发明名称 |
A process for extrusion |
摘要 |
A process for the extrusion of polyethylene having a broad molecular weight distribution wherein the polyethylene is prepared in pellet form, said extrusion taking place in a pelletizing extruder having one or more zones essentially filled with polyethylene and two or more zones partially filled with polyethylene including a feed zone comprising (i) introducing the polyethylene into the extruder at a temperature sufficient to melt the polyethylene; (ii) introducing a mixture of an inert gas and oxygen into at least one partially filled zone with the exception of the feed zone, said mixture containing about 1 to about 21 percent by volume oxygen based on the volume of the gaseous mixture; (iii) passing the molten polyethylene through each zone at melt temperature; and (iv) extruding the polyethylene into pellets and cooling same. |
申请公布号 |
EP0936049(A2) |
申请公布日期 |
1999.08.18 |
申请号 |
EP19980308180 |
申请日期 |
1998.10.08 |
申请人 |
UNION CARBIDE CHEMICALS & PLASTICS TECHNOLOGY CORPORATION |
发明人 |
NEUBAUER, ANTHONY CHARLES |
分类号 |
B29C47/78;B29B9/12;B29C47/00;B29C55/28;B29K23/00;B29L7/00 |
主分类号 |
B29C47/78 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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