公开(公告)号：US20030114608A1

公开(公告)日：2003-06-19

申请号：US10295927

申请日：2002-11-15

Applicant: Fina Technology, Inc.

Inventor： Ronald Tharappel ,  Renaud Oreins ,  William Gauthier ,  David Attoe ,  Kevin McGovern ,  Michel Messiaen ,  David Rauscher ,  Kai Hortmann ,  Michel Daumerie

IPC: C08F002/00

CPC classification number: C08F10/06 ,  B01J4/002 ,  B01J19/1818 ,  B01J19/1837 ,  B01J2219/00006 ,  B01J2219/00094 ,  C08F4/6592 ,  C08F110/06 ,  C08F2410/05 ,  Y10S526/943 ,  C08F2/00 ,  C08F2/005 ,  C08F2/001

Abstract: The present invention relates to propylene polymerization process in a bulk loop reactor, and particularly to propylene polymerization process for polymerizing commercial quantities of polypropylene in a bulk loop reactor by sequentially introducing Ziegler-Natta and metallocene catalyst systems into the bulk loop reactor. In one embodiment, separate catalyst mixing systems are used to introduce a quantity of metallocene catalyst and Ziegler-Natta catalyst into the bulk loop reactor. The frequency rate at which the quantity of metallocene catalyst is introduced into the bulk loop reactor may be higher than the frequency rate at which the quantity of Ziegler-Natta catalyst is introduced. In another embodiment, a method of polymerizing propylene in a bulk loop reactor is provided which includes contacting a quantity of supported metallocene catalyst with a first quantity of scavenger, such as TEAL and or TIBAL, prior to injecting the supported metallocene catalyst into the bulk loop reactor and contacting a quantity of Ziegler-Natta catalyst system with a second quantity of scavenger prior to injecting the Ziegler-Natta catalyst system into the bulk loop reactor, wherein the second quantity of scavenger is greater that the first quantity of scavenger. In another embodiment, a method of contacting a flow of metallocene with a flow of propylene is provided. This method includes directing the flow of metallocene towards a junction, directing the flow of propylene towards the junction and maintaining a portion of the flow of metallocene separate from a portion of the flow propylene within a portion of the junction downstream of the flow of propylene into the junction. In another embodiment, a method of introducing a quantity of antifouling agent into a catalyst mixing system is provided. In this embodiment a portion of the antifouling agent is introduced at or downstream of a point of contact of a stream of propylene with a stream of catalyst. The antifouling agent may be a member, alone or in combination with other members, selected from the group consisting of Stadis 450 Conductivity Improver, Synperonic antifouling agent, and Pluronic antifouling agent.

公开(公告)号：US20030208007A1

公开(公告)日：2003-11-06

申请号：US10448571

申请日：2003-05-30

Applicant: Fina Technology, Inc.

Inventor： Lisa K. Albe ,  William R. Wheat ,  Jeff Nairn ,  Scott Cooper ,  Philippe VanDeurzen ,  Michel Daumerie

IPC: C08F008/06

CPC classification number: B29C47/0007 ,  B29C47/0009 ,  B29K2023/04 ,  B29K2023/12 ,  B29K2023/14 ,  C08F8/50 ,  C08F2800/20 ,  C08F2810/10 ,  C08F210/06 ,  C08F210/16 ,  C08F2500/11 ,  C08F2500/12 ,  C08F2500/21

Abstract: Polypropylene heterophasic copolymers are produced having increased impact strength through the use of controlled rheology techniques by the addition of a peroxide at conditions which increase the deactivation or half life of the peroxide. The increased half life slows down the vis-breaking process and allows better dispersion of rubber particles within the polymer. In this way, copolymers having a high melt flow can be prepared while obtaining high impact strength and lower stiffness values, without the need for additional elastomeric modifiers.

Abstract translation: 通过在增加过氧化物的失活或半衰期的条件下通过加入过氧化物，通过使用受控的流变学技术制备具有增加的冲击强度的聚丙烯异相共聚物。 增加的半衰期减慢了破坏过程，并允许橡胶颗粒在聚合物内更好的分散。 以这种方式，可以制备具有高熔体流动性的共聚物，同时获得高冲击强度和较低的刚度值，而不需要额外的弹性体改性剂。