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1. 发明授权

US5034364A Multiple chromium compound-containing catalyst composition and olefin polymerization therewith 失效
标题翻译：多种含铬化合物的催化剂组合物和烯烃聚合反应
公开(公告)号：US5034364A
公开(公告)日：1991-07-23
申请号：US438814
申请日：1989-11-09
申请人： Bohumil V. Kral , Grace O. Tsien , Chisung Wu
发明人： Bohumil V. Kral , Grace O. Tsien , Chisung Wu
IPC分类号： B01J23/26 , C08F4/24 , C08F10/00
CPC分类号： C08F10/00 , B01J23/26 , C08F2410/04
摘要： An olefin, particularly alpha-olefin, polymerization catalyst composition, supported on a refractory oxide support comprises two chromium specie: (1) CrO.sub.3 or any chromium compound calcinable to CrO.sub.3 ; and (2) at least one silylchromate compound. The composition is prepared by sequentially depositing specie (1) and (2) onto the same support.
摘要翻译：负载在耐火氧化物载体上的烯烃，特别是α-烯烃聚合催化剂组合物包括两种铬：（1）CrO 3或可煅烧成CrO 3的任何铬化合物; 和（2）至少一种甲硅烷基铬酸盐化合物。通过将样品（1）和（2）顺序沉积到相同的载体上来制备组合物。

2. 发明授权

US5102955A Broad distribution, high molecular weight low density polyethylene and method of making thereof 失效
标题翻译：宽分布，高分子量低密度聚乙烯及其制备方法
公开(公告)号：US5102955A
公开(公告)日：1992-04-07
申请号：US458855
申请日：1989-12-29
申请人： David C. Calabro , Pamela J. Cook , Bohumil V. Kral
发明人： David C. Calabro , Pamela J. Cook , Bohumil V. Kral
IPC分类号： C08F10/02 , C08F8/00 , C08F297/06 , C08L23/06 , C08L23/08
CPC分类号： C08F297/06 , C08L23/0815 , C08L2205/02 , C08L23/06
摘要： There is disclosed a low density polymer having a broad molecular weight distribution, such that its melt flow ratio (MFR) is about 50 to about 250, and a substantially constant melt index-corrected density. The polymer, produced e.g., by blending a first polymer component of high molecular weight with a second polymer component of low molecular weight, with both polymer components having substantially the same melt index-corrected density, produces films having improved strength properties and low hexane extractables, as compared to films made from comparable individual polymer components.There is also disclosed a low density polymer, also having MFR of about 50 to about 250, having substantially no polymer chains having low molecular weight and short chain branches, which is prepared by blending a first polymer component of low density and high molecular weight with a second polymer component of relatively high density and relatively low molecular weight. The melt index-corrected densities of these two polymer components are dissimilar.

3. 发明授权

US06423791B1 Process for the production of linear low density ethylene copolymers 失效
标题翻译：生产线性低密度乙烯共聚物的方法
公开(公告)号：US06423791B1
公开(公告)日：2002-07-23
申请号：US08738920
申请日：1996-10-28
申请人： Bohumil V. Kral
发明人： Bohumil V. Kral
IPC分类号： C08F200
CPC分类号： C08F210/16 , C08F2/00 , C08F210/14
摘要： A process is provided for producing an essentially linear copolymer of ethylene and a minor amount of a 1-olefin containing more than 2 carbon atoms comprising contacting said ethylene and 1-olefin with a Ziegler catalyst in a polymerization reaction zone at elevated temperature and pressure, contacting the polymerization reaction mixture containing polymer and unreacted monomers with a fresh supply of ethylene in a high pressure separation zone (HPS) operating at a lower pressure than the reaction zone such that the contents of the separation zone separates into a dense phase containing a major proportion of polymer, and a light phase containing a major proportion of unreacted monomers, and separately withdrawing the two phases from the separation zone. The polymer containing dense phase is then subsequently treated to obtain a purified polymer product, and at least a portion of the unreacted monomers in the light phase is generally re-used in the reaction, with or without some intermediate treatment or purification.
摘要翻译：提供了一种制备乙烯和少量含有多于2个碳原子的1-烯烃的基本上线性的共聚物的方法，包括在高温和高压下在聚合反应区中使齐格勒催化剂与乙烯和1-烯烃接触，使含有聚合物和未反应单体的聚合反应混合物与新鲜供应的乙烯在高于反应区的压力下操作的高压分离区（HPS）中接触，使得分离区的内容物分离成含有主要的密相聚合物的比例和含有主要比例的未反应单体的轻相，并且从分离区分别取出两相。然后随后处理含有致密相的聚合物以获得纯化的聚合物产物，并且在反应中通常将至少一部分未反应的轻质单体重新用于反应中，或者进行一些中间处理或纯化。

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