CPC C03C 14/004 (2013.01) [C03C 11/002 (2013.01); C03C 17/007 (2013.01); C03C 17/02 (2013.01); C03C 17/3411 (2013.01); C03C 17/42 (2013.01); G02B 1/113 (2013.01); C03C 2217/425 (2013.01); C03C 2217/452 (2013.01); C03C 2217/465 (2013.01); C03C 2217/478 (2013.01); C03C 2217/732 (2013.01); C03C 2217/734 (2013.01); C03C 2217/76 (2013.01); C03C 2218/113 (2013.01); C03C 2218/116 (2013.01); C03C 2218/32 (2013.01)] | 34 Claims |
1. A member having a porous layer on a substrate, wherein
the porous layer contains a plurality of silicon oxide particles bound by an inorganic binder and at least one acid selected from the group consisting of the following formulae (1) to (4):
wherein
A1 in the formula (1) denotes COOH, and n denotes an integer in the range of 2 to 8,
one of A2 and A3 in the formula (2) denotes SO3H or PO3H2, and the other denotes an acidic group selected from the group consisting of SO3H, PO3H2, COOH, and OH, and R denotes a divalent organic group having 1 to 20 carbon atoms,
at least one of A2, A3, and A4 in the formula (3) denotes SO3H or PO3H2, and the other denotes an acidic group selected from the group consisting of SO3H, PO3H2, COOH, and OH, and R denotes a trivalent organic group having 1 to 20 carbon atoms, and
at least one of A2, A3, A4, and A5 in the formula (4) denotes SO3H or PO3H2, and the other denotes an acidic group selected from the group consisting of SO3H, PO3H2, COOH, and OH, and R denotes a tetravalent organic group having 1 to 20 carbon atoms.
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