Patent ID: 8722185
Filing Date: 2014-05-13
Classification: C09J,Y10T

Abstract:
1. A pressure-sensitive adhesive sheet for glass plates comprising a pressure-sensitive adhesive layer including an acrylic polymer, wherein the content of the acrylic polymer in the pressure-sensitive adhesive layer is 30% by weight or more in relation to the total amount (100% by weight) of the pressure-sensitive adhesive layer; the acrylic polymer substantially comprises no acidic functional group; the solvent-insoluble fraction of the pressure-sensitive adhesive layer is 50% or more; and the adhesive force to glass as determined by the following method is 12.0 N or less; by using a pressure-sensitive adhesive sheet (width: 26 mm, length: 40 mm), a glass plate A (width: 50 mm, length: 100 mm, thickness: 0.7 mm) and a glass plate B (width: 26 mm, length: 760 mm, thickness: 1.0 mm) are laminated on each other to yield a laminate in such a way that: the size of the adhesion portion is 26 mm in width and 40 mm in length; the lengthwise direction of the pressure-sensitive adhesive sheet, the lengthwise direction of the glass plate A and the lengthwise direction of the glass plate B are the same each other; and one lengthwise end A (adhesion end A) and one lengthwise end of the glass plate B are superposed to each other; the resulting laminate is allowed to stand in an atmosphere of 23° C. for 30 minutes, and then autoclave treated under the conditions of a pressure of 5 atm, a temperature of 50° C. and a period of time of 15 minutes; then, the laminate after the autoclave treatment is heat treated under the conditions of a temperature of 145° C. and a period of time of 4 minutes; then, the laminate after the heat treatment is allowed to stand in an atmosphere of 23° C. for 30 minutes, successively the portion of the glass plate B located at a distance displaced by 20 mm in the lengthwise direction from the end B (the adhesion end B) opposite to the end A in the pressure-sensitive adhesive sheet and not brought into contact with the pressure-sensitive adhesive sheet is pulled at a tensile rate of 300 mm/min in the thickness direction of the laminate toward the side of the glass plate B, and the force (N) required to peel the glass plate B is determined; the force required for the peeling is defined as the adhesive force to glass.