公开(公告)号：US20130323450A1

公开(公告)日：2013-12-05

申请号：US13660777

申请日：2012-10-25

Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

Inventor： Paul J. DesLauriers ,  Yongwoo Inn ,  Qing Yang ,  Ashish M. Sukhadia ,  David C. Rohlfing ,  Pamela L. Maeger

IPC: C08F110/02

CPC classification number: C08F110/02 ,  C08L23/04 ,  C08L23/06 ,  F16L9/00 ,  F16L9/12 ,  G01N3/24 ,  G01N11/04 ,  G06F17/10 ,  G06F19/703 ,  Y10T428/139

Abstract: A method of preparing a medium-density polyethylene pipe comprising melting a multimodal metallocene-catalyzed polyethylene resin to form a molten polyethylene, wherein the multimodal metallocene-catalyzed polyethylene resin has a density of from about 0.925 g/ml to about 0.942 g/ml, a magnitude of slip-stick greater than about 300 psi, a stress for smooth to matte transition of greater than about 90 kPa of stress, and a shear rate for smooth to matte transition greater than about 10 s−1, wherein the magnitude of slip-stick, stress for smooth to matte transition, and shear rate for smooth to matte transition are determined by a capillary rheology test; and forming the molten polyethylene resin into pipe. A pipe prepared from a multimodal metallocene-catalyzed polyethylene resin having a density of from about 0.925 g/ml to about 0.942 g/ml, a magnitude of slip-stick greater than about 300 psi; a stress for smooth to matte transition of greater than about 90 kPa, and a shear rate for smooth to matte transition greater than about 10 s−1, wherein the magnitude of slip-stick, stress for smooth to matte transition, and shear rate for smooth to matte transition are determined by a capillary rheology test.

Abstract translation: 一种制备中密度聚乙烯管的方法，包括熔化多峰茂金属催化的聚乙烯树脂以形成熔融聚乙烯，其中多峰茂金属催化的聚乙烯树脂的密度为约0.925g / ml至约0.942g / ml， 大于约300psi的滑棒的大小，大于约90kPa应力的平滑无光泽转变的应力和大于约10s -1的平滑到无光泽转变的剪切速率，其中滑移的大小 通过毛细管流变学测试确定平滑无光泽过渡的应力和平滑到无光泽过渡的剪切速率; 并将熔融的聚乙烯树脂形成管。 由密度为约0.925g / ml至约0.942g / ml的多峰金属茂催化的聚乙烯树脂制备的管，滑棒的大小大于约300psi; 大于约90kPa的平滑无光泽转变的应力，以及大于约10s -1的平滑到无光泽转变的剪切速率，其中滑棒的大小，光滑到无光泽的转变的应力和剪切速率 通过毛细管流变学测试确定光滑的无光泽转变。

公开(公告)号：US08771816B2

公开(公告)日：2014-07-08

申请号：US13660777

申请日：2012-10-25

Applicant: Chevron Phillips Chemical Company LP

Inventor： Paul J. DesLauriers ,  Yongwoo Inn ,  Qing Yang ,  Ashish M. Sukhadia ,  David C. Rohlfing ,  Pamela L. Maeger

IPC: B29C47/00 ,  C08F110/02 ,  F16L9/00 ,  F16L9/12

CPC classification number: C08F110/02 ,  C08L23/04 ,  C08L23/06 ,  F16L9/00 ,  F16L9/12 ,  G01N3/24 ,  G01N11/04 ,  G06F17/10 ,  G06F19/703 ,  Y10T428/139

Abstract: A method of preparing a medium-density polyethylene pipe comprising melting a multimodal metallocene-catalyzed polyethylene resin to form a molten polyethylene, wherein the multimodal metallocene-catalyzed polyethylene resin has a density of from about 0.925 g/ml to about 0.942 g/ml, a magnitude of slip-stick greater than about 300 psi, a stress for smooth to matte transition of greater than about 90 kPa of stress, and a shear rate for smooth to matte transition greater than about 10 s−1, wherein the magnitude of slip-stick, stress for smooth to matte transition, and shear rate for smooth to matte transition are determined by a capillary rheology test; and forming the molten polyethylene resin into pipe. A pipe prepared from a multimodal metallocene-catalyzed polyethylene resin having a density of from about 0.925 g/ml to about 0.942 g/ml, a magnitude of slip-stick greater than about 300 psi; a stress for smooth to matte transition of greater than about 90 kPa, and a shear rate for smooth to matte transition greater than about 10 s−1, wherein the magnitude of slip-stick, stress for smooth to matte transition, and shear rate for smooth to matte transition are determined by a capillary rheology test.

Abstract translation: 一种制备中密度聚乙烯管的方法，包括熔化多峰茂金属催化的聚乙烯树脂以形成熔融聚乙烯，其中多峰茂金属催化的聚乙烯树脂的密度为约0.925g / ml至约0.942g / ml， 大于约300psi的滑棒的大小，大于约90kPa应力的平滑无光泽转变的应力和大于约10s -1的平滑到无光泽转变的剪切速率，其中滑移的大小 通过毛细管流变学测试确定平滑无光泽过渡的应力和平滑到无光泽过渡的剪切速率; 并将熔融的聚乙烯树脂形成管。 由密度为约0.925g / ml至约0.942g / ml的多峰金属茂催化的聚乙烯树脂制备的管，滑棒的大小大于约300psi; 大于约90kPa的平滑无光泽转变的应力，以及大于约10s -1的平滑到无光泽转变的剪切速率，其中滑棒的大小，光滑到无光泽的转变的应力和剪切速率 通过毛细管流变学测试确定光滑的无光泽转变。