| abstract |
The present invention provides a compound having the following formula (1) [wherein, the meaning of each symbol is the same as that described in the specification. ] at least one perfluoro(poly)ether group-containing silane compound surface treatment agent, wherein the perfluoro(poly)ether group-containing silane compound has a number-average molecular weight of 3,000 or more and less than 6,000, and is surface-treated 80 mol% or more of the perfluoro(poly)ether group-containing silane compound contained in the agent is a compound whose g is 2 or more. |