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    • 3. 发明授权
    • Polymerization process
    • 聚合过程
    • US6090872A
    • 2000-07-18
    • US166360
    • 1998-10-05
    • Lisa AlbePamela LawyerJay NguyenMohan Gownder
    • Lisa AlbePamela LawyerJay NguyenMohan Gownder
    • C08K5/1535C08K5/15
    • C08K5/1535
    • A process for the production and treatment of a stereoregular polypropylene, such as isotactic polypropylene in which a polymerization reactor is operated under conditions to react propylene supplied to the reactor to produce a stereoregular propylene polymer fluff. A product stream containing the fluff and unreacted propylene is withdrawn from the reactor and at least a portion of the unreacted propylene is separated from the product stream. The propylene polymer fluff is heated to a temperature sufficient to melt the propylene polymer, and a lactone is incorporated into the propylene polymer. The lactone is a 5,7 dialkyl-3-(2,3 dialkyl phenyl)-3H-benzofuran-2-one, in which the 5,7 and 2,3 substituents are of relatively low molecular weights. The phenyl alkyl substituents, each contain 1 or 2 carbon atoms, and the 5,7 alkyl substituents each contain from 2 to 5 carbon atoms. After the heating and incorporation of the lactone, the heated polymer fluff containing the lactone is extruded to produce particles of the propylene polymer. The polymer particles containing the lactone can be heated to a molten state and then extruded to form a fiber preform. The fiber preform is subject to spinning and drawing at differential spinning and drawing speeds to provide a draw ratio sufficient to form a continuous polypropylene fiber.
    • 一种制备和处理立体规则聚丙烯的方法,例如全同立构聚丙烯,其中聚合反应器在提供给反应器的丙烯反应产生立体规则丙烯聚合物绒毛的条件下运行。 将含有绒毛和未反应的丙烯的产物流从反应器中排出,至少一部分未反应的丙烯与产物流分离。 将丙烯聚合物绒毛加热至足以熔化丙烯聚合物的温度,并将内酯加入到丙烯聚合物中。 内酯是5,7-二烷基-3-(2,3-二烷基苯基)-3H-苯并呋喃-2-酮,其中5,7和2,3个取代基具有相对​​较低的分子量。 苯基烷基取代基各自含有1或2个碳原子,5,7个烷基取代基各自含有2至5个碳原子。 加热并加入内酯后,将含有内酯的加热聚合物绒毛挤出以产生丙烯聚合物的颗粒。 可以将含有内酯的聚合物颗粒加热至熔融状态,然后挤出以形成纤维预制件。 在不同的纺丝和拉伸速度下对纤维预制件进行纺丝和拉伸,以提供足以形成连续聚丙烯纤维的拉伸比。
    • 7. 发明授权
    • Reduced shrinkage in metallocene isotactic polypropylene fibers
    • 茂金属全同立构聚丙烯纤维的收缩率降低
    • US06416699B1
    • 2002-07-09
    • US09328924
    • 1999-06-09
    • Mohan GownderJay Nguyen
    • Mohan GownderJay Nguyen
    • D01D516
    • D01F6/06Y10T428/2913Y10T428/2967
    • The present invention relates to a method for the production of polypropylene fibers resulting in improved shrinkage percentages and to polypropylene fibers themselves having improved shrinkage percentages. The method includes providing a polypropylene polymer with a melt flow index of no more than about 25 grams per 10 minutes. This polymer should include isotactic polypropylene produced by the polymerization of propylene in the presence of an isospecific metallocene catalyst. The polymer is then heated to a molten state and extruded to form a fiber preform. The preform is spun and subsequently drawn at a take-away speed and a drawing speed providing a draw ratio of no more than about 3, and more preferably no more than about 2.5, to produce a continuous polypropylene fiber. The fiber based on metallocene catalyzed isotactic polypropylene demonstrates improved shrinkage properties of at least about 10% and at some draw ratios at least about 25% over the shrinkage properties of Ziegler-Natta catalyzed isotactic polypropylenes having similar melt-flow indices. In the same method, when the polymer is heated to a molten state, the polymer is preferably heated in a feeding zone to a temperature within the range of about 180° C. to about 225° C. followed by heating in an extrusion zone to a temperature within the range of about 215° C. to about 240° C. immediately prior to extruding the polymer.
