Fluororesin film

1. A fluororesin film, comprising:

a fluororesin film body which contains hydrophobized silicon oxide-coated metal oxide particles obtained by a process comprising the following steps (a) to (d) and a fluororesin, and

a coating film in direct contact with the fluororesin film body and made of a coating film-forming composition containing at least one resin selected from the group consisting of a polyester, acryl polyol, acryl resin, acryl urethane resin, acryl silicone resin, vinyl acetate resin and a fluororesin, formed on one side of the fluororesin film body:

(a) adding at least one silicon oxide precursor selected from the group consisting of tetramethoxysilane, tetraethoxysilane, tetra n-propoxysilane and tetraisopropoxysilane to a dispersion of metal oxide particles to form a silicon oxide layer on the surface of the metal oxide particles to obtain a dispersion of silicon oxide-coated metal oxide particles;

(b) adding a compound represented by the following formula (1) and at least one silicon oxide precursor selected from the group consisting of tetramethoxysilane, tetraethoxysilane, tetra n-propoxysilane and tetraisopropoxysilane, to the dispersion of silicon oxide-coated metal oxide particles, to obtain a dispersion of primarily hydrophobized silicon oxide-coated metal oxide particles,

R 1 4-n Si(OR 2 ) n   (1)

wherein R 1 is a C 1-9 alkyl group, R 2 is an alkyl group, and n is an integer of from 1 to 3;

(c) adding a silanol-protecting agent to the dispersion of primarily hydrophobized silicon oxide-coated metal oxide particles to obtain a dispersion of secondarily hydrophobized silicon oxide-coated metal oxide particles, wherein the silanol-protective agent is a compound represented by the following formula (2 a ):

R 3 3 Si—NH—SiR 3 3   (2 a )

wherein

each R 3 is, independently, a C 1-2 alkyl group; and

(d) drying the secondarily hydrophobized silicon oxide-coated metal oxide particles to obtain hydrophobized silicon oxide-coated metal oxide particles.

2. The fluororesin film according to claim 1 , wherein the metal oxide particles are zinc oxide particles.

3. The fluororesin film according to claim 1 , wherein the silanol-protective agent is hexamethyldisilazane.

4. The fluororesin film according to claim 1 , wherein the coating film-forming composition further contains a pigment or dye.

5. The fluororesin film according to claim 1 , wherein the coating film made of a coating film-forming composition is a printing layer comprising a printing ink, or an adhesive layer comprising an adhesive.

6. The fluororesin film according to claim 1 , wherein the transmittance of light at 360 nm of the fluororesin film body is at most 5%, and the haze of the fluororesin film body as measured by a haze meter according to JIS K7105 is at most 15%.

7. The fluororesin film according to claim 1 , wherein the fluororesin is an ethylene/tetrafluoroethylene copolymer.

8. The fluororesin film according to claim 1 , wherein the resin is a polyester.

9. The fluororesin film according to claim 1 , wherein the resin is a acryl polyol.

10. The fluororesin film according to claim 1 , wherein the resin is an acryl resin.

11. The fluororesin film according to claim 1 , wherein the resin is an acryl urethane resin.

12. The fluororesin film according to claim 1 , wherein the resin is an acryl silicone resin.

13. The fluororesin film according to claim 1 , wherein the resin is a vinyl acetate resin.

14. The fluororesin film according to claim 1 , wherein the resin is a fluororesin.