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    • 13. 发明申请
    • POLYMER COMPOSITION AND PROCESS TO MANUFACTURE HIGH MOLECULAR WEIGHT-HIGH DENSITY POLYETHYLENE AND FILM THEREFROM
    • 聚合物组合物和制备高分子量密度聚乙烯和其膜的方法
    • WO2004101674A1
    • 2004-11-25
    • PCT/US2004/013975
    • 2004-05-05
    • DOW GLOBAL TECHNOLOGIES INCMICHIE, William, J., Jr.NEUBAUER, Anthony, C.COBLER, Brad, A.BAKER, Carl, F.
    • MICHIE, William, J., Jr.NEUBAUER, Anthony, C.COBLER, Brad, A.BAKER, Carl, F.
    • C08L23/16
    • C08F210/16B29C47/0014B29C47/0021B29C47/38B29C47/404C08F8/00C08L23/0815C08L2205/02C08L2308/00Y10S525/938C08F10/02C08F2/001C08L2666/06C08F210/14C08F2500/12C08F2500/07C08F2500/04C08F2500/09C08F2500/26
    • The present invention includes a multimodal polyethylene composition has (1) a density of at least about 0.940 g/cm 3 as measured by ASTM Method D-1505; (2) a melt flow index (I 5 ) of from about 0.2 to about 1.5 g/10 min (as measured by ASTM D-1238, measured at 190 °C and 5 kilograms); (3) a melt flow index ratio (I 21 /I 5 ) of from about 20 to about 50; (4) a molecular weight distribution, Mw/Mn, of from about 20 to about 40; (5) a bubble stability measured on specified equipment according to specified conditions for a film of about 6 X 10 -6 m thickness of at least about 1.22 m/s line speed, at least about 45 kg/hr (0.013 kg/sec) output rate, or at least about 0.5 lb/hr/rpm (0.0000011 kg/s/rps) specific output rate or a combination thereof; the composition comprising; and (6) a dart impact on 12.5 micron (1.25 X 10 -5 m) film of at least 300 g; measured according to ASTM 1709, Method A; (A) a high molecular weight fraction which; (a) is present in an amount of from about 30 to about 70 weight percent (based on the total weight of the composition); (b) has a density of at least about 0.860 g/cm 3 as measured by ASTM D-1505; (c) has a melt flow index (I 21 ) of from about 0.01 to about 50 g/10 min (as measured by ASTM D-1238, measured at 190 °C and 21.6 kilograms); and (d) a melt flow index ratio (I 21 /I 5 ) of from about 6 to about 12; and (B) a low molecular weight fraction which; (a) is present in an amount of from about 30 to about 70 weight percent (based on the total weight of the composition); (b) has a density of at least about 0.900 g/cm 3 as measured by ASTM D-1505; (c) has a melt flow index (I 2 ) of from about 0.5 to about 3000 g/10 min (as measured by ASTM D-1238, measured at 190 °C and 2.16 kilograms); (d) a melt flow index ratio (I 21 /I 5 ) of from about 5 to about 15; and (e) is prepared using a mole ratio of alpha olefin to ethylene of less than or equal to about 0.001:1. The invention also includes a process for producing a multimodal ethylene polymer, which process comprises the following steps: (1) contacting in a first gas phase fluidized bed reactor under polymerization conditions and at a temperature of from about 70 °C to about 110 °C, a supported titanium magnesium catalyst precursor, cocatalyst, and a gaseous composition, the gaseous composition having; (i) a mole ratio of alpha-olefin to ethylene of from about 0.01:1 to about 0.8:1; and optionally (ii) a mole ratio of hydrogen to ethylene of from about 0.001:1 to about 0.3:1, to produce a high molecular weight polymer(HMW); and (2) transferring the HMW polymer from step 1 to a second gas phase fluidized bed reactor under polymerization conditions and at a temperature of from about 70 °C to about 110 °C, with a gaseous composition having; (i) a mole ratio of alpha-olefin to ethylene of from about 0.0005:1 to about 0.01:1; and (ii) a mole ratio of hydrogen (if present) to ethylene of from about 0.01:1 to about 3:1 to form a polymer blend product; and (3) melting the polymer blend product in an extruder having a mixer vent wherein; (ii) the mixture vent has an oxygen concentration of from about 0.05 to about 6 volume percent oxygen in nitrogen; and (ii) the extrusion temperature is sufficient to melt the polymer and achieve tailoring in the presence of oxygen; and (4) passing the molten polymer blend through one or more active screens, wherein in the 5 case of two or more active screens, the screens are positioned in series, each active screen having a micron retention size of from about 2 to about 70, at a mass flux of about 1.0 to about 20 kg/s/m 2 ) to form a screened molten polymer blend. The composition is preparable by the process and is preferably prepared by the process. The resin exhibits improved extrusion processing at high commercial line speeds, while exhibiting an excellent balance of 10 bubble stability, dart drop, and FAR, as well as outstanding NCLS with good flexural modulus.
    • 本发明包括多峰聚乙烯组合物,其具有(1)通过ASTM方法D-1505测量的至少约0.940g / cm 3的密度; (2)约0.2至约1.5g / 10min的熔体流动指数(I5)(通过ASTM D-1238测量,在190℃和5千克下测量); (3)约20至约50的熔体流动指数比(I21 / I5); (4)约20至约40的分子量分布Mw / Mn; (5)根据特定设备测量的约6×10 -6μm厚度的至少约1.22m / s线速度的膜的规定条件下测量的气泡稳定性,至少约45kg / hr(0.013kg / 秒)或至少约0.5lb / hr / rpm(0.0000011kg / s / rps)的特定输出速率或其组合; 所述组合物包含: 和(6)至少300g的12.5微米(1.25×10 -5)膜的飞镖撞击; 根据ASTM 1709,方法A测量; (A)高分子量级分; (a)的存在量为约30至约70重量%(基于组合物的总重量); (b)通过ASTM D-1505测量的密度为至少约0.860g / cm 3; (c)具有约0.01至约50g / 10min的熔体流动指数(I21)(通过ASTM D-1238测量,在190℃和21.6千克下测量); 和(d)约6至约12的熔体流动指数比(I21 / I5); 和(B)低分子量级分; (a)的存在量为约30至约70重量%(基于组合物的总重量); (b)通过ASTM D-1505测量的密度为至少约0.900g / cm 3; (c)具有约0.5至约3000g / 10min的熔体流动指数(I 2)(通过ASTM D-1238测量,在190℃和2.16千克下测量); (d)约5至约15的熔体流动指数比(I21 / I5); 和(e)使用α-烯烃与乙烯的摩尔比小于或等于约0.001:1制备。 本发明还包括一种生产多峰乙烯聚合物的方法,该方法包括以下步骤:(1)在聚合条件下和第一气相流化床反应器中在约70℃至约110℃的温度下接触 ,负载型钛镁催化剂前体,助催化剂和气态组合物,所述气态组合物具有: (i)α-烯烃与乙烯的摩尔比为约0.01:1至约0.8:1; 和(ii)氢与乙烯的摩尔比为约0.001:1至约0.3:1,以产生高分子量聚合物(HMW); 和(2)在聚合条件下和在约70℃至约110℃的温度下将HMW聚合物从步骤1转移到第二气相流化床反应器,气态组合物具有: (i)α-烯烃与乙烯的摩尔比为约0.0005:1至约0.01:1; 和(ii)氢(如果存在)与乙烯的摩尔比为约0.01:1至约3:1以形成聚合物共混物; 和(3)在具有混合器排气口的挤出机中熔化聚合物共混物,其中: (ii)混合物通气口的氧浓度为f