Polyolefin film containing cyclic olefin polymer, preparation method and use thereof

摘要

Polyolefin foil consists of a layer contg. at least 50 wt.% polyolefin and less than 50 wt.% cyclo-olefin polymer (COP). The novelty is that the COP is amorphous and has an ave. mol. wt. (Mw) of 200-100000. This Mw of the COP is not more than 50% of the Mw of the polyolefin. The cyclo-olefin polymer ia a homo- or co-polymer with not more than 20 wt.% comonomer. Also claimed are prodn. of the foil and a packaging made of the foil. Pref. the COP-contg. layer contains 60-99 wt.% polyolefin, pref. propylene polymers, and 1-40 wt.% cycloolefin polymer. The polyolefin, pref. propylene, has a Mw of 150000-400000. The polyolefin has a mol. wt. distribution (Mw/Mn) of 2-15, pref. 2-6. The Mw of the cycloolefin polymer is 200-20000 and not more than 50% of the Mw of the polyolefin. The cycloolefin polymer has a mol. wt. distribution of 1-5.