Moulding compsn. based on amorphous and crystalline polypropylene - contains satd. hydrocarbon resin, giving glossy films and mouldings

摘要

Polypropylene moulding compsn. is based on a mixt. of 70-88 (wt.)% polypropylene (I) which is 1% soluble on boiling in xylene at a (I)/xylene ratio of 5:95 and cooling to room temp., and 12-30% polypropylene (II), which is >99% soluble under these conditions, (I) and (II) having (approx.) the same intrinsic viscosity and mol. wt. distribution (GPC method) and absolute intrinsic viscosity value in the 1-10 range (in decalin at 130 degrees C). The novelty is that the compsn. also contains 3-30% hydrocarbon resin (III) with a softening point of 90-140 degrees C (ASTM E28/58T) and a bromine number of 5 g. Br/100 g. (ASTM D1159), homogeneously blended with (I) and (II). The compsn. is useful for making undrawn, uni- or biaxially oriented and laminated films and other articles, e.g. packaging tapes and injection mouldings. (III) improves the surface gloss.