| 摘要 |
<p>Fluorinated condensation polymers which are made up of a combination of Blocks I and II: <IMAGE> Block I <IMAGE> +tr <IMAGE> Block II In these structures Rf is a branched or linear perfluoroalkyl or perfluorooxaalkyl group of 5-18 carbons, R3 is an aliphatic triradical of 2-50 carbon atoms selected from the group consisting of branched or straight chain alkylene, alkylenethioalkylene, alkyleneoxyalkylene and alkyleneiminoalkylene, R4 is hydrogen or methyl, D is the organic divalent radial of a diisocyanate, K IS 8-100, M IS AN INTEGER OF 1 TO 5, N IS 1 OR 2, AND P IS AN INTEGER OF 1 TO 5, WHEREIN Blocks I and II are combined in a ratio of at least about 15% to 70% by weight of Block I to 30% to 85% by weight of Block II.</p> |
