Cover tape

摘要

Provided is a cover tape that has a small range of stripping strength and generates little static electricity when stripped at a high speed. The cover tape according to the present invention comprises at least a substrate layer, an intermediate layer, a charge transfer layer, and a heat seal layer, characterized in that (A) the charge transfer layer containing an acid-modified polyolefin resin and a conductive agent, and (B) the heat seal layer containing (a) a thermoplastic resin component composed of an acrylic resin, and (b) a styrene-conjugated diene copolymer or a hydrogenated resin thereof, the mass ratio of the two components ((a)/(b)) being 20/80 to 80/20.

主权项

1. A cover tape comprising at least a substrate layer, an intermediate layer, a charge transfer layer and a heat seal layer, wherein (A) the charge transfer layer comprises an acid-modified polyolefin resin and a conductive agent, and
(B) the heat seal layer comprises (a) a thermoplastic resin component consisting of an acrylic resin, and (b) a styrene-conjugated diene copolymer or a hydrogenated resin thereof, the mass ratio of the two components ((a)/(b)) being 20/80 to 80/20, and has a sea-island structure wherein the component (a) forms an island region and the component (b) forms a sea region, wherein the acid value of (a) the thermoplastic resin component in the heat seal layer is 1 to 10 mg KOH/g, and wherein the heat seal layer comprises 1 to 60 parts by mass of a microparticle powder with primary particles having a mass-average particle size of 0.01 to 20 μm, to 100 parts by mass of the thermoplastic resin component.