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    • 2. 发明申请
    • ELASTIC FILM GRADE THERMOPLASTIC POLYMER COMPOSITIONS HAVING IMPROVED ELASTIC PERFORMANCE
    • 具有改进的弹性性能的弹性薄膜级热塑性聚合物组合物
    • US20090247689A1
    • 2009-10-01
    • US12441791
    • 2007-09-19
    • Holger WickelHendrik De GrootMarkus Beitzel
    • Holger WickelHendrik De GrootMarkus Beitzel
    • C08L53/02
    • C08L53/025C08K3/013C08K5/0016C08L25/04C08L2666/04
    • The present invention provides an improved block copolymer composition for extruding films having excellent stress relaxation and increased retained tension or load at elevated temperatures, as well as a film cast from this composition. The composition is comprised of (a) 100 parts by weight of a mixture of two or more hydrogenated styrenic block copolymers (HSBC's) having at least two polystyrene end-blocks and a mid-block of a polymerized diene wherein at least 80 mol % of the residual unsaturation has been hydrogenated, wherein HSBC #1 has an apparent number average molecular weight between 35,000 and 90,000 and a polystyrene content between 15 and 40 percent by weight, wherein HSBC #2 has an apparent number average molecular weight between 95,000 and 150,000 and a polystyrene content between 15 and 40 percent by weight, wherein the ration w/w of HSBC #1 versus HSBC #2 is in the range of from 8:1 to 1:8, (b) from 10 to 50 parts by weight per 100 parts by weight of polymer (phr) of a a medium molecular weight polystyrene (2) or a mixture of a low molecular weight polystyrene (1) and a medium molecular weight polystyrene (2), wherein PS (1) has a molecular weight in the range of 500 to 4,000 and PS(2) has a molecular weight in the range of 20,000 to 150,000 and wherein PS(1) and PS(2) are used in a weight ratio of 1:5 to 5:1, (c) from 3 to 50 phr of a filler, and (d) from 30 to 70 phr of a softening agent.
    • 本发明提供了一种用于挤出膜的改进的嵌段共聚物组合物,其具有优异的应力松弛和在升高的温度下增加的保持张力或载荷,以及由该组合物制成的薄膜。 该组合物包含(a)100重量份的具有至少两个聚苯乙烯端嵌段的两个或更多个氢化苯乙烯嵌段共聚物(HSBC)的混合物和聚合二烯的中间嵌段,其中至少80mol% 残余不饱和度被氢化,其中HSBC#1的表观数均分子量在35,000和90,000之间,聚苯乙烯含量在15-40重量%之间,其中HSBC#2的表观数均分子量在95,000和150,000之间, 聚苯乙烯含量在15-40重量%之间,其中HSBC#1与HSBC#2的配比w / w在8:1至1:8的范围内,(b)10至50重量份/ 100重量份的中等分子量聚苯乙烯(2)或低分子量聚苯乙烯(1)和中等分子量聚苯乙烯(2)的混合物的聚合物(phr),其中PS(1)的分子量为 500至4000的范围和PS(2)具有分子 重量在20,000至150,000范围内,并且其中PS(1)和PS(2)以1:5至5:1的重量比,(c)3至50phr的填料使用,和(d) 30至70phr的软化剂。