Patent ID: 8324335

Claim:
A propylene-based polymer comprising component (A) insoluble in p-xylene at 25° C. and component (B) soluble in p-xylene at 25° C., wherein (i) a weight average molecular weight (Mw) measured with GPC is from 100,000 to 1,000,000, (ii) a content of a component insoluble in p-xylene at 140° C. is 0.3% by weight or lower, and (iii) a degree of strain hardening (λ max) in measurement of elongational viscosity is 2.0 or higher, wherein the component (A) is the component insoluble in p-xylene at 25° C. (CXIS) comprising following characteristics (A1) to (A5) wherein: (A1) a content thereof is 20% by weight or more and less than 95% by weight relative to total weight of the polymer; (A2) a weight average molecular weight (Mw) measured with GPC is 100,000 to 1,000,000; (A3) an isotactic triad fraction (mm) measured with 13 C-NMR is 93% or more; (A4) a degree of strain hardening (X max) in measurement of elongational viscosity is 2.0 or higher; and (A5) said component (A) insoluble in p-xylene at 25° C. (CXIS) comprises a propylene unit and an ethylene unit or an α-olefin unit, and the component (B) is the component soluble in p-xylene at 25° C. (CXS) comprising following characteristics (B1) to (B3) wherein: (B1) a content thereof is 5% by weight or more and less than 80% by weight relative to total weight of the polymer; (B2) a weight average molecular weight (Mw) measured with GPC is 100,000 to 1,000,000; and (B3) said component (B) soluble in p-xylene at 25° C. (CXS) comprises a propylene unit and an ethylene unit and/or an α-olefin unit.