| US 7,592,397 B2 | ||
| Cap liners, closures, and gaskets from multi-block polymers | ||
| Ronald P. Markovich, Houston, Tex. (US); Dale M. Elley-Bristow, Sarnia (Canada); Miguel A. Prieto, Richterswil (Switzerland); Russell P. Barry, Samstagern (Switzerland); Felipe Martinez, Houston, Tex. (US); Daniel J. Falla, Sarnia (Canada); and Julien H. J. M. Damen, Mettmenstetten (Switzerland) | ||
| Assigned to Dow Global Technologies Inc., Midland, Mich. (US) | ||
| Appl. No. 11/908,951 PCT Filed Mar. 15, 2006, PCT No. PCT/US2006/009501 § 371(c)(1), (2), (4) Date May 21, 2008, PCT Pub. No. WO2006/113000, PCT Pub. Date Oct. 26, 2006. |
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| Prior Publication US 2008/0269388 A1, Oct. 30, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C08F 8/00 (2006.01); C08L 9/00 (2006.01); C08L 23/04 (2006.01) | ||
| U.S. Cl. 525—236 [525/191; 525/232; 525/240] | 13 Claims |
| 1. A polymer blend composition comprising:
(A) at least one ethylene/α-olefin interpolymer and (B) at least one other polymer, wherein the ethylene/α-olefin interpolymer
is a block interpolymer 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:
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, 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:
ΔT>−0.1299(ΔH)+62.81 for ΔH greater than zero and up to 130 J/g,
ΔT≧48° C. for ΔH 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; or
(f) 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 and a molecular weight distribution, Mw/Mn, greater
than about 1.3; or
(g) an average block index greater than zero and up to about 1.0 and a molecular weight distribution, Mw/Mn, greater than
about 1.3.
|