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    Fibrillation-resistant polypropylene tape
    1.
    发明申请
    Fibrillation-resistant polypropylene tape 审中-公开
    抗纤维聚丙烯胶带

    公开(公告)号：US20060009603A1

    公开(公告)日：2006-01-12

    申请号：US10888152

    申请日：2004-07-09

    Applicant: David Young ,  Mohan Gownder ,  Rob Rowland

    Inventor： David Young ,  Mohan Gownder ,  Rob Rowland

    IPC: C08F110/00

    CPC classification number: B29C55/06 ,  B29K2023/12 ,  D01D5/426 ,  D01F6/06

    Abstract: The present invention relates to fibrillation resistant polypropylene tape formed from the polymerization of propylene utilizing isospecific metallocene catalysts. The resulting polymerized isotactic polypropylene is heated, extruded and withdrawn as a film or sheet. The sheet is then slit longitudinally into tape segments and drawn in the longitudinal direction to a draw ratio of at least about 4.5:1 to produce an oriented tape. It has been found that these polypropylene tapes have improved resistance to fibrillation than those polypropylene tapes produced using Ziegler-Natta catalyst drawn at the same draw ratios.

    Abstract translation: 本发明涉及由使用异相茂金属催化剂的丙烯聚合形成的抗起纤抗菌聚丙烯带。 将所得聚合的全同立构聚丙烯作为膜或片材加热，挤出和取出。 然后将片材纵向狭缝切割成带段并沿纵向方向拉伸至至少约4.5:1的拉伸比，以产生取向的带。 已经发现，与使用以相同拉伸比拉伸的齐格勒 - 纳塔催化剂制备的那些聚丙烯带相比，这些聚丙烯带具有改善的抗纤维化性能。

    Polymerization process
    3.
    发明授权
    Polymerization process 失效
    聚合过程

    公开(公告)号：US6090872A

    公开(公告)日：2000-07-18

    申请号：US166360

    申请日：1998-10-05

    Applicant: Lisa Albe ,  Pamela Lawyer ,  Jay Nguyen ,  Mohan Gownder

    Inventor： Lisa Albe ,  Pamela Lawyer ,  Jay Nguyen ,  Mohan Gownder

    IPC: C08K5/1535 ,  C08K5/15

    CPC classification number: C08K5/1535

    Abstract: 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 A product stream containing the fluff and unreacted propylene is withdrawn from the reactor and at least a portion of the unreacted propylene is separated from the product stream.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.

    Abstract translation: 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。

    Reduced shrinkage in metallocene isotactic polypropylene fibers
    5.
    发明授权
    Reduced shrinkage in metallocene isotactic polypropylene fibers 失效

    公开(公告)号：US06565970B2

    公开(公告)日：2003-05-20

    申请号：US10007237

    申请日：2001-10-22

    Applicant: Mohan Gownder ,  Jay Nguyen

    Inventor： Mohan Gownder ,  Jay Nguyen

    IPC: D01F600

    CPC classification number: D01F6/06 ,  Y10T428/2913 ,  Y10T428/2967

    Abstract: 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.

    Syndiotactic polypropylene fibers
    6.
    发明授权
    Syndiotactic polypropylene fibers 失效

    公开(公告)号：US07025919B2

    公开(公告)日：2006-04-11

    申请号：US10112520

    申请日：2002-03-28

    Applicant: Mohan Gownder ,  Jay Nguyen

    Inventor： Mohan Gownder ,  Jay Nguyen

    IPC: D01D5/16 ,  D01F6/06

    CPC classification number: D01F6/06

    Abstract: A process for the production of partially oriented polypropylene fibers from syndiotactic polypropylene. Syndiotactic polypropylene is heated to a molten state and extruded to form a fiber preform. The fiber preform is spun at a forward spinning speed within the range of about 700–3500 meters per minute to produce a partially oriented fiber. The partially oriented fiber is wound without further substantial orientation of the fiber at a draw ratio of less than 1.5. By operating at a forward spinning speed of about 700 meters per minute or more, the partially oriented fiber has a greater tenacity than would be observed for a fiber formed from a corresponding spun isotactic polypropylene. The fiber preform is spun at a forward spinning speed of at least 100 meters per minute to provide a tenacity on the order of about 2 grams per denier or more. The fiber preform may be spun at a forward spinning speed of at least 1500 meters per minute to provide a tenacity of about 3 grams per denier.

    Method of producing polypropylene tapes
    8.
    发明授权
    Method of producing polypropylene tapes 有权
    生产聚丙烯带的方法

    公开(公告)号：US06758994B2

    公开(公告)日：2004-07-06

    申请号：US10112141

    申请日：2002-03-28

    Applicant: Mohan Gownder ,  George R. Rowland, Jr. ,  David Keith Young

    Inventor： Mohan Gownder ,  George R. Rowland, Jr. ,  David Keith Young

    IPC: B29B1110

    CPC classification number: B29C47/0004 ,  B29C47/0019 ,  B29C55/06 ,  B29K2023/12

    Abstract: The present invention relates to a process for making polymer tapes utilizing metallocene catalysts. An isotactic propylene polymer is prepared by polymerizing propylene in the presence of an isospecific metallocene catalyst. The resulting polypropylene is heated, extruded and withdrawn as a sheet. The sheet is then slit longitudinally into tape segments and drawn in the longitudinal direction to a draw ratio of at least about 4.5:1 to produce an oriented tape. It has been found that these polypropylene tapes have different characteristics than those polypropylene tapes produced using Ziegler-Natta catalyst drawn at the same draw ratios.

