| 摘要 |
Disclosed are compositions comprising an aqueous solution or dispersion of at least one polyurethane having at least one urea linkage prepared by: (i) reacting (a) at least one diisocyanate, polyisocyanate, or mixture thereof, having isocyanate groups, and (b) at least one fluorinated compound selected from the formula (I): Rf1-L-X (I) wherein: Rf1 is a monovalent, partially or fully fluorinated, linear or branched, radical having 2 to 100 carbon atoms, L is a bond or a linear or branched divalent linking group having 1 to about 20 carbon atoms, X is OH, N(R1)H, or SH wherein R1 is H or C1 to C6 alkyl; and thereafter (ii) reacting with (c) water and (d) an isocyanate-reactive fluorinated particulate component, wherein the fluorinated particulate component has an average particle size of about 10 to about 500 nm and comprises 1) inorganic oxides of Si, Ti, Zn, Mn, AI, and Zr; 2) a colloidal particle made by hydrolysis of an alkoxy silane, chlorosilane, metal alkoxide, or metal halide; or 3) a fumed silica.
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