Polyamic acid, varnish comprising same and polyimide film
The present invention addresses the problem of providing: a polyimide film that has a small phase difference in the thickness direction and has a low coefficient of linear thermal expansion; and a polyamic acid and varnish to obtain the same. In order to solve this problem, the present invention provides a polyimide film which comprises polyimide that is produced by reacting a diamine component and a tetracarboxylic dianhydride component, the polyimide film having a coefficient of linear thermal expansion of 35 ppm/K or less over a temperature range of 100 to 200 DEG C, an absolute value of phase difference in the thickness direction of 200 nm or less per 10 μm thickness, a glass transition temperature of 260 DEG C or more, and a total light transmittance of 85% or more.
1. A polyimide film made of a polyimide obtained by reacting a diamine component with a tetracarboxylic dianhydride component,
wherein a coefficient of linear thermal expansion is 35 ppm/K or less throughout the range from 100° C. to 200° C.,
an absolute value of retardation in a thickness direction is 200 nm or less per thickness of 10 μm,
a glass transition temperature is 260° C. or higher, and
a total light transmittance is 85% or more;
wherein the diamine component includes 5 to 80 mol % based on the total amount of the diamine component of 1,5-diamino naphthalene represented by chemical formula (1), and
the tetracarboxylic dianhydride component includes 0 to 95 mol % based on the total amount of the tetracarboxylic dianhydride component of naphthalene 2,3,6,7-tetracarboxylic dianhydride represented by chemical formula (2A) and/or naphthalene 1,2,5,6-tetracarboxylic dianhydride represented by chemical formula (2B)
and
wherein the tetracarboxylic dianhydride component includes 5 to 50 mol % based on the total amount of the tetracarboxylic dianhydride component of fluorenylidene bis(phthalic anhydride) represented by chemical formula (4)
2. The polyimide film according to claim 1 ,
wherein the diamine component includes 0 to 50 mol % based on the total amount of the diamine component of 9,9-bis(4-aminophenyl)fluorene represented by chemical formula (3)
3. The polyimide film according to claim 1 , wherein the diamine component includes one or more compounds selected from the group consisting of 1,4-bis(aminomethyl)cyclohexane, bis(aminomethyl)norbornane, isophoronediamine, trans-1,4-diaminocyclohexane, and a hydrogenated product of 4,4′-diaminodiphenylmethane.
4. A polyamic acid obtained by reacting a diamine component with a tetracarboxylic dianhydride component,
wherein a coefficient of linear thermal expansion of a polyimide film obtained by imidizing the polyamic acid is 35 ppm/K or less throughout the range from 100° C. to 200° C.,
an absolute value of retardation in a thickness direction of the polyimide film is 200 nm or less per thickness of 10 μm,
a glass transition temperature of the polyimide film is 260° C. or higher, and
a total light transmittance is 85% or more;
wherein the diamine component includes 5 to 80 mol % based on the total amount of the diamine component of 1,5-diamino naphthalene represented by chemical formula (1), and
the tetracarboxylic dianhydride component includes 0 to 95 mol % based on the total amount of the tetracarboxylic dianhydride component of naphthalene 2,3,6,7-tetracarboxylic dianhydride represented by chemical formula (2A) and/or naphthalene 1,2,5,6-tetracarboxylic dianhydride represented by chemical formula (2B)
and
wherein the tetracarboxylic dianhydride component includes 5 to 50 mol % based on the total amount of the tetracarboxylic dianhydride component of fluorenylidene bis(phthalic anhydride) represented by chemical formula (4)
5. The polyamic acid according to claim 4 ,
wherein the diamine component includes 0 to 50 mol % based on the total amount of the diamine component of 9,9-bis(4-aminophenyl)fluorene represented by chemical formula (3)
6. The polyamic acid according to claim 4 , wherein the diamine component includes one or more compounds selected from the group consisting of 1,4-bis(aminomethyl)cyclohexane, bis(aminomethyl)norbornane, isophoronediamine, trans-1,4-diaminocyclohexane, and a hydrogenated product of 4,4′-diaminodiphenylmethane.
7. A polyamic acid varnish comprising the polyamic acid according to claim 4 .
8. A dry film comprising the polyamic acid according to claim 4 .
9. A polyimide obtained by curing the polyamic acid according to claim 4 .
10. A method of manufacturing a polyimide laminate in which a substrate and a polyimide layer are laminated, the method comprising:
coating a substrate with the polyamic acid varnish according to claim 7 ; and
heating a film of the coated polyamic acid varnish in an inert gas atmosphere.
11. A method of manufacturing a polyimide laminate in which a substrate and a polyimide layer are laminated, the method comprising:
coating a substrate with the polyamic acid varnish according to claim 7 ; and
heating a film of the coated polyamic acid varnish under an atmosphere of 15 kPa or less.
12. A polyimide film obtained by peeling off the substrate from the polyimide laminate obtained by the manufacturing method of claim 10 .
13. A method of manufacturing a display apparatus, comprising:
peeling off the substrate from the polyimide laminate obtained by the manufacturing method of claim 10 , thereby obtaining a polyimide film; and
forming a device on the polyimide film.
14. A method of manufacturing a display apparatus, comprising:
forming a device on the polyimide layer of the polyimide laminate obtained by the manufacturing method of claim 10 ; and
peeling off the polyimide layer on which the device is formed from the substrate.
15. A touch panel display obtained by the method of manufacturing the display apparatus according to claim 13 .
16. A liquid crystal display obtained by the method of manufacturing the display apparatus according to claim 13 .
17. An organic EL display obtained by the method of manufacturing the display apparatus according to claim 13 .
18. A touch panel display obtained by the method of manufacturing the display apparatus according to claim 14 .
19. A liquid crystal display obtained by the method of manufacturing the display apparatus according to claim 14 .
20. An organic EL display obtained by the method of manufacturing the display apparatus according to claim 14 .
21. A polyimide film obtained by peeling off the substrate from the polyimide laminate obtained by the manufacturing method of claim 11 .
22. A method of manufacturing a display apparatus, comprising:
peeling off the substrate from the polyimide laminate obtained by the manufacturing method of claim 11 , thereby obtaining a polyimide film; and
forming a device on the polyimide film.
23. A method of manufacturing a display apparatus, comprising:
forming a device on the polyimide layer of the polyimide laminate obtained by the manufacturing method of claim 11 ; and
peeling off the polyimide layer on which the device is formed from the substrate.
24. A touch panel display obtained by the method of manufacturing the display apparatus according to claim 22 .
25. A liquid crystal display obtained by the method of manufacturing the display apparatus according to claim 22 .
26. An organic EL display obtained by the method of manufacturing the display apparatus according to claim 22 .
27. A touch panel display obtained by the method of manufacturing the display apparatus according to claim 23 .
28. A liquid crystal display obtained by the method of manufacturing the display apparatus according to claim 23 .
29. An organic EL display obtained by the method of manufacturing the display apparatus according to claim 23 .
30. A touch panel display comprising the polyimide film according to claim 1 .
31. A liquid crystal display comprising the polyimide film according to claim 1 .
32. An organic EL display comprising the polyimide film according to claim 1 .