# US 11,078,314 B2 · Fluorine-containing copolymer, composition for forming film, and optical film

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- Number: US 11,078,314 B2
- Document ID: US11078314B2
- Status: Granted
- Kind: B2
- Application number: 16/564,549
- Filed: 2019-09-09
- Published: 2019-12-26
- Granted: 2021-08-03
- Earliest claimed: 2017-03-28
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Reiko Fukagawa; Miho Asahi
- Web page: https://patentgrep.com/patent/US11078314B2

## CPC

- C08F 214/184: {with fluorinated vinyl ethers}
- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- C08F 220/22: Esters containing halogen
- C08J 5/18: Manufacture of films or sheets
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 1/18: Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence)
- C08J 2301/12: Cellulose acetate
- C08J 2433/04: esters
- G02B 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)}
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A copolymer includes a repeating unit of Formula (I) and a repeating unit of Formula (II), a composition includes the copolymer, and an optical film has a layer formed of the composition, in the Formulae (I) and (II), R1 and R2 represent a hydrogen atom or an alkyl group, L3 and L1 represent a divalent linking group, L2 represents a single bond or a divalent linking group, and L4 represents a single bond or a divalent linking group, L4 does not represent a linking group including —O(C═O)—NH—, X represents a perfluoropolyether group, an alkyl group having a branched structure in which hydrogen is all substituted into fluorine, an alkenyl group, or an alkynyl group, and Y represents a crosslinking group.

## Claims

### Claim 1

A fluorine-containing copolymer comprising:
a repeating unit represented by General Formula (I); and a repeating unit represented by General Formula (II),
in General Formula (I), R1 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, L1 represents a divalent linking group including at least one selected from the group consisting of —O—, —(C═O)O—, —O(C═O)—, —(C═O)—NH—, —NH—(C═O)—, a divalent aromatic group, or a divalent alicyclic group, L2 represents a single bond or a divalent linking group, and X is represented by General Formula (III) or General Formula (IV),
in General Formulae (III) and (IV), * represents a bonding site to L2 in General Formula (I),
in General Formula (II), R2 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, L3 represents a divalent linking group including at least one selected from the group consisting of —O—, —(C═O)O—, —O(C═O)—, —(C═O)—NH—, —NH—(C═O)—, a divalent aromatic group, or a divalent alicyclic group, L4 represents a single bond, an alkylene group having 1 to 20 carbon atoms, an alkenylene group having 1 to 20 carbon atoms, a divalent aromatic group, —O—, —(C═O)O—, —O(C═O)—, —(C═O)—NH—, —NH—(C═O)—, or a divalent linking group consisting of a combination of the above-described bond or groups; however, L4 does not represent a linking group including —O(C═O)—NH—, and Y is an acryloyloxy group, a methacryloyloxy group, or an acryloylamino group,
wherein a weight average molecular weight is 1,000 to 100,000.

### Claim 2 (depends on 1)

The fluorine-containing copolymer according to claim 1,
wherein L1 in General Formula (I) and L3 in General Formula (II) each are represented by any of —(C═O)O—, —O(C═O)—, and —(C═O)—NH—.

### Claim 3 (depends on 1)

A composition for forming a film comprising:
the fluorine-containing copolymer according to claim 1.

### Claim 4 (depends on 3)

The composition for forming a film according to claim 3, further comprising:
a curable compound having a plurality of crosslinking groups in a molecule.

### Claim 5 (depends on 3)

The composition for forming a film according to claim 3, further comprising:
particles.

### Claim 6 (depends on 3)

An optical film comprising:
a film that is formed of the composition for forming a film according to claim 3.

### Claim 7 (depends on 5)

An optical film comprising:
a film that is formed of the composition for forming a film according to claim 5,
wherein the optical film has a protrusion and recess structure on a surface.