Composition for polarizing film, polarizing film, and display device

Patent metadata

Field	Value
Publication number	US-9927555-B2
Application number	US-201514681682-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Dec 26, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A composition for a polarizing film including a polymer and at least one of dichroic dye, wherein the dichroic dye includes a first dichroic dye represented by Chemical Formula 1 and having a molecular weight of greater than or equal to about 500 Daltons:

wherein in Chemical Formula 1, Ar 1 to Ar 3 , R 1 , R 2 , n, and m are the same as described in the detailed description.

First claim

What is claimed is:

1. A composition for a polarizing film, comprising:
a polymer and
at least one dichroic dye uniformly dispersed in the polymer,
wherein the polymer is a polyolefin, a polyamide, a polyester, a polyacrylate, a polystyrene, a copolymer thereof, or a combination thereof, having a haze of less than or equal to 2%, and a solubility parameter of 15 to 18,
wherein the dichroic dye comprises a first dichroic dye represented by Chemical Formula 1 and having a molecular weight of about 600 Daltons to about 1,000 Daltons and a solubility parameter of less than or equal to 20.9:

wherein, in Chemical Formula 1,
Ar 1 to Ar 3 are each independently a substituted or unsubstituted phenylene group,
R 1 is a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, or a combination thereof,
R 2 is hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, —NR 3 R 4 , or a combination thereof, wherein R 3 and R 4 are each independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, and wherein R 3 and R 4 are optionally linked to each other to form a ring, and
n is 0 or 1, and
m is 0,
wherein a solubility parameter difference between the polymer and the dichroic dye is less than 7.2, and
wherein a 30 μm-thick film formed from the composition, has a color shift (Δa*b*) of less than 2 upon standing at 85° C. for 250 hours.

2. The composition for a polarizing film of claim 1 , wherein
R 1 in Chemical Formula 1 is a substituted or unsubstituted C4 to C20 alkyl group or a substituted or unsubstituted C4 to C20 alkoxy group, and
R 2 in Chemical Formula 1 is hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, —NR 3 R 4 , or a combination thereof, wherein R 3 and R 4 are each independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, and wherein R 3 and R 4 are optionally linked to each other to form a ring.

3. The composition for a polarizing film of claim 1 , wherein the first dichroic dye has a maximum absorption wavelength λ max of about 380 nanometers to about 490 nanometers.

4. The composition for a polarizing film of claim 1 , wherein the dichroic dye further comprises a second dichroic dye having a maximum absorption wavelength λ max of greater than about 490 nanometers and less than or equal to about 580 nanometers, a third dichroic dye having a maximum absorption wavelength λ max of greater than about 580 nanometers and less than or equal to about 780 nanometers, or a combination thereof.

5. The composition for a polarizing film of claim 1 , wherein the polymer comprises polyethylene, polypropylene, polyethylene terephthalate, polyethylene terephthalate glycol, polyethylene naphthalate, nylon, a copolymer thereof, or a combination thereof.

6. The composition for a polarizing film of claim 1 , wherein an amount of the dichroic dye is about 0.01 to 5 parts by weight based on 100 parts by weight of the polymer.

7. A polarizing film comprising:
a polymer and
at least one dichroic dye uniformly dispersed in the polymer,
wherein the polymer is a polyolefin, a polyamide, a polyester, a polyacrylate, a polystyrene, a copolymer thereof, or a combination thereof, having a haze of less than or equal to 2%, and a solubility parameter of 15 to 18,
wherein the dichroic dye comprises a first dichroic dye represented by Chemical Formula 1 and having a molecular weight of about 600 Daltons to about 1,000 Daltons and a solubility parameter of less than or equal to 20.9:

wherein, in Chemical Formula 1,
Ar 1 to Ar 3 are each independently a substituted or unsubstituted phenylene group,
R 1 is a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, or a combination thereof,
R 2 is hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, —NR 3 R 4 , or a combination thereof, wherein R 3 and R 4 are each independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, and wherein R 3 and R 4 are optionally linked to each other to form a ring, and
n is 0 or 1, and
m is 0,
wherein a solubility parameter difference between the polymer and the dichroic dye is less than 7.2, and
wherein a color shift (Δa*b*) of the polarizing film is less than 2 upon standing at 85° C. for 250 hours, for a film thickness of 30 μm.

8. The polarizing film of claim 7 , wherein R 1 in Chemical Formula 1 is a substituted or unsubstituted C4 to C20 alkyl group or a substituted or unsubstituted C4 to C20 alkoxy group, and
R 2 in Chemical Formula 1 is hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, —NR 3 R 4 , or a combination thereof, wherein R 3 and R 4 are each independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, and wherein R 3 and R 4 are optionally linked to each other to form a ring.

9. The polarizing film of claim 7 , wherein the first dichroic dye has a maximum absorption wavelength λ max of about 380 nanometers to about 490 nanometers.

10. The polarizing film of claim 7 , wherein the dichroic dye further comprises a second dichroic dye having a maximum absorption wavelength λ max of greater than about 490 nanometers and less than or equal to about 580 nanometers, a third dichroic dye having a maximum absorption wavelength λ max of greater than about 580 nanometers and less than or equal to about 780 nanometers, or a combination thereof.

11. The polarizing film of claim 7 , wherein the polymer comprises polyethylene, polypropylene, polyethylene terephthalate, polyethylene terephthalate glycol, polyethylene naphthalate, nylon, a copolymer thereof, or a combination thereof.

12. The polarizing film of claim 7 , wherein
the polarizing film is a melt-blend of the polymer and the dichroic dye, and
an amount of the dichroic dye is about 0.01 to 5 parts by weight based on 100 parts by weight of the polymer.

13. A display device comprising:
a display panel and
a polarizing film of claim 7 disposed on at least one side of the display panel.

14. The display device of claim 13 , wherein the display panel is a liquid crystal panel or an organic light emitting panel.

Assignees

• Kim Ha Na
• Moon Deuk Kyu
• Lee Yong Joo
• Jeong Boreum
• Jung Myung Sup
• Samsung Electronics Co Ltd
• Samsung Sdi Co Ltd

Inventors

• Kim Ha Na
• Moon Deuk Kyu
• Lee Yong Joo
• Jeong Boreum
• Jung Myung Sup

Classifications

• G02B5/3033 Primary

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• Y10T428/1041

  Cross-Sectional Technologies · mapped topic

• G02B1/08 Primary

  made of polarising materials · CPC title

• G02F1/133533

  Colour selective polarisers (G02F1/1347 takes precedence) · CPC title

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title