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 capable of having excellent impact resistance after post-curing, 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 gel fraction of the semi-cured product is X1 and the gel fraction after post-curing of the semi-cured product with active energy rays is X2, the value of (X1/X2)×100 is 71 or more and less than 95.SELECTED DRAWING: None 【課題】後硬化をさせた後において優れた耐衝撃性を有することができる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、前記半硬化物のゲル分率をＸ１、前記半硬化物を活性エネルギー線で後硬化したときのゲル分率をＸ２としたとき、（Ｘ１／Ｘ２）×１００の値が７１以上、９５未満である。【選択図】なし