# US 2014/0153096 A1 · Resin composition, optical compensation film using the same and production method of optical compensation film

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- Number: US 2014/0153096 A1
- Document ID: US20140153096A1
- Status: Published application
- Kind: A1
- Application number: 14/235,948
- Filed: 2012-07-26
- Published: 2014-06-05
- Earliest claimed: 2011-07-29
- Assignees: Tosoh Corporation
- Inventors: Tohru Doi; Takahiro Kitagawa; Takashi Fukuda; Shinsuke Toyomasu
- Web page: https://patentgrep.com/patent/US20140153096A1

## CPC

- B29C 69/02: of moulding techniques only
- B29C 41/02: for making articles of definite length, i.e. discrete articles
- C08L 1/10: Esters of organic acids {, i.e. acylates}
- C08L 1/12: Cellulose acetate
- C08L 1/14: Mixed esters, e.g. cellulose acetate-butyrate
- C08L 35/02: Homopolymers or copolymers of esters (C08L35/06, C08L35/08 take precedence)
- G02B 1/041: {Lenses}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02F 1/133634: {the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

A resin composition containing a specific cellulose-based resin and a specific fumaric acid diester polymer in a specific blending ratio or containing, as the resin component, a specific cellulose-based resin and a specific fumaric acid diester polymer in a specific blending ratio and containing the resin component and an additive having an aromatic hydrocarbon ring or the like in a specific blending ratio. An optical compensation film can be produced using the resin composition.

## Claims

### Claim 1

A resin composition, comprising:
from 10 to 99 wt % of a cellulose-based resin of formula (1); and
from 90 to 1 wt % of a fumaric acid diester polymer comprising 60 mol % or more of a fumaric acid diester residue unit of formula (2):
wherein R1, R2 and R3 are each independently hydrogen or an acyl group having a carbon number of from 1 to 12, and
wherein ach of R4 and R5 are each independently an alkyl group having a carbon number of from 1 to 12.

### Claim 2

A resin composition, comprising:
from 70 to 99.99 wt % of a resin component; and
from 0.01 to 30 wt % of an additive comprising an aromatic hydrocarbon ring or aromatic heterocyclic ring,
wherein the resin component consists of:
from 10 to 99 wt % of a cellulose-based resin of formula (1); and
from 90 to 1 wt % of a fumaric acid diester polymer comprising 60 mol % or more of a fumaric diester residue unit of formula (2):
wherein R1, R2 and R3 are each independently hydrogen or an acyl group having a carbon number of from 1 to 12; and
wherein R4 and R5 are each independently an alkyl group having a carbon number of from 1 to 12.

### Claim 3 (depends on 1)

The resin composition according to claim 1,
wherein an acylation degree of the cellulose-based resin of formula (1) is from 1.5 to 3.0.

### Claim 4 (depends on 1)

The resin composition according to claim 1,
wherein the fumaric acid diester polymer comprises:
from 60 to 95 mol % of a diisopropyl fumarate residue unit; and
from 5 to 40 mol % of a fumaric acid diester residue unit selected from the group consisting of a diethyl fumarate residue unit, a di-n-propyl fumarate residue unit, a di-n-butyl fumarate residue unit and a di-2-ethylhexyl fumarate residue unit.

### Claim 5 (depends on 2)

The resin composition according to claim 2,
wherein the additive comprising an aromatic hydrocarbon ring or aromatic heterocyclic ring has a birefringence Δn of formula (5) of 0.05 or more:
Δn=ny−nx (5)
wherein nx is a refractive index in a fast axis direction of the additive molecule and ny is a refractive index in a slow axis direction of the additive molecule.

### Claim 6 (depends on 2)

The resin composition according to claim 2,
wherein the additive comprising an aromatic hydrocarbon ring or aromatic heterocyclic ring comprises from 1 to 12 aromatic hydrocarbon rings or aromatic heterocyclic rings in a molecule.

### Claim 7 (depends on 1)

An optical compensation film, comprising the resin composition according to claim 1.

### Claim 8 (depends on 7)

The optical compensation film according to claim 7,
wherein a thickness of the film is from 5 to 200 μm.

### Claim 9 (depends on 2)

An optical condensation film, comprising the resin composition according to claim 2 and having a thickness of from 5 to 200 μm.

