# US 10,246,615 B2 · Ultraviolet-light-emitting device with adhesive having low glass transition temperature

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- Number: US 10,246,615 B2
- Document ID: US10246615B2
- Status: Granted
- Kind: B2
- Application number: 15/401,772
- Filed: 2017-01-09
- Published: 2017-04-27
- Granted: 2019-04-02
- Earliest claimed: 2014-07-15
- Assignees: AGC Inc.
- Applicants: AGC, Inc.
- Inventors: Fumiko Nakayama; Yoshihiko Sakane; Masahiro Ito; Yuki Hatanaka; Atsushi Koyanagi
- Web page: https://patentgrep.com/patent/US10246615B2

## CPC

- C09J 127/12: containing fluorine atoms
- C08F 8/12: Hydrolysis
- C08F 116/12: by an ether radical
- C08F 216/125: {Monomers containing two or more unsaturated aliphatic radicals, e.g. trimethylolpropane triallyl ether or pentaerythritol triallyl ether}
- C08F 216/14: Monomers containing only one unsaturated aliphatic radical
- C08F 216/1416: {Monomers containing oxygen in addition to the ether oxygen, e.g. allyl glycidyl ether}
- C09J 11/00: Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J 11/04: inorganic
- C09J 11/06: organic
- C09J 11/08: Macromolecular additives
- C09J 129/10: Homopolymers or copolymers of unsaturated ethers (C09J135/08 takes precedence)
- H10H 20/855: Optical field-shaping means, e.g. lenses
- C08K 3/04: Carbon
- C08K 2003/2241: {Titanium dioxide}
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2427/00: Presence of halogenated polymer
- H10H 20/0363: {of optical field-shaping means}
- H10H 20/825: containing nitrogen, e.g. GaN
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided is an adhesive for use in an ultraviolet-light-emitting device using ultraviolet light having a wavelength of from 200 to 400 nm as a light source, which can attach adherends made of a polymer having a fluorine-containing alicyclic structure with excellent adhesiveness which is unlikely to be impaired by exposure to such ultraviolet light or heat. An adhesive for forming an adhesive joint in an ultraviolet-light-emitting device, which is either the following adhesive (A) or the following adhesive (B) comprising a fluoropolymer having a fluorine-containing alicyclic structure: the adhesive (A): an adhesive in which the glass transition temperature of the fluoropolymer is from 30 to 100° C., and which does not contain an ultraviolet-shielding agent; and the adhesive (B): an adhesive comprising the fluoropolymer and an ultraviolet-shielding agent.

## Claims

### Claim 1

An adhesive for forming an adhesive joint in an ultraviolet-light-emitting device, which is either the following adhesive (A) or the following adhesive (B) comprising a fluoropolymer having a fluorine-containing alicyclic structure:
wherein:
the ultraviolet-light-emitting device comprises a light-emitting element generating ultraviolet light having a wavelength of from 200 to 400 nm, an optical member which transmits the ultraviolet light generated by the light-emitting element and the adhesive joint formed from the adhesive between the light-emitting element and the optical member, wherein the optical member is made of a fluoropolymer having a fluorine-containing alicyclic structure;
the adhesive (A) is an adhesive in which the glass transition temperature of the fluoropolymer is from 30 to 100° C., and which does not comprise an ultraviolet-shielding agent; and
the adhesive (B) is an adhesive comprising the fluoropolymer and an ultraviolet-shielding agent.

### Claim 2 (depends on 1)

The adhesive according to claim 1, which is the adhesive (B), wherein the glass transition temperature of the fluoropolymer in the adhesive (B) is from 30 to 100° C.

### Claim 3 (depends on 1)

The adhesive according to claim 1, which is the adhesive (B), wherein the adhesive (B) comprises the ultraviolet-shielding agent in an amount of from 0.1 to 20 mass % based on the fluoropolymer.

### Claim 4 (depends on 1)

The adhesive according to claim 1, wherein the ultraviolet-shielding agent comprises at least one kind selected from the group consisting of inorganic particles and organic particles.

### Claim 5 (depends on 1)

The adhesive according to claim 1, wherein the fluoropolymer has a reactive functional group in a side chain or at the end of the main chain and has no hydrogen atoms bonded to a carbon atom anywhere other than the reactive functional group.

### Claim 6 (depends on 1)

The adhesive according to claim 1, wherein the glass transition temperature of the fluoropolymer in the optical member is equal to or higher than the glass transition temperature of the fluoropolymer in the adhesive.

### Claim 7 (depends on 1)

The adhesive according to claim 1, wherein the glass transition temperature of the fluoropolymer in the optical member is 100 to 180° C.

### Claim 8 (depends on 1)

The adhesive according to claim 1, wherein the fluoropolymer having the fluorine-containing alicyclic structure has units (a) having the fluorine-containing alicyclic structure.

### Claim 9 (depends on 8)

The adhesive according to claim 8, wherein at least one of the ring-constituting carbon atoms in the fluorine-containing alicyclic ring is in the polymer main chain.

### Claim 10 (depends on 8)

The adhesive according to claim 8, wherein the units (a) have no hydrogen atoms bonded to a carbon atom.

### Claim 11 (depends on 8)

The adhesive according to claim 8, wherein the unit (a) is formed by cyclization polymerization of a fluorine-containing diene monomer.

### Claim 12 (depends on 8)

The adhesive according to claim 8, wherein the fluoropolymer having a glass transition temperature of from 30 to 100° C. comprises the units (a) and units (b) represented by the following formula (b), and the total content of the unit (a) and the units (b) is from 50 to 100 mol % based on the total of all units:
(wherein Rf is a perfluoroalkylene group which may have an ethereal oxygen atom, X is COOH, COOR, SO2F, SO3R or SO3H, and R is a C1-5 alkyl) group.

### Claim 13 (depends on 1)

The ultraviolet-light-emitting device comprising the light-emitting element generating ultraviolet light having the wavelength of from 200 to 400 nm and the optical member which transmits ultraviolet light having the wavelength of from 200 to 400 nm, wherein the light-emitting element and the optical member are bonded together by the adhesive joint formed from the adhesive according to claim 1.