OPTICAL ADHESIVE LAYER, METHOD FOR MANUFACTURING OPTICAL ADHESIVE LAYER, OPTICAL FILM WITH ADHESIVE LAYER, AND IMAGE DISPLAY DEVICE

• Main Authors: SUGINO SHOKO, ONO KANTA, TOYAMA YUSUKE, KIMURA TOMOYUKI
• Format: Patent
• Language: English; Japanese
• Published: 25.11.2021
• 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; 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 ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; USE OF MATERIALS AS ADHESIVES

To provide an optical adhesive layer which is excellent in such durability as to prevent foaming and peeling in an adherend under heating and humidification condition, and prevents light leakage even in a narrow frame panel, an optical film with an adhesive layer having the optical adhesive layer on at least one surface of the optical film, and a liquid crystal display device using the optical film with the adhesive layer.SOLUTION: An optical adhesive layer is formed of an adhesive composition containing a (meth) acrylic polymer, and has a gel fraction of more than 90% and a weight average molecular weight (Mw) of sol fraction being 350,000 or more.SELECTED DRAWING: Figure 1 【課題】本発明は、被着体に対して、加熱・加湿条件下において、発泡や剥がれなどが生じない耐久性に優れ、狭額縁パネルでも光漏れを生じない光学用粘着剤層、及び、前記光学用粘着剤層を光学フィルムの少なくとも片面に有する粘着剤層付光学フィルム、さらには、前記粘着剤層付光学フィルムを用いた液晶表示装置を提供することを目的とする。【解決手段】（メタ）アクリル系ポリマーを含有する粘着剤組成物により形成された光学用粘着剤層であって、ゲル分率が９０％を超え、ゾル分の重量平均分子量（Ｍｗ）が３５万以上であることを特徴とする光学用粘着剤層。【選択図】図１