# US 9,829,617 B2 · Polymer-small molecule film or coating having reverse or flat dispersion of retardation

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- Number: US 9,829,617 B2
- Document ID: US9829617B2
- Status: Granted
- Kind: B2
- Application number: 14/590,511
- Filed: 2015-01-06
- Published: 2016-05-12
- Granted: 2017-11-28
- Earliest claimed: 2014-11-10
- Assignees: Light Polymers Holding
- Applicants: Light Polymers B.V.
- Inventors: Evgeny Morozov; Valeriy Kuzmin; Sergey Fedotov
- Web page: https://patentgrep.com/patent/US9829617B2

## CPC

- 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)}
- G02B 1/08: made of polarising materials
- C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K 2323/03: Viewing layer characterised by chemical composition
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The present disclosure relates to a retarder plate with adjustable dispersion of retardation. The retarder can form a quarter-wave plate that exhibits a reverse or flat dispersion of retardation.

## Claims

### Claim 1

A retarder comprising:
a layer having a thickness of less than 5 micrometers and comprising a mixture comprising birefringent small molecules and birefringent polymers having a weight ratio of birefringent polymer:birefringent small molecule in a range from 70:30 to 90:10, the birefringent polymers having an in-plane slow axis primarily in a first direction and the birefringent small molecules having an in-plane slow axis substantially orthogonal to the first direction; wherein:
the layer exhibits in-plane retardation values that vary by +/−5% or less in the entire wavelength range from 400 to 700 nanometers or the retarder exhibits an in-plane retardation that increases as a function of wavelength in a wavelength range of 400 to 700 nanometers; and
the mixture comprises the following birefringent small molecules of the following formula:
or salts thereof.

### Claim 2 (depends on 1)

The retarder according to claim 1, wherein the layer exhibits an in-plane retardation that increases as a function of wavelength for the entire wavelength range of 400 to 700 nanometers.

### Claim 3 (depends on 1)

The retarder according to claim 1, wherein the layer exhibits in-plane retardation values that vary by +/−3% or less in the entire wavelength range from 400 to 700 nanometers.

### Claim 4 (depends on 1)

The retarder according to claim 1, further comprising an isotropic substrate contacting the layer.

### Claim 5 (depends on 1)

The retarder according to claim 1, wherein the layer has a thickness in a range from 1 to 5 micrometers.

### Claim 6 (depends on 1)

The retarder according to claim 1, wherein the retarder is configured as an achromatic quarter-wave plate.

### Claim 7 (depends on 1)

The retarder according to claim 1, wherein at least some of the birefringent polymers have a formula:
wherein,
A is independently selected from SO3H or COOH, or their salt of an alkali metal, ammonium, quaternary ammonium, alkali earth metal, Al3+, La3+, Fe3+, Cr3+, Mn2+, Cu2+, Zn2+, Pb2+ or Sn2+; and
n is an integer from 10 to 10,000.

### Claim 8 (depends on 1)

The retarder according to claim 1, wherein at least some of the birefringent polymers have a formula:
or salt thereof,
wherein n is an integer in a range from 25 to 10,000.

### Claim 9 (depends on 1)

A multifunctional optical film comprising the retarder according to claim 1 disposed on a polarizer.

### Claim 10 (depends on 1)

An optical film stack comprising a polarizer, the retarder according to claim 1, and an optical film.

### Claim 11 (depends on 1)

A display comprising the retarder according to claim 1.

### Claim 12 (depends on 1)

The retarder according to claim 1, wherein the layer is disposed on an anisotropic substrate.

### Claim 13 (depends on 1)

The retarder according to claim 1, wherein the layer is disposed on a cyclic-olefin polymer (COP) substrate.