PRESSURE-SENSITIVE ADHESIVE SHEET AND PRODUCTION METHOD OF THE SAME, AND PRODUCTION METHOD OF IMAGE DISPLAY DEVICE

• Main Authors: TAKARADA SHO, SHIMOKURI DAIKI, NIWA MICHIHITO, NONAKA TAKAHIRO, HATANAKA TOSHIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2020
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; 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; DYES; FREQUENCY-CHANGING; 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; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

To provide a pressure-sensitive adhesive sheet which has level difference absorbing property and excellent adhesion durability corresponding to impact resistance and strain stress in a wide temperature range.SOLUTION: A pressure-sensitive adhesive sheet (5) is a photocurable pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive composition containing an acrylic base polymer having a crosslinked structure, a photopolymerizable multifunctional compound having two or more photopolymerizable functional groups in a molecule and a photopolymerization initiator, formed in layers. The pressure-sensitive adhesive sheet has a storage elastic modulus of 100-250 kPa at 25°C and 1 Hz, and preferably a gel fraction of 25-70%. The storage elastic modulus of the pressure-sensitive adhesive sheet at 25°C and 1 Hz after photocuring of the pressure-sensitive adhesive composition is preferably 180-400 kPa.SELECTED DRAWING: Figure 1 【課題】段差吸収性を有し、かつ広い温度範囲での耐衝撃性および歪応力に対する接着耐久性に優れる粘着シートを提供する。【解決手段】粘着シート（５）は、架橋構造を有するアクリル系ベースポリマー、１分子中に２個以上の光重合性官能基を有する光重合性多官能化合物、および光重合開始剤を含有する粘着剤組成物が層状に形成された光硬化性の粘着シートである。粘着シートは、２５℃、１Ｈｚでの貯蔵弾性率が１００〜２５０ｋＰａであり、ゲル分率が２５〜７０％であることが好ましい。粘着剤組成物を光硬化後の２５℃、１Ｈｚでの粘着シートの貯蔵弾性率は、１８０〜４００ｋＰａが好ましい。【選択図】図１