# US 10,309,008 B2 · Window film and preparation method thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,309,008 B2
- Document ID: US10309008B2
- Status: Granted
- Kind: B2
- Application number: 15/532,456
- Filed: 2014-12-24
- Published: 2017-09-21
- Granted: 2019-06-04
- Earliest claimed: 2014-12-03
- Assignees: Zhangjiagang Kangde Xin Optronics Material Co., Ltd.
- Applicants: Zhangjiagang Kangde Xin Optronics Material Co., Ltd.
- Inventors: Yuchun Zhang; Minghong Hsu
- Web page: https://patentgrep.com/patent/US10309008B2

## CPC

- C23C 14/352: {using more than one target (C23C14/56 takes precedence)}
- B32B 9/04: comprising such {particular} substance as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00)}
- B32B 15/04: comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)}
- B32B 15/043: {of metal (B32B15/01 takes precedence)}
- C23C 14/083: {of refractory metals or yttrium}
- C23C 14/086: {of zinc, germanium, cadmium, indium, tin, thallium or bismuth}
- C23C 14/185: {by cathodic sputtering}
- C23C 14/205: {by cathodic sputtering}
- C23C 14/3457: {using other particles than noble gas ions (C23C14/0036, C23C14/46 take precedence)}
- C23C 14/542: {Controlling the film thickness or evaporation rate}
- B32B 2311/08: Silver
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A window film is disclosed. The window film includes: a flexible transparent base material; a first metal target material film, disposed on the surface of the flexible transparent base material; a first high refractive index compound film, disposed on the surface of the first metal target material film; a first metal oxide film, disposed on the surface of the first high refractive index compound film; a first silver-containing metal film, disposed on the surface of the first metal oxide film; a second metal target material film, disposed on the surface of the first silver-containing metal film; and a second high refractive index compound film, disposed on the surface of the second metal target material film. The window film has better adherence, and is less likely to peel off. In addition, the window film also has better oxidation resistance, and is less likely to be oxidized. Furthermore, the window film also has a better optical effect and heat insulation effect.

## Claims

### Claim 1

A window film comprising:
a flexible transparent base material, the flexible transparent base material serving as a substrate;
a first metal target material film, disposed on a surface of the flexible transparent base material;
a first high refractive index compound film, disposed on a surface of the first metal target material film, a refractive index of the first high refractive index compound film ranging from 2.0 to 2.5;
a first metal oxide film, disposed on a surface of the first high refractive index compound film, a material of the first metal oxide film being selected from a transition metal oxide or a tin oxide;
a first silver-containing metal film, disposed on a surface of the first metal oxide film;
a second metal target material film, disposed on a surface of the first silver-containing metal film; and
a second high refractive index compound film, disposed on a surface of the second metal target material film, a refractive index of the second high refractive index compound film ranging from 2.0 to 2.5.

### Claim 2 (depends on 1)

The window film of claim 1, further comprising:
a second metal oxide film, disposed on a surface of the second high refractive index compound film, the second metal oxide film being made from a transition metal oxide or a tin oxide;
a second silver-containing metal film, disposed on a surface of the second metal oxide film;
a third metal target material film, disposed on a surface of the second silver-containing metal film; and
a third high refractive index compound film, disposed on a surface of the third metal target material film, a refractive index of the third high refractive index compound film ranging from 2.0 to 2.5.

### Claim 3 (depends on 1)

The window film of claim 1, wherein a thickness of the flexible transparent base material ranges from 20 microns to 30 microns.

### Claim 4 (depends on 1)

The window film of claim 1, wherein a material of the first metal target material film and a material of the second metal target material film are independently selected from Zn, Ti, Cu, Ni, NiCr or Cr.

### Claim 5 (depends on 1)

The window film of claim 1, wherein a thickness of the first metal target material film and a thickness of the second metal target material film independently range from 0.2 nm to 0.8 nm.

### Claim 6 (depends on 1)

The window film of claim 1, wherein the refractive index of the first high refractive index compound film and the refractive index of the second high refractive index compound film independently range from 2.2 to 2.3.

### Claim 7 (depends on 1)

The window film of claim 1, wherein a material of the first high refractive index compound film and a material of the second high refractive index compound film are independently selected from Nb2O5, ITO, Si3N4, SnO2, TiO2 or TaO2.

### Claim 8 (depends on 1)

The window film of claim 1, wherein a thickness of the first high refractive index compound film ranges from 22 nm to 30 nm.

### Claim 9 (depends on 2)

The window film of claim 2, wherein the material of the second metal oxide film and the first metal oxide film are independently selected from zinc oxides, tin oxides or Aluminum-doped Zinc Oxides.

### Claim 10 (depends on 1)

The window film of claim 1, wherein a thickness of the second metal oxide film and the first metal oxide film independently range from 1 nm to 5 nm.

### Claim 11 (depends on 1)

The window film of claim 1, wherein a material of the first silver-containing metal film is selected from silver or a silver alloy.

### Claim 12 (depends on 1)

The window film of claim 1, wherein a thickness of the first silver-containing metal film ranges from 5 nm to 12 nm.

### Claim 13 (depends on 1)

The window film of claim 1, wherein a thickness of the second high refractive index compound film ranges from 22 nm to 27 nm.

### Claim 14 (depends on 2)

The window film of claim 2, wherein a thickness of the third high refractive index compound film ranges from 20 nm to 30 nm.

### Claim 15 (depends on 1)

The window film of claim 1, wherein the Visible Light Transmittance of the window film within a range of 380 nm to 780 nm is greater than 72%, and the Infrared Light Transmittance of the window film within a range of 780 nm to 2,500 nm is less than 10%.

### Claim 16

A preparation method for a window film, comprising:
1) magnetron-sputtering a first metal target material onto a surface of a flexible transparent base material, and obtaining a first metal target material film disposed on the surface of the flexible transparent base material;
2) magnetron-sputtering a first high refractive index compound onto a surface of the first metal target material film, and obtaining a first high refractive index compound film disposed on the surface of the first metal target material film, a refractive index of the first high refractive index compound ranging from 2.0 to 2.5;
3) magnetron-sputtering a first metal oxide onto a surface of the first high refractive index compound film, and obtaining a first metal oxide film disposed on the surface of the first high refractive index compound film, the first metal oxide being selected from a transition metal oxide or a tin oxide;
4) magnetron-sputtering first silver-containing metal onto a surface of the first metal oxide film, and obtaining a first silver-containing metal film disposed on the surface of the first metal oxide film;
5) magnetron-sputtering a second metal target material onto a surface of the first silver-containing metal film, and obtaining a second metal target material film disposed on the surface of the first silver-containing metal film; and
6) magnetron-sputtering a second high refractive index compound onto a surface of the second metal target material film, and obtaining a window film, a refractive index of the second high refractive index compound ranging from 2.0 to 2.5.