Patent ID: 8273826
Filing Date: 2012-09-25
Classification: C08L

Abstract:
1. An impact modified composition comprising: A) a thermoplastic polymer composition; and B) an impact-modifying amount of a multi-block ethylene/α-olefin interpolymer comprising hard segments and soft segments, wherein the amount of the hard segments is at least 30 weight percent to 70 weight percent, based on the total weight of the multi-block ethylene/α-olefin interpolymer, the hard segments having greater than 95 weight percent units derived from ethylene, the soft segments having from 8 mole percent to 45 mole percent α-olefin content and wherein the multi-block ethylene/α-olefin interpolymer is polymerized in the presence of a chain shuttling agent and; (a) has a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship: (b) has a Mw/Mn from about 1.7 to about 3.5, and is characterized by a heat of fusion, ΔH in J/g, and a delta quantity, ΔT, in degrees Celsius defined as the temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of ΔT and ΔH have the following relationships: wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30° C.; or (c) is characterized by and elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the multi-block ethylene/α-olefin interpolymer, and has a density, d, in grams/cubic centimeter, wherein the numerical values of Re and d satisfy the following relationship when ethylene/α-olefin interpolymer is substantially free of a cross-linked phrase: (d) has a molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a molar comonomer content of at least 5 percent higher than that of a comparable random ethylene interpolymer fraction eluting between the same temperatures, wherein said comparable random ethylene interpolymer has the same comonomer(s) and has a melt index, density, and molar comonomer content (based on the whole polymer) within 10 percent of that of the multi-block ethylene/α-olefin interpolymer; or (e) has at least one molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a block index of at least 0.5 and up to about 1; or (f) has an average block index greater than zero and up to about 1.0; or (g) has a storage modulus at 25° C., G′(25° C.), and a storage modulus at 100° C. G′(100° C.), wherein the ratio of G′(25° C.) to G′(100° C.) is in the range of about 1:1 to about 9:1.