| 摘要 |
PURPOSE:A composite packaging material having improved heat-selability, capable of being opened readily, obtained by fusing a polyester film deposited with aluminium to a film comprising an ethylenic copolymer, a styrene-butadiene copolymer and styrene resin. CONSTITUTION:A film comprising 2.5-50 wt% of an ethylenic copolymer, 5-70 wt% of a styrene-butadiene copolymer and 10-90 wt% of styrene resin is fused to a polyester film deposited with aluminum with the aluminum deposited surface laid between the films. 25 or less wt% of the ethylenic copolymer makes the range of sealing condition of film small, and no less than 50 wt% of the copolymer increases tack. 5 or less wt% of the styrene-butadiene copolymer makes the strength of film low, and not less than 70 wt% of the copolymer makes film forming difficult. |
