IP Library › Granted Patent US 7,794,824
Granted Patent B2
US 7,794,824 · App. 11/767,612 · Granted Sep 14, 2010

Carbon fibers from kraft softwood lignin

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Quick Facts
Patent No.
US 7,794,824
App. No.
11/767,612
Granted
Sep 14, 2010
Kind
B2
Abstract

An acetylated softwood lignin fiber having a diameter of 5 to 100 microns.

Claims (4)

1. A melt spun acetylated softwood lignin fiber having a diameter of 5 to 100 microns and wherein the acetyl content of the lignin is between 16% and 22% by weight as measured by de-acetylation in alkali followed by ion chromatography.

2. The melt spun acetylated softwood lignin fiber of claim 1 wherein the acetyl content of the lignin is between 18% and 20% by weight as measured by de-acetylation in alkali followed by ion chromatography.

3. The melt spun acetylated softwood lignin fiber of claim 1 wherein the melt spun acetylated softwood lignin fiber has a diameter of 10 to 50 microns.

4. The melt spun acetylated softwood lignin fiber of claim 3 wherein the acetyl content of the lignin is between 18% and 20% by weight as measured by de-acetylation in alkali followed by ion chromatography.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 5, 2019
From: WEYERHAEUSER NR COMPANY
To: INTERNATIONAL PAPER COMPANY
Reel/Frame 049964/0838 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 21, 2009
From: WEYERHAEUSER COMPANY
To: WEYERHAEUSER NR COMPANY
Reel/Frame 022835/0233 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 6, 2007
From: ECKERT, ROBERT C.; ABDULLAH, ZIA
To: WEYERHAEUSER COMPANY
Reel/Frame 019527/0635 →