Use of nucleated propylene butene random copolymers or terpolymers for the production of sterilizable blown films

摘要

Use of a polymer composition comprised of (i) a propylene/butene random copolymer or terpolymer which is comprised of
86.0 - 98.0 wt% of propylene
2.0 - 12.0 wt% of butene and
0.0 - 2.0 wt% of ethylene and
(ii) 0.001 - 1.0 wt% of one or more ±-nucleating agents
for the production of sterilizable water or air quenched blown films which have the following properties:
a) a haze according to ASTM D 1003-92 for a 50 µm film of less than 8% before and after steam sterilization at 121°C for 30 minutes and
b) 20° Gloss according to DIN 67 530 for a 50 µm film of at least 55% before steam sterilization at 121°C for 30 minutes and of at least 60% after steam sterilization at 121 °C for 30 minutes.