Thermosetting coloring composition and method of producing color filter for solid-state imaging element

Patent metadata

Field	Value
Publication number	US-10915028-B2
Application number	US-201816033236-A
Country	US
Kind code	B2
Filing date	Jul 12, 2018
Priority date	Jan 14, 2016
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A thermosetting coloring composition for manufacturing a color filter for a solid-state imaging element provided with a colored pattern formed by patterning a colored layer by dry etching is provided. The composition contains a pigment (A), a dispersant (B), a thermosetting compound (C), and a solvent (D). A ratio of the pigment (A) to a total solid content of the thermosetting coloring composition is 50 mass percent or more. The dispersant (B) contains a dispersant (b1) having an acidic functional group and/or a dispersant (b2) having a basic functional group. The thermosetting compound (C) contains a glycidyl therified epoxy compound of sorbitol.

First claim

The invention claimed is:

1. A thermosetting coloring composition for manufacturing a color filter for a solid-state imaging element provided with a colored pattern formed by patterning a colored layer by dry etching, the composition comprising:
a pigment (A), a dispersant (B), a thermosetting compound (C), and a solvent (D),
wherein a ratio of the pigment (A) to a total solid content of the themiosetting coloring composition is 50 mass percent or more, the dispersant (B) comprises a dispersant (b1) having an acidic functional group, and the thermosetting compound (C) comprises a glycidyl etherified epoxy compound of sorbitol,
wherein the dispersant (b1) having the acidic functional group has a segment (b1-A) obtained by polymerizing an ethylenic unsaturated monomer comprising (meth)acrylate, and a theoretical value of a glass transition temperature of the segment (b1-A) is 40° C. or higher.

2. The thermosetting coloring composition according to claim 1 , wherein the pigment (A) comprises a green pigment (a1).

3. The thermosetting coloring composition according to claim 2 , wherein the green pigment comprises at least one selected from the group consisting of Pigment Green 7, Pigment Green 36, and Pigment Green 58.

4. The thermosetting coloring composition according to claim 1 , wherein the solvent (D) comprises a solvent (d1) having a boiling point of 160° C. or higher.

5. The thermosetting coloring composition according to claim 4 , wherein the solvent (d1) having a boiling point of 160° C. or higher is cyclohexanol acetate.

6. The thermosetting coloring composition according to claim 1 , wherein the acidic functional group is an aromatic carboxyl group.

7. The thermosetting coloring composition according to claim 1 , wherein the theoretical value of the glass transition temperature of the segment (b1-A) is 80° C. or higher.

8. A method of manufacturing a color filter for a solid-state imaging element, the method comprising:
(X) forming a colored layer using the thermosetting coloring composition according to claim 1 ; and
(Y) patterning the colored layer by dry etching.

9. The method according to claim 8 ,
wherein (X) includes (X-1) forming a coating film comprising the thermosetting coloring composition, and (X-2) thermally curing the coating film to obtain the colored layer, and
(Y) includes (Y-1) forming a photoresist layer on the colored layer, (Y-2) patterning the photoresist layer by performing exposure and development to obtain a resist pattern, (Y-3) patterning the colored layer by dry etching using the resist pattern as an etching mask to form a colored pattern, and (Y-4) bringing a stripping liquid into contact with the resist pattern to remove the resist pattern from the colored pattern.

10. The method according to claim 9 , wherein the stripping liquid comprises at least one selected from the group consisting of N-methylpyrrolidone, dimethylsulfoxide, and monoethanolamine.

11. The thermosetting coloring composition according to claim 1 , wherein the dispersant (B) further comprises a dispersant (b2) having a basic functional group.

Assignees

• Toyo Ink Sc Holdings Co Ltd
• Toyocolor Co Ltd
• Toppan Printing Co Ltd

Inventors

• Hiki Kenji
• Imoto Tomohiro
• Takahashi Satoshi

Classifications

• H10F39/8053 Primary

  Colour filters · CPC title

• H10F39/024

  of coatings or optical elements · CPC title

• C09D7/45

  Anti-settling agents · CPC title

• G03F7/16

  Coating processes; Apparatus therefor (applying coatings to base materials in general B05; applying photosensitive compositions to base for photographic purposes G03C1/74) · CPC title

• G03F7/20

  Exposure; Apparatus therefor (photographic printing apparatus for making copies G03B27/00) · CPC title