PROPYLENE POLYMER, COMPOSITION CONTAINING THE POLYMER, AND MOLDED OBJECTS OBTAINED FROM THESE

摘要

A propylene polymer which is constituted of 10-40 wt.% component (Dsol) soluble in room-temperature n-decane and 60-90 wt.% component (Dinsol) insoluble in room-temperature n-decane, comprises skeletons derived from propylene (MP) and one or more olefins (MX) selected among ethylene and C4 and higher E-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. It is suitable for use in producing various moldings therefrom. [1] The molecular weight distributions (Mw/Mn) of Dsol and D insol as determined by GPC each is 4.0 or lower. [2] The melting point (Tm) of Dinsol is 156°C or higher. [3] The sum of the 2, 1-bond content and the 1,3-bond content in Dinsol is 0.05 mol% or lower. [4] The intrinsic viscosity [Q] (dL/g) of Dsol satisfies the relationship 2.2<[Q]<=6.0. [5] The concentration of skeletons derived from the olefin(s) (MX) in Dinsol is 3.0 wt. % or lower.