Patent ID: 7674928

Claim:
A composition comprising one or more compounds of formula (I) or (II): wherein: R f is a linear perfluoroalkyl having 1 to 7 carbon atoms, optionally interrupted by one to three oxygen atoms, r and q are each independently an integer of 1 to 3, j is 0 or 1, or a mixture thereof, x is from about 1 to about 2, Z is —O—, —S—, or —NR—, R is hydrogen or an alkyl group containing 1 to 4 carbon atoms X is hydrogen or M, and M is an ammonium ion, an alkali metal ion, or an alkanolammonium ion, provided that the composition is a mixture of mono and bis, said mixture providing water repellency, resistance to blocking, and open time extension to hard surface substrates treated therewith.