PRESSURE SENSITIVE ADHESIVE SHEET

• Main Authors: MINOURA KAZUKI, NISHIWAKI MASATAKA, MUSASHIJIMA YASUSHI
• Format: Patent
• Language: English; Japanese
• Published: 30.08.2021
• 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 a novel pressure sensitive adhesive sheet with limited light permeability and an improved refractive index.SOLUTION: A pressure sensitive adhesive sheet 1 includes an adhesive layer 21, and has whole light transmittance of 80% or less and a refractive index of 1.50 or higher. In the pressure sensitive adhesive sheet 1, the adhesive layer 21 contains at least one kind of particle PHRI, selected from a metal particle, a metal compound particle, an organic particle and an organic-inorganic composite particle, whose average grain size is 1-100 nm and which is contained at proportion of 25 wt.% or more in the adhesive layer 21. In the pressure sensitive adhesive sheet 1, the adhesive layer 21 is an acrylic adhesive layer containing an acrylic polymer as a base polymer.SELECTED DRAWING: Figure 1 【課題】光透過性が制限されており、かつ屈折率が向上した新規な粘着シートを提供する。【解決手段】粘着剤層２１を備え、全光線透過率が８０％以下であり、かつ屈折率が１．５０以上である、粘着シート１。前記粘着剤層２１は、金属粒子、金属化合物粒子、有機粒子および有機−無機複合体粒子から選択される少なくとも１種の、平均粒径１〜１００ｎｍの粒子ＰＨＲＩを含み、前記粘着剤層２１中に２５重量％以上の割合で含まれる、前記粘着シート１。前記粘着剤層２１は、ベースポリマーとしてアクリル系ポリマーを含むアクリル系粘着剤層である、粘着シート１。【選択図】図１