    Abstract translation: 本发明涉及使用茂金属催化剂制备聚合物带的方法。 通过在特异性茂金属催化剂存在下聚合丙烯来制备全同立构丙烯聚合物。 将所得聚丙烯作为片材加热，挤出和取出。 然后将片材纵向狭缝切割成带段并沿纵向方向拉伸至至少约4.5:1的拉伸比，以产生取向的带。 已经发现，这些聚丙烯带具有与使用以相同拉伸比拉伸的齐格勒 - 纳塔催化剂制备的聚丙烯带不同的特性。

    Polypropylene/polystyrene polymer blend, improved fibers produced from the blend and method of manufacturing
    9.
    发明授权
    Polypropylene/polystyrene polymer blend, improved fibers produced from the blend and method of manufacturing 失效
    聚丙烯/聚苯乙烯聚合物共混物，由共混物生产的改进的纤维和制造方法

    公开(公告)号：US06248835B1

    公开(公告)日：2001-06-19

    申请号：US09186961

    申请日：1998-11-05

    Applicant: Mohan Gownder ,  Baireddy Raghava Reddy ,  Jay Nguyen

    Inventor： Mohan Gownder ,  Baireddy Raghava Reddy ,  Jay Nguyen

    IPC: C08L2300

    CPC classification number: C08L23/10 ,  C08L25/04 ,  C08L2203/12 ,  Y10T428/2929 ,  Y10T428/2964 ,  Y10T428/2967 ,  C08L2666/04

    Abstract: A polymer blend, fibers manufactured from the blend and method of producing the fibers is disclosed. The polymer blend includes from 92 wt % to 98.5 wt % of a base polypropylene having a melt flow rate of less than 20 g/10 min, and a maximum draw ratio D, a Crimp Stability of CS, when drawn into filaments at 1000 m/sec, and from 8 wt % to 1.5 wt % of an amorphous polystyrene having a melt flow rate of less than 15 g/10 min. The polymer blend is drawable at greater than 800 m/sec to produce filaments having a maximum draw ratio of D2, the ratio of D2: D1, being greater than 1.15:1 and a Crimp Stability of CS2, the ratio of CS2: CS1 being greater than 1.45. Preferably, the base polypropylene has a melt flow rate of between 8 and 15 g/10 min. In one embodiment, the amorphous polystyrene is characterized by a melt flow between 2 and 15 g/10 min., a tensile strength of between 6000 and 9000 psi, a modulus of between 250,000 and 500,000 psi, a flexural strength of between 8000 and 16,000 psi, a flexural modulus of between 300,000 and 500,000 psi, a Vicat softening point of between 180° F. and 240° F., and an annealed heat distortion of between 170° F and 220° F.

    Abstract translation: 公开了一种聚合物共混物，由共混物制造的纤维和生产纤维的方法。 聚合物共混物包括92重量％至98.5重量％的熔体流动速率小于20克/ 10分钟的基础聚丙烯和最大拉伸倍率D，CS在1000微米长丝拉伸时的卷曲稳定性 /秒，和8重量％至1.5重量％的熔体流动速率小于15克/ 10分钟的无定形聚苯乙烯。 聚合物共混物可以以大于800m /秒的速度拉伸，以产生最大拉伸比为D2，D2:D1的比例大于1.15:1的长丝和CS2的压接稳定性，CS2：CS1的比例为 大于1.45。 优选地，基础聚丙烯的熔体流动速率为8-15g / 10min。 在一个实施方案中，无定形聚苯乙烯的特征在于熔体流动在2至15g / 10min之间，拉伸强度在6000至9000psi之间，模量在250,000至500,000psi之间，弯曲强度在8000至16,000之间 psi，弯曲模量在300,000和500,000psi之间，维卡软化点在180°F和240°F之间，退火热变形在170°F和220°F之间。

    Syndiotactic polypropylene fibers
    10.
    发明申请
    Syndiotactic polypropylene fibers 审中-公开

    公开(公告)号：US20060202377A1

    公开(公告)日：2006-09-14

    申请号：US11317813

    申请日：2005-12-22

    Applicant: Mohan Gownder ,  Jay Nguyen

    Inventor： Mohan Gownder ,  Jay Nguyen

    IPC: B29C41/24

    CPC classification number: D01F6/06

    Abstract: A process for the production of partially oriented polypropylene fibers from syndiotactic polypropylene. Syndiotactic polypropylene is heated to a molten state and extruded to form a fiber preform. The fiber preform is spun at a forward spinning speed within the range of about 700-3500 meters per minute to produce a partially oriented fiber. The partially oriented fiber is wound without further substantial orientation of the fiber at a draw ratio of less than 1.5. By operating at a forward spinning speed of about 700 meters per minute or more, the partially oriented fiber has a greater tenacity than would be observed for a fiber formed from a corresponding spun isotactic polypropylene. The fiber preform is spun at a forward spinning speed of at least 100 meters per minute to provide a tenacity on the order of about 2 grams per denier or more. The fiber preform may be spun at a forward spinning speed of at least 1500 meters per minute to provide a tenacity of about 3 grams per denier.

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