Patent ID: 8176981

Claim:
A nonionic fluorinated polymeric surfactant having a weight average molecular weight of least 100,000 grams per mole, the nonionic fluorinated polymeric surfactant comprising: divalent units independently represented by formula I: in a range from 30% to 65% by weight, based on the total weight of the nonionic fluorinated polymeric surfactant; and divalent units independently represented by formula II: in a range from 70% to 35% by weight, based on the total weight of the nonionic fluorinated polymeric surfactant; wherein R f is a perfluoroalkyl group having from 3 to 4 carbon atoms; R and R 2 are each independently hydrogen or alkyl of 1 to 4 carbon atoms; R 1 is alkyl of 16 to 24 carbon atoms; and n is an integer from 2 to 11.