| abstract |
(57) [Summary] [Problem] To suppress the odor of the obtained hydrophilized film itself even after long-term use, and to suppress the generation of unpleasant odor after being in the presence of odorous substances, The present invention provides a hydrophilic treatment agent, a hydrophilic treatment method, and an aluminum material or an aluminum alloy material treated by the above-mentioned hydrophilic treatment method, which can be preferably used for a heat exchanger or the like. SOLUTION: This is a hydrophilic treatment agent containing a radical polymer having a number average molecular weight of 1,000 to 1,000,000 and having a hydroxyl group and an ester bond, wherein the hydroxyl group is 5% of the hydroxyl group and the ester bond of the radical polymer. 0 to 99.9 mol%, and the ester bond is 0.1 to 50 mol%. Mol%, and the radical polymer is 0.1 to 30% by mass of the hydrophilic treatment agent. |