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公开(公告)号：US20090200153A1
公开(公告)日：2009-08-13
申请号：US11665047
申请日：2005-10-06
IPC分类号： B01D61/36
CPC分类号： B01D61/362 , B01D53/22 , C07D317/12
摘要： Processes are described which comprise: (a) providing a mixture comprising a cyclic formal and water, wherein the mixture has a cyclic formal concentration and a water concentration; (b) bringing the mixture into contact with an aqueously selective membrane; (c) creating a pressure differential across the membrane; and (d) obtaining a permeate having a higher water concentration and a lower cyclic formal concentration than the mixture, and a retentate having a lower water concentration and a higher cyclic formal concentration than the mixture.
摘要翻译： 描述了方法，其包括：（a）提供包含环状缩甲醛和水的混合物，其中所述混合物具有环形形式浓度和水浓度; （b）使混合物与高选择性的膜接触; （c）跨过膜产生压力差; 和（d）获得具有比混合物更高的水浓度和较低的环状甲醛浓度的渗透物，以及具有比混合物低的水浓度和较高的环状甲醛浓度的滞留物。
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公开(公告)号：US08993709B2
公开(公告)日：2015-03-31
申请号：US13546288
申请日：2012-07-11
CPC分类号： C08G2/00
摘要： The present invention relates to a process for the preparation of oxymethylene polymers, the oxymethylene polymers obtained therefrom as well as their use.
摘要翻译： 本发明涉及一种制备甲醛聚合物的方法，由其获得的甲醛聚合物及其用途。
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公开(公告)号：US08481671B2
公开(公告)日：2013-07-09
申请号：US12787698
申请日：2010-05-26
CPC分类号： C08L67/025 , C08G2/06 , C08G2/10 , C08L59/02 , C08L2666/16
摘要： The present invention relates to a process for the preparation of oxymethylene polymers as well as oxymethylene polymers obtainable therefrom. The process includes polymerization of a monomer, which forms —CH2—O— units in the presence of an acetal of formaldehyde or a polyhydric alcohol and an initiator for cationic polymerization. The initiator may be a heteropoly acid or an acid salt thereof which is dissolved in an alkyl ester of a polybasic carboxylic acid.
摘要翻译： 本发明涉及一种制备甲醛聚合物的方法以及由其获得的甲醛聚合物。 该方法包括在甲醛或多元醇的缩醛和用于阳离子聚合的引发剂的存在下形成-CH 2 -O-单体的单体的聚合。 引发剂可以是杂多酸或其酸盐，其溶解在多元羧酸的烷基酯中。
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公开(公告)号：US20130018170A1
公开(公告)日：2013-01-17
申请号：US13546288
申请日：2012-07-11
IPC分类号： C08G65/16
CPC分类号： C08G2/00
摘要： The present invention relates to a process for the preparation of oxymethylene polymers, the oxymethylene polymers obtained therefrom as well as their use.
摘要翻译： 本发明涉及一种制备甲醛聚合物的方法，由其获得的甲醛聚合物及其用途。
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15.发明授权Process for preparation of oxymethylene polymers in a homogeneous phase, and use 失效在均相中制备甲醛聚合物的方法，并使用公开(公告)号：US07943726B2
公开(公告)日：2011-05-17
申请号：US11643223
申请日：2006-12-21
IPC分类号： C08G59/00
摘要： A process and an apparatus are described for preparation of oxymethylene polymers. This process encompasses polymerization, in a homogeneous phase, of a monomer which forms oxymethylene groups, as far as 90% of maximum conversion in the presence of an acetal of formaldehyde and of an initiator for cationic polymerization, followed by deactivation of the reaction mixture. The resultant oxymethylene polymers have alkyl ether end groups and are extremely stable.
摘要翻译： 描述了制备甲醛聚合物的方法和装置。 该方法包括在均相中聚合形成甲醛基的单体，在甲醛缩醛和阳离子聚合引发剂的存在下，最大转化率为90％，随后反应混合物失活。 所得的甲醛聚合物具有烷基醚端基并且非常稳定。
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公开(公告)号：US07902324B2
公开(公告)日：2011-03-08
申请号：US11861832
申请日：2007-09-26
摘要： An initiator for cationic polymerization comprises a salt of a protic acid as well as a protic acid. The molar ratio of protic acid to salt is in the range from 1:0.01 to 1:2000. The initiator is used for example for cationic homo- or copolymerization of trioxane, and permits stable and flexible operation of the polymerization.
