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公开(公告)号：US4657948A
公开(公告)日：1987-04-14
申请号：US779140
申请日：1985-09-23
CPC分类号： C09K8/46 , E21B21/003
摘要： A polymer of monoallylamine, preferably a water-soluble polymer of monoallylamine, whether in free (i.e., unneutralized) form or in salt (i.e., partially or completely neutralized) form is used in conjunction with a sulfonated polymer such as a water-soluble lignosulfonate, condensed naphthalene sulfonate, or sulfonated vinyl aromatic polymer, to minimize fluid loss from the slurry during subterranean well cementing operations. The polymer of monoallyl amine may be a homopolymer or a copolymer, and may be crosslinked or uncrosslinked. These components interact with each other in the presence of water to produce a gelatinous material that tends to plug porous zones and minimize premature water loss from the well cement slurry when present in the subterranean well formation. In addition, the gelatinous material so formed prevents de-stabilization of the slurry in the well formation.
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公开(公告)号：US4923954A
公开(公告)日：1990-05-08
申请号：US289028
申请日：1988-12-23
CPC分类号： C08J3/095 , C08G73/1032 , C08G73/1039 , C08J3/14 , C08J2379/08
摘要： Described is a process for producing, in particulate form, aromatic polyimides based on one or more 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropanes. The process involves forming a solution of an equimolar mixture of (1) an aromatic tetracarboxylic dianhydride and (2) a 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane as the sole or predominant aromatic diamine in (3) a solvent composed of (i) tetrahydrofuran, or (ii) one or more alkyltetrahydrofurans having a normal boiling point below 100.degree. C., or (iii) a mixture of (i) and (ii), and heating and agitating such solution in a closed reaction system under super-atmospheric pressure such that a separate phase of particulate aromatic polyimide is formed. The process avoids difficulties caused by the tendency of the wet polyimide polymer to agglomerate into stringy or tacky masses which can foul reactor and agitator surfaces.
摘要翻译： 描述了一种以颗粒形式生产基于一种或多种2,2-双[4-（氨基苯氧基）苯基]六氟丙烷的芳族聚酰亚胺的方法。 该方法包括在（3）溶剂中形成（1）芳族四羧酸二酐和（2）2,2-双[4-（氨基苯氧基）苯基]六氟丙烷作为唯一或主要的芳族二胺的等摩尔混合物的溶液 由（i）四氢呋喃组成，或（ii）一种或多种正常沸点低于100℃的烷基四氢呋喃，或（iii）（i）和（ii）的混合物，并将该溶液加热并搅拌在封闭的 反应体系在超大气压下形成颗粒状芳族聚酰亚胺的分离相。 该方法避免了湿聚酰亚胺聚合物凝聚成可能污染反应器和搅拌器表面的强力或粘性质量的趋势所引起的困难。
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公开(公告)号：US4184924A
公开(公告)日：1980-01-22
申请号：US861309
申请日：1977-12-16
CPC分类号： B01J19/18 , B01J8/20 , C08F6/003 , B01J2219/00121 , B01J2219/00153 , B01J2219/00155 , B01J2219/00162 , B01J2219/00164 , B01J2219/185 , Y10S203/16
摘要： An apparatus for reducing the vinyl chloride monomer content of polyvinyl chloride resins suspended as a slurry in an aqueous medium. The polyvinyl chloride-water slurry as produced in a conventional suspension resin autoclave, or a resin-water slurry prepared subsequent to suspension polymerization, is placed in a vessel and heated to a suitable temperature for removal of vinyl chloride monomer from the resin. In this operation, the polyvinyl chloride-water slurry is agitated in a vessel and steam is injected directly into the slurry to rapidly heat the slurry up to a minimum temperature of at least about 180.degree. F. The slurry is cooled immediately, or optionally it can be maintained for a period of time at the selected maximum temperature and then rapidly cooled by applying vacuum to the vessel and condensing the vapor phase removed from the vessel. Dried polyvinyl chloride resin produced by this process has been found to have a vinyl chloride monomer content below a detectable limit of 0.5 ppm.