### Claim 10 (depends on 7)

The optical compensation film according to claim 7,
wherein an in-plane retardation of formula (2) is from 80 to 300 nm and an Nz coefficient of formula (3) is from 0.35 to 0.65:
Re=(ny−nx)×d (2)
Nz=(ny−nz)/(ny−nx) (3)
wherein nx is a refractive index in a fast axis direction in a film plane, ny is a refractive index in a slow axis direction in a film plane, nz is a refractive index in an out-of-film plane direction, and d is a film thickness.

### Claim 11 (depends on 7)

The optical compensation film according to claim 7,
wherein an in-plane retardation (Re) of formula (2) is from 50 to 200 nm and an Nz coefficient of formula (3) is from −0.2 to 0.2:
Re=(ny−nx)−d (2)
Nz=(ny−nz)/(ny−nx) (3)
wherein nx is a refractive index in a fast axis direction in a film plane, ny is a refractive index in a slow axis direction in a film plane, nz is a refractive index in an out-of-film plane direction, and d is a film thickness.

### Claim 12 (depends on 7)

The optical compensation film according to claim 7,
wherein an in-plane retardation (Re) of formula (2) is from 0 to 20 nm and an out-of-plane retardation (Rth) of formula (4) is from −150 to 10 nm:
Re=(ny−nx)×d (2)
Rth=[(nx+ny)/2−nz]×d (4)
wherein nx is a refractive index in a fast axis direction in a film plane, ny is a refractive index in a slow axis direction in a film plane, nz is a refractive index in an out-of-film plane direction, and d is a film thickness.

### Claim 13 (depends on 7)

The optical compensation film according to claim 7,
wherein a light transmittance of the film is 85% or more.

### Claim 14 (depends on 7)

The optical compensation film according to claim 7,
wherein a haze of the film is 2% or less.

### Claim 15 (depends on 7)

A method for producing the optical compensation film according to claim 7, comprising:
dissolving from 10 to 99 wt % of a cellulose-based resin of formula (1) and from 90 to 1 wt % of a fumaric acid diester polymer comprising 60 mol % or more of a fumaric acid diester residue unit of formula (2) in a solvent;
casting an obtained resin solution on a base material; and
after drying, separating a resulting film from the base material:
wherein R1, R2 and R3 are each independently hydrogen or an acyl group having a carbon number of from 1 to 12; and
wherein R4 and R5 are each independently an alkyl group having a carbon number of from 1 to 12.

### Claim 16 (depends on 9)

A method for producing the optical compensation film according to claim 9, comprising:
dissolving from 70 to 99 wt % of a resin component and from 0.01 to 30 wt % of an additive comprising an aromatic hydrocarbon ring or aromatic heterocyclic ring in a solvent;
casting an obtained resin solution on a base material; and
after drying, separating a resulting film from the base material,
wherein the resin component consists of:
from 10 to 99 wt % of a cellulose-based resin of formula (1); and
from 90 to 1 wt % of a fumaric acid diester polymer comprising 60 mol % or more of a fumaric acid diester residue unit of formula (2):
wherein R1, R2 and R3 are each independently hydrogen or an acyl group having a carbon number of from 1 to 12; and
wherein R4 and R5 are each independently an alkyl group having a carbon number of from 1 to 12.

### Claim 17 (depends on 15)

The method according to claim 15,
wherein an acylation degree of the cellulose-based resin of formula (1) is from 1.5 to 3.0.

### Claim 18 (depends on 15)

The method according to claim 15,
wherein the fumaric acid diester polymer comprises: from 60 to 95 mol % of a diisopropyl fumarate residue unit; and from 5 to 40 mol % of a fumaric acid diester residue unit selected from the group consisting of a diethyl fumarate residue unit, a di-n-propyl fumarate residue unit, a di-n-butyl fumarate residue unit and a di-2-ethylhexyl fumarate residue unit.

### Claim 19 (depends on 10)

A method for producing the optical compensation film according to claim 10,
comprising stretching a film obtained by casting at least in a uniaxial direction.

### Claim 20 (depends on 10)

A method for producing the optical compensation film according to claim 10,
comprising uniaxially stretching or unbalanced biaxially stretching a film having a thickness of 40 to 200 μm obtained by casting.

### Claim 21 (depends on 11)

A method for producing the optical compensation film according to claim 11, comprising stretching a film obtained by casting at least in a uniaxial direction.

### Claim 22 (depends on 11)

A method for producing the optical compensation film according to claim 11,
comprising uniaxially stretching or unbalanced biaxially stretching a film having a thickness of 40 to 200 μm obtained by casting.