Polyolefin film for stretch packaging

摘要

The present invention relates to a polyolefin stretch packaging film, comprising at least one layer containing a component (A), and which has a storage modulus (E') of from 5.0x108 dyn/cm2 to 5.0x109 dyn/cm2 and a loss tangent (tandelta) of from 0.2 to 0.8, as measured by dynamic viscoelasticity measurement at a frequency of 10 Hz and at a temperature of 20° C., wherein said component (A) is a soft polypropylene resin which satisfies the following conditions (1) to (3), which has a sum of mesopentad percentage and racemopentad percentage (mmmm+rrrr) of from 30 to 70% as obtained from 13C-NMR spectrum, in which crystalline block and non-crystalline block portions co-exist in the molecular chain and of which the stereoregularity is controlled.