Patent ID: 6632885
Filing Date: 2003-10-14
Classification: B32B,C08F,C08K,C08L,Y10T

Abstract:
A soft syndiotactic polypropylene composition comprising:(A) a syndiotactic propylene polymer which comprises recurring units (Upr) derived from propylene having a substantially syndiotactic structure, and optionally, recurring units (Uet) derived from ethylene and/or recurring units (Uol) derived from an &agr;-olefin of 4 to 20 carbon atoms, contains the recurring units (Upr) in amounts of 90 to 100% by mol, the recurring units (Uet) in amounts of 0 to 10% by mol and the recurring units (Uol) in amounts of 0 to 9.5% by mol, and has an intrinsic viscosity (&eegr;), as measured in decalin at 135Â° C., of 0.5 to 10 dl/g, (B) an &agr;-olefin polymer which comprises at least one recurring unit derived from an &agr;-olefin selected from &agr;-olefins of 2 to 20 carbon atoms, said at least one recurring unit present in amounts of 50 to 100% by mol, and said polymer has a Young's modulus of not more than 150 MPA, (E) an isotactic propylene polymer which comprises recurring units (Upr) derived from propylene having a substantially isotactic structure, and optionally, recurring units (Uet) derived from ethylene and/or recurring units (Uol) derived from an &agr;-olefin of 4 to 20 carbon atoms, contains the recurring units (Upr) in amounts of 90 to 100% by mol, the recurring units (Uet) in amounts of 0 to 10% by mol and the recurring units (Uol) in amounts of 0 to 9.5% by mol, and has an intrinsic viscosity (&eegr;), as measured in decalin at 135Â° C., of 0.5 to 6 dl/g, and optionally, (C) a crystal nucleating agent and/or (D) an ethylene-based polymer having a density of 0.91 to 0.97 g/cm3, wherein: the weight ratio (A/E) of the syndiotactic propylene polymer (A) to the isotactic propylene polymer (E) is in the range of 99/1 to 1/99, and the weight ratio ((A+E)/B) of the total of the syndiotactic propylene polymer (A) and the isotactic propylene polymer (E) to the &agr;-olefin polymer is in the range of 90/10 to 10/90.