专利名称：POLYMER BLENDS AND NONWOVEN
ARTICLES THEREFROM
发明人：MEHTA, Aspy, K.,CHENG, Chia, Young,DATTA,
Sudhin,LI, Wen,LIN, Chon, Y.,IYER, Srivatsan, S.
申请号：EP05853568.3申请日：20051209公开号：EP1833910B1公开日：20090826
摘要：This invention relates to a nonwoven article comprising a heterogeneous blendcomprising: 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), eachsemi-crystalline polymer comprising propylene and from 0 to 5 weight % alpha-olefincomonomer (based upon the weight of the polymer), said semi-crystalline polymers eachhaving a melting point between 100 and 170°C and a melt flow rate of 2000 dg/min orless; and 2) from 1 to 40 weight % of one or more semi-amorphous polymers (basedupon the weight of the semi-crystalline and semi-amorphous polymers), each semi-amorphous polymer comprising pro Pylene and from 10 to 25 weight % of one or moreC2 and or C4 to C10 alpha-olefin comonomers, said semi-amorphous polymers eachhaving: a) heat of fusion of 4 to 70 J/g; b) a Melt Flow Rate of 01. To 2000 dg/min; c) anintermolecular compositional distribution as determined by thermal fractionation inhexane such that 85% by weight or more of the polymer is isolated as one or twoadjacent, soluble fractions with the balance of the polymer in immediately preceding orsucceeding 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% comonomercontent of the copolymer; and d) an Mw/Mn of 1.5 to 4, and e) a propylene triad tacticity,as measured by 13C NMR, of 75% or greater; where the blend of the semi-crystalline andsemi-amorphous polymers comprises less than 5 weight % filler, based upon the weightof the polymers and the filler, and the blend has: i) an MFR greater than 10 dg/min; and ii)a Permanent Set of greater than 65% (as measured on a 125 mil thick molded part); andwhere the nonwoven article has a hand of 40 g or less at a fabric basis weight of 35 gsm.
申请人：EXXONMOBIL CHEM PATENTS INC
地址：US
国籍：US
代理机构：UEXKÜLL & STOLBERG
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