Patent ID: 6818703
Filing Date: 2004-11-16
Classification: C08J,C08L,Y10T

Abstract:
A propylene-based resin composition comprising:from 40 to 99% by weight of a propylene-based copolymer (X) consisting of from 1 to 30% by weight of component (A) that is a copolymeric component which is made up of propylene and an &agr;-olefin having 4 or more carbon atoms and which satisfies Requirement 1 defined below or a copolymeric component which is made up of propylene, an &agr;-olefin having 4 or more carbon atoms and ethylene and which satisfies Requirement 1 and Requirement 2 defined below and from 70 to 99% by weight of component (B) that is a copolymeric component which is made up of propylene and an &agr;-olefin having 4 or more carbon atoms and which satisfies Requirement 3 defined below or a copolymeric component which is made up of propylene, an &agr;-olefin having 4 or more carbon atoms and ethylene and which satisfies Requirement 3 and Requirement 4 defined below, wherein the copolymer (X) satisfies Requirement 5 defined below, and from 1 to 60% by weight of a propylene-based copolymer (Y) made up of propylene and an &agr;-olefin and/or ethylene, the copolymer (Y) having a content of propylene of from 86 to 97% by weight and a combined content of ethylene and the &agr;-olefin of from 3 to 14% by weight, provided that each of the percentages of the amounts of the component (A) and the component (B) is based on the amount of the copolymer (X) and the sum of the percentages of the amounts of the components (A) and (B) is 100% by weight, each of the percentages of the amounts of the copolymer (X) and the copolymer (Y) is based on the combined amount of the copolymers (X) and (Y), and the content of propylene in the copolymer (Y) and the combined content of ethylene and the &agr;-olefin in the copolymer (Y) are respectively based on the combined amount of propylene, ethylene and the &agr;-olefin in the copolymer (Y): Requirement 1: The content of &agr;-olefin having 4 or more carbon atoms in the component is not less than 1 mol % but less than 15 mol %. Requirement 2: The content of ethylene in the component is not more than 5 mol %. Requirement 3: The content of &agr;-olefin having 4 or more carbon atoms in the component is from 15 mol % to 30 mol %. Requirement 4: The content of ethylene in the component is not more than 5 mol %. Requirement 5: In measurement of a DSC curve of the material, the amount of heat absorption within the temperature range of from Tâˆ’10 (Â° C.) to T+10 (Â° C.) accounts for from 15 to 36% the amount of heat absorption within the temperature range of from 53Â° C. to 170Â° C., wherein T denotes a temperature (Â° C.) at which a maximum endothermic peak appears.