Mehrschichtige, rollneigungsarme, mattierte Polyolefinfolie zur Verwendung als Trägerfilm für Wundpflaster

摘要

A film having at least three layers, matt on both sides and with a low tendency to rolling up, is made by coextrusion, with the outer layers formed from a mixt. of at least two different polymers and comprising (i) 60-85 wt.% a polyethylene or ethylene copolymer with a low degree of crystallinity and a melt flow index of 1-6 g/10 min. (DIN 53 735, 190 degrees C, load 2.16 kg), esp. an ethylene copolymer contg. O atoms, and (ii) 15-40 wt.% of a propylene polymer with a melt flow index of 1-6 g/10 mins. (DIN 53 753, 230 degrees C, load 2.16 kg), and the core layer formed from a polyethylene or ethylene copolymer with a low degree of crystallinity and a melt flow index of 1-6 g/10 min. (DIN 53 735, 190 degrees C, load 2.16 kg), esp. an ethylene copolymer contg. O atoms with a content of 2-10 wt.% comonomer residues, to give a film with a glass value of at most 5 (DIN 67 530, angle 20 degrees ).