| 摘要 |
<p>A process for producing a propylene polymer is provided to enable unwinding and rewinding of a surface protection film, to ensure proper surface roughness and excellent transparency and to perform examination of adherent. A process for producing a propylene polymer comprises the steps of bulk-polymerizing propylene in the presence of an olefin polymerization catalyst over 2 layers; polymerizing propylene and other olefin in the presence of the polymer obtained from the first step; and assembling the polymer obtained from the second step. The manufactured propylene-based polymer satisfy (i) melt flow rate 1-10 g/min, (ii) n-decane-soluble components 5-15 weight %, (iii) [eta]ep/[eta]h 0.8-1.2, wherein [eta]ep is intrisic viscosity of soluble component and [eta]h is intrisic viscosity of insoluble component, (iv) 40 mol% or less of the content less of an ethylene unit in n-decane soluble component.</p> |
