ADHESIVE SHEET, LAMINATE, AND DEVICE FOR TRANSMITTING OR RECEIVING ELECTROMAGNETIC WAVE

• Main Authors: UCHIDA NORIYUKI, NODA MARIKO, KAWAHARA RYOSUKE, ISHIDO YASUSHI
• Format: Patent
• Language: English; Japanese
• Published: 03.04.2023
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; DYES; 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-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; PERFORMING OPERATIONS; POLISHES; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

To provide an adhesive sheet which is suitably usable even when a frequency of a transmission signal is increased, prevents foaming on an interface between an adherend and the adhesive sheet even under high temperature environment, and prevents change in optical characteristics, a laminate using the adhesive sheet, and a device for transmitting or receiving electromagnetic waves.SOLUTION: An adhesive sheet has an adhesive layer, wherein the adhesive layer contains a hydrogenated styrenic elastomer and has a gel fraction of 30 wt.% or more, and the adhesive sheet has a dielectric loss tangent at a frequency of 10 GHz of 0.005 or less and 90° adhesive force to glass of 5 N/25 mm or more.SELECTED DRAWING: None 【課題】伝送信号が高周波数化した場合にも好適に使用することができ、高温環境下でも被着体との界面に発泡が生じにくく、光学特性の変化も生じにくい粘着シート、並びに、該粘着シートが用いられた積層体、及び、電磁波を発信又は受信する装置を提供する。【解決手段】粘着剤層を有する粘着シートであって、前記粘着剤層は、水添スチレン系エラストマーを含有し、ゲル分率が３０重量％以上であり、前記粘着シートは、周波数１０ＧＨｚでの誘電正接が０．００５以下、ガラスに対する９０°剥離力が５Ｎ／２５ｍｍ以上である粘着シート。【選択図】なし