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Methods for making polyolefins

A technology for polyolefins and olefin monomers, which is used in the field of controlling product properties during polyolefin polymerization, and can solve problems such as influence

Active Publication Date: 2014-01-08
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, in some cases changing the split affects more than one variable

Method used

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  • Methods for making polyolefins
  • Methods for making polyolefins
  • Methods for making polyolefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Example 1: Hydrogen Response

[0135] The hydrogen ratio determined from run to run varied widely, ranging from 0.00075 to 0.003 hydrogen / ethylene ratio. The main reason for varying the hydrogen concentration is to correct the product MFR, the results for the blow molded product are out of the ordinary compared to the tube molded product formed with the same catalyst. The selected MFR results at different hydrogen levels are listed in Table 1.

[0136] Table 1. The various H 2 / C 2 Gas composition ratio and MFR resin at or near 30dg / min flow index

[0137] h 2 / C 2

FI

MFR

0.00075

27.0

109

0.001

30.7

186

0.0015

28.8

240

[0138] It can be seen from the data in Table 1 that the MFR has a sensitive dependence on the hydrogen concentration while using the blow molding catalyst. Higher hydrogen concentrations lead to higher MFR, which is the opposite of the trend normally seen in ...

Embodiment 2

[0140] Example 2: MFR value

[0141]The MFR values ​​for selected product fractions are listed in Table 2. Catalyst A is bis(2,3,4,5,6-pentamethylphenylamidoethyl)amine dibenzylzirconium. Catalyst B is bis(n-butylcyclopentadienyl)zirconium dichloride. Catalyst C is (tetramethylcyclopentadienyl)(n-propylcyclopentadienyl)zirconium dichloride. The above catalysts were purchased from Univation Technologies, LLC (Houston, TX).

[0142] Table 2. MFR values ​​of blown catalysts under various reaction conditions

[0143] run#

[0144] From Table 2 it was surprisingly and unexpectedly found that for a particular catalyst the MFR decreases with decreasing hydrogen concentration.

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Abstract

A method for making a polyolefin composition according to one embodiment includes altering the concentration of the chain transfer agent present in the reactor to control the HMW and LMW fractions of the polyolefin composition.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Application 61 / 003,792, filed November 20, 2007, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a production method of polyolefin. More specifically, the present invention relates to a method of controlling product properties during the polymerization of polyolefins. Background technique [0004] The terms "bimodal" or "multimodal" as applied to polyolefin resins generally mean that the resin has at least two different ranges of molecular weight, giving the product a wide variety of properties. Bimodal resins are usually made in two separate reactors in series, e.g. a product of a first molecular weight made in a first reaction zone is taken directly from the first reaction zone and introduced into a second reaction zone zones, which generally provide different polymerization conditions f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F2/38
CPCC08F10/00C08F210/16C08F4/65916C08F2420/02C08F4/65925C08F4/659C08F4/6592C08F2/38C08F2/00C08F4/65904C08F2500/12C08F2500/07
Inventor 马克·B·戴维斯桑-川·考泰·洪恩·克瓦勒克
Owner UNIVATION TECH LLC