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Sulfopolyester recovery

A sulfopolyester, water recycling technology, used in plastic recycling, recycling technology, transportation and packaging, etc.

Active Publication Date: 2008-12-10
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the previously described problems by providing a process for the recovery of water dispersible sulfopolyesters from aqueous dispersions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]In this example, a 30% by weight aqueous dispersion of Eastman AQ-55S sulfopolyester polymer available from Eastman Chemical Company was prepared in deionized water. Precipitation of the sulfopolyester polymer in aqueous dispersion used a 1 mole / liter potassium acetate solution which was added until the sulfopolyester precipitated to yield recovered sulfopolyester. The recovered sulfopolyester was filtered, washed with deionized water, centrifuged and decanted. The recovered sulfopolyester was washed three more times in the same way. The recovered sulfopolyester was vacuum dried at 45°C and 24 mm Hg vacuum to give a yield of 87.6 wt%. The recovered sulfopolyester was then successfully melt spun into fibers at a melt temperature of 240°C using an Instron capillary rheometer at a speed of 1900 fpm and a throughput of 0.06 g / min. The rheometer is equipped with a single hole die with a 0.027 inch hole diameter. The polymer melt is extruded at a defined melt temperature an...

Embodiment 2

[0066] A 30% by weight aqueous dispersion of Eastman AQ-55S sulfopolyester polymer was precipitated using a 1 mole / liter potassium acetate solution to produce recycled sulfopolyester. The recovered sulfopolyester polymer was then filtered through a 180 mesh screen and washed three times with deionized water. The recovered sulfopolyester polymer was vacuum dried at 45°C and 24 mm Hg vacuum to give a yield of 74.8 wt%. The recovered sulfopolyester polymer was then successfully melt spun into fibers at 240°C using the Instron capillary rheometer of Example 1 at a speed of 2000 fpm and a throughput of 0.06 g / min. As a comparison, virgin Eastman AQ-55S sulfopolyester polymer prepared as a 30% by weight dispersion in water was also melt spun at 240°C using the method described in Example 1 at a speed of 1320 fpm and a throughput of 0.06 g / min. into fibers.

Embodiment 3

[0068] A 30% aqueous dispersion of a sulfopolyester polymer having the same chemical composition as Eastman AQ-55S and an intrinsic viscosity of about 0.25 was prepared. 140 grams of this aqueous dispersion were precipitated by adding 30 g of a 1 mole / liter potassium acetate solution to produce recovered sulfopolyester. The recovered sulfopolyester was filtered, washed twice with deionized water, and vacuum dried at 70°C and 24 mm Hg vacuum. The recovered sulfopolyester polymer was successfully melt spun into fibers using the Instron capillary rheometer of Example 1 at a speed of 3000 fpm and a throughput of 0.06 g / min, and also at 240° C. at a speed of 4200 fpm and a throughput of 0.2 g / min. min throughput is successfully melt-spun into fibers.

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PUM

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Abstract

Processes for the recovery of a sulfopolyester polymer from an aqueous dispersion and a sulfopolyester concentrate are provided. Particularly, a sulfopolyester concentrate, from which the sulfopolyester may be recovered and reused, are formed by processes such as evaporation and / or nanofiltration. Final recovery of the sulfopolyester may be achieved by further evaporation of water and / or salt precipitation. In addition, the recovered sulfopolyester and articles manufactured from the recovered sulfopolyester are also provided.

Description

field of invention [0001] The present invention generally relates to methods of recovering sulfopolyester polymers from aqueous dispersions and concentrated aqueous sulfopolyester dispersions. More specifically, the process of the present invention involves concentrating a dilute aqueous dispersion of sulfopolyester and recovering the sulfopolyester thereby. The present invention further relates to recycled sulfopolyesters, aqueous dispersions of sulfopolyesters, sulfopolyester concentrates, and articles comprising recycled sulfopolyesters and sulfopolyester concentrates. Background of the invention [0002] Water dispersible polymers, especially sulfopolyester polymers, for forming fibers and fibrous articles such as nonwovens, bicomponent fibers, films, clothing items, personal care products such as wipes, feminine Hygienic products, diapers, adult incontinence briefs, hospital / surgical and other medical disposables, protective fabrics and scrims, geotextiles, industrial ...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08J11/06
CPCC08J11/06C08J2381/00Y10T428/2913Y02W30/62C08G63/89C08G63/90
Inventor R·K·古普塔A·L·克赖因D·W·克洛西维茨S·E·乔治徐甲植
Owner EASTMAN CHEM CO
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