Patent ID: 8003223
Filing Date: 2011-08-23
Classification: B32B,C08J,C08L,Y10T

Abstract:
1. A heat-sealable propylene-based polymer composition comprising: a propylene polymer composition (A) comprising a propylene polymer component (a1) and a propylene/ethylene random copolymer component (a2) having a propylene unit content of 63 to 77% by mol and an ethylene unit content of 23 to 37% by mol, an ethylene/α-olefin random copolymer (B), and a soft propylene polymer composition (D) comprising a propylene polymer (d1) and a propylene/ethylene/α-olefin random copolymer (d2) which has an ethylene content of 2 to 30% by mol and an α-olefin content of 2 to 30% by mol and whose melting point, as measured by a differential scanning calorimeter (DSC), is not observed, wherein: (1) a mass ratio of the propylene polymer component (a1) to the propylene/ethylene random copolymer component (a2) in the propylene polymer composition (A) is in the range of 60:40 to 97:3, and the propylene/ethylene random copolymer component (a2) has an intrinsic viscosity [η] of 1 to 7 dl/g, (2) the ethylene/α-olefin random copolymer (B) has a density of 0.865 to 0.910 g/cm (3) a mass ratio of the propylene polymer (d1) to the propylene/ethylene/α-olefin random copolymer (d2) in the soft propylene polymer composition (D) is in the range of 5:95 to 70:30, and containing the propylene polymer composition (A) in an amount of 50 to 90% by mass, the ethylene/α-olefin random copolymer (B) in an amount of 3 to 25% by mass and the soft propylene polymer composition (D) in an amount of 0.5 to 40% by mass ((A)+(B)+(D) =100% by mass).