Patent ID: 7563847
Filing Date: 2009-07-21
Classification: C08J,C08L

Abstract:
1. A polymer composition comprising: from 30 to 98% by weight of a polymer (A) satisfying Requirements (A-1) through (A-3) defined below, from 1 to 30% by weight of a polymer (B) satisfying Requirements (B-1) through (B-3) defined below, and from 1 to 50% by weight of a polymer (C) satisfying Requirements (C-1) through (C-5), the polymer composition satisfying Requirements (1) and (2) defined below, wherein said amounts of the polymers (A), (B) and (C) are based on a combined amount of the polymers (A), (B) and (C): Requirement (1): the content of a 20° C. xylene-soluble portion of the polymer composition is from 5 to 45% by weight, Requirement (2): a 20° C. xylene-soluble portion of the polymer composition has an intrinsic viscosity of 1.3 dl/g or higher, Requirement (A-1): the polymer is a copolymer of propylene and α-olefin having 4 or more carbon atoms or a copolymer of propylene, α-olefin having 4 or more carbon atoms and ethylene, Requirement (A-2): the polymer has a content of structural units derived from α-olefin having 4 or more carbon atoms of from 3 to 40% by weight, Requirement (A-3): the polymer has a content of structural units derived from ethylene of from 0.1 to 5% by weight when the polymer is a copolymer of propylene, α-olefin having 4 or more carbon atoms and ethylene, Requirement (B-1): the polymer is a homopolymer of 1-butene, a copolymer of 1-butene and ethylene, a copolymer of 1-butene and propylene, a copolymer of 1-butene and α-olefin having 4 or more carbon atoms other than 1-butene, a copolymer of 1-butene, ethylene and propylene or a copolymer of 1-butene, ethylene and α-olefin having 4 or more carbon atoms other than 1-butene, Requirement (B-2): the polymer has a melting point of not lower than 60° C. but lower than 125° C., Requirement (B-3): the polymer has a content of structural units derived from 1-butene of from 60 to 99.9% by weight when the polymer is a copolymer of 1-butene and ethylene, a copolymer of 1-butene and propylene, a copolymer of 1-butene and α-olefin having 4 or more carbon atoms other than 1-butene, a copolymer of 1-butene, ethylene and propylene or a copolymer of 1-butene, ethylene and α-olefin having 4 or more carbon atoms other than 1-butene, Requirement (C-1): the polymer is a copolymer of propylene and ethylene, a copolymer propylene and α-olefin having 4 or more carbon atoms, or a copolymer of propylene, ethylene and α-olefin having 4 or more carbon atoms, Requirement (C-2): the polymer has a content of structural units derived from ethylene of from 0 1 to 10% by weight when the polymer is a copolymer of propylene and ethylene or a copolymer of propylene, ethylene and α-olefin having 4 or more carbon atoms, wherein this content is based on the weight of the polymer, Requirement (C-3): the polymer has a content of structural units derived from α-olefin having 4 or more carbon atoms of from 0.1 to 10% by weight when the polymer is a copolymer of propylene and α-olefin having 4 or more carbon atoms or a copolymer of propylene, ethylene and α-olefin having 4 or more carbon atoms, Requirement (C-4): the polymer has a content, based on the weight of the polymer, of structural units derived from α-olefin having 4 or more carbon atoms less than that of polymer (A) when the polymer is a copolymer of propylene and α-olefin having 4 or more carbon atoms or a copolymer of propylene, ethylene and α-olefin having 4 or more carbon atoms, and Requirement (C-5): the polymer has a melting point of not lower than 125° C. but lower than 150° C.