摘要翻译： 一种用于降低在水性介质中作为浆料悬浮的聚氯乙烯树脂的氯乙烯单体含量的装置。 在常规悬浮树脂高压釜中制备的聚氯乙烯 - 水浆料或悬浮聚合后制备的树脂 - 水浆料放入容器中并加热到合适的温度以从树脂中除去氯乙烯单体。 在该操作中，将聚氯乙烯 - 水浆料在容器中搅拌并将蒸汽直接注入到浆料中以将浆料快速加热至至少约180°F的最低温度。浆料立即冷却或任选地 可以在所选择的最高温度下保持一段时间，然后通过对容器施加真空并冷凝从容器去除的气相而快速冷却。 已经发现通过该方法生产的干燥聚氯乙烯树脂的氯乙烯单体含量低于可检测限为0.5ppm。
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公开(公告)号：US4086414A
公开(公告)日：1978-04-25
申请号：US649428
申请日：1976-01-15
CPC分类号： B01J19/18 , B01J8/20 , C08F6/003 , B01J2219/00121 , B01J2219/00153 , B01J2219/00155 , B01J2219/00162 , B01J2219/00164 , B01J2219/185
摘要： A method for reducing the vinyl chloride monomer content of polyvinyl chloride resins suspended as a slurry in an aqueous medium. The polyvinyl chloride-water slurry as produced in a conventional suspension resin autoclave, or a resin-water slurry prepared subsequent to suspension polymerization, is placed in a vessel and heated to a suitable temperature for removal of vinyl chloride monomer from the resin. In this operation, the polyvinyl chloride-water slurry is agitated in a vessel and steam is injected directly into the slurry to rapidly heat the slurry up to a minimum temperature of at least about 180.degree. F. The slurry is cooled immediately, or optionally it can be maintained for a period of time at the selected maximum temperature and then rapidly cooled by applying vacuum to the vessel and condensing the vapor phase removed from the vessel. Dried polyvinyl chloride resin produced by this process has been found to have a vinyl chloride monomer content below a detectable limit of 0.5 ppm.
摘要翻译： 一种用于降低在水性介质中作为浆料悬浮的聚氯乙烯树脂的氯乙烯单体含量的方法。 在常规悬浮树脂高压釜中制备的聚氯乙烯 - 水浆料或悬浮聚合后制备的树脂 - 水浆料放入容器中并加热到合适的温度以从树脂中除去氯乙烯单体。 在该操作中，将聚氯乙烯 - 水浆料在容器中搅拌并将蒸汽直接注入到浆料中以将浆料快速加热至至少约180°F的最低温度。浆料立即冷却或任选地 可以在所选择的最高温度下保持一段时间，然后通过对容器施加真空并冷凝从容器去除的气相而快速冷却。 已经发现通过该方法生产的干燥聚氯乙烯树脂的氯乙烯单体含量低于可检测限为0.5ppm。
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公开(公告)号：US5039776A
公开(公告)日：1991-08-13
申请号：US523349
申请日：1990-05-14
申请人： Hsueh M. Li , Adam Nugent, Jr.
发明人： Hsueh M. Li , Adam Nugent, Jr.
摘要： Fusible polyimide powders are prepared by the process of this invention. An amic acid amine is first prepared by treating equimolar amounts of a 2,2-bis[4-(aminophenoxy)phenyl]-hexafluoropropane with an unsaturated carbocyclic monoanhydride. The amic acid amine is then mixed with an aromatic tetracarboxylic dianhydride and the mixture heated to form a polyimide precursor. A chemical dehydrating agent is added in an amount sufficient to substantially, fully imidize the precursor. The resulting fusible polyimide powder is finally separated.
