-
公开(公告)号：US20040186250A1
公开(公告)日：2004-09-23
申请号：US10788631
申请日：2004-02-27
发明人： Michael Allen Kinnan , Fred David Ehrman , Pradeep Pandurang Shirodkar , Mark Bradley Davis , Michele Lynn Grief-Rust
IPC分类号： C08F002/38
CPC分类号： C08F10/00 , C08F4/65912 , C08F4/65916 , C08F4/65925 , C08F210/16 , C08F2410/05 , C08F4/65904 , C08F2/42 , C08F4/69 , C08F210/14 , C08F2500/12 , C08F2500/18 , C08F2500/24 , C08F4/6546
摘要： A method of transitioning catalysts for polyolefin polymerization is provided. In one aspect, the process includes providing a polymerization reactor that includes a first catalyst system, contacting olefin monomers with the first catalyst system to form polyolefin in a first polymerization reaction and introducing a catalyst killer to the polymerization reactor in an amount sufficient to terminate the first polymerization reaction. The method further includes introducing a second catalyst system to the polymerization reactor in the presence of at least a portion of the catalyst killer, wherein the at least a portion of the catalyst killer is an amount sufficient to activate the second catalyst system and contacting olefin monomers with the second catalyst system to form polyolefin in a second polymerization reaction.
-
82.发明申请Processes for transitioning between chrome-based and mixed polymerization catalysts 有权铬基和混合聚合催化剂之间过渡的方法公开(公告)号：US20040143076A1
公开(公告)日：2004-07-22
申请号：US10715651
申请日：2003-11-17
发明人： Kersten Anne Terry , Mark Gregory Goode , Daniel E. Wente , John Chirillo , Simon Mawson , Jose Fernando Cevallos-Candau
IPC分类号： C08F002/00
CPC分类号： C08F210/16 , C08F4/65912 , C08F4/65925 , C08F10/00 , C08F2410/05 , Y10S526/901 , C08F4/22 , C08F2/34 , C08F2/001 , C08F2/42 , C08F210/14 , C08F2500/18
摘要： Processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, processes for transitioning among olefin polymerization reactions utilizing silyl-chromate catalyst systems and metallocene catalyst systems.
摘要翻译： 用于在聚合催化剂体系之间过渡的方法，优选彼此不相容的催化剂体系。 特别地，使用甲硅烷基 - 铬酸盐催化剂体系和茂金属催化剂体系在烯烃聚合反应中过渡的方法。
-
83.发明授权Methods for forming amorphous ultra-high molecular weight polyolefins and drag reducing compositions comprising amorphous ultra-high molecular weight polyolefins 有权用于形成无定形超高分子量聚烯烃和包含无定形超高分子量聚烯烃的减阻组合物的方法公开(公告)号：US06730752B2
公开(公告)日：2004-05-04
申请号：US09760544
申请日：2001-01-16
IPC分类号： C08F442
CPC分类号： C10M143/08 , C08F10/00 , C08F110/00 , C08F210/00 , C09K3/00 , C10L1/1641 , C10L1/165 , C10L1/1658 , C10M107/10 , F17D1/16 , C08F2/42 , C08F4/6493 , C08F2/002 , C08F4/6428 , C08F2/08 , C08F2/005 , C08F2500/12
摘要： A composition including polyalphaolefins that function as drag reducing agents and a process for the preparation of polyalphaolefins that function as drag reducing agents are disclosed. The process includes contacting alpha olefin monomers with a catalyst system, which includes a catalyst and an activator (co-catalyst) in a reactant mixture. The catalyst is a transition metal catalyst, preferably titanium trichloride, and the co-catalyst may include an alkylaluminoxane, alone or in combination, with a dialkylaluminum halide or a halohydrocarbon. The polymerization of the alpha olefin monomers produces a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of at least 10 dL/g. The addition of the alkylaluminoxane during the polymerization process provides for a non-crystalline, ultra-high molecular weight polyalphaolefin and a more uniform molecular weight distribution of the resulting polyalphaolefin, thereby creating a drag reducing agent superior to known drag reducing agents. A process for forming a drag reducing agent comprising a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of about at least 10 dL/g and a process for reducing drag in a conduit are also disclosed.
