Polarizing film having specified zero shear viscosity and yield stress and display device including the same
A polarizing film includes a high-temperature elongation film of a polyolefin and a dichroic dye, and the polyolefin has zero shear viscosity (η 0 ) ranging from about 2600 Pa·s to about 17400 Pa·s at a temperature of about 210° C. (±3° C.).
1. A polarizing film comprising a high-temperature elongation film comprising:
a polyolefin and
a dichroic dye,
wherein the polyolefin has a zero shear viscosity (η 0 ) ranging from about 2600 Pa·s to about 17400 Pa·s at a temperature of about 210° C. (±3° C.), and the polyolefin has a yield stress ranging from about 2600 Pa to about 8700 Pa.
2. The polarizing film of claim 1 , wherein the polyolefin has a zero shear viscosity ranging from about 2600 Pa·s to about 12000 Pa·s at a temperature of about 210° C. (±3° C.).
3. The polarizing film of claim 1 , wherein the polyolefin has a zero shear viscosity ranging from about 2600 Pa·s to about 8500 Pa·s at a temperature of about 210° C. (±3° C.).
4. The polarizing film of claim 1 , wherein the polyolefin has a complex viscosity (η*, Pa·s) satisfying Equation 1:
2600
1
+
(
k
1
ω
)
m
1
≤
η
*
≤
17400
1
+
(
k
2
ω
)
m
2
Equation
1
wherein, in Equation 1,
ω is a numeral value of an angular frequency of a rotational rheometer,
k 1 is a constant of about 0.108 to about 0.132,
k 2 is a constant of about 0.738 to about 0.902,
m 1 ranges from about 0.477 to about 0.583, and
m 2 ranges from about 0.522 to about 0.638.
5. The polarizing film of claim 1 , wherein the polyolefin has a complex viscosity (η*, Pa·s) satisfying Equation 1-1:
2600
1
+
(
k
1
ω
)
m
1
≤
η
*
≤
12000
1
+
(
k
2
ω
)
m
2
Equation
1-1
wherein, in Equation 1-1,
ω is a numeral value of an angular frequency of a rotational rheometer,
k 1 is a constant of about 0.108 to about 0.132,
k 2 is a constant of about 1.071 to about 1.309,
m 1 ranges from about 0.477 to about 0.583, and
m 2 ranges from about 0.468 to about 0.572.
6. The polarizing film of claim 1 , wherein the polyolefin has a complex viscosity (η*, Pa·s) satisfying Equation 1-2:
2600
1
+
(
k
1
ω
)
m
1
≤
η
*
≤
8500
1
+
(
k
2
ω
)
m
2
Equation
1-2
wherein, in Equation 1-2,
ω is a numeral value of an angular frequency of a rotational rheometer,
k 1 is a constant of about 0.108 to about 0.132,
k 2 is a constant of about 0.603 to about 0.737,
m 1 ranges from about 0.477 to about 0.583, and
m 2 ranges from about 0.54 to about 0.66.
7. The polarizing film of claim 1 , wherein the polyolefin has a yield stress ranging from about 2691 Pa to about 8681 Pa.
8. The polarizing film of claim 1 , wherein the polyolefin comprises polypropylene, a polyethylene copolymer, a polypropylene copolymer, a polyethylene-polypropylene copolymer, or a combination thereof.
9. The polarizing film of claim 1 , wherein
the polyolefin is a mixture of polypropylene (PP) and a polyethylene-polypropylene (PE-PP) copolymer, and
the polyethylene and polypropylene (PE-PP) copolymer comprises ethylene in an amount of about 1 to about 50 wt %, based on the total weight of the copolymer.
10. The polarizing film of claim 1 , wherein the polyolefin has a melt flow index (MFI) ranging from about 3 g/10 min to about 11 g/10 min.
11. The polarizing film of claim 9 , wherein the polypropylene (PP) has a melt flow index (MFI) ranging from about 3 g/10 min to about 10 g/10 min, and the polyethylene-polypropylene copolymer (PE-PP) has a melt flow index (MFI) of about 5 g/10 min to about 16 g/10 min.
12. The polarizing film of claim 9 , wherein the polyolefin comprises the polypropylene and the polyethylene-polypropylene copolymer in a weight ratio of about 1:9 to about 9:1.
13. The polarizing film of claim 1 , wherein the dichroic dye is dispersed into the polyolefin, and the polyolefin is elongated in a uniaxial direction about 400% to about 1300%.
