| 摘要 |
The present invention comprises an aqueous emulsion for imparting oil and water repellency to textiles prepared by polymerizing a mixture of monomers (a), (b) and (c) as follows:(a) 70-90% polymer chain units derived from a mixture of monomers of the formula: wherein Rf is a straight or branched-chain perfluoroalkyl group containing from 2 to about 20 carbon atoms; R is H or CH3; A is O, S, or N(R'); Q is alkylene of 1 to 15 carbon atoms, hydroxyalkylene of 3 to 15 carbon atoms, -(CnH2n)(OCqH2q)m-, -SO2-NR'(CnH2n)-, or -CONR'(CnH2n)-, wherein R' is H or alkyl of 1 to about 4 carbon atoms, n is 1 to about 15, q is 2 to about 4, and m is 1 to about 15;(b) 5-25% monomer chain units derived from a long-chain alkyl (meth)acrylate of the formula: wherein R'' is an alkyl group of about 12 to about 24 carbons and R is H or CH3;(c) 0.1-2.5% monomer chain units derived from compounds of the formulas: or wherein R is H or CH3;followed by adding an aromatic blocked isocyanate, and then adding the mixed fluoropolymer-isocyanate solution to water to create an aqueous dispersion.
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