IP Library › Granted Patent US 7,009,082
Granted Patent B2
US 7,009,082 · App. 10/634,687 · Granted Mar 7, 2006

Removal of color bodies from polytrimethylene ether glycol polymers

Assignee: E.I. du Pont de Nemours and Company
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Quick Facts
Patent No.
US 7,009,082
App. No.
10/634,687
Granted
Mar 7, 2006
Kind
B2
Abstract

A process is described for reducing the discoloration of PO3G. The discolored polymer is contacted with adsorbent and separated therefrom, for instance, by filtration. The treated polytrimethylene, preferably, has an APHA color of less than about 50 and a molecular weight of about 250 to about 5000.

Claims (6)

1. A product comprising: (i) PO3G having color and (ii) activated carbon, wherein the PO3G has a APHA color of less then about 50.

2. The product of claim 1 , wherein the PO3G has a APHA color of less than about 40.

3. The product of claim 1 , wherein the color of the PO3G has a APHA color of less than 30.

4. The product of claim 1 , wherein the color of the PO3G has a APHA color of less than about 20.

5. The product of claim 1 , containing about 0.25% to about 5%.

6. The product of claim 1 , containing about 1% to about 3% activated carbon.

Assignments (3)
CORRECTIVE ASSIGNMENT TO CORRECT THE ENTITY TYPE PREVIOUSLY RECORDED AT REEL: 049879 FRAME: 0043. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Sep 6, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT INDUSTRIAL BIOSCIENCES USA, LLC
Reel/Frame 050300/0408 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 26, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT INDUSTRIAL BIOSCIENCES USA, LLC
Reel/Frame 049879/0043 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 29, 2003
From: SUNKARA, HARI BABU; DO, HIEP QUANG
To: E.I. DU PONT DE NEMOURS AND COMPANY
Reel/Frame 014219/0092 →
Continuity (2)
Provisional Application 6046822600 · May 6, 2003
Related Publication 20040225162A1 · Nov 11, 2004