Antifouling processing agent composition, and articles and textile products treated by using the same

An antifouling processing agent composition comprising a fluorinated polymer and a fluorinated amphoteric surfactant,

• wherein the fluorinated polymer comprises, to the total amount of units based on monomers constituting the fluorinated polymer, from 30 to 70 mass % of units based on a monomer represented by the following formula (1) and from 20 to 60 mass % of units based on a monomer represented by the following formula (2), and has a number average molecular weight of from 3,000 to 500,000, and
• the fluorinated amphoteric surfactant has a C1-6 perfluoroalkyl group or a C3-9 perfluoroalkenyl group, and has a number average molecular weight of less than 3,000:
• F(CF2)nY—OCOCR═CH2 (1)
• CH2═CR1—COO—(R2O)q—R3 (2)
• wherein n represents an integer of 1 to 6, Y represents a C1-10 alkylene group, R represents a hydrogen atom, a C1-3 alkyl group or a halogen atom, R1 represents a hydrogen atom or a methyl group, and R2 represents a C2-4 alkylene group, R3 represents a hydrogen atom, a C1-8 alkyl group, a (meth)acryloyl group or a glycidyl group, and q represents an integer of 1 to 140, and in a case where q is an integer of at least 2, the plurality of —(R2O)— may be the same as or different from each other.