Adhesive sheet

Abstract

This invention provides an adhesive sheet that exhibits excellent reliability under high temperature and high humidity conditions and is less prone to polyolefin formation in polarizing films. The adhesive sheet 1 of this invention is an optical adhesive sheet. The adhesive sheet 1 has a thickness of 150 μm or more, a saturated moisture content X1 of 2.0% by mass at 23°C and 50% relative humidity, and a water permeability Y1 (converted from 50 μm) of 200 g / m²·24 h or more at 40°C and 92% relative humidity. Preferably, the relationship between the saturated moisture content X2 of the adhesive sheet 1 at 85°C and 85% relative humidity and the aforementioned saturated moisture content X1 is 0.5 ≤ X2 - X1 ≤ 2.

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