Patent ID: 7728064

Claim:
An aqueous water- and oil-repellent dispersion comprising: (I) a homopolymer or copolymer comprising a unit derived from at least one polymerizable compound having a perfluoroalkyl or perfluoroalkenyl group and an acrylate, methacrylate or alpha-substituted acrylate group, and optionally a unit derived from another compound copolymerizable therewith, and (II) a surfactant comprising: (a) a nonionic surfactant having an HLB of less than 12, (b) a nonionic surfactant having an HLB of not less than 12 and less than 17, and (c) a nonionic surfactant having an HLB of not less than 17, at a weight ratio of (a):(b):(c) of (20-40):(50-70):(10-20), wherein the nonionic surfactant (a) comprises at least one selected from the group consisting of C 11-14 H 23-29 -iso-O(C 2 H 4 O) 3 H, C 12 H 25 O(C 2 H 4 O) 4 H, and sorbitan monopalmitate.