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Preparation of multimodal, high density, ethylene homopolymer barrier resins and films

a technology of homopolyethylene and barrier resin, which is applied in the direction of synthetic resin layered products, layered products, chemistry apparatus and processes, etc., can solve the problems of complex coextusion process, high cost and complexity of producing multilayer films, and increase the cost and complexity of producing these films. , to achieve the effect of high density

Active Publication Date: 2011-06-09
EQUSR CHEM LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resulting resin provides films with enhanced barrier properties, reducing production costs and complexity by offering a cost-effective, single-layer or multilayer solution for packaging applications with improved water vapor and oxygen barrier performance.

Problems solved by technology

The addition of metalized films or metal oxides increases the cost and complexity of producing these films.
Although these laminated films have low WVTR and OTR, they tend to be more expensive to produce than polyolefin films.
In addition, multilayer films are made by complex coextrusion processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025]A Ziegler-Natta catalyst is prepared by reacting or mixing titanium tetrachloride, ethylaluminum dichloride, polymethylhydridosiloxane, dibutyl magnesium, ethylaluminium dichloride, and tetraisopropyltitanate in accordance with the general procedure disclosed in U.S. Pat. No. 4,511,669. The catalyst is slurried with hexane to the desired titanium concentration. Hexane, the catalyst slurry, triethylaluminum (TEAL) cocatalyst, cyclohexylmethyldimethoxy-silane (CMDS) modifier, ethylene, hydrogen and antistatic agent (oleylbis(2-hydroxyethyl)amine) are continuously fed to a first reactor in amounts given in Table 1 to produce a low molecular weight, homopolyethylene component. Melt index MI2 and density of the first homopolyethylene component are listed in Table 1.

[0026]The reaction mixture from the first reactor is continuously transferred to a flash drum where hydrogen and unreacted ethylene are removed. The reaction mixture recovered from the flash drum containing the homopolye...

example 3

[0029]Example 1 is essentially repeated but the catalyst is prepared by reacting or mixing titanium tetrachloride, ethylaluminum dichloride, polymethylhydridosiloxane, dibutyl magnesium, ethylaluminium dichloride, ethanol and isopropanol in accordance with the general procedure disclosed in U.S. Pat. No. 4,464,518 and diluted with hexane to the desired titanium concentration. Feed rates and polymerization conditions employed in the first and second reactors and properties of the first homopolyethylene component and final barrier resin product are reported in Table 1.

TABLE 1Ex. No.Ex.1C. Ex. 2Ex.3First Reactor PolymerizationPressure (psig)9071106Temperature (° C.)808080Ethylene (lbs / hr)29.229.229.4Antistatic agent (lbs / hr)0.00160.00180.007Hexane (lbs / hr)166166166Catalyst Slurry (moles0.001690.001250.00372Ti / hr)Cocatalyst (moles / hr)0.0660.0850.159CMDS (ppm based on16016hexane)H2 / Ethylene molar ratio1.92.12.7(vapor space)First Reactor Polymer PropertiesMI2 (g / 10 min)141446Density (g / cm...

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Abstract

Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is homopolymerized in the presence of a Ziegler-Natta catalyst, organoaluminum cocatalyst, alkoxysilane modifier, and hydrogen. The reaction mixture from the first stage is devolatilized to remove all or substantially all of the hydrogen. The polymerization continues in a second stage wherein ethylene is added to the devolatilized reaction mixture to produce the barrier resin. The barrier resin provides films with improved barrier properties.

Description

FIELD OF THE INVENTION[0001]The invention relates to multimodal, high density, homopolyethylene barrier resins and films. More particularly, the invention relates to multimodal, high density, homopolyethylene barrier resins produced with Ziegler-Natta catalysts in the presence of an alkoxysilane modifier.BACKGROUND OF THE INVENTION[0002]Polyethylene resins are used to prepare food packaging films, grocery bags, stretch-wrap films, shrink-wrap films, garbage can liners and shipping bags. Some applications, such as wrapping raw or prepared food, require films that have low water vapor and oxygen transmission rates to preserve the contents.[0003]Packaging films with low water vapor transmission rates (WVTR) and low oxygen transmission rates (OTR) are generally produced using laminating foil, metalized films (e.g., aluminum on poly(ethylene terephthalate) or polyethylene), or through the use of metal oxides (e.g., silicon dioxide (SiO2), titanium oxide (TiO2) or aluminum oxide (Al2O3)),...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F110/02
CPCB32B27/08B32B27/32C08F110/02C08J5/18C08J2323/06C08F4/6465C08F2500/05C08F2500/07C08F2500/12C08F2500/26
Inventor MEHTA, SAMEER D.MAVRIDIS, HARILAOSHALEY, JEFFREY C.GARRISON, PHILIP J.BORKE, JEFFREY S.
Owner EQUSR CHEM LP