Recycled polyethylene terephthalate compositions, fibers and articles produced therefrom, and methods for producing same

Patent metadata

Field	Value
Publication number	US-9187849-B2
Application number	US-201313792571-A
Country	US
Kind code	B2
Filing date	Mar 11, 2013
Priority date	Sep 30, 2008
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

In one aspect, the invention relates to recycled polyethylene terephthalate compositions, fibers and articles produced therefrom, and methods for producing same. In a further aspect, the invention relates to homogenized post-consumer polyethylene terephthalate. In a further aspect, the invention relates to extruded polymer compositions, polymer mixtures, fibers, and/or Bulked Continuous Filament fibers comprising post-consumer polyethylene terephthalate. In a further aspect, the invention relates to processes for preparing recycled polyethylene terephthalate compositions. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

First claim

What is claimed is:

1. A process for preparing a recycled polyethylene terephthalate composition comprising the step of blending curbside post-consumer polyethylene terephthalate to homogeneity prior to mixing with virgin polyethylene terephthalate, wherein the homogeneously blended curbside post-consumer polyethylene terephthalate comprises impurities absent from virgin polyethylene terephthalate and wherein the impurities comprise floatable contamination present in an amount less than 25 ppm and PVC contamination present in an amount less than 150 ppm.

2. The process of claim 1 , comprising the steps of:
a. blending curbside post-consumer polyethylene terephthalate to homogeneity;
b. optionally, crystallizing the homogeneous curbside post-consumer polyethylene terephthalate;
c. drying the homogeneous curbside post-consumer polyethylene terephthalate;
d. mixing the homogeneous curbside post-consumer polyethylene terephthalate with virgin polyethylene terephthalate; and
e. extruding the mixture.

3. The process of claim 1 , wherein the homogeneously blended curbside post-consumer polyethylene terephthalate further comprises one or more Moisture content of less than 1.0%; Metal contamination of less than 10 ppm; Other non-melting particles of less than 50 ppm; Green PET contamination of less than 5000 ppm; Light blue contamination of less than 75,000 ppm; Low melt material of less than 50 ppm; and Black PET contamination of less than 50 ppm;
and wherein the homogeneously blended curbside post consumer polyethylene terephthalate has one or more of the following specifications: Bulk density (lb/ft3) of 20-27; Pressure rise (psi per pound) of less than 75 psi/lb; b Color values as measured by a HunterLabs Spectrophotometer of 0-3 units, and L Color values as measured by a HunterLabs Spectrophotometer of greater than 50 units.

4. A process for preparing a recycled polyethylene terephthalate composition comprising the step of mixing homogeneous curbside post-consumer polyethylene terephthalate with virgin polyethylene terephthalate prior to extrusion of the mixture wherein the homogeneously blended curbside post-consumer polyethylene terephthalate comprises impurities absent from virgin polyethylene terephthalate and wherein the impurities comprise floatable contamination present in an amount less than 25 ppm and PVC contamination present in an amount less than 150 ppm.

5. The process of claim 4 , comprising the steps of:
a. blending curbside post-consumer polyethylene terephthalate to homogeneity;
b. optionally, crystallizing the homogeneous curbside post-consumer polyethylene terephthalate;
c. drying the homogeneous curbside post-consumer polyethylene terephthalate;
d. mixing the homogeneous curbside post-consumer polyethylene terephthalate with virgin polyethylene terephthalate; and
e. extruding the mixture.

6. The process of claim 5 , wherein the homogeneously blended curbside post-consumer polyethylene terephthalate further comprises one or more Moisture content of less than 1.0%; Metal contamination of less than 10 ppm; Other non-melting particles of less than 50 ppm; Green PET contamination of less than 5000 ppm; Light blue contamination of less than 75,000 ppm; Low melt material of less than 50 ppm; and Black PET contamination of less than 50 ppm;
and wherein the homogeneously blended curbside post consumer polyethylene terephthalate has one or more of the following specifications: Bulk density (lb/ft3) of 20-27; Pressure rise (psi per pound) of less than 75 psi/lb; b Color values as measured by a HunterLabs Spectrophotometer of 0-3 units, and L Color values as measured by a HunterLabs Spectrophotometer of greater than 50 units.

