Coating agent composition and antibacterial/antiviral member

1. A coating agent composition, comprising:

photocatalyst particles composed of metal oxide in which an upper end potential of a valence band is 3 V (vs SHE) or more and a lower end potential of a conduction band is 0.16 V (vs SHE) or less;

cuprous oxide particles;

metal oxide particles without photocatalytic activity;

a binder resin; and

an organic solvent,

wherein, in 100 parts by mass of a non-volatile matter content of the coating agent composition, a content of the photocatalyst particles is 1 to 80 parts by mass, a content of the cuprous oxide particles is 0.1 to 5 parts by mass, and a total content of the photocatalyst particles and the metal oxide particles is 40 to 80 parts by mass, the non-volatile matter content being matter obtained by evaporating the organic solvent from a mixture of the photocatalyst particles, the cuprous oxide particles, the metal oxide particles, the binder resin and the organic solvent,

average secondary particle diameters of each of the photocatalyst particles, the cuprous oxide particles and the metal oxide particles are 50 nm to 200 nm, and

average primary particle diameters of each of the photocatalyst particles and the cuprous oxide particles are 2 nm to 80 nm.

2. The coating agent composition according to claim 1 , wherein the binder resin is an active energy ray curing resin having an unsaturated hydrocarbon group, and

the organic solvent contains a glycol ether-based solvent, and further, a content of the glycol ether-based solvent with respect to 100 parts by mass of the non-volatile matter content of the coating agent composition is 10 parts by mass or more.

3. The coating agent composition according to claim 2 , wherein a photoinitiator with a molecular weight of 300 or more is present in an amount of 0.1 to 5 parts by mass with respect to 100 parts by mass of the active energy ray curing resin.

4. The coating agent composition according to claim 1 , further comprising a dimethylsiloxane compound including 20 to 150 units of a dimethylsiloxane component represented by (—Si(—CH 3 ) 2 —O—) and an unsaturated hydrocarbon group, wherein the dimethylsiloxane compound is present in an amount of 0.1 to 5 parts by mass with respect to 100 parts by mass of the non-volatile matter content of the coating agent composition.

5. The coating agent composition according to claim 1 , further comprising a fluorine-containing olefin compound including 2 to 10 units of a fluorine-containing olefin component represented by (—CF i H j —CF k H l —) (0≤i≤2, 0≤k≤2, i+k≥1, j=2−i, and l=2−k) and an unsaturated hydrocarbon group, wherein the fluorine-containing olefin compound is present in an amount of 0.1 to 5 parts by mass with respect to 100 parts by mass of the non-volatile matter content of the coating agent composition.

6. An antibacterial/antiviral member, comprising:

a substrate; and

a coating film which is provided on the substrate and contains the coating agent composition according to claim 1 .

7. An antibacterial/antiviral member, comprising:

a substrate; and

a coating film which is provided on the substrate, contains the coating agent composition according to claim 2 , and further, is cured by irradiating the coating agent composition with an ultraviolet ray or an electron beam.

8. The antibacterial/antiviral member according to claim 6 , wherein a film thickness of the coating film is 0.5 μm to 20 μm.