| 摘要 |
Peelable, oriented, opaque, multilayer polyolefin film has at least one opaque layer (a) contg. pigments with a particle dia. of 0.01-1 mu and a peelable outer layer (b), all layers being essentially free from vacuoles. Pref. layer(s) (a) contain ≥ 50 (pref. 75-100) wt.% polyolefin, pref. PP, and NOTGREATER 40 (pref. 1-30) wt.% opacifying pigments with a mean particle dia. of pref. 0.01-0.7 (esp. pref. 0.01-0.4) mu , pref. TiO2 and/or CaCO3 and/or BaSO4 and/or SiO2. Layer (b) contains a mixt. of two incompatible polymers I and II. Component I is PP homopolymer, a copolymer of ethylene (E) with propylene (P) or butylene (B) or another 5-10C alpha -olefin (AO), a copolymer of P with B or E or AO, a terpolymer of E, P and B or E, P and AO, or a mixt. of two or more of these, or a blend thereof, opt. mixed with one or more of these polymers. |
