PHOTOCURABLE ADHESIVE SHEET, ADHESIVE SHEET AND IMAGE DISPLAY DEVICE

• Main Authors: NIIMI KAHORU, UCHIDA TAKAHISA, YAMAMOTO RYOTA, INANAGA MAKOTO
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2018
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; ADVERTISING; CHEMISTRY; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; DISPLAYING; DYES; EDUCATION; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PERFORMING OPERATIONS; PHYSICS; POLISHES; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

PROBLEM TO BE SOLVED: To provide a photocurable adhesive sheet which can fill every corner by following step portions of a stuck surface, does not lower adhesive reliability even when irradiated with light for a long period of time, and can easily perform a sticking operation.SOLUTION: A photocurable adhesive sheet is an adhesive sheet before photocuring which is formed of a resin composition containing a (meth)acrylic copolymer (A), a crosslinking agent (B) and a photopolymerization initiator (C), has photocurability, has the following (1) and (2) characteristics and has the following (3) characteristics after photocuring. (1) The adhesive sheet can keep the shape at 0-40°C and exhibits self-adhesiveness; (2) the adhesive sheet exhibits viscosity at 70-100°C of 100-3,000 Pa s; and (3) the adhesive sheet has viscosity at 70-100°C of 3,000-50,000 Pa s.SELECTED DRAWING: None 【課題】貼合面の段差部に追従して隅々まで充填することができ、長時間光照射されても接着信頼性が低下せず、貼り合せ作業を容易に行うことができる光硬化型粘着シートを提供せんとする。【解決手段】（メタ）アクリル系共重合体（Ａ）、架橋剤（Ｂ）及び、光重合開始剤（Ｃ）を含有する樹脂組成物から形成された光硬化前の粘着シートであって、光硬化性を有し、且つ、次の（１）及び（２）の特性を備え、且つ、光硬化後に下記（３）の特性を有することを特徴とする光硬化型粘着シートを提案する。（１）０〜４０℃において、形状保持することができ、且つ自己粘着性を示す。（２）７０〜１００℃において、粘度が１００〜３０００Ｐａ・ｓを示す。（３）７０〜１００℃における粘度が３０００〜５００００Ｐａ・ｓである。【選択図】なし