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|1. (WO2018123978) SURFACE TREATMENT AGENT|
|Title:||SURFACE TREATMENT AGENT|
Provided is a material capable of forming a film having excellent dirt pickup resistance and ice/frost adhesion prevention properties. This surface treatment agent is characterized by containing a copolymer which includes: a unit (a) having a C1-3 perfluoroalkyl group; a unit (c) having a group having an organopolysiloxane chain; and optionally, a unit (b) having a C4-6 perfluoroalkyl group, wherein the proportion of the unit (a) with respect to the total mass of the unit (a) and the unit (b) is 30-100 mass%, the combined proportion of the unit (a) and the unit (b) with respect to all of the units in the copolymer is 60-90 mass%, and the proportion of the unit (c) with respect to all of the units in the copolymer is 10-40 mass%.