| 摘要 |
<p>The invention is directed to an oriented multi-layer polymer film with a core including a thermoplastic polypropylene matrix material. The core is substantially free of cavitations, voids, and fillers. Oriented multi-layer polymer films of the present invention include at least one opaque thermoplastic polymer layer on at least one side of the core which contains an opacifying pigment and at least one thermoplastic polymer skin layer on an outer most side of one of the opaque layer or the core. The film can be economically made, is from about 0.450 mil. to about 2 mils. thick and allows improved processing characteristics such as heat sealingh, machinability, while also providing high whiteness, strength and stiffness.</p> |
