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    • 9. 发明专利
    • HOMOGENEOUS POLYMER BLEND AND ARTICLES THEREFROM
    • CA2588770C
    • 2010-03-23
    • CA2588770
    • 2005-12-09
    • EXXONMOBIL CHEM PATENTS INC
    • MEHTA ASPY KCHENG CHIA YOUNGDATTA SUDHINLI WENLIN CHON YIYER SRIVATSAN SRINIVAS
    • C08L23/10
    • This invention relates to homogeneous blends of: 1) from 60 to 99 weight percent of one or more semi-crystalline polymers (based upon the weight of the semi-crystalline and semi-amorphous polymers), each semi-crystalline polymer comprising propylene and from 0 to 5 weight % alpha-olefin comonomer (based upon the weight of the polymer), said semi~crystalline polymers each having a melting point between 100 and 170~C and a melt flow rate of 200 dg/min or less; and 2) from 1 to 40 weight % of one or more semi-amorphous polymers (based upon the weight of the semi-crystalline and semi-amorphous polymers), each semi-amorphous polymer comprising propylene and from 5 to 12 weight % of one or more C2 and or C4 to C10 alpha-olefin comonomers, said semi-amorphous polymers each having: a) 10 to 50 percent crystallinity or less; b) a melt flow rate of 200 dg/min or less; c) a DSC melting point (second melt Tm) of 130~C or less; d) an intermolecular composition distribution as determined by thermal fractionation in hexane such that 85% by weight or more of the polymer is isolated as one or two adjacent, soluble fractions with the balance of the polymer in immediately preceding or succeeding fractions; and wherein each of these fractions has a wt% comonomer content with a difference of no greater than 20 wt% relative to the average wt% comonomer content of the copolymer; e) an Mw/Mn of 1.5 to 4, f) a triad tacticity of three propylene units, as measured by 13CNMR, of 75% or greater, for use in films, fibers, non-wovens, molded articles and the like.