摘要翻译： 阳离子聚合引发剂包括质子酸和质子酸的盐。 质子酸与盐的摩尔比在1:0.01至1:2000的范围内。 引发剂用于例如三恶烷的阳离子均聚或共聚，并且允许聚合的稳定和灵活的操作。
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17.发明申请Oxymethylene Copolymers and the Use Thereof and Process for the Preparation of Oxymethylene Copolymers 失效亚甲基共聚物及其用途和制备亚甲基共聚物的方法公开(公告)号：US20090270572A1
公开(公告)日：2009-10-29
申请号：US12423625
申请日：2009-04-14
摘要： Oxymethylene copolymers having a high proportion of terminal alkyl ether groups and having terminal hydroxyalkylene groups are described. These polymers are distinguished by high thermal stability and high hot water resistance.Furthermore, a process for the preparation of oxymethylene copolymers is described in which the polymerization of at least one monomer forming —CH2—O— units is effected in the presence of at least one acetal of formaldehyde and of at least one initiator of cationic polymerization and the initiator of cationic polymerization is used in an amount of less than or equal to 10−4 mol %, based on the amount of the monomers present at the beginning of the polymerization and forming —CH2—O— units, in which starting materials of the polymerization are used such that the content of water and formic acid at the beginning of the polymerization is less than or equal to 40 ppm, and in which the initiator and/or the active polymer chains are deactivated by treatment of the prepared polymer with a base-containing protic solvent.
摘要翻译： 描述了具有高比例的末端烷基醚基团并具有末端羟基亚烷基的甲醛共聚物。 这些聚合物的特征在于高热稳定性和高耐热水性。 此外，描述了制备甲醛共聚物的方法，其中形成-CH 2 -O-单元的至少一种单体的聚合在至少一种甲醛缩醛和至少一种阳离子聚合引发剂的存在下进行，并且 基于聚合开始时存在的单体的量和形成-CH 2 -O-单元，阳离子聚合引发剂的用量小于或等于10-4mol％，其中起始原料为 使用聚合，使得聚合开始时的水和甲酸的含量小于或等于40ppm，并且其中引发剂和/或活性聚合物链通过用制备的聚合物处理而失活 含碱性质子溶剂。
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公开(公告)号：US20120259089A1
公开(公告)日：2012-10-11
申请号：US13527356
申请日：2012-06-19
IPC分类号： C08G65/16
摘要： An initiator for cationic polymerization comprises a salt of a protic acid as well as a protic add. The molar ratio of protic acid to salt is in the range from 1:0.01 to 1:2000. The initiator is used for example for cationic homo- or copolymerization of trioxane, and permits stable and flexible operation of the polymerization.
摘要翻译： 阳离子聚合引发剂包括质子酸和质子酸的盐。 质子酸与盐的摩尔比在1:0.01至1:2000的范围内。 引发剂用于例如三恶烷的阳离子均聚或共聚，并且允许聚合的稳定和灵活的操作。
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19.发明申请公开(公告)号：US20120232246A1
公开(公告)日：2012-09-13
申请号：US13482158
申请日：2012-05-29
IPC分类号： C08G65/06
摘要： Oxymethylene polymers having a bimodal distribution or having a distribution of higher modality and having a targeted content of a low molecular weight fraction of from 1 to 5 percent by mass are described. Moldings of these polymers are distinguished by high low-temperature notched impact strength associated with a high modulus of elasticity.
摘要翻译： 描述具有双峰分布或具有较高模态分布并且具有1至5质量％的低分子量分数的目标含量的甲醛聚合物。 这些聚合物的模制品通过与高弹性模量相关的高低温缺口冲击强度来区分。
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公开(公告)号：US08202964B2
公开(公告)日：2012-06-19
申请号：US13043080
申请日：2011-03-08
摘要： An initiator for cationic polymerization comprises a salt of a protic acid as well as a protic acid. The molar ratio of protic acid to salt is in the range from 1:0.01 to 1:2000. The initiator is used for example for cationic homo- or copolymerization of trioxane, and permits stable and flexible operation of the polymerization.
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