Propylene Polymer, Composition Comprising the Polymer, and Molded Product Obtained Therefrom

摘要

A propylene polymer which is constituted of 10 to 40 wt % room-temperature n-decane soluble part (D_sol) and 60 to 90 wt % room-temperature n-decane insoluble part (D_insol), comprises skeletons derived from propylene (MP) and at least one kind of olefin (MX) selected from ethylene and C4 or more alpha-olefins, and satisfies all of the following requirements [1] to [5]. The polymer is characterized by having a high melting point and a high molecular weight and is suitable for use in producing various moldings therefrom. [1] the molecular weight distribution (Mw/Mn) of both D_sol and D_insol as determined by GPC is 4.0 or less; [2] the melting point (Tm) of D_insol is 156° C. or more; [3] the sum of the 2,1-bond content and the 1,3-bond content in D_insol is 0.05 mol % or less; [4] the intrinsic viscosity [eta] (dl/g) of D_sol satisfies the relationship 2.2<[eta]<=6.0; and [5] the concentration of skeletons derived from the olefin (MX) in D_insol is 3.0 wt % or less.