Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Polyolefin film for stretch packaging
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&#8242;) of from 5.0&times;108 dyn/cm2 to 5.0&times;109 dyn/cm2 and a loss tangent (tan&dgr;) 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&deg; 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.
Mitsubishi Plastics, Inc.
B B B C C C C C C C B C C C Y B C B C Y C C C C B Y C C C
B32B B32B B32B C08L C08L C08L C08L C08L C08L C08L B32B C08L C08J C08F Y10T B32B C08J B32B C08L Y10T C08F C08F C08J C08L B32B Y10T C08L C08L C08L
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Hideki Kouichirou Takuya
Sasaki Taniguchi Kitamura