HIGHLY FILLED POLYPROPYLENE FILMS HAVING VOIDS

摘要

Polypropylene films and methods for making the films having white opaque characteristics are disclosed. The films typically incorporate polymer blending to improve microcavitation, increased opacity, increased optical density and lower light transmission for a white opaque film with CaCO3 loading at and above 40% by weight. A combination of polypropylene resins of specified density, crystallinity and ratio relationships have been identified with TiO2.