摘要翻译： 公开了包含用作减阻剂的聚α-烯烃的组合物和用作制备用作减阻剂的聚α-烯烃的方法。 该方法包括使α-烯烃单体与催化剂体系接触，催化剂体系包括反应物混合物中的催化剂和活化剂（助催化剂）。 催化剂是过渡金属催化剂，优选三氯化钛，并且助催化剂可以单独或与二烷基卤化铝或卤代烃单独或组合地使用烷基铝氧烷。 α-烯烃单体的聚合产生具有至少10dL / g的特性粘度的非结晶超高分子量聚α-烯烃。 在聚合过程中加入烷基铝氧烷提供非结晶，超高分子量聚α-烯烃和所得聚α-烯烃的更均匀的分子量分布，从而产生优于已知减阻剂的减阻剂。 还公开了一种形成减阻剂的方法，其包含特性粘度为约10dL / g的非结晶，超高分子量聚α-烯烃和减少管道中的阻力的方法。
-
84.发明授权Nitrosamine-inhibiting compositions for shortstopping of free radical emulsion polymerizations 失效用于缓冲自由基乳液聚合的亚硝胺抑制组合物公开(公告)号：US06495065B1
公开(公告)日：2002-12-17
申请号：US09631756
申请日：2000-08-03
IPC分类号： C09K300
CPC分类号： C08F2/42 , C08F2/22 , C08F236/04
摘要： The present invention is a composition for and a method of shortstopping free radical emulsion polymerizations that inhibits the formation of nitrosamines. The composition comprised nitrosamine inhibitors in combination with conventional alkylhydroxylamine shortstoppers. Such nitrosamine inhibitors are based on primary amines, amine-containing polymers, pyrroles, hydroquinones, certain phenols, ascorbic acid, and other well-known nitrosation inhibitors; they may be used individually or as a blend. The compositions are targeted for applications in the emulsion processes for producing rubber latexes and the preparation of rubber products thereafter.
摘要翻译： 本发明是用于抑制自由基乳液聚合的抑制亚硝胺形成的组合物和方法。 组合物与常规的烷基羟胺快速反应器组合包含亚硝胺抑制剂。 这样的亚硝胺抑制剂基于伯胺，含胺聚合物，吡咯，氢醌，某些酚，抗坏血酸和其他众所周知的亚硝化抑制剂; 它们可以单独使用或作为混合物使用。 该组合物的目标是在用于生产橡胶胶乳的乳液方法中的应用和其后的橡胶产品的制备。
-
公开(公告)号：US06262195B1
公开(公告)日：2001-07-17
申请号：US09265036
申请日：1999-03-09
IPC分类号： C08F442
CPC分类号： C08F10/00 , C08F4/65912 , C08F210/16 , C08F2410/05 , C08L23/0815 , C08L2308/00 , Y10S526/943 , C08F2/42 , C08F4/65927 , C08F2/001 , C08L2666/04 , C08F210/06 , C08F2500/17 , C08F2500/04 , C08F2500/01
摘要： A multi-stage process for preparing ethylene (co)polymers having broad molecular weight distributions is disclosed, said process comprising: (A) a first polymerization stage in which, in the presence of a Ti or V catalyst, a first ethylene polymer is prepared; (B) a treatment stage in which the catalyst used in the first stage is deactivated and in which a bridged bis-2-indenyl zirconocene is supported on the ethylene polymer produced in stage (A), optionally in the presence of a suitable cocatalyst; and (C) a second polymerization stage in which ethylene is polymerized in the presence of the product obtained from stage (B). Furthermore, polyethylene obtainable by the above process is disclosed, having intrinsic viscosity ranging from 0.5 to 6 dl/g, Mw/Mn>8 and cold xylene solubility
摘要翻译： 公开了一种用于制备具有宽分子量分布的乙烯（共））聚合物的多阶段方法，所述方法包括：（A）在Ti或V催化剂存在下制备第一乙烯聚合物的第一聚合阶段 ;（B）在第一阶段中使用的催化剂失活并且桥接的双-2-茚基二茂锆负载在阶段（A）中制备的乙烯聚合物上，任选地在合适的助催化剂存在下的处理阶段 ; 和（C）第二聚合阶段，其中乙烯在从阶段（B）获得的产物存在下聚合。此外，公开了通过上述方法获得的聚乙烯，其特性粘度范围为0.5至6dl / g，Mw / Mn> 8，冷二甲苯溶解度<1.2％
-
86.发明申请Methods for forming amorphous ultra-high molecular weight polyolefins and drag reducing compositions comprising amorphous ultra-high molecular weight polyolefins 有权用于形成无定形超高分子量聚烯烃和包含无定形超高分子量聚烯烃的减阻组合物的方法公开(公告)号：US20010002389A1
公开(公告)日：2001-05-31
申请号：US09760544
申请日：2001-01-16
IPC分类号： C10M143/00 , C08F004/44
CPC分类号： C10M143/08 , C08F10/00 , C08F110/00 , C08F210/00 , C09K3/00 , C10L1/1641 , C10L1/165 , C10L1/1658 , C10M107/10 , F17D1/16 , C08F2/42 , C08F4/6493 , C08F2/002 , C08F4/6428 , C08F2/08 , C08F2/005 , C08F2500/12
