ENCAPSULANT FOR ORGANIC ELECTROLUMINESCENCE DISPLAY ELEMENT

• Main Authors: SASAKI MAKIKO, KURIMURA HIROYUKI, NAKADA HITOSHI, KAWAMURA NORIFUMI, NAKAJIMA GOSUKE, YUKI TOSHIHISA
• Format: Patent
• Language: English; Japanese
• Published: 30.09.2021
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; SEMICONDUCTOR DEVICES; THEIR PREPARATION OR CHEMICAL WORKING-UP

To enable achievement of both ejection performance when using an inkjet and reliability of an organic EL element.SOLUTION: An encapsulant for an organic electroluminescence display element contains (A) an acyclic alkanediol di(meth)acrylate having 6 or more carbon atoms, (B) a cyclic monomer, and (C) a photopolymerization initiator. (B) the cyclic monomer contains a cyclic monofunctional (meth) acrylate and a cyclic bifunctional (meth)acrylate, and the following formulas (I) and (III) are satisfied: 8 mPa s≤η≤50 mPa s ...(I), and γ/2η<0.9 m/s ...(III) (In the formulas, η represents the viscosity measured by an E-type viscometer at 25°C, and γ represents a static surface tension measured by a pendant drop method).SELECTED DRAWING: None 【課題】インクジェットを用いる際の吐出性と、有機ＥＬ素子の信頼性との両立。【解決手段】（Ａ）非環式の炭素数６以上のアルカンジオールジ（メタ）アクリレートと、（Ｂ）環状モノマーと、（Ｃ）光重合開始剤を含有し、（Ｂ）環状モノマーは、環状単官能（メタ）アクリレートと環状２官能（メタ）アクリレートとを含有し、下記の数式（Ｉ）及び（ＩＩＩ）を共に満たす有機エレクトロルミネッセンス表示素子用封止剤。８ｍＰａ・ｓ≦η≦５０ｍＰａ・ｓ ・・・（Ｉ）γ／２η＜０．９ｍ／ｓ ・・・（ＩＩＩ）（式中、ηは２５℃においてＥ型粘度計により測定される粘度を表し、γはペンダントドロップ法により測定された静的表面張力を表す。）【選択図】なし