| 摘要 |
The invention discloses high clarity multilayer films that are easy to tear in the transverse direction, wherein the core layer is made of a blend of from 5 to 50 wt % of crystal polystyrene and from 95 to 50 wt % of transparent styrene-butadiene block copolymer (5-40 wt % 1,3-butadiene, 60-95 wt % styrene) and the outer layers comprise from 85 to 100 wt % of a metallocene catalysed polyethylene (density:0.915-0.960 g/cm^3, MI2:0.2 to 10 g/10min), said polyethylene being produced in the presence of a metallocene catalyst having the general formula: R (THI)2 MQZ-2 wherein THI is a tetrahydrogenated indenyl group, R is a substituted or unsubstituted C1-C4 alkylidene radical, a dialkyl germanium, a dialkyl silicon, a diaryl silicon, a di-alkoxysilane, a diphenoxysilane, or an alkyl phosphine or amine radical bridging two tetrahydrogenated indenyl groups, Q is a hydrocarbyl radical such as aryl, alkyl, alkenyl, alkylaryl, or arylalkyl radical having from 1-20 carbon atoms, hydrocarboxy radical having 1-20 carbon atoms or halogen and can be the same or different from each other, M is a group lVb, Vb or Vlb transition metal, and Z is the valence of the transition metal, and from 0% to 15 % by weight of either low density polyethylene or any other polyethylene catalysed by another metallocene than that of general formula R (THI) 2 MQZ-2. The invention also covers the process for producing such films as well as the use of the films. |
