Urea, substituted, containing fluorine

N-substituted, long-chain alkyl monomethylol cyclic ureas have also been used to waterproof cotton through etherification. Other water-repellent finishes for cotton are produced by cross-linked silicone films (117). In addition to the poljunerization of the phosphorus-containing poljuners on cotton to impart flame retardancy and of silicone to impart water repellency, polyfluorinated polymers have been successfully applied to cotton to impart oil repellency. Chemical attachment to the cotton is not necessary for durability oil repellency occurs because of the low surface energy of the fluorinated surface (118). 

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