7. A process for preparing a recycled polyethylene terephthalate composition comprising the step of extruding a mixture of homogeneous curbside post-consumer polyethylene terephthalate and virgin polyethylene terephthalate, wherein the homogeneously blended curbside post-consumer polyethylene terephthalate comprises impurities absent from virgin polyethylene terephthalate and wherein the impurities comprise floatable contamination present in an amount less than 25 ppm and PVC contamination present in an amount less than 150 ppm.

8. The process of claim 7 , comprising the steps of:
a. blending curbside post-consumer polyethylene terephthalate to homogeneity;
b. optionally, crystallizing the homogeneous curbside post-consumer polyethylene terephthalate;
c. drying the homogeneous curbside post-consumer polyethylene terephthalate;
d. mixing the homogeneous curbside post-consumer polyethylene terephthalate with virgin polyethylene terephthalate; and
e. extruding the mixture.

9. The process of claim 8 , wherein the homogeneously blended curbside post-consumer polyethylene terephthalate further comprises one or more Moisture content of less than 1.0%; Metal contamination of less than 10 ppm; Other non-melting particles of less than 50 ppm; Green PET contamination of less than 5000 ppm; Light blue contamination of less than 75,000 ppm; Low melt material of less than 50 ppm; and Black PET contamination of less than 50 ppm;
and wherein the homogeneously blended curbside post consumer polyethylene terephthalate has one or more of the following specifications: Bulk density (lb/ft3) of 20-27; Pressure rise (psi per pound) of less than 75 psi/lb; b Color values as measured by a HunterLabs Spectrophotometer of 0-3 units, and L Color values as measured by a HunterLabs Spectrophotometer of greater than 50 units.

10. A process for preparing a recycled polyethylene terephthalate composition comprising the step of blending curbside post-consumer polyethylene terephthalate to homogeneity prior to extrusion, wherein the homogeneously blended curbside post-consumer polyethylene terephthalate comprises impurities absent from virgin polyethylene terephthalate and wherein the impurities comprise floatable contamination present in an amount less than 25 ppm and PVC contamination present in an amount less than 150 ppm.

11. The process of claim 10 , comprising the steps of:
a. blending curbside post-consumer polyethylene terephthalate to homogeneity;
b. optionally, crystallizing the homogeneous curbside post-consumer polyethylene terephthalate;
c. drying the homogeneous curbside post-consumer polyethylene terephthalate;
d. mixing the homogeneous curbside post-consumer polyethylene terephthalate with virgin polyethylene terephthalate; and
e. extruding the mixture.

12. The process of claim 11 , wherein the homogeneously blended curbside post-consumer polyethylene terephthalate further comprises one or more Moisture content of less than 1.0%; Metal contamination of less than 10 ppm; Other non-melting particles of less than 50 ppm; Green PET contamination of less than 5000 ppm; Light blue contamination of less than 75,000 ppm; Low melt material of less than 50 ppm; and Black PET contamination of less than 50 ppm;
and wherein the homogeneously blended curbside post consumer polyethylene terephthalate has one or more of the following specifications: Bulk density (lb/ft3) of 20-27; Pressure rise (psi per pound) of less than 75 psi/lb; b Color values as measured by a HunterLabs Spectrophotometer of 0-3 units, and L Color values as measured by a HunterLabs Spectrophotometer of greater than 50 units.

13. The process of claim 1 , wherein the step of blending further comprises introducing an amount of an exogenous tracing marker into the curbside post-consumer polyethylene terephthalate and wherein homogeneity of the blend is tested by measuring exogenous tracing marker distribution in a sample.

14. The process of claim 10 , wher

Assignees

• Columbia Insurance Co

Inventors

• Booth Hubert J
• Bradley Christopher Eric
• Johnson Daniel Ray
• Keen Jr James Henry

Classifications

• D01F6/92

  of polyesters · CPC title

• Y02P20/143

  the feedstock being recycled material, e.g. plastics · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• Y10T428/1369

  Fiber or fibers wound around each other or into a self-sustaining shape [e.g., yarn, braid, fibers shaped around a core, etc.] · CPC title

• C08J11/04

  of polymers · CPC title