HEAT RESISTANT ADHESIVE SHEET

摘要

Provided is a heat resistant adhesive sheet for suppressing fluctuation of dimensional stability of a flexible printed board, especially a double layer flexible printed board, demand of which is further increasing recently and in which higher heat resistance and reliability are required. The heat resistant adhesive sheet having a heat resistant adhesive layer including a thermoplastic polyimide at least on one surface of an insulating layer including a non-thermoplastic polyimide is characterized in that a deviation from a flat state is 10mm or less.