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Compositions of ethylene/α-olefin multi-block interpolymer for elastic films and laminates

  • US 7,355,089 B2
  • Filed: 03/15/2006
  • Issued: 04/08/2008
  • Est. Priority Date: 03/17/2004
  • Status: Active Grant
First Claim
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1. A composition suitable for use in elastic films and laminates comprising at least one ethylene/α

  • -olefin interpolymer, wherein the ethylene/α

    -olefin interpolymer;

    (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;


    Tm>



    2002.9+4538.5(d)−

    2422.2(d)2;

    or(b) has a Mw/Mn from about 1.7 to about 3.5, and is characterized by a heat of fusion, Δ

    H in J/g, and a delta quantity, Δ

    T, in degrees Celsius defined as the temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of Δ

    T and Δ

    H have the following relationships;


    Δ

    T>



    0.1299(Δ

    H)+62.81 for Δ

    H greater than zero and up to 130 J/g,
    Δ

    T≧

    48°

    C. for Δ

    H greater than 130 J/g,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 an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the 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 phase;


    Re>

    1481−

    1629(d);

    or(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 ethylene/α

    -olefin interpolymer;

    or(e) 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;

    wherein the ethylene/α

    -olefin interpolymer has a density of from about 0.85 to about 0.89 g/cc and a melt index (I2) of from about 0.5 g/10 min. to about 20 g/10 min and wherein the ethylene/α

    -olefin interpolymer is made using a shuttling agent.

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