ACTIVE ENERGY RAY-CURABLE ADHESIVE SHEET AND DISPLAY DEVICE

• Main Authors: MUTO KUNIAKI, KURODA DAISUKE, ASAO MACHI, SEGUCHI SEIJI, IWASAKI NOBUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 10.11.2022
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; DYES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; POLISHES; USE OF MATERIALS AS ADHESIVES

To provide an active energy ray-curable adhesive sheet having low water vapor permeability, and a display device using the adhesive sheet.SOLUTION: The active energy ray-curable adhesive sheet of the present invention comprises a semi-cured product of an adhesive composition which contains at least a (meth)acrylic polymer, a photopolymerization initiator, and a diene copolymer having (meth)acrylate moieties at both terminals. When the water vapor permeability before curing with active energy rays is X1 and the water vapor permeability after curing with active energy rays is X2, X1 is 200 g/(m2 24 hr) or less and the value of X1/X2 is less than 1.5.SELECTED DRAWING: None 【課題】水蒸気透過率が低い活性エネルギー線硬化型粘着シート及び当該粘着シートを用いた表示装置を提供する。【解決手段】本発明の活性エネルギー線硬化型粘着シートは、（メタ）アクリル系ポリマーと、光重合開始剤と、両末端に（メタ）アクリレート部位を有するジエン系共重合体とを少なくとも含む粘着剤組成物の半硬化物を備え、活性エネルギー線による硬化前の水蒸気透過率をＸ１、活性エネルギー線による硬化後の水蒸気透過率をＸ２としたとき、Ｘ１が２００ｇ／（ｍ２・２４ｈｒ）以下であり、Ｘ１／Ｘ２の値が１．５未満である。【選択図】なし