PRESSURE-SENSITIVE ADHESIVE COMPOSITION, PRESSURE-SENSITIVE ADHESIVE SHEET, LAMINATE FOR TOUCH PANEL AND ELECTROSTATIC CAPACITANCE TYPE TOUCH PANEL

摘要

PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive composition which is excellent in adhesion when formed into a pressure-sensitive adhesive sheet and can be prevented from malfunctioning under wide range of temperature environment from low temperature to high temperature when used for an electrostatic capacitance type touch panel as the pressure-sensitive adhesive sheet, and to provide a pressure-sensitive adhesive sheet obtained from the composition, a laminate for a touch panel with the pressure-sensitive adhesive sheet and to provide an electrostatic capacitance type touch panel sensor.SOLUTION: There is provided the pressure-sensitive adhesive composition containing monoacylphosphine oxide A1, bisacylphosphine oxide A2 and a radical polymerizable monomer B having a special group and a prescribed solubility parameter where the content of the A1 is 1.5 mass% or more based on the total amount of the composition, a mass ratio b/a between the content b of B and the total content a of A1 and A2, is 3.0 to 30.0, a ratio of molar number of an oxygen atom and molar number of a carbon atom contained in the composition of 0.1 or less.