14. The polarizing film of claim 1 , which has haze of less than or equal to about 5%.
15. The polarizing film of claim 14 , which has haze ranging from about 0.5% to about 3.5%.
16. The polarizing film of claim 1 , wherein the polarizing film has a dichroic ratio ranging from about 2 to about 14 in a visible ray wavelength region ranging from about 380 nm to about 780 nm.
17. The polarizing film of claim 1 , wherein the dichroic dye is present in an amount of about 0.1 to about 10 parts by weight based on 100 parts by weight of the polyolefin.
18. The polarizing film of claim 17 , wherein the dichroic dye is present in an amount of about 0.5 to about 5 parts by weight based on 100 parts by weight of the polyolefin.
19. The polarizing film of claim 1 , wherein the polarization film has polarization efficiency of greater than or equal to about 95%.
20. The polarizing film of claim 19 , wherein the polarization film has polarization efficiency of about 95% to about 99.9%.
21. An anti-reflective film comprising:
the polarizing film of claim 1 , and
a phase retardation film.
22. A display device comprising the polarizing film according to claim 20 .
23. A display device comprising the anti-reflective film according to claim 21 .
24. A composition for a polarizing film comprising
a polyolefin and a dichroic dye,
wherein the polyolefin has zero shear viscosity (η 0 ) ranging from about 2600 Pa·s to about 17400 Pa·s at a temperature of about 210° C. (±3° C.), and the polyolefin has a yield stress ranging from about 2600 Pa to about 8700 Pa.
25. The composition of claim 24 , wherein the polyolefin has zero shear viscosity ranging from about 2600 Pa·s to about 8500 Pa·s at a temperature of about 210° C. (±3° C.).
26. The composition of claim 24 , wherein the polyolefin has complex viscosity (η*, Pa·s) satisfying Equation 1:
2600
1
+
(
k
1
ω
)
m
1
≤
η
*
≤
17400
1
+
(
k
2
ω
)
m
2
Equation
1
wherein, in Equation 1,
ω is a numeral value of an angular frequency of a rotational rheometer,
k 1 is a constant of about 0.108 to about 0.132,
k 2 is a constant of about 0.738 to about 0.902,
m 1 ranges from about 0.477 to about 0.583, and
m 2 ranges from about 0.522 to about 0.638.
27. The composition of claim 24 , wherein the polyolefin has complex viscosity (η*, Pa·s) satisfying Equation 1-1:
2600
1
+
(
k
1
ω
)
m
1
≤
η
*
≤
12000
1
+
(
k
2
ω
)
m
2
Equation
1-1
wherein in Equation 1-1,
ω is a numeral value of an angular frequency of a rotational rheometer,
k 1 is a constant of about 0.108 to about 0.132,
k 2 is a constant of about 1.071 to about 1.309,
m 1 ranges from about 0.477 to about 0.583, and
m 2 ranges from about 0.468 to about 0.572.
28. The composition of claim 24 , wherein the polyolefin has complex viscosity (η*, Pa·s) satisfying Equation 1-2:
2600
1
+
(
k
1
ω
)
m
1
≤
η
*
≤
8500
1
+
(
k
2
ω
)
m
2
[
Equation
1-2]
wherein, in Equation 1-2,
ω is a numeral value of an angular frequency of a rotational rheometer,
k 1 is a constant of about 0.108 to about 0.132,
k 2 is a constant of about 0.603 to about 0.737,
m 1 ranges from about 0.477 to about 0.583, and
m 2 ranges from about 0.54 to about 0.66.
29. The composition of claim 24 , wherein the polyolefin has yield stress ranging from about 2691 Pa to about 8681 Pa.
30. The composition of claim 24 , wherein the polyolefin comprises polypropylene, a polyethylene copolymer, a polypropylene copolymer, a polyethylene-polypropylene copolymer, or a combination thereof.
31. The composition of claim 30 , wherein the polyolefin is a mixture of polypropylene (PP) and a polyethylene-polypropylene (PE-PP) copolymer,
wherein the polyethylene and polypropylene (PE-PP) copolymer comprises ethylene in an amount of about 1 to about 50 wt % based on the weight of the copolymer.
32. The composition of claim 24 , wherein the polyolefin has a melt flow index (MFI) ranging from about 3 g/10 min to about 11 g/10 min.
33. The composition of claim 31 , wherein the polypropylene (PP) has a melt flow index (MFI) ranging from about 3 g/10 min to 10 g/10 min, and
the polyethylene-polypropylene copolymer (PE-PP) has a melt flow index (MFI) ranging from about 5 g/10 min to about 16 g/10 min.
34. The composition of claim 24 , which has a solid content of greater than or equal to about 90 wt %.
35. The composition of claim 24 , which contains no solvent.