Polymer for optical film, and optical film including same

Patent metadata

Field	Value
Publication number	US-9562991-B2
Application number	US-201313962505-A
Country	US
Kind code	B2
Filing date	Aug 8, 2013
Priority date	Aug 9, 2012
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

Disclosed is a polymer comprising a repeating unit represented by Chemical Formula 1, or a polymer comprising a repeating unit represented by Chemical Formula 2:

wherein R 1 , R 2 , x and y are as defined herein.

First claim

What is claimed is:

1. An optical film consisting of a polymer consisting of a repeating unit represented by Chemical Formula 2:

wherein in Chemical Formula 2,
R 1 and R 2 are the same or different and are each independently hydrogen, a substituted or unsubstituted C1 to C10 aliphatic group, a substituted or unsubstituted C3 to C30 alicyclic group, or a substituted or unsubstituted C2 to C30 heterocyclic group;
wherein the aliphatic group, the alicyclic group, and the heterocyclic group are present singularly; or at least two of the alicyclic group, and the heterocyclic group are linked to provide a fused cyclic group; or at least two of the aliphatic group, the alicyclic group, and the heterocyclic group are linked via a single bond, or a functional group selected from —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p — (wherein 1≦p≦10), —(CF 2 ) q — (wherein 1≦q≦10), —C(CH 3 ) 2 —, —C(CF 3 ) 2 — and —C(═O)NH—; and
x and y are the same or different and are each an integer greater than 0; and
wherein the optical film has a short wavelength dispersion of an in-plane phase-difference value (450 nm/550 nm) being less than or equal to about 1.0, and a long wavelength dispersion of an in-plane phase-difference value (650 nm/550 nm) being greater than or equal to about 1.0.

2. The optical film of claim 1 , wherein R 1 and R 2 are the same or different and are each independently a C1 to C6 alkyl group, a C2 to C6 alkenyl group, or a C2 to C6 alkynyl group.

3. The optical film of claim 1 , wherein the ratio of x to y in Chemical Formula 2 is from about 0.1:99.9 to about 99.9:0.01.

4. The optical film of claim 1 , wherein the polymer has a number average molecular weight of about 10,000 grams per mole to about 500,000 grams per mole.

5. The optical film of claim 1 , wherein the polymer has a refractive index of about 1.40 to about 1.70.

6. The optical film of claim 1 , wherein the polymer has a glass transition temperature of about 80° C. to about 200° C.

7. The optical film of claim 1 , wherein the polymer has a polydispersity index of about 1.0 to about 5.0.

8. The optical film of claim 1 , wherein the film has a total light transmittance of greater than or equal to about 80% at a wavelength ranging from about 380 nm to about 750 nm.

9. The optical film of claim 1 , wherein the film is elongated at a range of 0≦[(film length after elongation−film length before elongation)/film length before elongation]×100≦200, at an elongation temperature in a range from 20° C. below the glass transition temperature of the polymer to 20° C. above the glass transition temperature of the polymer.

10. The optical film of claim 1 , wherein the film has an in-plane phase-difference value ranging from about 0 nanometers to about 200 nanometers at a wavelength of about 550 nanometers, and a thickness direction phase-difference value ranging from about 0 nanometer to about 500 nanometers at a wavelength of about 550 nanometers.

11. A display device comprising the optical film of claim 1 .

Assignees

• Samsung Electronics Co Ltd
• Cheil Ind Inc

Inventors

• Kim Hyung Jun
• Oh Kyoung Ah
• Lee Eun Kyung
• In Kyu Yeol
• Jung Myung Sup
• Jung Won-Cheol

Classifications

• C08F22/04

  Anhydrides, e.g. cyclic anhydrides · CPC title

• G02B1/00

  Optical elements characterised by the material of which they are made; Optical coatings for optical elements · CPC title

• G02B5/3083

  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) · CPC title

• G02B1/08 Primary

  made of polarising materials · CPC title

• C08L33/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers · CPC title