    • 本发明涉及一种生产提高收缩率的聚丙烯纤维的方法以及具有改善的收缩率的聚丙烯纤维本身。 该方法包括提供熔体流动指数不超过约25克/ 10分钟的聚丙烯聚合物。 该聚合物应包括通过在特殊的茂金属催化剂存在下丙烯聚合制备的全同立构聚丙烯。 然后将聚合物加热至熔融状态并挤出以形成纤维预制件。 将预型件纺丝并随后以取出速度和拉伸速度拉伸,其拉伸比不超过约3,更优选不超过约2.5,以产生连续的聚丙烯纤维。 基于茂金属催化的全同立构聚丙烯的纤维显示出具有相似熔体流动指数的齐格勒 - 纳塔催化的全同立构聚丙烯的收缩性能至少为约10%且在一定拉伸比下至少为约25%的改进的收缩性能。 以相同的方法,当将聚合物加热至熔融状态时,聚合物优选在进料区中加热至约180℃至约225℃的温度,然后在挤出区中加热至 在挤出聚合物之前的温度在约215℃至约240℃的范围内。
    • 8. 发明授权
    • Polypropylene fibers
    • 聚丙烯纤维
    • US6146758A
    • 2000-11-14
    • US303728
    • 1999-05-03
    • Mohan R. GownderEduardo E. ZamoraJay Nguyen
    • Mohan R. GownderEduardo E. ZamoraJay Nguyen
    • C08F4/642C08F4/6592C08F110/00C08F110/06D01F6/06
    • D01F6/06Y10T428/2913Y10T428/2967
    • Process for the production of polypropylene fibers from polypropylene polymers produced by the polymerization of polypropylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. The polypropylene contains 0.5 to 2% 2,1 insertions and has an isotacticity of at least 95% meso diads and is heated to a molten state and extruded to form a fiber preform. The preform is subjected to spinning at a spinning speed of at least 500 meters per minutes and subsequent drawing at a speed of at least 1,500 meters per minute to provide a draw ratio of at least 3 to produce a continuous polypropylene fiber. The draw speed and/or the draw ratio can be varied to produce fibers of different mechanical properties. Different polypropylene polymers produced by different metallocene catalysts can be used. Such fibers can be characterized by having an elongation at break of at least 100% and a specific toughness of at least 0.5 grams per denier.
    • 通过在茂金属催化剂存在下聚丙烯聚合生产聚丙烯聚丙烯的方法,其特征在于在近端位置被取代的桥连外消旋双(茚基)配体。 聚丙烯含有0.5至2%的2,1插入并且具有至少95%的内消旋二聚体的全同立构规整度,并被加热至熔融状态并挤出以形成纤维预制件。 以每分钟至少500米的纺丝速度进行纺丝,然后以至少1500米/分钟的速度拉伸,以提供至少3的拉伸比,以生产连续的聚丙烯纤维。 拉伸速度和/或拉伸比可以变化以产生不同机械性能的纤维。 可以使用由不同茂金属催化剂制备的不同的聚丙烯聚合物。 这种纤维的特征在于具有至少100%的断裂伸长率和至少0.5克/旦尼尔的比韧度。
    • 9. 发明授权
    • Process of making polypropylene fiber
    • 制造聚丙烯纤维的工艺
    • US5908594A
    • 1999-06-01
    • US936254
    • 1997-09-24
    • Mohan R. GownderEduardo E. ZamoraJay Nguyen
    • Mohan R. GownderEduardo E. ZamoraJay Nguyen
    • C08F4/642C08F4/6592C08F110/00C08F110/06D01F6/06D01D5/16
    • D01F6/06Y10T428/2913Y10T428/2967
    • Process for the production of polypropylene fibers from polypropylene polymers produced by the polymerization of polypropylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. The polypropylene contains 0.5 to 2% 2,1 insertions and has an isotacticity of at least 95% meso diads and is heated to a molten state and extruded to form a fiber preform. The preform is subjected to spinning at a spinning speed of at least 500 meters per minutes and subsequent drawing at a speed of at least 1,500 meters per minute to provide a draw ratio of at least 3 to produce a continuous polypropylene fiber. The draw speed and/or the draw ratio can be varied to produce fibers of different mechanical properties. Different polypropylene polymers produced by different metallocene catalysts can be used. Such fibers can be characterized by having an elongation at break of at least 100% and a specific toughness of at least 0.5 grams per denier.
    • 通过在茂金属催化剂存在下聚丙烯聚合生产聚丙烯聚丙烯的方法,其特征在于在近端位置被取代的桥连外消旋双(茚基)配体。 聚丙烯含有0.5至2%的2,1插入并且具有至少95%的内消旋二聚体的全同立构规整度,并被加热至熔融状态并挤出以形成纤维预制件。 以每分钟至少500米的纺丝速度进行纺丝,然后以至少1500米/分钟的速度拉伸,以提供至少3的拉伸比,以生产连续的聚丙烯纤维。 拉伸速度和/或拉伸比可以变化以产生不同机械性能的纤维。 可以使用由不同茂金属催化剂制备的不同的聚丙烯聚合物。 这种纤维的特征在于具有至少100%的断裂伸长率和至少0.5克/旦尼尔的比韧度。