| 摘要 |
PROBLEM TO BE SOLVED: To produce a polypropylene thin-walled molded object, especially, a polypropylene extrusion laminated film by extrusion molding without adding a stabilizer. SOLUTION: Polypropylene produced by using a metallocene catalyst is extruded without adding at least a stabilizer to produce a thin-walled molded object. In this case, polypropylene pref. has an isotactic pentad ratio (mmmm) of 0.900-0.949, a hetero-bond caused by 2,1-insertion reaction and 1,3-insertion reaction of 0-1 mol%, a wt. average mol.wt. (Mw) of 30,000-1,000,000, a ratio (Mw/Mn) of a wt. average mol.wt. (Mw) to a number average mol.wt. (Mn) of 1.5-3.8 and a specifying necessary condition wherein, when the temp. of orthodichlorobenzene is raised continuously or stepwise and the elution amt. of polypropylene to orthochlorobenzene at each temp. is measured, the position of a main elution peak is 95 deg.C or higher and the elution amt. within the temp. range of±10<= centering around the main elution peak is 90% or more of the total elution amt. at temp. higher than 0 deg.C.
|
