Patent ID: 6017623
Filing Date: 2000-01-25
Classification: B32B,B65D,C09J,Y10T

Abstract:
A cover tape for packaging electronic components which cover tape is heat sealable to a plastic carrier tape, characterized in that the cover tape is composed of a biaxially oriented film of any one of polyester, polypropylene and nylon; a heat sealant layer consisting of a mixture of 100 parts by weight of thermoplastic resin having a softening temperature of 40.degree. C. to 130.degree. C. and 1 to 60 parts by weight of a filler having a particle size of 0.2 to 20 .mu.m; and an intermediate layer between the biaxially oriented film and the heat sealant layer, and said intermediate layer is composed of a resin composition consisting of 100 parts by weight of a polyethylene having a melt flow rate of 10 to 30 g/10 min, 5 to 100 parts by weight of a polystyrene having a melt flow rate of 10 to 30 g/10 min and 1 to 50 parts by weight of at least one member selected from the group consisting of a hydrogenated styrene-butadiene-styrene block copolymer having a melt flow rate of 30 to 250 g/min and a hydrogenated styrene-isoprene-styrene block copolymer having a melt flow rate of 30 to 250 g/10 min; said biaxially oriented film has a thickness of 5 to 30 .mu.m, the intermediate layer has a thickness of 5 to 50 .mu.m, and the heat sealant layer has a thickness of 0.2 to 3 .mu.m, and wherein said resin of the intermediate layer is so constituted that the peel strength between the cover tape and the carrier tape becomes 10 to 120 g/mm of seal width.