Propylene-based polymer and method for producing the same, and propylene-based resin composition

A resin composition comprising a propylene-ethylene copolymer component (Z) in an amount of 50.0 to 99.9% by weight, and a propylene-based polymer component (M) in an amount of 0.1 to 50.0% by weight, wherein

• the propylene-ethylene copolymer component (Z) is obtained by sequential production by a multi-stage polymerization method of a crystalline propylene polymer component and a propylene-ethylene random copolymer component, and has following (Z1) characteristics, wherein
• (Z1):
• an amount of the component (CXS-Z) soluble in p-xylene at 25° C. in the component (Z) is 5 to 50% by weight relative to total amount of the component (Z), and amount of the component (CXIS-Z) insoluble in p-xylene at 25° C. in the component (Z) is 50 to 95% by weight relative to total amount of the component (Z), and
• the propylene-based polymer component (M) is obtained by sequential production by a multi-stage polymerization method of a crystalline propylene polymer component and a propylene-ethylene random copolymer component, comprises a component (A) insoluble in p-xylene at 25° C. and a component (B) soluble in p-xylene at 25° C., has a structure wherein the crystalline propylene polymer segment and the amorphous propylene copolymer segment are chemically bonded, and has following (A1) and (B1) characteristics, wherein:
• (A1):
• an amount of the component (A) is 20 to 95% by weight relative to total amount of the component (M);
• and
• (B1):
• Amount an amount of the component (B) is 5 to 80% by weight relative to total amount of the component (M).

A resin composition comprising a propylene-ethylene copolymer component (Z) in an amount of 50.0 to 99.9% by weight, and a propylene-based polymer component (M) in an amount of 0.1 to 50.0% by weight, wherein

• the propylene-ethylene copolymer component (Z) is obtained by sequential production by a multi-stage polymerization method of a crystalline propylene polymer component and a propylene-ethylene random copolymer component, and has following (Z1) characteristics, wherein
• (Z1):
• an amount of the component (CXS-Z) soluble in p-xylene at 25° C. in the component (Z) is 5 to 50% by weight relative to total amount of the component (Z), and amount of the component (CXIS-Z) insoluble in p-xylene at 25° C. in the component (Z) is 50 to 95% by weight relative to total amount of the component (Z), and
• the propylene-based polymer component (M) is produced sequentially by a multi-stage polymerization method, wherein the propylene-based polymer component (M) comprises a component (A) insoluble in p-xylene at 25° C. comprising (A1) to (A4) characteristics, a component (B) soluble in p-xylene at 25° C. comprising (B1) to (B2) characteristics, and (M1) to (M3) characteristics, wherein:
• (M1):
• a weight average molecular weight (Mw) of the component (M), measured with GPC is 100,000 to 1,000,000,
• (M2):
• a content of component insoluble in hot p-xylene in the component (M) is 0.3% by weight or lower relative to total amount of the component (M),
• (M3):
• a degree of strain hardening (λ max) of said component (M) in measurement of elongational viscosity is 2.0 or higher,
• (A1):
• an amount of the component (A) is 20 to 95% by weight relative to total amount of the component (M),
• (A2):
• a weight average molecular weight (Mw) of the component (A) measured with GPC is 100,000 to 1,000,000,
• (A3):
• an isotactic triad fraction (mm) of the component (A), measured with 13C-NMR is 93% or more, and
• (A4):
• a degree of strain hardening (λ max) of the component (A), in measurement of elongational viscosity is 2.0 or higher.
• (B1):
• an amount of the component (B) is 5 to 80% by weight relative to total amount of the component (M), and
• (B2):
• a weight average molecular weight (Mw) of the component (B), measured with GPC, is 100,000 to 1,000,000.