IP Library › Granted Patent US 8,716,434
Granted Patent B2
US 8,716,434 · App. 13/559,678 · Granted May 6, 2014

Aramid copolymer

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Quick Facts
Patent No.
US 8,716,434
App. No.
13/559,678
Granted
May 6, 2014
Kind
B2
Abstract

The invention concerns polymer comprising 2-(4-amino phenyl)-5 (6) amino benzimidazole (DAPBI), PPD, and terephthaloyl dichloride, the polymer having a IPC peak block ratio of 1.52 to 1.56 and an inherent viscosity of greater than 2 dl/g.

Claims (6)

1. A polymer comprising 2-(4-amino phenyl)-5 (6) amino benzimidazole (DAPBI), PPD, and terephthaloyl dichloride, the polymer having a IPC peak block ratio of 1.52 to 1.56 and an inherent viscosity of greater than 2 dl/g.

2. The polymer of claim 1 having an inherent viscosity of 4 dl/g or greater.

3. The polymer of claim 1 , having a IPC peak block ratio of 1.53 to 1.55.

4. The polymer of claim 1 wherein said polymer is capable of being dissolved in a solvent system comprising (i) N-methyl-2-pyrrolidone (NMP) or dimethylacetamide (DMAC) and (ii) an inorganic salt; wherein said polymer is capable of being redissolved in said solvent system after said polymer has been removed from said solvent system.

5. The polymer of claim 4 having an inherent viscosity of greater than 2 dl/g.

6. The polymer of claim 5 having an inherent viscosity of 4 dl/g or greater.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 25, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT SAFETY & CONSTRUCTION, INC.
Reel/Frame 049585/0450 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 19, 2012
From: LEE, KIU-SEUNG
To: E. I. DU PONT DE NEMOURS AND COMPANY
Reel/Frame 028809/0248 →