Patent ID: 10312125

Abstract:
A protective tape that improves solder bonding properties and reduces wafer warping. The protective tape includes, in the following order, an adhesive agent layer, a first thermoplastic resin layer, a second thermoplastic resin layer, and a matrix film layer. The protective tape satisfies the conditions expressed by the following formulae (1) to (3): Ga>Gb  (1)Ta<Tb  (2)(Ga*Ta+Gb*Tb)/(Ta+Tb)≤1.4E+06 Pa.  (3) Ga represents a shear storage modulus of the first thermoplastic resin layer at a pasting temperature at which the protective tape is pasted; Gb represents a shear storage modulus of the second thermoplastic resin layer at the pasting temperature at which the protective tape is pasted; Ta represents a thickness of the first thermoplastic resin layer; and Tb represents a thickness of the second thermoplastic resin layer.