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公开(公告)号：US4706755A
公开(公告)日：1987-11-17
申请号：US32635
申请日：1987-04-01
CPC分类号： C04B28/02 , C09K8/487 , C04B2103/46
摘要： A polymer of monoallylamine, preferably a water-soluble polymer of monoallylamine, whether in free (i.e., unneutralized) form or in salt (i.e., partially or completely neutralized) form is used in conjunction with a sulfonated polymer such as a water-soluble lignosulfonate, condensed naphthalene sulfonate, or sulfonated vinyl aromatic polymer, to minimize fluid loss from the slurry during subterranean well cementing operations. The polymer of monoallyl amine may be a homopolymer or a copolymer, and may be crosslinked or uncrosslinked. These components interact with each other in the presence of water to produce a gelatinous material that tends to plug porous zones and minimize premature water loss from the well cement slurry when present in the subterranean well formation. In addition, the gelatinous material so formed prevents de-stabilization of the slurry in the well formation.
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公开(公告)号：US4698380A
公开(公告)日：1987-10-06
申请号：US945432
申请日：1986-12-22
CPC分类号： C09K8/46 , E21B21/003
摘要： A polymer of monoallylamine, preferably a water-soluble polymer of monoallylamine, whether in free (i.e., unneutralized) form or in salt (i.e., partially or completely neutralized) form is used in conjunction with a sulfonated polymer such as a water-soluble lignosulfonate, condensed naphthalene sulfonate, or sulfonated vinyl aromatic polymer, to minimize fluid loss from the slurry during subterranean well cementing operations. The polymer of monoallyl amine may be a homopolymer or a copolymer, and may be crosslinked or uncrosslinked. These components interact with each other in the presence of water to produce a gelatinous material that tends to plug porous zones and minimize premature water loss from the well cement slurry when present in the subterranean well formation. In addition, the gelatinous material so formed prevents de-stabilization of the slurry in the well formation.
摘要翻译： 单烯丙基胺，优选单烯丙胺的水溶性聚合物，无论是游离（即未中和）形式或盐（即部分或完全中和）形式的聚合物与磺化聚合物如水溶性木质素磺酸盐联合使用 ，缩合萘磺酸盐或磺化乙烯基芳族聚合物，以在地下井固井操作期间使来自浆料的流体损失最小化。 单烯丙基胺的聚合物可以是均聚物或共聚物，并且可以是交联的或未交联的。 这些组分在水的存在下相互作用以产生凝胶状材料，其倾向于堵塞多孔区，并且当存在于地下井中时最小化井水泥浆中的过早失水。 此外，如此形成的凝胶状材料防止了井结构中的浆料的不稳定。
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公开(公告)号：US4104459A
公开(公告)日：1978-08-01
申请号：US670239
申请日：1976-03-25
CPC分类号： C08F6/001
摘要： A method for reducing the vinyl chloride monomer content of polyvinyl chloride resins. The polyvinyl chloride-water slurry is placed in a vessel, and heat is applied to the vessel for a sufficient time to raise it to a suitable temperature for removal of vinyl chloride monomer from the resin. The resin slurry is agitated and also subjected to a vacuum to reduce the temperature during the heat stripping step. In a preferred method, the polvinyl chloride-water slurry is agitated in a closed vessel, heat is applied to rapidly heat the slurry to a temperature of at least about 50.degree. C, and vacuum is applied to the vessel. The slurry is then rapidly cooled by suitable means. The slurry is then dewatered and dried. Dried polyvinyl chloride resins produced by this process have been found to have a vinyl chloride monomer content below a detectable limit of about 2.0 ppm.
摘要翻译： 降低聚氯乙烯树脂的氯乙烯单体含量的方法。 将聚氯乙烯 - 水浆料放置在容器中，并将热量施加到容器上足够的时间以将其升高至用于从树脂中除去氯乙烯单体的合适温度。 搅拌树脂浆料并且还进行真空以降低热解步骤期间的温度。 在优选的方法中，将聚氯乙烯 - 水浆料在密闭容器中搅拌，施加热量以将浆料快速加热至至少约50℃的温度，并将真空加到容器上。 然后通过合适的方式快速冷却浆料。 然后将浆液脱水并干燥。 已发现通过该方法生产的干燥聚氯乙烯树脂的氯乙烯单体含量低于约2.0ppm的可检测限。
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