CN-122029488-A - Photosensitive coloring composition, cured product, partition wall, organic electroluminescent element, color filter, and image display device

Abstract

The invention provides a photosensitive coloring composition with excellent substrate adhesion. The photosensitive coloring composition comprises (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a photopolymerizable compound, and (E) a photopolymerization initiator, wherein the (B) dispersant comprises a copolymer (B1), the copolymer (B1) has (B1-1) structural units with specific structures, and (B1-2) structural units with at least one structural unit of tertiary amino groups and quaternary ammonium groups.

Inventors

• HAYAKAWA KAZUHIRO
• TOSHIMITSU ERIKO
• RIKITAKE NOBUO
• IMAI NAOAKI

Assignees

• 三菱化学株式会社

Dates

Publication Date

20260512

Application Date

20241017

Priority Date

20231018

Claims (15)

1. 1. A photosensitive coloring composition for forming a partition wall, which comprises (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a photopolymerizable compound, and (E) a photopolymerization initiator, The content of the colorant (A) is 15 mass% or less relative to the total solid component amount of the photosensitive coloring composition, The dispersant (B) contains a copolymer (B1) having at least the following structural units (B1-1) and (B1-2), (B1-1) a structural unit represented by the following general formula (B1-1), (B1-2) a structural unit having at least one of a tertiary amino group and a quaternary ammonium group, [ Chemical formula 1] In the formula (B1-1), R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 each independently represent an alkylene group having 1 to 8 carbon atoms which may be substituted, n represents an integer of 1 to 10, * Representing a bond.
2. 2. A photosensitive coloring composition, characterized by comprising (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a photopolymerizable compound, and (E) a photopolymerization initiator, wherein, The (A) colorant contains C.I. pigment Violet 29, The dispersant (B) contains a copolymer (B1) having at least the following structural units (B1-1) and (B1-2), (B1-1) a structural unit represented by the following general formula (B1-1), (B1-2) a structural unit having at least one of a tertiary amino group and a quaternary ammonium group, [ Chemical formula 2] In the formula (B1-1), R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 each independently represent an alkylene group having 1 to 8 carbon atoms which may be substituted, n represents an integer of 1 to 10, * Representing a bond.
3. 3. A photosensitive coloring composition, characterized by comprising (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a photopolymerizable compound, and (E) a photopolymerization initiator, wherein, The dispersant (B) contains a copolymer (B1) having at least the following structural units (B1-1) and (B1-2), The photosensitive coloring composition is used for forming a partition wall with a height of more than 5 mu m, (B1-1) a structural unit represented by the following general formula (B1-1), (B1-2) a structural unit having at least one of a tertiary amino group and a quaternary ammonium group, [ Chemical formula 3] In the formula (B1-1), R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 each independently represent an alkylene group having 1 to 8 carbon atoms which may be substituted, n represents an integer of 1 to 10, * Representing a bond.
4. 4. The photosensitive coloring composition according to any one of claim 1 to 3, wherein, The copolymer (B1) further has the following structural units (B1-3), (B1-3) structural units represented by the following general formula (B1-3), [ Chemical formula 4] In the formula (B1-3), R 11 represents a hydrogen atom or a methyl group, R 12 represents an ethylene group or a propylene group, R 13 represents an optionally substituted alkyl group, m represents an integer of 1 to 20, and x represents a bond.
5. 5. The photosensitive coloring composition according to claim 4, wherein, The content of the (B1-3) structural unit is 20 to 500 mol% based on 100 mol% of the (B1-1) structural unit in the copolymer (B1).
6. 6. The photosensitive coloring composition according to any one of claim 1 to 3, wherein, The structural unit (B1-2) in the copolymer (B1) comprises at least one of a structural unit represented by the following general formula (B1-2-1) and a structural unit represented by the following general formula (B1-2-2), [ Chemical formula 5] In formula (B1-2-1), R 21 represents a hydrogen atom or a methyl group, R 22 and R 23 each independently represent a hydrogen atom, an optionally substituted alkyl group, an optionally substituted aryl group or an optionally substituted aralkyl group, Z 1 represents a divalent linking group, represents a bond, [ Chemical formula 6] In the formula (B1-2-2), R 24 represents a hydrogen atom or a methyl group, R 25 ～R 27 each independently represents a hydrogen atom, an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted aralkyl group, X 1 represents a divalent linking group, Y - represents a counter anion, and X represents a bond.
7. 7. The photosensitive coloring composition according to any one of claim 1 to 3, wherein, The copolymer (B1) comprises a block copolymer.
8. 8. The photosensitive coloring composition according to any one of claim 1 to 3, wherein, The photosensitive coloring composition further contains a compound having a crosslinking group and having a fluorine atom and/or a siloxane chain.
9. 9. The photosensitive coloring composition according to any one of claim 1 to 3, wherein, The photosensitive coloring composition further contains a solvent.
10. 10. The photosensitive coloring composition according to any one of claim 1 to 3, wherein, The photosensitive coloring composition is used for firing at 140 ℃ or below.
11. 11. A cured product obtained by curing the photosensitive coloring composition according to any one of claims 1 to 3.
12. 12. A partition wall composed of the cured product according to claim 11.
13. 13. An organic electroluminescent element provided with the partition wall according to claim 12.
14. 14. A color filter provided with the partition wall according to claim 12, and further comprising luminescent nano-crystal grains.
15. 15. An image display device provided with the partition wall according to claim 12.

