Polymer compositions, methods of making the same, and articles prepared from the same
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一种组合物、互聚物的技术，应用在制备EP共聚物的共混物领域，能够解决降低交联效率等问题
Active Publication Date: 2012-05-23
DOW GLOBAL TECH LLC
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also reduces the cross-linking efficiency
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[0124] Olefin multi-block interpolymers and their preparation and use are described in WO 2005 / 090427, US2006 / 0199931, US2006 / 0199930, US2006 / 0199914, US2006 / 0199912, US2006 / 0199911, US2006 / 0199910, US2008 / 0190906, US2006 / 0199910 0199907,US2006 / 0199906,US2006 / 0199905,US2006 / 0199897,US2006 / 0199896,US2006 / 0199887,US2006 / 0199884,US2006 / 0199872,US2006 / 0199744,US2006 / 0199030,US2006 / 0199006和US2006 / 0199983;各公开通过参考 fully incorporated into this application.
[0125] application
[0126] The compositions of the present invention may be used in the preparation of a variety of articles, or components or parts thereof. The compositions of the present invention are particularly useful in foamed crosslinked extruded profile applications, including weatherstripping. The compositions of the present invention can be converted into finished articles of manufacture by any of a variety of conventional methods and equipment. Illustrative methods include, but are not limited to, extrusion, calende...
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Abstract
The invention provides a composition comprising a first composition, which first composition comprises the following: A) a first interpolymer comprising, in polymerized form, ethylene, an a-olefin and a nonconjugated polyene; B) a second interpolymer comprising, in polymerized form, ethylene, an a-olefin and a nonconjugated polyene; and wherein the first composition has an [(ML(1+4, 125 DEG C)) / Mw(conv)]*1000 greater than 0.429 mole / g. The invention also provides a composition comprising a first composition, which first composition comprises the following: A) a first interpolymer comprising, in polymerized form, ethylene, an a-olefin and a nonconjugated polyene; B) a second interpolymer comprising, in polymerized form, ethylene, an a-olefin and a nonconjugated polyene; and wherein the first composition has a Mooney Viscosity (ML, 1+4, 125 DEG C) greater than, or equal to, 70, and has a low shear viscosity (Eta at 0.1 rad / sec) less than, or equal to, 100,000 Pa DEG sec. The invention also provides a composition comprising a first composition, which first composition comprises the following: A) a first interpolymer comprising, in polymerized form, ethylene, an a-olefin and a nonconjugated polyene; B) a second interpolymer comprising, in polymerized form, ethylene, an a-olefin and a nonconjugated polyene; and wherein the first composition has a Mooney Viscosity (ML(1+4, 125 DEG C)) greater than, or equal to, 70, and has an [Mw(abs)] / [Mw(conv)] less than 1.2.
Description
[0001] References to related applications [0002] This application claims priority to US Provisional Application 61 / 225,631, filed July 15, 2009, which is hereby incorporated by reference in its entirety. Background technique [0003] Automotive weather stripping applications require a unique balance of properties required for acceptable product qualification. Polymer formulations must have superior mixing rates (MR) and must produce products with superior mechanical properties. Formulations based on unimodal (usually one polymer) EPDM polymers often have unacceptable mixing rates and / or form products with unacceptable mechanical properties. Formulations based on bimodal (two polymers) EPDM blends are often not reproducible to prepare and lead to other variability in the polymer formulation and final article. There remains a need for EPDM-based formulations that have superior MR and scorch resistance values and that can be used to form automotive weatherstrips with superi...
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