摘要： A composition including polyalphaolefins that function as drag reducing agents and a process for the preparation of polyalphaolefins that function as drag reducing agents are disclosed. The process includes contacting alpha olefin monomers with a catalyst system. which includes a catalyst and an activator (co-catalyst) in a reactant mixture. The catalyst is a transition metal catalyst, preferably titanium trichloride, and the co-catalyst may include an alkylaluminoxane, alone or in combination, with a dialkylaluminum halide or a halohydrocarbon. The polymerization of the alpha olefin monomers produces a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of at least 10 dL/g. The addition of the alkylaluminoxane during the polymerization process provides for a non-crystalline, ultra-high molecular weight polyalphaolefin and a more uniform molecular weight distribution of the resulting polyalphaolefin, thereby creating a drag reducing agent superior to known drag reducing agents. A process for forming a drag reducing agent comprising a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of about at least 10 dL/g and a process for reducing drag in a conduit are also disclosed.
摘要翻译： 公开了包含用作减阻剂的聚α-烯烃的组合物和用作制备用作减阻剂的聚α-烯烃的方法。 该方法包括使α烯烃单体与催化剂体系接触。 其包括反应物混合物中的催化剂和活化剂（助催化剂）。 催化剂是过渡金属催化剂，优选三氯化钛，并且助催化剂可以单独或与二烷基卤化铝或卤代烃单独或组合地使用烷基铝氧烷。 α-烯烃单体的聚合产生具有至少10dL / g的特性粘度的非结晶超高分子量聚α-烯烃。 在聚合过程中加入烷基铝氧烷提供非结晶，超高分子量聚α-烯烃和所得聚α-烯烃的更均匀的分子量分布，从而产生优于已知减阻剂的减阻剂。 还公开了一种形成减阻剂的方法，其包含特性粘度为约10dL / g的非结晶，超高分子量聚α-烯烃和减少管道中的阻力的方法。
-
87.发明授权Methods for forming amorphous ultra-high molecular weight polyalphaolefin drag reducing agents using a halohydrocarbon 有权使用卤代烃形成无定形超高分子量聚α-烯烃减阻剂的方法
公开(公告)号：US6162773A
公开(公告)日：2000-12-19
申请号：US396247
申请日：1999-09-15
IPC分类号： C08F210/14 , C08F2/00 , C08F2/08 , C08F2/42 , C08F2/44 , C08F4/44 , C08F4/642 , C08F4/649 , C08F10/00 , C08F110/00 , C08F210/00 , C08F210/16 , C08L23/00 , C09K3/00 , C10L1/16 , C10M107/10 , C10M143/08 , F17D1/16 , C10M143/00
CPC分类号： C10M143/08 , C08F10/00 , C08F110/00 , C08F210/00 , C09K3/00 , C10L1/1641 , C10L1/165 , C10L1/1658 , C10M107/10 , F17D1/16 , C08F2/42 , C08F4/6493 , C08F2/002 , C08F4/6428 , C08F2/08 , C08F2/005 , C08F2500/12
摘要： A composition including polyalphaolefins that function as drag reducing agents and a process for the preparation of polyalphaolefins that function as drag reducing agents are disclosed. The process includes contacting alpha olefin monomers with a catalyst system, which includes a catalyst and an activator (co-catalyst) in a reactant mixture. The catalyst is a transition metal catalyst, preferably titanium trichloride, and the co-catalyst may include an alkylaluminoxane, alone or in combination, with a dialkylaluminum halide or a halohydrocarbon. The polymerization of the alpha olefin monomers produces a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of at least 10 dL/g. The addition of the alkylaluminoxane during the polymerization process provides for a non-crystalline, ultra-high molecular weight polyalphaolefin and a more uniform molecular weight distribution of the resulting polyalphaolefin, thereby creating a drag reducing agent superior to known drag reducing agents. A process for forming a drag reducing agent comprising a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of about at least 10 dL/g and a process for reducing drag in a conduit are also disclosed.
