| 摘要 |
PROBLEM TO BE SOLVED: To provide an adhesive sheet capable of suppressing occurrence of air bubbles between the adhesive sheet and an adherend having a level difference by excellent level difference followability even when used for adhering to the adherend and without affecting appearance by moisture/heat whitening resistance and delay bubble resistance. ! SOLUTION: The adhesive sheet includes an adhesive formed of an adhesive composition containing a (meth)acrylic system copolymer A having a weight average molecular weight of more than 50,000 and 600,000 or less and a (meth)acrylic system copolymer B having a weight average molecular weight of 1,000 or more and 50,000 or less. A dynamic shear loss tangent tanδ of the adhesive calculated on the basis of measured values of a dynamic shear storage elastic modulus G' and a dynamic shear loss elastic modulus G'' satisfies tanδ(20-150°C)≥0.5 and tanδ(1-10-5 Hz)≥0.5. ! COPYRIGHT: (C)2014,JPO&INPIT |
