Patent ID: 8236131
Filing Date: 2012-08-07
Classification: B32B,C08L,Y10T

Abstract:
1. A thermoplastic resin composition (X) comprising the following components (A) to (C): (A) isotactic polypropylene containing not less than 90% by mol of constituent units derived from propylene, in an amount of 1 to 65% by weight, (B) a propylene copolymer which is a copolymer of propylene and at least one α-olefin of 2 to 20 carbon atoms excluding propylene and whose melting point, as measured by a differential scanning calorimeter (DSC), is lower than 65° C. or is not observed, wherein the propylene copolymer contains constituent units derived from propylene in an amount of 56 to 99% by mol and is in an amount of 30 to 94% by weight, and (C) a 1-butene-based polymer which is selected from the group consisting of a 1-butene homopolymer; a copolymer of 1-butene and an α-olefin of 2 to 20 carbon atoms excluding 1-butene (C-1), wherein the copolymer (C-1) contains constituent units derived from 1-butene in an amount of 60 to 99% by mol; and a copolymer of 1-butene, propylene and at least one α-olefin (C-2), wherein the at least one α-olefin is an arbitrary component and is selected from ethylene and α-olefin of 5 to 20 carbon atoms, and wherein the copolymer (C-2) contains constituent units derived from 1-butene in an amount of 16 to 40% by mol, and the total amount of constituent units derived from propylene and constituent units derived from the at least one α-olefin is in an amount of 60 to 84% by mol, with the proviso that when the total amount of constituent units derived from 1-butene, constituent units derived from propylene and constituent units derived from the at least one α-olefin is 100% by mol, and the amount of the constituent units derived from the at least one α-olefin is in a range of 0 to 5% by mol based on 100% by mol of the total amount of the constituent units derived from 1-butene, propylene and the at least one α-olefin; wherein the melting point of the 1-butene-based polymer, as measured by a differential scanning calorimeter (DSC), is in a range of 65 to 135° C., and wherein the 1-butene-based polymer is in an amount of 5 to 60% by weight, and wherein the total amount of said components (A) to (C) is 100% by weight.