摘要翻译： 公开了包含用作减阻剂的聚α-烯烃的组合物和用作制备用作减阻剂的聚α-烯烃的方法。 该方法包括使α-烯烃单体与催化剂体系接触，催化剂体系包括反应物混合物中的催化剂和活化剂（助催化剂）。 催化剂是过渡金属催化剂，优选三氯化钛，并且助催化剂可以单独或与二烷基卤化铝或卤代烃单独或组合地使用烷基铝氧烷。 α-烯烃单体的聚合产生具有至少10dL / g的特性粘度的非结晶超高分子量聚α-烯烃。 在聚合过程中加入烷基铝氧烷提供非结晶，超高分子量聚α-烯烃和所得聚α-烯烃的更均匀的分子量分布，从而产生优于已知减阻剂的减阻剂。 还公开了一种形成减阻剂的方法，其包含特性粘度为约10dL / g的非结晶，超高分子量聚α-烯烃和减少管道中的阻力的方法。
-
公开(公告)号：US5384372A
公开(公告)日：1995-01-24
申请号：US220328
申请日：1994-03-30
申请人： Richard R. Lattime
发明人： Richard R. Lattime
CPC分类号： C08F2/42
摘要： The present invention relates to a method of terminating a free radical initiated emulsion polymerization by using a shortstopping agent selected from the group consisting of isopropylhydroxylamine and salts thereof. One advantage in using these shortstopping agents is these shortstopping agents do not contribute to the generation of volatile nitrosamines.
摘要翻译： 本发明涉及通过使用选自异丙基羟胺及其盐的速效剂终止自由基引发的乳液聚合的方法。 使用这些速效剂的一个优点是这些速效剂对挥发性亚硝胺的产生没有贡献。
-
公开(公告)号：US5177164A
公开(公告)日：1993-01-05
申请号：US723318
申请日：1991-06-28
摘要： A process for shortstopping a free radical polymerization of a conjugated diene and optionally a vinyl-substituted aromatic in an aqueous emulsion, using a hydroperoxide as initiator and a redox activator, comprising a divalent transition metal, a reducing agent and optionally being carried out in the presence of a modifier, and being performed by using as sole shortstopping agent an alkali metal polysulphide. This process results in the production of polymeric products which are free of carcinogenic nitrosamines.
摘要翻译： 使用氢过氧化物作为引发剂和氧化还原活化剂，在水性乳液中速断共轭二烯和任选的乙烯基取代的芳族化合物的自由基聚合的方法，其包含二价过渡金属，还原剂，任选地在 改性剂的存在，并且通过使用碱金属多硫化物作为唯一的止动剂来进行。 该过程导致生产不含致癌亚硝胺的聚合物产品。
-
公开(公告)号：US4965326A
公开(公告)日：1990-10-23
申请号：US410460
申请日：1989-09-21
申请人： Gerhard Horpel , Joachim Pangratz
发明人： Gerhard Horpel , Joachim Pangratz
IPC分类号： C08F2/38 , C08F2/42 , C08F36/04 , C08F236/10
摘要： Process for inhibiting and for stopping radical induced polymerizations which employs an aromatic hydroxy dithiocarboxylic acid or salt thereof as stopping agent for deactivating radicals, thereby precluding the formation of carcinogenic nitrosamines.
摘要翻译： 用于抑制和停止自由基诱导聚合的方法，其使用芳族羟基二硫代羧酸或其盐作为使自由基失活的停止剂，从而排除致癌亚硝胺的形成。
-
-
-
-
-
-
-
-
-
搜索结果
295 条记录 (耗时 0.027 秒)
