Dispersion of surface-treated silica-containing inorganic oxide particles and method for producing same

A dispersion comprising, as a dispersoid, silane-bonded silica-containing inorganic oxide particles having surfaces modified with a hydrolyzable silane, and a liquid medium as a dispersion medium, wherein the dispersion medium contains a hydrolysate of the hydrolyzable silane;

• the ratio of (the number of moles of silicon atoms of the hydrolysate of the hydrolyzable silane in the dispersion medium)/(the number of moles of silicon atoms of the silane bonded to the surfaces of the inorganic oxide particles) is 0.2 to 30;
• and Q4 is greater than that before the surface modification with the silane, wherein Q4 corresponds to the case where the number of bridging oxygen atoms between silicon atoms of the silica particles is 4/2 per one silicon atom as determined by Si-NMR observation,
• wherein the hydrolyzable silane is at least one silane compound selected from the group consisting of silane compounds of the following Formulae (1) to (3):
• R3aSi(R4)4-a Formula (1)
• [R5bSi(R6)3-b]2Yc Formula (2)
• R7dSi(R8)4-e Formula (3)
• in Formula (1), R3 is an alkyl group, a halogenated alkyl group, an alkenyl group, or an organic group having an epoxy group, a (meth)acryloyl group, a mercapto group, an amino group, a ureido group, or a cyano group and is bonded to a silicon atom via an Si—C bond;
• R4 is an alkoxy group, an acyloxy group, or a halogen group;
• and a is an integer of 1 to 3;
• and
• in Formulae (2) and (3), R5 and R7 are each a C1-3 alkyl group and bonded to a silicon atom via an Si—C bond;
• R6 and R8 are each an alkoxy group, an acyloxy group, or a halogen group;
• Y is an alkylene group, an NH group, or an oxygen atom;
• at least one of R5 and R7 is a C1-3 alkyl group and bonded to a silicon atom via an Si—C bond;
• b is an integer of 1 to 3;
• c is an integer of 0 or 1;
• d is an integer of 1 to 3;
• and e is an integer of 1 to 3;
• and
• either:
• wherein, in the hydrolysate of the hydrolyzable silane contained in the dispersion medium, the hydrolysate of a silane compound of Formula (1) wherein a is an integer of 1 contains a silane compound exhibiting a specific (T2+T3)/(T0+T1) ratio of 2 to 15 or a specific (T1+T2+T3)/(T0) ratio of 5 to 100 wherein TO, T1, T2, and T3 respectively correspond to structures such that the number of bridging oxygen atoms between silicon atoms is 0/2, 1/2, 2/2, and 3/2 per one silicon atom as determined by Si-NMR observation, or
• wherein, in the hydrolysate of the hydrolyzable silane contained in the dispersion medium, the hydrolysate of a silane compound of Formula (1) wherein a is an integer of 2 contains a silane compound exhibiting a (D1+D2)/(D0) ratio of 0.1 to 10 or a (D2)/(D0+D1) ratio of 0.01 to 10 wherein DO, D1, and D2 respectively correspond to structures such that the number of bridging oxygen atoms between silicon atoms is 0/2, 1/2, and 2/2 per one silicon atom as determined by Si-NMR observation.