# US 11,299,854 B2 · Paper product articles

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- Number: US 11,299,854 B2
- Document ID: US11299854B2
- Status: Granted
- Kind: B2
- Application number: 16/522,983
- Filed: 2019-07-26
- Published: 2020-02-27
- Granted: 2022-04-12
- Earliest claimed: 2018-08-23
- Assignees: Eastman Chemical Company
- Applicants: Eastman Chemical Company
- Inventors: Charles Stuart Everett; Melvin Glenn Mitchell; Kenny Randolph Parker; Koushik Ghosh; Mounir Izallalen
- Web page: https://patentgrep.com/patent/US11299854B2

## CPC

- D21H 13/06: Cellulose esters
- B01D 39/163: {sintered or bonded}
- D21H 15/04: crimped, kinked, curled or twisted fibres
- B01D 39/18: the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14)
- B01D 2239/0618: Non-woven
- B01D 2239/064: The fibres being mixed
- B01D 2239/086: Binders between particles or fibres
- B01D 2239/1216: Pore size
- B01D 2239/1225: Fibre length
- B01D 2239/1233: Fibre diameter
- B01D 2239/1258: Permeability
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

The present invention provides compositions comprising cellulose fibers and cellulose ester fibers and wet laid articles made from the compositions, as well as wet laid processes to produce these compositions. More specifically, the present invention provided compositions comprising cellulose fibers and cellulose acetate fibers and wet laid articles made from these compositions as well as wet laid processes to produce these compositions. The present invention also relates to developing a composition, process, wet laid product, or articles exhibiting any one of many the desired benefits. The Present invention also relates to a wet laid product having higher air permeability the same or lower pore size relative to a 100% cellulose comparative composition.

## Claims

### Claim 1

A paper article comprising cellulose fiber and a staple fiber wherein said staple fiber comprises cellulose acetate; wherein said paper article has a higher air permeability for a given pore size versus a 100% cellulose comparative composition; wherein said staple fiber have a denier per filament (DPF) of 1.8 to less than 3; wherein said staple fibers are present in an amount from about 4 wt % to less than 16 wt %; wherein at least a portion of said staple fibers are combined with said cellulose fibers and co-refined; and wherein said staple fibers have:
i) a cut length of less than 6 mm, and
crimping
iii).

### Claim 2 (depends on 1)

The article according to claim 1 wherein said staple fiber is in an amount of about 4 to about 15 wt %.

### Claim 3 (depends on 1)

The article according to claim 1 wherein said staple fiber is in an amount of about 4 to about 5 wt %.

### Claim 4 (depends on 1)

The article according to claim 1 wherein said staple fiber is in an amount of about 4 to about 10 wt %.

### Claim 5 (depends on 1)

The article according to claim 1 wherein said staple fiber is in an amount of about 4 to about 6 wt %.

### Claim 6 (depends on 1)

The article according to claim 1 where said cellulose acetate has a degree of substitution of less than 2.5.

### Claim 7 (depends on 1)

The article according to claim 1 where said cellulose acetate has a degree of substitution of less than 2.4.

### Claim 8 (depends on 1)

The article according to claim 1 wherein said article is compostable.

### Claim 9 (depends on 1)

The article according to claim 1, wherein said staple fiber has an average denier per filament of from 2.0 to less than 3.0.

### Claim 10 (depends on 1)

The article according to claim 1, wherein said staple fiber has a crenulated cross-sectional shape.

### Claim 11 (depends on 1)

The article according to claim 1, wherein said crimped staple fiber has an average of 5 CPI or more.