KR-102963740-B1 - A display device comprising a black photosensitive resin composition, a cured product thereof, and a concealing layer including the cured product

Abstract

[Problem] To provide a black photosensitive resin composition that maintains opacity and insulation while also having excellent hardness and adhesion of the cured product. [Solution] A black photosensitive resin composition comprising at least (A) a photosensitive resin, (B) a photopolymerization initiator, (C) a black pigment, and (D) a filler, wherein the (A) photosensitive resin comprises an acrylate compound having a bonding portion and at least two (meth)acryloyl groups bonded to the bonding portion through a connecting portion, wherein the connecting portion is at least one selected from the group consisting of a caprolactone group, an ethylene oxide group, and a propylene oxide group, and the total number of carbon atoms and oxygen atoms in one connecting portion is 3 to 15, and the (D) filler comprises calcium carbonate.

Inventors

• 오노다, 하루카
• 요시다, 마사토

Assignees

• 다이요 홀딩스 가부시키가이샤

Dates

Publication Date

20260513

Application Date

20200327

Priority Date

20190329

Claims (8)

1. A black photosensitive resin composition comprising at least (A) a photosensitive resin, (B) a photopolymerization initiator, (C) a black pigment, and (D) a filler, The above (A) photosensitive resin comprises an acrylate compound having a bonding portion and at least two (meth)acryloyl groups bonded to the bonding portion through a connecting portion, wherein the connecting portion is at least one selected from the group consisting of a caprolactone group, an ethylene oxide group, and a propylene oxide group, and the total number of carbon atoms and oxygen atoms in one connecting portion is 3 to 15. The above (D) filler comprises calcium carbonate and talc. A black photosensitive resin composition characterized by
2. In claim 1, the acrylate compound is a black photosensitive resin composition having a total number of carbon atoms and oxygen atoms in all connecting parts of 6 to 165.
3. delete
4. A black photosensitive resin composition according to claim 1 or 2, wherein the (D) filler is included in an amount of 30 to 60 parts by mass per 100 parts by mass of the (A) photosensitive resin component in terms of solid content.
5. A black photosensitive resin composition according to claim 1 or 2, wherein the (B) photopolymerization initiator is included in a ratio of 5 to 20 parts by mass in terms of solid content with respect to 100 parts by mass of the (A) photosensitive resin component.
6. A black photosensitive resin composition according to claim 1 or 2, wherein the (C) black pigment is carbon black.
7. A cured product characterized by being obtained by curing a black photosensitive resin composition described in claim 1 or 2.
8. glass substrate and, A concealing layer comprising the cured material described in claim 7, provided on at least a portion of one side of the glass substrate. A display device characterized by having at least [ ].

Description

A display device comprising a black photosensitive resin composition, a cured product thereof, and a concealing layer including the cured product The present invention relates to a black photosensitive resin composition, and more specifically, to a black photosensitive resin composition suitable for use in concealing a glass substrate of a display device, a cured product thereof, and a display device having a concealing layer comprising the cured product. In recent years, display devices equipped with liquid crystal elements, light-emitting diode elements, organic electroluminescence elements, etc., have adopted displays with touch panel functions. In such display devices, an ITO wiring pattern is formed in the image display area, and a metal wiring pattern is formed around it. For example, in the type where the touch panel layer is formed directly on the cover glass (OGS type), the ITO or metal wiring pattern is formed after a concealing layer is formed around the cover glass so that the metal wiring pattern is not visible. Therefore, the light-shielding layer requires high light-shielding properties to conceal the wiring and high insulation properties to prevent panel malfunction caused by current flow between the wirings. Furthermore, in recent years, a higher optical density (OD) has been required for the concealing layer. The aforementioned opacity layer was conventionally formed by attaching a black film to a desired location on the surface of a cover glass or by repeatedly applying black ink until opacity was obtained, and the opacity layer was formed using a black photosensitive resin (e.g., Patent Document 1). In addition, carbon black and the like have been used as opaque materials for black ink, but since carbon black is a conductive material, it has been proposed to use inorganic fillers such as talc or illite in addition to carbon black to satisfy opaqueness and insulation properties (Patent Document 2). [Black photosensitive resin composition] The black photosensitive resin composition of the present invention comprises (A) a photosensitive resin, (B) a photopolymerization initiator, (C) a black pigment, and (D) a filler as essential components. (A) the photosensitive resin comprises an acrylate compound having a bonding portion and at least two (meth)acryloyl groups bonded to the bonding portion through a connecting portion, wherein the connecting portion is at least one selected from the group consisting of a caprolactone group, an ethylene oxide group, and a propylene oxide group, and the total number of carbon atoms and oxygen atoms in one connecting portion is 3 to 15. (D) the filler comprises calcium carbonate. Hereinafter, each component constituting the black photosensitive resin composition of the present invention will be described in detail. <(A) Photosensitive resin> (A) The photosensitive resin included in the black photosensitive resin composition of the present invention comprises an acrylate compound having a bonding portion and at least two (meth)acryloyl groups bonded to the bonding portion through a connecting portion, wherein the connecting portion is at least one selected from the group consisting of a caprolactone group, an ethylene oxide group, and a propylene oxide group, and the total number of carbon atoms and oxygen atoms in one connecting portion is 3 to 15. By using such a specific acrylate compound as a photosensitive resin and combining it with calcium carbonate described later as a filler, even a black photosensitive resin composition containing carbon black can improve insulation and adhesion to glass while maintaining opacity. Although the reason for this is not clear, black photosensitive resin compositions tend to have insufficient adhesion to glass substrates because light does not reach deep during exposure, but it is believed that adhesion to glass can be improved by using such a specific acrylate compound as a photosensitive resin. As the specific acrylate compound mentioned above, an acrylate compound (i.e., a modified polyfunctional (meth)acrylate) in which at least two (meth)acryloyl groups are bonded to a bonding portion through one or more of a caprolactone group, an ethylene oxide group, and a propylene oxide group may be suitably used, provided that the total number of carbon atoms and oxygen atoms in one bonding portion is 3 to 15. In a modified polyfunctional acrylate in which the total number of carbon atoms and oxygen atoms in one bonding portion is less than 3, the adhesion to the glass substrate becomes insufficient, while if it exceeds 15, the hardness of the cured film becomes insufficient. The preferred range is 3 to 10. Furthermore, in this specification, the term (meth)acryloyl group is a collective term for acryloyl groups and methacryloyl groups, and the term (meth)acrylate is a collective term for acrylates, methacrylates, and mixtures thereof, and the same applies to other similar expressions. Caprolactone-modified (meth)acrylates c