OPTICAL FILM
First Claim
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1. An optical film which is made of a polycarbonate copolymer containing a unit (A) represented by the following formula:
- wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, “
m” and
“
n”
are each independently an integer of 0 to 4, and “
p” and
“
q”
are each independently an integer of 0 or more, and a unit (B) represented by the following formula;
wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A/B) molar ratio of the unit (A) to the unit (B) is 10/90 to 90/10 and which satisfies the following expression (1);
R(450)<
R(550)<
R(650)
(1)wherein R(450), R(550) and R(650) are retardation values within the plane of the film at wavelengths of 450 nm, 550 nm and 650 nm, respectively.
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Abstract
It is an object of the present invention to provide an optical film which has reverse chromatic dispersibility that its retardation becomes smaller as the wavelength becomes shorter and a low photoelastic constant.
The optical film is made of a polycarbonate copolymer containing a unit (A) represented by the following formula:
-
- wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms or the like, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms or the like, “m” and “n” are each independently an integer of 0 to 4, and “p” and “q” are each independently an integer of 0 or more,
and a unit (B) represented by the following formula:
- wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms or the like, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms or the like, “m” and “n” are each independently an integer of 0 to 4, and “p” and “q” are each independently an integer of 0 or more,
-
- wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms,
the (A/B) molar ratio of the unit (A) to the unit (B) is 10/90 to 90/10 and which satisfies the following expression (1):
- wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms,
R(450)<R(550)<R(650) (1)
- wherein R(450), R(550) and R(650) are retardation values within the plane of the film at wavelengths of 450 nm, 550 nm and 650 nm, respectively.
-
Citations
21 Claims
-
1. An optical film which is made of a polycarbonate copolymer containing a unit (A) represented by the following formula:
-
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, “
m” and
“
n”
are each independently an integer of 0 to 4, and “
p” and
“
q”
are each independently an integer of 0 or more,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A/B) molar ratio of the unit (A) to the unit (B) is 10/90 to 90/10 and which satisfies the following expression (1);
R(450)<
R(550)<
R(650)
(1)wherein R(450), R(550) and R(650) are retardation values within the plane of the film at wavelengths of 450 nm, 550 nm and 650 nm, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, and “
m” and
“
n”
are each independently an integer of 0 to 4,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A1/B) molar ratio of the unit (A1) to the unit (B) is 10/90 or more and less than 40/60, and the absolute value of photoelastic constant of the film is not more than 20×
10−
12 Pa−
1.
-
-
4. The film according to claim 3, wherein the polycarbonate copolymer contains a unit (A2) represented by the following formula:
-
and a unit (B1) represented by the following formula;
-
-
5. The film according to claim 2, wherein the polycarbonate copolymer contains a unit (A3) represented by the following formula:
-
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, “
m” and
“
n”
are each independently an integer of 0 to 4, and “
p” and
“
q”
are each independently an integer of 1 or more,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A3/B) molar ratio of the unit (A3) to the unit (B) is 10/90 or more and less than 65/35, and the absolute value of photoelastic constant of the film is not more than 25×
10−
12 Pa−
1.
-
-
6. The film according to claim 5, wherein the polycarbonate copolymer contains a unit (A4) represented by the following formula:
-
and a unit (B1) represented by the following formula;
-
-
7. The film according to claim 1 which satisfies the following expressions (4) to (6):
-
R(450)<
0
(4)
−
10<
R(550)<
10
(5)
0<
R(650)
(6).
-
-
8. The film according to claim 7, wherein the polycarbonate copolymer contains a unit (A1) represented by the following formula:
-
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, and “
m” and
“
n”
are each independently an integer of 0 to 4,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A1/B) molar ratio of the unit (A1) to the unit (B) is 40/60 or more and less than 60/40, and the absolute value of photoelastic constant of the film is not more than 25×
10−
12 Pa−
1.
-
-
9. The film according to claim 8, wherein the polycarbonate copolymer contains a unit (A2) represented by the following formula:
-
and a unit (B1) represented by the following formula;
-
-
10. The film according to claim 7, wherein the polycarbonate copolymer contains a unit (A3) represented by the following formula:
-
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, “
m” and
“
n”
are each independently an integer of 0 to 4, and “
p” and
“
q”
are each independently an integer of 1 or more,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A3/B) molar ratio of the unit (A3) to the unit (B) is 65/35 or more and less than 82/18, and the absolute value of photoelastic constant of the film is not more than 30×
10−
12 Pa−
1.
-
-
11. The film according to claim 10, wherein the polycarbonate copolymer contains a unit (A4) represented by the following formula:
-
and a unit (B1) represented by the following formula;
-
-
12. The film according to claim 1 which satisfies the following expression (7):
R(450)<
R(550)<
R(650)<
0
(7).
-
13. The film according to claim 12, wherein the polycarbonate copolymer contains a unit (A1) represented by the following formula:
-
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, and “
m” and
“
n”
are each independently an integer of 0 to 4,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A1/B) molar ratio of the unit (A1) to the unit (B) is 60/40 to 90/10, and the absolute value of photoelastic constant of the film is not more than 30×
10−
12 Pa−
1.
-
-
14. The film according to claim 13, wherein the polycarbonate copolymer contains a unit (A2) represented by the following formula:
-
and a unit (B1) represented by the following formula;
-
-
15. The film according to claim 12, wherein the polycarbonate copolymer contains a unit (A3) represented by the following formula:
-
wherein R1 and R2 are each independently a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, or halogen atom, R3 and R4 are each independently a hydrocarbon group having 1 to 10 carbon atoms which may contain an aromatic group, “
m” and
“
n”
are each independently an integer of 0 to 4, and “
p” and
“
q”
are each independently an integer of 1 or more,and a unit (B) represented by the following formula; wherein R5 to R8 are each independently a hydrogen atom or alkyl group having 1 to 10 carbon atoms, the (A3/B) molar ratio of the unit (A3) to the unit (B) is 82/18 to 90/10, and the absolute value of photoelastic constant of the film is not more than 30×
10−
12 Pa−
1.
-
-
16. The film according to claim 15, wherein the polycarbonate copolymer contains a unit (A4) represented by the following formula:
-
and a unit (B1) represented by the following formula;
-
-
17. The film according to claim 1, wherein the 5% weight loss temperature (Td) by heat of the polycarbonate copolymer is 380°
- C. or higher.
-
18. The film according to claim 1 which is a retardation film.
-
19. A liquid crystal display comprising the retardation film of claim 18.
-
20. A circularly polarizing film which comprises the film of claim 1 and a polarizing layer.
-
21. A display element comprising the circularly polarizing film of claim 20 as an antireflection film.
Specification