A pellicle is proposed in which an adhesive layer is formed of an adhesive which undergoes a hardness change at a rate from −50% through +50% of its initial hardness, measured after curing, when it is let to sit in atmosphere of a temperature of 300 degrees C. for 7 days on end; the rate of hardness change being defined by a following equation:Rate of hardness change (%)={(hardness after the sitting)−(initial hardness before the sitting)}÷initial hardness before the sitting)×100.
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机译：提出了这样一种防护膜，其中，当将其放置在一定温度的环境中时，固化后测得的粘合层是由粘合剂形成的，该粘合剂层的硬度以其初始硬度的-50％至+ 50％的速率发生变化。在300℃下连续7天;硬度变化率由以下公式定义：<？in-line-formulae description =“在线表达式” end =“ lead”？>硬度变化率（％）= {（坐姿后的硬度）-（坐姿前的初始硬度）}÷坐位前的初始硬度坐姿）×100。<？in-line-formulae description =“ In-line Formulae” end =“ tail”？>
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