# US 11,440,296 B2 · Laminated glass intermediate film and laminated glass

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- Number: US 11,440,296 B2
- Document ID: US11440296B2
- Status: Granted
- Kind: B2
- Application number: 16/975,217
- Filed: 2019-02-27
- Published: 2020-12-17
- Granted: 2022-09-13
- Earliest claimed: 2018-02-27
- Assignees: Sekisui Chemical Co., Ltd.
- Applicants: Sekisui Chemical Co., Ltd.
- Inventors: Shougo Yoshida; Hajime Shouhi
- Web page: https://patentgrep.com/patent/US11440296B2

## CPC

- B32B 17/10678: {comprising UV absorbers or stabilizers, e.g. antioxidants}
- B32B 17/10: of synthetic resin
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10504: {Liquid crystal layer}
- B32B 17/10513: {Electrochromic layer}
- B32B 17/10743: {containing acrylate (co)polymers or salts thereof}
- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10788: {containing ethylene vinylacetate}
- C08K 5/005: {Stabilisers against oxidation, heat, light, ozone}
- C08K 5/07: Aldehydes; Ketones
- C08K 5/103: with polyalcohols
- C08K 5/3475: condensed with carbocyclic rings
- B32B 2307/40: having particular optical properties
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

An interlayer film for a laminated glass according to the present invention comprises a benzotriazole-based compound having a maximum absorption wavelength peak of 370 nm or more and 405 nm or less, and has a transmittance difference represented by T1000−T0 of less than 2.0%, wherein T1000 represents a transmittance at 400 nm after being irradiated with xenon light having an irradiance of 180 w/m2 for 1000 hours at a black panel temperature of 83° C., a temperature in a chamber of 50° C., and a humidity in a chamber of 50% RH, and T0 represents a transmittance at 400 nm before being irradiated.

## Claims

### Claim 1

An interlayer film for a laminated glass comprising a benzotriazole-based compound having a maximum absorption wavelength peak of 370 nm or more and 405 nm or less, and having a transmittance difference represented by T1000-T0 of less than 2.0%, wherein T1000 represents a transmittance at 400 nm after being irradiated with xenon light having an irradiance of 180 w/m2 for 1000 hours at a black panel temperature of 83° C., a temperature in a chamber of 50° C., and a humidity in a chamber of 50% RH, and T0 represents a transmittance at 400 nm before being irradiated,
wherein the interlayer film further comprises a compound which is represented by a following formula (3):
in the formula (3), R21 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxycarbonylalkyl group having 4 to 20 carbon atoms; R22 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and X is a chlorine atom or a hydrogen atom.

### Claim 2 (depends on 1)

The interlayer film for a laminated glass according to claim 1, wherein the transmittance difference is −0.4% or more.

### Claim 3 (depends on 1)

The interlayer film for a laminated glass according to claim 1, further comprising a thermoplastic resin.

### Claim 4 (depends on 1)

The interlayer film for a laminated glass according to claim 1, comprising at least one selected from the group consisting of a polyvinyl acetal resin and an ethylene-vinyl acetate copolymer resin.

### Claim 5 (depends on 1)

The interlayer film for a laminated glass according to claim 1, further comprising a polyvinyl acetal resin and a plasticizer.

### Claim 6 (depends on 1)

The interlayer film for a laminated glass according to claim 1, further comprising an ultraviolet absorber having a maximum absorption wavelength peak of 330 nm or more and less than 370 nm.

### Claim 7 (depends on 1)

The interlayer film for a laminated glass according to claim 1, wherein the benzotriazole-based compound is a compound represented by the following formula (1),
wherein
R10 represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms which optionally has a hetero atom;
R11 to R15 each independently represent a hydrogen atom, a hydroxyl group, a sulfo group, or a hydrocarbon group having 1 to 30 carbon atoms which optionally has a hetero atom; and
at least one of R11 to R15 represents a hydroxyl group.

### Claim 8 (depends on 1)

The interlayer film for a laminated glass according to claim 1, wherein a content of the benzotriazole-based compound is 0.005 to 0.2% by mass.

### Claim 9 (depends on 1)

The interlayer film for a laminated glass according to claim 1, wherein the transmittance T0 at 400 nm before being irradiated is 7.0% or less.

### Claim 10 (depends on 1)

Laminated glass comprising:
two glass plates; and
the interlayer film for a laminated glass according to claim 1 disposed between the two glass plates.

### Claim 11 (depends on 10)

The laminated glass according to claim 10, wherein the laminated glass does not include a light control body.