Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene-butadiene-styrene copolymer and a sequenced styrene-butadiene copolymer

摘要

Stretch cling film with good optical and mechanical properties is made by blown extrusion through an annular die or flat extrusion through a slit die of a mixt. of (a) 5-50 wt. % of a styrene-butadiene-styrene copolymer and (b) 50-95 wt. % of a sequenced styrene-butadiene copolymer, the copolymer(s) (a) and (b) having a density of 0.950-1.01 g/cm3. Pref. the copolymer mixt. contains 8-15 (esp. 25-40) wt. % of component (a). The film is pref. 10-40 micrometres thick. USE/ADVANTAGE - The films have good optical and mechanical properties, good stretch characteristics, good autoadhesive properties by way of the rubber effect, good permeability and freedom from residual deformation. The prods. have good machine application characteristics and are esp. useful for packaging food prods. currently packaged in PVC film.