Description

Photosensitive coloring composition, cured product, partition wall, organic electroluminescent element, color filter, and image display device Technical Field The present invention relates to a photosensitive coloring composition. The present invention also relates to a cured product obtained by curing the photosensitive coloring composition, a partition wall composed of the cured product, an organic electroluminescent element including the partition wall, a color filter, and an image display device. The present application claims priority based on 2023, 10 and 18 in japanese patent application No. 2023-179679 of japanese application, and the contents thereof are incorporated herein. Background In recent years, in order to reduce power consumption and widen a color gamut of a display, a color filter in which pixels are formed using luminescent nano-crystal grains such as quantum dots has been studied. Among the methods for producing color filters, there are photolithography and inkjet methods, and the latter method is known to reduce the loss of ink material (for example, refer to patent document 1). In the case of manufacturing a color filter including luminescent nanocrystals by an inkjet method, an ink including luminescent nanocrystals is ejected to a region (pixel portion) surrounded by a partition wall manufactured in advance to form a pixel. In addition, an organic electroluminescent element used for an organic electroluminescent display or the like is manufactured by forming a barrier rib (bank) on a substrate, and laminating various functional layers in a region surrounded by the barrier rib. Among methods for stacking functional layers in the partition walls, an inkjet method is known. As a resin composition for forming the partition wall, a photosensitive resin composition containing a photopolymerizable compound, a photopolymerization initiator, an alkali-soluble resin, and a liquid repellent agent is known (for example, refer to patent document 2). Further, a colored resin composition having a low contact angle with water and good coating unevenness by using a specific dispersant (for example, refer to patent document 3), a block copolymer having good dispersibility, developability and dry resolubility, and a pigment dispersion composition containing the same are known (for example, refer to patent document 4). Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2019-086755 Patent document 2 International publication No. 2022/264909 Patent document 3 Japanese patent application laid-open No. 2018-132554 Patent document 4 Japanese patent application laid-open No. 2013-119568 Disclosure of Invention Problems to be solved by the invention However, the photosensitive resin composition described in patent document 2 and the cured product thereof have insufficient adhesion to the substrate. In the compositions described in patent documents 3 and 4, the problem of substrate adhesion does not occur because the film thickness is low. Accordingly, an object of the present invention is to provide a photosensitive coloring composition having excellent adhesion to a substrate. The present invention also provides a cured product obtained by curing the photosensitive coloring composition having excellent adhesion to a substrate, a partition wall composed of the cured product, an organic electroluminescent element including the partition wall, a color filter including the partition wall, and an image display device including the partition wall. Solution for solving the problem As a result of intensive studies, the present inventors have found that the above problems can be solved by using a dispersant having a specific structure in a photosensitive coloring composition, and have completed the present invention. Namely, the gist of the present invention is as follows. The present invention has the following scheme. [1] A photosensitive coloring composition for forming a partition wall, which comprises (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a photopolymerizable compound, and (E) a photopolymerization initiator, The content of the colorant (A) is 15% by mass or less relative to the total solid content of the photosensitive coloring composition, and the dispersant (B) contains a copolymer (B1) having at least the following (B1-1) structural unit and (B1-2) structural unit. Structural units represented by the following general formula (B1-1). (B1-2) a structural unit having at least one of a tertiary amino group and a quaternary ammonium group. [ Chemical formula 1] In the formula (B1-1), R 1 represents a hydrogen atom or a methyl group, and R 2 and R 3 each independently represent an alkylene group having 1 to 8 carbon atoms which may be substituted. n represents an integer of 1 to 10. * Representing a bond. [2] A photosensitive coloring composition, characterized by comprising (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin,