| 发明名称 | Controlling melt fracture in bimodal resin pipe | ||
| 摘要 | 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. | ||
| 申请公布号 | US8771816(B2) | 申请公布日期 | 2014.07.08 |
| 申请号 | US201213660777 | 申请日期 | 2012.10.25 |
| 申请人 | Chevron Phillips Chemical Company LP | 发明人 | DesLauriers Paul J.;Inn Yongwoo;Yang Qing;Sukhadia Ashish M.;Rohlfing David C.;Maeger Pamela L. |
| 分类号 | B29C47/00;C08F110/02;F16L9/00;F16L9/12 | 主分类号 | B29C47/00 |
| 代理机构 | Conley Rose, P.C. | 代理人 | Carroll Rodney B.;Huseman Cheryl L.;Conley Rose, P.C. |
| 主权项 | 1. 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. | ||
| 地址 | The Woodlands TX US | ||