Composition for polarizing film, polarizing film, and display device including the polarizing film
A composition for a polarizing film, including a polyolefin and a dichroic dye represented by Chemical Formula 1: wherein in Chemical Formula 1, groups and variables are the same as defined in the detailed description.
1. A composition for a polarizing film, comprising
a polyolefin and
a dichroic dye represented by Chemical Formula 1:
wherein, in Chemical Formula 1,
EWG is a halogen, C(═O)R, C(═O)OR′, a haloalkyl group, C(═O)Cl, CN, SO 3 R″, or NO 2 , wherein R, R′, and R″ are a C1 to C30 alkyl group,
Ar 1 is a C6 to C12 arylene group or a C4 to C12 heteroarylene group,
Ar 2 is a C12 to C20 arylene group or a C4 to C20 heteroarylene group,
R 1 and R 2 are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, a substituted or unsubstituted C2 to C20 alkenyl group, or a substituted or unsubstituted C2 to C20 alkynyl group, provided that at least one of R 1 and R 2 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, a substituted or unsubstituted C2 to C20 alkenyl group, or a substituted or unsubstituted C2 to C20 alkynyl group,
R 3 and R 4 are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, or a substituted or unsubstituted C1 to C20 alkylthio group,
m and n are integers of 1 or 2,
R 1a is hydrogen or a substituted or unsubstituted C1 to C30 alkyl group,
provided that R 1 , R 1a , and R 2 are not simultaneously hydrogen,
provided that a+p, q, and r do not exceed bonding valence of the phenylene group, Ar 1 and Ar 2 , respectively, and
R 5 and R 6 are independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, wherein R 5 and R 6 are optionally linked to each other to provide a ring.
2. The composition for a polarizing film of claim 1 , wherein the R 1 and R 2 are a substituted or unsubstituted C5 to C30 alkyl group, a substituted or unsubstituted C5 to C20 alkoxy group, a substituted or unsubstituted C5 to C20 alkylthio group, a substituted or unsubstituted C5 to C20 alkenyl group, or a substituted or unsubstituted C5 to C20 alkynyl group.
3. The composition for a polarizing film of claim 1 , wherein Ar 1 is a phenylene group or a naphthylene group.
4. The composition for a polarizing film of claim 1 , wherein the Ar 2 is a naphthylene group or an anthracenylene group.
5. The composition for a polarizing film of claim 1 , wherein the dichroic dye is represented by Chemical Formula 2:
wherein, in Chemical Formula 2,
EWG is a halogen, C(═O)R, C(═O)OR′, a haloalkyl group, C(═O)Cl, CN, SO 3 R″, or NO 2 , wherein R, R′, and R″ are a C1 to C30 alkyl group,
R 1 and R 2 are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, a substituted or unsubstituted C2 to C20 alkenyl group, or a substituted or unsubstituted C2 to C20 alkynyl group, provided that at least one of R 1 and R 2 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylthio group, a substituted or unsubstituted C2 to C20 alkenyl group, or a substituted or unsubstituted C2 to C20 alkynyl group,
R 3 and R 4 are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, or a substituted or unsubstituted C1 to C20 alkylthio group,
m and n are integers of 1 or 2,
R 1a to R 1c are independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group,
provided that R 1 , R 1a , R 2 , and R 1b are not simultaneously hydrogen, p, q, r, a, b, and c are each an integer of 0 to 2,
provided that a+p, q+b do not exceed bonding valence of the corresponding phenylene group, and r+c does not exceed bonding valence of the naphthylene group, and
R 5 and R 6 are independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, wherein R 5 and R 6 are optionally linked to each other to provide a ring.
6. The composition for a polarizing film of claim 5 , wherein the R 1 and R 2 are independently a substituted or unsubstituted C5 to C30 alkyl group, a substituted or unsubstituted C5 to C20 alkoxy group, a substituted or unsubstituted C5 to C20 alkylthio group, a substituted or unsubstituted C5 to C20 alkenyl group, or a substituted or unsubstituted C5 to C20 alkynyl group.
7. The composition for a polarizing film of claim 1 , wherein the dichroic dye has a decomposition temperature of greater than or equal to about 245° C.
8. The composition for a polarizing film of claim 1 , wherein the polyolefin has a melting point of less than or equal to about 300° C.
9. The composition for a polarizing film of claim 1 , wherein the polyolefin comprises polyethylene, polypropylene, a copolymer thereof, or a combination thereof.
10. The composition for a polarizing film of claim 1 , wherein the polyolefin has a melt flow index of about 1 gram per 10 minutes to about 15 grams per 10 minutes.
11. The composition for a polarizing film of claim 1 , wherein the polypropylene has a melt flow index of about 0.1 grams per 10 minutes to 5 grams per 10 minutes, and
the polyethylene-polypropylene copolymer has a melt flow index of about 5 grams per 10 minutes to about 15 grams per 10 minutes.
12. The composition for a polarizing film of claim 1 , wherein the polyolefin is a mixture of polypropylene and a polyethylene-polypropylene copolymer, and the polyethylene-polypropylene copolymer comprises about 1 to about 50 percent by weight of the polyethylene.
13. The composition for a polarizing film of claim 1 , wherein the polyolefin comprises polypropylene and a polyethylene-polypropylene copolymer in a weight ratio of about 1:9 to about 9:1.
14. The composition for a polarizing film of claim 1 , wherein an amount of the dichroic dye is about 0.01 to about 5 parts by weight based on 100 parts by weight of the polyolefin.
15. The composition for a polarizing film of claim 14 , wherein an amount of the dichroic dye is about 0.05 to 1 part by weight based on 100 parts by weight of the polyolefin.
16. The composition for a polarizing film of claim 1 , which has a solid content of greater than or equal to about 90 percent by weight.
17. The composition for a polarizing film of claim 1 , which does not comprise a solvent.
18. A polarizing film comprising a molten mixture of the composition for a polarizing film of claim 1 .
19. The polarizing film of claim 18 , which has a dichroic ratio of about 3 to about 10 in a wavelength region of greater than or equal to about 600 nanometers.
20. The polarizing film of claim 18 , wherein the dichroic dye is dispersed in the polyolefin, and
the polyolefin is elongated in a uniaxial direction at an elongation rate of about 400 to about 1,000%.
21. A display device comprising the polarizing film of claim 18 .