Surface treatment method, anti-static agent, and hydrophilizing treatment agent

A surface treatment method comprising:

• coating a treatment target with an anti-static agent comprising an electrolyte (e1), a hydrophilic polymer (a) and water, and having electrical conductivity of 15 mS/m or more and 2000 mS/m or less to obtain a coated film (A), and drying the coated film (A) to obtain an anti-static layer;
• and
• coating the anti-static layer with a hydrophilizing treatment agent comprising a hydrophilic polymer (b) and an alcohol to obtain a coated film (B), and drying the coated film (B), followed by rinsing thereof,
• wherein the electrolyte (e1) is at least one selected from the group consisting of alkali metal chloride, alkaline-earth metal chloride, alkali metal sulfate, and alkaline-earth metal sulfate;
• and
• the hydrophilic polymer (a) and the hydrophilic polymer (b) each independently comprise a polymer having at least a first group and a second group,
• wherein the first group is derived from a monomer represented by a formula selected from the group consisting of the following formulas (A5) and (A6):
• CH2=CR1—CO—NR2R3 (A5),
• wherein in the formula (A5), R1 represents a hydrogen atom or a methyl group;
• R2 and R3 are an alkyl group having 1 to 4 carbon atoms optionally substituted with at least one group selected from the group consisting of an amino group, a sulfonic acid group, and a hydroxyl group, or a hydrogen atom,
• CH2=CRS1—RS2—(SO3−M1/m)p (A6),
• wherein in the formula (A6), RS1 represents a hydrogen atom or a methyl group, RS2 represents a single bond, an aminoalkylene group, an amide bond-containing group, or an aliphatic hydrocarbon group that may have a hydrophobic substituent, M represents a hydrogen atom or m-valence cation, m is an integer of 1 to 2, and p is an integer of 1 to 2, with the proviso that when M is a hydrogen atom, M1/m, is equal to M,
• and the second group is derived from a monomer represented by a formula selected from the group consisting of the formulas (A5), (A6) and the following formula (A2):
• CH2=CR4—(R5)a—CO—R6 . . . (A2),
• wherein in the formula (A2), R4 is a hydrogen atom or a methyl group, R5 is a divalent hydrocarbon group, a is 0 or 1, R6 is —OH or —O—R7, R7 is a hydrocarbon group optionally substituted with at least one functional group selected from the group consisting of a hydroxyl group, a cyano group, and a carboxyl group.