IP Library Granted Patent US 11,639,579
Granted Patent B2
US 11,639,579 · App. 16/522,973 · Granted May 2, 2023

Recycle pulp comprising cellulose acetate

Inventors: Kenny Randolph Parker (Afton, TN); Charles Stuart Everett (Kingsport, TN); Melvin Glenn Mitchell (Penrose, NC)
Assignee: Eastman Chemical Company
D21H15/10D21H11/14D21H11/20D21H15/04
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Quick Facts
Patent No.
US 11,639,579
App. No.
16/522,973
Granted
May 2, 2023
Kind
B2
Abstract

A recycled cellulose pulp composition is provided which comprises recycled cellulosic fibers and cellulose ester staple fibers. A wet-laid fibrous product is also provided which comprises recycled cellulosic fibers and cellulose ester staple fibers. A bailed article is also provided that comprises recycled cellulosic fibers and cellulose ester staple fibers. In embodiments, the recycled cellulosic fibers are present in an amount of 50 wt % or more, based on the total dry weight of fibers, and the cellulose ester staple fibers are present in an amount sufficient to increase the Canadian standard freeness (CSF) of the composition by 5% or more compared to a 100 wt % cellulosic fiber pulp composition processed under similar conditions.

Claims (6)

1. A baled article comprising recycled cellulosic fibers and cellulose ester staple fibers, wherein the recycled cellulosic fibers are present in an amount of 50 wt. % or more, based on the total dry weight of fibers in the article, and wherein the cellulose ester staple fibers are present in an amount sufficient to provide a furnish made from the article having a 5% or more increase in Canadian standard freeness (CSF) compared to a 100 wt. % cellulosic fiber furnish; wherein the cellulose ester staple fiber has an average denier per filament (DPF) of 1.5 to less than 3.0; wherein the cellulose ester staple fiber has an average cut length of less than 6 mm; wherein said cellulose ester staple fiber comprises cellulose acetate in an amount from about 4 to less than 16 wt %, and wherein the recycled cellulosic fibers and cellulose ester staple fibers have been co-refined.

2. The article according to claim 1 , wherein the article further comprises virgin cellulosic fibers.

3. The article according to claim 1 , wherein the 100 wt % cellulosic fiber furnish has a CSF of 300 ml or less.

4. The article according to claim 1 , wherein the 100 wt % cellulosic fiber furnish has a CSF of 250 ml or less.

5. The article according to claim 1 , wherein the cellulose ester staple fiber has a crenulated cross-sectional shape.

6. The article according to claim 1 , wherein the cellulose ester staple fiber has a multi-lobal cross-sectional shape.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 1, 2019
From: PARKER, KENNY RANDOLPH; EVERETT, CHARLES STUART; MITCHELL, MELVIN GLENN
To: EASTMAN CHEMICAL COMPANY
Reel/Frame 050585/0179 →
Continuity (2)
Provisional Application 62721830 · Aug 23, 2018
Related Publication 20200063366A1 · Feb 27, 2020
Cited By (1)
US 12,256,771