IP Library Granted Patent US 7,585,441
Granted Patent B2
US 7,585,441 · App. 10/877,799 · Granted Sep 8, 2009

Process of making cellulose acetate tow

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Quick Facts
Patent No.
US 7,585,441
App. No.
10/877,799
Granted
Sep 8, 2009
Kind
B2
Abstract

In the manufacture of a fiber tow, particularly cellulose acetate tow, the tow is plasticized prior to entry into the crimper. The preferred plasticizer is water.

Claims (21)

1. A process for making a cellulose acetate tow comprising the steps of:

spinning a dope comprising a solution of cellulose acetate and solvent,

taking-up the as-spun cellulose acetate filaments,

lubricating the cellulose acetate filaments,

forming a tow from the cellulose acetate filaments,

plasticizing the tow with a plasticizer consisting of water,

crimping the tow after plasticizing the tow,

drying the crimped tow, and

baling the dried crimped tow.

2. The process of claim 1 wherein the water being de-mineralized water.

3. The process of claim 1 wherein plasticizing the tow being preformed at least one half meter before the tow enters a crimper.

4. The process of claim 1 wherein plasticizing the tow being preformed at least one meter before the tow enters a crimper.

5. The process of claim 1 wherein plasticizing the tow further comprises an application rate of less than 300 cc/mm at line speeds of 200-1,000 meters per minute for a tow of 10,000 to 100,000 total denier.

6. The process of claim 1 wherein plasticizing the tow further comprises an application rate ranging from 25 to 200 cc/mm at line speeds of 200 - 1,000 meters per minute for a tow of 10,000 to 100,000 total denier.

7. The process of claim 1 wherein plasticizing the tow further comprising using a spool-type guide.

8. The process of claim 1 wherein plasticizing the tow further comprising using a pair of spool-type guides.

9. The process of claims 7 or 8 wherein the spool-type guide having a hole through which a plasticizer is dispensed.

10. The process of claims 7 or 8 wherein the spool-type guide having a tow contacting surface being flat or curved.

11. The process of claim 10 wherein the curved surface being concave, convex, wavy, or concaved/convexed.

12. The process of claims 7 or 8 wherein the spool-type guide being flanged or flangeless.

13. The process of claims 7 or 8 wherein the spool-type guide being ceramic or ceramic coated.

Assignments (6)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 14, 2017
From: CELANESE ACETATE LLC
To: ACETATE INTERNATIONAL LLC
Reel/Frame 044869/0827 →
RELEASE OF SECURITY INTEREST Recorded Aug 18, 2016
From: DEUTSCHE BANK AG, NEW YORK BRANCH
To: CELANESE ACETATE LLC
Reel/Frame 039472/0805 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 3, 2008
From: CELANESE ACETATE LLC
To: DEUTSCHE BANK AG, NEW YORK BRANCH, AS COLLATERAL AGENT
Reel/Frame 020753/0559 →
PATENT RELEASE Recorded Mar 21, 2008
From: DEUTSCHE BANK AG, NEW YORK BRANCH
To: CELANESE ACETATE LLC
Reel/Frame 020687/0161 →
ASSIGNMENT OF SECURITY INTEREST Recorded Apr 25, 2005
From: CELANESE ACETATE LLC
To: DEUTSCHE BANK AG. NEW YORK BRANCH, AS COLLATERAL AGENT
Reel/Frame 016149/0833 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 18, 2004
From: CAENEN, PHILIP I.L.; SANDERSON, WILLIAM S.
To: CELANESE ACETATE, LLC
Reel/Frame 015997/0964 →