# US 5,350,788 A · Method for reducing odors in recycled plastics and compositions relating thereto

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- Number: US 5,350,788 A
- Document ID: US5350788A
- Status: Granted
- Kind: A
- Application number: 08/029,747
- Filed: 1993-03-11
- Granted: 1994-09-27
- Earliest claimed: 1993-03-11
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Donna L. Visioli; Vincent Brodie, III
- Web page: https://patentgrep.com/patent/US5350788A

## CPC

- C08K 5/17: Amines; Quaternary ammonium compounds
- C08J 11/06: without chemical reactions
- C08L 101/00: Compositions of unspecified macromolecular compounds
- C08L 79/02: Polyamines
- Y02W 30/62: Plastics recycling; Rubber recycling
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

The present invention relates generally to recycled plastics which exhibit noxious odors. More specifically, the present invention is directed to a method of reducing unwanted odors in such recycled plastics by incorporating a polyalkylene imine ("PAI"), more preferably polyethylene imine ("PEI").

## Claims

### Claim 1

A method for reducing aldehyde odor of a recycled polymeric material, said method comprising the step of incorporating into the recycled polymeric material a polyalkylene imine.

### Claim 2

A composition comprising a blend of a recycled polymeric material comprising an aldehyde and polyalkylene imine.

### Claim 3 (depends on 2)

The composition of claim 2, wherein the weight ratio of polyalkylene imine to recycled polymer is in the range of about 0.001-30;100-100,000.

### Claim 4 (depends on 3)

The composition of claim 3 wherein the weight ratio of polyalkylene imine to recycled polymer is in the range of about 0.001-30;100.

### Claim 5 (depends on 4)

The composition of claim 4 wherein the polyalkylene imine in polyethylene imine having a molecular weight (determined by light scattering) of greater than about 500.

### Claim 6

A process of combining polyalkylene imine ("PAI") with a recycled polymer material, said process comprising the steps of:
mixing the components at a temperature sufficient to cause the PAI to form a dispersed phase defining microscopic particles of less than 10 microns.

### Claim 7 (depends on 4)

The process of claim 4 wherein the PAI particle size is less than 2 microns and the recycled polymer comprises high density polyethylene.

### Claim 8 (depends on 5, 7)

The process of claim 7, further comprising:
blending the mixture resulting from the process of claim 5 with a second polymeric material.