Resin composition, cured film, method for producing cured film, and display device
Provided is a resin composition which contains a UV absorbent having high solubility in solvents, and imparts superior UV-cut performance and transparency, and good weather resistance, even when being formed as a thin film. The resin composition contains a UV absorbent (a) and a resin (b), wherein the UV absorbent (a) contains at least two compounds, i.e., a compound (a-1) having a global absorption maximum at less than 340 nm, and a compound (a-2) having a global absorption maximum at 340-380 nm, and the total content of (a-1) and (a-2) is 10-30 mass % of the total solid content.
1. A resin composition comprising:
(a) an ultraviolet radiation absorbing agent; and
(b) an acrylic resin,
the ultraviolet radiation absorbing agent comprising at least two species as follows:
(a-1) a compound having a greatest absorption maximum below 340 nm; and
(a-2) a compound having a greatest absorption maximum at 340 to 380 nm,
wherein the compound of (a-2) comprises a compound represented by general formula (1) and a sum content of (a-1) and (a-2) is 10 to 30 mass % of a total amount of solid content,
wherein R 1 to R 3 each independently is a hydrocarbon group having a carbon number of 1 to 10, and
wherein a double bond equivalent of the (b) acrylic resin is in a range of 700 to 2,300 g/mol.
2. The resin composition according to claim 1 , wherein a mass ratio between the content of the compound of (a-1) and the content of the compound of (a-2) is in a range of (a-1):(a-2)=1:1 to 1:10.
3. The resin composition according to claim 1 , wherein the (b) resin has a carboxyl group.
4. The resin composition according to claim 1 , further comprising (c) a compound having an alkoxy methyl group or a methylol group.
5. The resin composition according to claim 4 , wherein the (c) compound having an alkoxy methyl group or a methylol group has a group represented by general formula (2):
—N—(CH 2 OR 4 ) x (H) y (2)
wherein:
R 4 is a hydrogen atom or a univalent hydrocarbon group having a carbon number of 1 to 6,
x is 1 or 2,
y is 0 or 1, and
x+y is 2.
6. The A resin composition comprising:
(a) an ultraviolet radiation absorbing agent;
(b) a resin; and
(c) a compound having an alkoxy methyl group or a methylol group,
the ultraviolet radiation absorbing agent comprising at least two species as follows:
(a-1) a compound having a greatest absorption maximum below 340 nm; and
(a-2) a compound having a greatest absorption maximum at 340 to 380 nm,
wherein the compound of (a-2) comprises a compound represented by general formula (1) and a sum content of (a-1) and (a-2) is 10 to 30 mass % of a total amount of solid content,
wherein R 1 to R 3 each independently is a hydrocarbon group having a carbon number of 1 to 10 and
wherein based on the total amount of solid content:
the (a-1) compound is present in an amount of 1 to 10 mass %;
the (a-2) compound is present in an amount of 7 to 25 mass %;
the (b) resin is present in an amount of 50 to 85 mass %; and
the (c) compound is present in an amount of 0.5 to 15 mass %.
7. A cured film provided by curing the resin composition according to claim 1 .
8. The cured film according to claim 7 , whose average transmittance values satisfy all of (I) to (III) as follows:
(I) an average transmittance value in a wavelength range of 300 to 360 nm is 0.1 to 5%;
(II) an average transmittance value in a wavelength range of 360 to 380 nm is 1 to 30%; and
(III) an average transmittance value in a wavelength range of 400 to 500 nm is 90 to 100%.
9. The cured film according to claim 8 , whose film thickness is 0.5 to 5 μm.
10. A production method for a cured film in which the cured film is formed by applying the resin composition according to claim 1 onto a substrate and performing a heating treatment at 100 to 250° C.
11. A display device comprising the cured film according to claim 7 .
12. A cover glass comprising the cured film according to claim 7 .
13. A color filter comprising the cured film according to claim 7 .
14. A touch panel comprising the cured film according to claim 7 .
15. A cured film provided by curing the resin composition according to claim 6 .
16. A production method for a cured film in which the cured film is formed by applying the resin composition according to claim 6 onto a substrate and performing a heating treatment at 100 to 250° C.
17. A display device comprising the cured film according to claim 15 .
18. A cover glass comprising the cured film according to claim 15 .
19. A color filter comprising the cured film according to claim 15 .
20. A touch panel comprising the cured film according to claim 15 .