Resin composition, and cured product (1) thereof

Abstract

The present invention relates to a resin composition which has a low viscosity (at 25˚C) of not more than 1300mPa·s and a relatively high liquid refractive index of at least 1.50, which is used to seal a surface of an organic electroluminescent (EL) element, and with which a cured product exhibiting excellent visible light transmission, excellent light resistance, a high Tg, and a low water vapour transmission rate can be obtained. The resin composition has a viscosity measured at 25˚C of not more than 1300mPa·s, and includes an aromatic compound (A) and a cyclic compound (B). Aromatic compound (A) has an oxetanyl group or an epoxy group, and has at least one skeleton selected from the group consisting of: a skeleton of biphenyl, bisphenol A, bisphenol F, bisphenol S, or the like represented by formula (A-A) […]; a phenylene skeleton which may be substituted with a C1-4 alkyl group, and which is represented by formula (A-B) […]; an anthracene skeleton; and a phenanthrene skeleton. Cyclic compound (B) has an oxetanyl group or an epoxy group, and satisfies the following conditions (conditions for cyclic compound (B): that the ring in cyclic compound (B) be an aromatic ring, an aliphatic ring, or a heterocycle; in cases when the ring is (a) an aromatic ring, that the cyclic compound have an oxetanyl group or an epoxy group, and an aromatic ring having a structure different to that of the compound used as aromatic compound (A); and, in cases when the ring is (b) an aliphatic ring, that the cyclic compound be either an alicyclic epoxy resin, or, a cyclic compound having an oxetanyl group or an epoxy group, and a cycloalkylene skeleton or an alicyclic hydrocarbon skeleton having a cross-linking structure).

Description

Background technique [0001] Recently, low moisture permeability materials are important materials in various industries. Especially in the electrical, electronic and display peripheral industries, it is an essential material to maintain quality, and a higher-performance low-moisture-permeability material is desired. [0002] In recent years, among displays, a thin display called a flat panel display (FPD), especially a plasma display (PDP) and a liquid crystal display (LCD) have been put into the market and widely used. In addition, an organic electroluminescence (EL) display (OLED) is expected as a next-generation self-luminous thin film display, and has already been put into practical use in some products. An organic EL element of an organic EL display has a structure in which an element part main body including a thin film laminate including a light-emitting layer sandwiched between a cathode and an anode is formed on a substrate such as glass on which a driving circuit su...

AI Technical Summary

Problems solved by technology

However, since the glass sealing cover is produced by drilling a hole for inserting the desiccant into the flat glass substrate, the cost tends to increase.

In addition, when sealing with a sealing cap, since a desiccant is inserted inside the sealing cap, light cannot be extracted from the sealing cap side.

That is, the extraction of light emitted from the light source from the substrate side of the element is limited to bottom emission type elements

In the case of a bottom emission type element, there are problems in that the aperture ratio decreases due to the driver circuit portion formed on the substrate, and the extraction efficiency decreases due to the driver circuit portion blocking part of the light.

It is possible to use a known adhesive as an adhesive for sealing organic EL elements to perform sealing by a solid sealing method, but it is currently difficult to obtain a result that satisfies both reliability and productivity, and it is desired to develop a sealing adhesive suitable for the solid sealing method

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