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1. 发明授权

US06407191B1 Medium density ethylene polymers, a process to prepare these polymers and use of carbonyl group containing chain transfer agents in this process 有权
标题翻译：中密度乙烯聚合物，在这个过程中制备这些聚合物的方法和使用含羰基的链转移剂
公开(公告)号：US06407191B1
公开(公告)日：2002-06-18
申请号：US09600093
申请日：2000-11-20
申请人： Juan Manuel Mezquita , Karl Zuercher , Ronald Wevers
发明人： Juan Manuel Mezquita , Karl Zuercher , Ronald Wevers
IPC分类号： C08F428
CPC分类号： C08F10/02 , C08F110/02 , C08F2/00 , C08F4/32 , C08F2/38 , C08F2500/08 , C08F2500/12 , C08F2500/26
摘要： The present invention relates to an ethylene homo or copolymer having a density of between 0.923 and 0.935 g/cm3, having a molecular weight distribution Mw/Mn of between 3 and 10, and comprising from 0.10 to 0.50 wt. percent of units derived from a carbonyl group containing compound, based on the total weight of the homo or copolymer. In addition, the invention relates to a free radical initiation polymerization process for the preparation of medium density ethylene polymers or copolymers, comprising reacting ethylene and optionally one or more comonomers at a high pressure, conveniently between 1600 and 4000 kg/cm2, and at temperatures of about 150-330° C. in a reactor system consisting of at least one autoclave reactor or of a combination of autoclave and tubular reactors, in the presence of free radical initiators and a carbonyl group containing compound. Finally, the invention relates to carbonyl group containing chain transfer agents to obtain improved polymer processing and performance properties in flat die extrusion processes and applications.
摘要翻译：本发明涉及密度为0.923至0.935g / cm3的乙烯均聚物或共聚物，其分子量分布Mw / Mn为3-10，并包含0.10至0.50wt。基于含羰基化合物衍生的单元的百分比，基于均聚物或共聚物的总重量。此外，本发明涉及用于制备中等密度乙烯聚合物或共聚物的自由基引发聚合方法，包括使乙烯和任选的一种或多种共聚单体在高压下，方便地在1600至4000kg / cm2之间和在温度在由至少一个高压釜反应器或高压釜和管式反应器的组合组成的反应器系统中，在存在自由基引发剂和含羰基化合物的情况下为约150-330℃。最后，本发明涉及含羰基的链转移剂，以获得改进的聚合物加工和在平模挤出工艺和应用中的性能。

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