Resin composition, resin cured product, and liquid discharge head

Abstract

An epoxy resin composition, including: an epoxy resin (A) represented by Formula (1); an epoxy resin (B) having an epoxy equivalent of 220 or less and having twice or more epoxy groups in a molecule than epoxy groups of the epoxy resin (A); and a photocationic polymerization initiator (C), in which: the epoxy resins (A) and (B) constitute main components; and a weight of the epoxy resin (A) is 40% or more and a weight of the epoxy resin (B) is 30% or more with respect to a total weight of the epoxy resins (A) and (B):

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a stereoscopic perspective view of a cured product of an epoxy resin composition of each of Examples of the present invention used for Evaluation 1.

FIG. 2 is a schematic sectional view of a cured product of an epoxy resin composition of each of Comparative Examples of the present invention used for Evaluation 1.

FIG. 3 is a perspective view of a cured product of the epoxy resin composition of each of Comparative Examples of the present invention used for Evaluation 1.

FIG. 4 is a perspective view of a cured product of an epoxy resin composition of each of Examples of the present invention used for Evaluation 2.

FIG. 5 is a schematic diagram of an ink jet recording head according to an embodiment of the present invention.

FIG. 6 is a schematic sectional diagram showing an example of a method of producing an ink jet recording head of each of Examples of the present invention.

FIG. 7 is a schematic sectional diagram showing an example of the method of producing an ink jet recording head of each of Examples of the present invention.

FIG. 8 is a schematic sectional diagram showing an example of the method of producing an ink jet recording head of each of Examples of the present invention.

FIG. 9 is a schematic sectional diagram showing an example of the method of producing an ink jet recording head of each of Examples of the present invention.

FIG. 10 is a schematic sectional diagram showing an example of the method of producing an ink jet recording head of each of Examples of the present invention.

FIG. 11 is a schematic sectional diagram showing an example of the method of producing an ink jet recording head of each of Examples of the present invention.

Claims

1. An epoxy resin composition, comprising: an epoxy resin (A) represented by Formula (1);an epoxy resin (B) having an epoxy equivalent of 220 or less and having twice or more epoxy groups in a molecule than epoxy groups of the epoxy resin (A); anda photocationic polymerization initiator (C), wherein:the epoxy resins (A) and (B) constitute main components; anda weight of the epoxy resin (A) is 40% or more and a weight of the epoxy resin (B) is 30% or more with respect to a total weight of the epoxy resins (A) and (B):

2. An epoxy resin composition according to claim 1, wherein the epoxy resin (B) comprises an epoxy resin represented by Formula (2) described below:

3. An epoxy resin composition according to claim 1, wherein the epoxy resin (B) comprises an epoxy resin represented by Formula (5) described below:

4. A resin cured product, which is obtained by curing the epoxy resin composition according to claim 1 through photocationic polymerization.

5. An epoxy resin composition according to claim 1, wherein the cationic polymerization initiator is an aromatic sulfonium salt or an aromatic iodonium salt.

6. An epoxy resin composition according to claim 5, wherein the aromatic sulfonium salt is a compound represented by Formula (6) described below.

7. A liquid discharge head, comprising: an energy generating element for generating energy to be used for discharge of a liquid;a discharge port for discharging the liquid; anda passage for supplying the liquid to the discharge port, wherein:the discharge port and the passage are each formed of a photosensitive resin; andthe photosensitive resin comprises:an epoxy resin (A) represented by Formula (1);an epoxy resin (B) having an epoxy equivalent of 220 or less and having twice or more epoxy groups in a molecule than epoxy groups of the epoxy resin (A); anda photocationic polymerization initiator (C), wherein:the epoxy resins (A) and (B) constitute main components of the photosensitive resin; anda weight of the epoxy resin (A) is 40% or more and a weight of the epoxy resin (B) is 30% or more with respect to a total weight of the epoxy resins (A) and (B).