Patent ID: 11873419
Assignee: KIA CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 3:
4. A polyurethane-silica composite film comprising:
a polyurethane film; and
a silica layer formed on the polyurethane film, wherein the silica layer comprises amphiphilic silica nanoparticles that are fluorine-amine surface-treated amphiphilic silica particles having (i) a fluorine functional group introduced in a first surface treatment and (ii) an amine functional group introduced in a second surface treatment, and with a relatively large amount of fluorine functional group compared to amine functional group,
wherein the fluorine-amine surface-treated amphiphilic silica particles are used to form an uneven surface structure on the film surface through phase separation in the polyurethane-silica composite film, and
wherein the polyurethane-silica composite film comprises the amphiphilic silica nanoparticles in an amount of 0.3 wt % to 10.7 wt % based on the total weight of the polyurethane-silica composite film.