| abstract |
Under the conditions of a temperature of 90° C. and a frequency of 1 Hz, strain is generated in a test piece of a resin film having a diameter of 25 mm and a thickness of 1 mm, the storage elastic modulus of the test piece is measured, and the test piece when the strain of the test piece is 1%. When the storage elastic modulus of the test piece is Gc1, the storage elastic modulus of the test piece is Gc300 when the strain of the test piece is 300%, the X value calculated by the formula: X=Gc1/Gc300 . A composite sheet comprising a substrate, a buffer layer formed on the substrate, and the resin film formed on the buffer layer. |