Patent attributes
The present invention provides: a multilayer film for top-seal to be used for a tray having a surface layer containing a polystyrene-based resin, the multilayer film at least having a first layer and a second layer, the first layer containing 50% by weight or more of at least one selected from the group consisting of (a) a copolymer including a conjugated diene and a vinyl aromatic compound; (b) a copolymer resulting from hydrogenation of a copolymer including a conjugated diene and a vinyl aromatic compound; (c) a combined resin of: a hydrogenated product of a copolymer including a conjugated diene and a vinyl aromatic compound; and an α-olefin copolymer; (d) a mixture of: a combined resin of: a hydrogenated product of a copolymer including a conjugated diene and a vinyl aromatic compound; and an α-olefin copolymer, and an ethylene-α-olefin copolymer, and (e) a mixture of: a combined resin of: a hydrogenated product of a copolymer including a conjugated diene and a vinyl aromatic compound; and an α-olefin copolymer, and a branched low-density polyethylene, the multilayer film having: a gel fraction of from 0.5 to 50% by weight; a thickness of 70 μM or less; a tensile modulus of from 40 to 300 MPa in any direction; and a thermal shrinkage ratio at 200° F. of from 15 to 75% in any direction; a packaged body using the multilayer film; and a process for producing the multilayer film.
