaneously retain said hydrolyzable alkoxysilane compound in a substantially totally hydrolyzed state and inhibit said resulting hydrolyzed alkoxysilane compound from self-condensation. Such reactive emulsions containing fluorocarbon silanes are useful to produce durable coatings that impart oil and water repellency to substrates having siliceous, cellulosic or proteinaceous surfaces.
On obtient des émulsions nouvelles et fortement réactives de silane hydrolysé en émulsionnant un alcoxysilane hydrolysable (par exemple, un perfluoroalcoyléthyltris(2-(2-méthoxyéthoxy)éthoxy)silane, un 2-perfluoroalcoyléthyltris(2-(2-(2-méthoxyéthoxy)éthoxy)éthoxy)silane, un 2-perfluoroalcoyléthyltris(polyoxyéthylèneglycolmonométhyléther)silane, ou analogue) dans l'eau, en présence d'une quantité efficace d'un émulsionnant possédant un rapport hydro-lipophile suffisamment élevé (de présence 14 ou plus) pour retenir simultanément ce composé alcoxysilane hydrolysable dans un état pratiquement totalement hydrolysé et empêcher l'alcoxysilane hydrolysé ainsi obtenu de s'auto-condenser. De telles émulsions réactives contenant des silanes de fluorocarbure sont utiles pour produire des revêtements durables qui ont la propriété de repousser l'eau et l'huile sur des substrats possédant des surfaces silicieuses, cellulosiques ou protéiniques.
Bennett Jones Llp
E. I. Du Pont de Nemours And Company
LandOfFree
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