# US 11,993,058 B2 · Electrochromic films with edge protection

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- Number: US 11,993,058 B2
- Document ID: US11993058B2
- Status: Granted
- Kind: B2
- Application number: 18/326,866
- Filed: 2023-05-31
- Published: 2023-09-28
- Granted: 2024-05-28
- Earliest claimed: 2018-11-14
- Assignees: Furcifer Inc.
- Applicants: Furcifer Inc.
- Inventors: Zhao Chen; Jian Wang; Yan Zhou
- Web page: https://patentgrep.com/patent/US11993058B2

## CPC

- B32B 17/10: of synthetic resin
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10211: {Doped dielectric layer, electrically conductive, e.g. SnO2:F}
- B32B 17/10302: {Edge sealing}
- B32B 17/10513: {Electrochromic layer}
- B32B 17/10761: {containing vinyl acetal}
- G02F 1/1508: {using a solid electrolyte}
- G02F 1/1533: {structural features not otherwise provided for}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present application discloses a method for preparing an electrochromic device. The method includes placing an edge protection material on a first and second substrates, placing a first and second interlayers respectively within the edge protection material on the first and second substrates, wherein the edge protection material surrounds edges of the first and second interlayers, and interposing an electrochromic film between the first and second interlayers. The edge protection material prevents chemicals in the first and second interlayers from entering into the electrochromic film.

## Claims

### Claim 1

An electrochromic device comprising:
a first portion comprising:
a first substrate; and
a first interlayer disposed on the first substrate;
a second portion disposed on the first portion, the second portion comprising:
a second substrate; and
a second interlayer disposed on the second substrate;
an electrochromic film disposed between the first interlayer and the second interlayer; and
an edge protection seal disposed between the first substrate and the second substrate and around the first interlayer and the second interlayer, wherein
the first interlayer is narrower than the first substrate,
the second interlayer is narrower than the second substrate,
the edge protection seal covers a portion of inner surface of the first substrate that does not overlap with the first interlayer,
the edge protection seal further covers side surfaces of the first interlayer and the second interlayer, without covering side surfaces of the first substrate and the second substrate, and
the edge protection seal is electrically conductive and functioning as electrodes of the electrochromic film.

### Claim 2 (depends on 1)

The device of claim 1, wherein the electrochromic film comprises:
an electrochromic layer deposited with an electrochromic seal;
a charge storage layer; and
a solid polymer electrolyte disposed between the electrochromic layer and the charge storage layer.

### Claim 3 (depends on 2)

The device of claim 2, wherein the solid polymer electrolyte comprises an electrolyte salt and a polymer matrix.

### Claim 4 (depends on 2)

The device of claim 2, wherein the electrochromic film further comprises an electrode layer including tin doped indium oxide (ITO).

### Claim 5 (depends on 1)

The device of claim 1, wherein:
the edge protection seal comprises a plurality of stripes of edge seal.

### Claim 6 (depends on 5)

The device of claim 5, wherein:
the first plurality of stripes of edge seal comprise four stripes of edge seal disposed at and sealing four edges of the first interlayer; and
the second plurality of stripes of edge seal comprise four stripes of edge seal disposed at and sealing four edges of the second interlayer.

### Claim 7 (depends on 1)

The device of claim 1, wherein the first portion and second portion are disposed symmetrically with respect to the electrochromic film.

### Claim 8 (depends on 1)

The device of claim 1, wherein the electrochromic film is in direct contact with the first interlayer and the second interlayer.

### Claim 9 (depends on 1)

The device of claim 1, wherein the first interlayer and the second interlayer directly press against the electrochromic film.

### Claim 10 (depends on 1)

The device of claim 1, wherein the edge protection seal comprises epoxy.

### Claim 11 (depends on 1)

The device of claim 1, wherein the edge protection seal includes polyvinyl siloxane (PVS), thermoplastic polyurethane (TPU), or ethylene-vinyl acetate (EVA).

### Claim 12 (depends on 1)

The device of claim 1, wherein the first interlayer and the second interlayer are made from polyvinyl butyral (PVB).

### Claim 13 (depends on 1)

The device of claim 1, wherein the edge protection seal is resistant to chemicals from the first and the second interlayers.

### Claim 14 (depends on 1)

The device of claim 1, wherein the first substrate and the second substrate are glass panels.