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公开(公告)号：US3900457A
公开(公告)日：1975-08-19
申请号：US7931670
申请日：1970-10-08
发明人： WITT DONALD R
CPC分类号： C01B33/16 , C01B33/154 , C08F10/00 , C08F4/22
摘要： A method for preparing silica-containing olefin polymerization catalysts, and the process performable therewith, the preparation involving adding an alkali metal silicate to an acid under defined conditions of addition to produce a hydrogel, recovering the gel in the substantially dry condition by employment of an oxygenated organic compound and impregnating the gel with a chromium compound.
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公开(公告)号：US3875079A
公开(公告)日：1975-04-01
申请号：US27637372
申请日：1972-07-31
发明人： WITT DONALD R
CPC分类号： B01J23/04 , C08F10/00 , Y10S502/513 , C08F4/22
摘要： Olefin polymerization catalysts, formed of a silica produced employing lithium silicate, produce ethylene polymers of higher melt index than are obtained when sodium silicate is employed.
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公开(公告)号：US3622521A
公开(公告)日：1971-11-23
申请号：US3622521D
申请日：1967-08-21
发明人： HOGAN JOHN P , WITT DONALD R
摘要： Catalyst formed by first adding to a support a chromiumcontaining compound using an aqueous medium and then adding a titanium-containing compound using a nonaqueous medium.
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4.发明授权Process for the production of 1-olefin polymers having increased melt index 失效生产具有增加的熔融指数的1-烯烃聚合物的方法
公开(公告)号：US3562241A
公开(公告)日：1971-02-09
申请号：US3562241D
申请日：1965-11-15
发明人： WITT DONALD R
CPC分类号： C08F10/00 , Y10S526/905 , C08F4/22
摘要： PRETREATMENT OF A CHROMIUM OXIDE POLYMERIZATION CATALYST WITH A 4-10 CARBON ATOM-CONTAINING BRANCHED CHAIN ALIPHATIC OLEFIN PRIOR TO THE UTILIZATION OF THE CATALYST FOR THE PREPARATION OF A 1-OLEFIN POLYMER AND THEREAFTER CARRYING OUT THE 1-OLEFIN POLYMERIZATION IN A LIQUID BRANCHED CHAIN PARAFFIN REACTION MEDIUM AND IN THE PRESENCE OF HYDROGEN RESULTS IN THE PRODUCTION OF HIGHER MELT INDEX 1-OLEFIN POLYMERS.
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公开(公告)号：US3541072A
公开(公告)日：1970-11-17
申请号：US3541072D
申请日：1968-02-08
发明人： WITT DONALD R , HOGAN JOHN P
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公开(公告)号：US3378540A
公开(公告)日：1968-04-16
申请号：US37007264
申请日：1964-05-25
发明人： WITT DONALD R
IPC分类号： C08F10/00
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公开(公告)号：US3372140A
公开(公告)日：1968-03-05
申请号：US48706065
申请日：1965-09-13
发明人： WITT DONALD R
IPC分类号： C08K5/55
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8.发明授权Polymerization of conjugated diolefins in the presence of transition metal borohydrides 失效在过渡金属硼氢化物存在下共轭二烯烃的聚合
公开(公告)号：US3082197A
公开(公告)日：1963-03-19
申请号：US77722658
申请日：1958-12-01
发明人： WITT DONALD R
IPC分类号： C08F36/04
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9.发明授权Preparation of a supported chromium oxide-dicarboxylic acid catalyst and polymerization of olefins thereby 失效负载型氧化铬 - 二羧酸催化剂的制备和烯烃的聚合
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公开(公告)号：US2980659A
公开(公告)日：1961-04-18
申请号：US70834958
申请日：1958-01-13
发明人： WITT DONALD R
IPC分类号： C08F10/00
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