Patent ID: 9338906
Filing Date: 2016-05-10
CPC Classification: B32B,B65D,C08K,C09J,H05K,Y10T

Claim Text:
1. A cover film comprising at least a substrate layer, an intermediate layer, a peel layer and a heat seal layer capable of being heat-sealed to a carrier tape; wherein the peel layer comprises, as a main component, a hydrogenated aromatic vinyl-conjugated diene copolymer having an aromatic vinyl content of 15 to 35 mass %, the thickness of the substrate layer is 12 to 25 μm, the thickness of the intermediate layer is 5 to 50 μm, the thickness of the peel layer is 0.1 to 3 μm and the thickness of the heat seal layer is 0.1 to 5 μm, and the heat seal layer comprises, as a main component, a styrenic-acrylic copolymer having a mass-average molecular weight of 5000 to 20000.