| 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: The side chain has the formula (I) [In the formula, n represents an integer of 1 to 500, R 1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R 2 represents a hydrogen atom or a methyl group. A modified polyvinyl alcohol having a group represented by the following formula (I), wherein the group represented by the above formula (I) is 0.01 to 20 mol%, and the modified polyvinyl alcohol is A hydrophilizing agent which is 0.1 to 30% by mass of the hydrophilizing agent. |