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Antifoulant for Impact Copolymers and Method

A technology of impact copolymerization and copolymer, which is applied in the field of multiphase copolymer and copolymer production, can solve problems such as harmful production efficiency, achieve the effect of reducing production failure time and inhibiting reactor fouling

Active Publication Date: 2014-07-02
WR GRACE & CO CONN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such reactor fouling is a particular problem because it causes reactor shutdowns that are detrimental to production efficiency

Method used

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  • Antifoulant for Impact Copolymers and Method
  • Antifoulant for Impact Copolymers and Method
  • Antifoulant for Impact Copolymers and Method

Examples

Experimental program
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Embodiment 1

[0143] Two polypropylene fluidized bed reactors are connected in series to produce propylene impact copolymer. The propylene impact copolymer comprises a propylene homopolymer produced in the first reactor (Reactor 1) and a propylene / ethylene copolymer produced in the second reactor (Reactor 2). The catalyst system is a Ziegler-Natta supported catalyst mixed with an aluminum alkyl activator and an external donor (selectivity control agent). Hydrogen was fed to both reactors simultaneously, controlling the melt flow. The selectivity control agent (SCA) fed to Reactor 1 comprised a mixture of 60 mol% isopropyl myristate and 40 mol% dicyclopentyldimethylsilane. A multi-component anti-fouling agent comprising 95 mol% isopropyl myristate and 5 mol% dicyclopentyldimethylsilane was fed into Reactor 2 to inhibit fouling and control rubber content (Fc). Table 1 shows the reactor conditions for the five tests (A-E). Tests A-E show that increasing amounts of multicomponent antifouling...

Embodiment 2

[0148] Two polypropylene fluidized bed reactors are connected in series to produce propylene impact copolymer. The propylene impact copolymer comprises a propylene homopolymer produced in the first reactor (Reactor 1) and a propylene / ethylene copolymer produced in the second reactor (Reactor 2). The catalyst system is a Ziegler-Natta supported catalyst mixed with an aluminum alkyl activator and an external donor (selectivity control agent). Hydrogen was fed to both reactors simultaneously, controlling the melt flow. The selectivity control agent (SCA) fed to Reactor 1 comprised a mixture of 60 mol% isopropyl myristate and 40 mol% dicyclopentyldimethylsilane. A multi-component anti-fouling agent comprising 95 mol% isopropyl myristate and 5 mol% n-propyltrimethylsilane was fed into Reactor 2 to inhibit fouling and control rubber content (Fc). Table 2 shows the reactor conditions for the three tests (F-H). For Tests F-H, increasing amounts of multicomponent antifouling agent (...

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Abstract

The present invention provides methods for producing heterophasic copolymers. The method includes introducing an anti-fouling agent into a second polymerization reactor operated in series with the first polymerization reactor. The anti-fouling agent may be a multi-component anti-fouling agent and / or coating agent. The provision of either anti-fouling agent enables the production of heterophasic copolymers having an Fc value of from about 10% to about 50% by inhibiting reactor fouling during polymerization.

Description

[0001] priority claim [0002] This application claims priority from US Provisional Application 61 / 140,909, filed December 26, 2008, which is hereby incorporated by reference in its entirety. Background technique [0003] The present disclosure relates to methods of producing heterophasic copolymers exhibiting reduced or no fouling of reactors, and to heterophasic copolymers produced by such methods. [0004] A heterophasic polymer, such as an impact copolymer, is characterized by a continuous polymer phase and a discontinuous phase of polymer dispersed throughout the continuous polymer phase. Conventional impact copolymer production methods are carried out in a two-stage process. The first polymer (continuous phase) is produced in one or more reactors. The product of this first stage is then moved from the first reactor to a second reactor where a second polymer (discontinuous phase) is produced and incorporated into the continuous phase. Within the matrix, an impact copol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F2/00
CPCC08F210/06C08F10/00C08F110/06C08F2/001C08F2/005C08F2500/12C08F210/16C08F2/00C08J3/12Y10T428/2998
Inventor J.W.范艾格蒙德R.B.佩因特Z.库利克J.D.维利兹科
Owner WR GRACE & CO CONN
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