POLYPROPYLENE INFLATION FILM

摘要

PURPOSE: To enhance rigidity, impact resistance and transparency under stable molding conditions by molding a polypropylene compsn. consisting of crystalline polypropylene and a condensate of a copolymer of propylene having a specific crosslinking structure and alkenylsilane in a molten state. CONSTITUTION: A polypropylene compsn. consisting of 100 pts.wt. of crystalline polypropylene (A) and 0.01-20 pts.wt. of a condensate (B) of a propylene/ alkenylsilane copolymer is molded in a molten state. The condensate (B) is soluble in boiled xylene and the value Mw/Mn obtained by dividing the wt. average mol.wt. Mw at the time of the approximation in Gauss distribution with respect to a high mol.wt. region (c), a low mol.wt. region (a) and an intermediate region (b) centering around the peak position of a mol.wt. distribution curve measured by gel permeation chromatography and setting a vertical axis to elution amt. and a horizontal axis to a natural logarithm of a mol.wt. by a number average mol.wt. Mn is set to 5 or more in the high mol.wt. region. A crosslinked structure characterized by that the value calculated by dividing Mw/Mn of the high mol.wt. region by Mw/Mn of the intermediate region is 2 or more is formed.