| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter which maintains oil repellency performance even in a high temperature.SOLUTION: A filter is treated with a fluorine-containing processing agent containing a fluorine-containing polymer having (a) a repeating unit induced from fluorine-containing monomer, (b) monomer homopolymer of which has the glass transition point of 50°C or more and/or a repeating unit induced from non-fluorine monomer being (meth)acrylate monomer having a cyclic hydrocarbon group, and (c) a repeating unit induced from hydrophilic monomer. |
