# US 11,109,619 B2 · Filter materials including functionalized cellulose

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- Number: US 11,109,619 B2
- Document ID: US11109619B2
- Status: Granted
- Kind: B2
- Application number: 14/915,923
- Filed: 2014-09-05
- Published: 2016-07-07
- Granted: 2021-09-07
- Earliest claimed: 2013-09-06
- Assignees: Massachusetts Institute of Technology
- Applicants: Massachusetts Institute of Technology
- Inventors: Timothy M. Swager; Jisun Im
- Web page: https://patentgrep.com/patent/US11109619B2

## CPC

- A24D 3/10: of cellulose or cellulose derivatives
- A24D 3/067: {characterised by functional properties}
- A24D 3/14: of organic materials as additive (of ion exchange materials A24D3/12)
- A24D 3/163: {Carbon}
- B01D 39/18: the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14)
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/04: with stationary adsorbents {(B01D53/025 takes precedence)}
- B01J 20/24: Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
- B01J 20/28023: {Fibres or filaments (fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence)}
- B01J 20/3212: {consisting of a polymer obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds}
- B01J 20/3217: {Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond}
- B01J 20/3246: {having a well defined chemical structure}
- B01J 20/3248: {the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such}
- B01J 20/3255: {comprising a cyclic structure containing at least one of the heteroatoms nitrogen, oxygen or sulfur, e.g. heterocyclic or heteroaromatic structures}
- B01J 20/3293: {Coatings on a core, the core being particle or fiber shaped, e.g. encapsulated particles, coated fibers}
- B01D 2239/0464: Impregnants
- B01D 2253/202: Polymeric adsorbents
- B01D 2257/7027: Aromatic hydrocarbons
- B01D 2258/06: Polluted air
- A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

Embodiments described herein provide materials and methods for the absorption or filtration of various species and analytes. In some cases, the materials may be used to remove or reduce the amount of a substance in vapor sample (e.g., cigarette smoke).

## Claims

### Claim 1

A filter material, comprising:
a fiber or network of fibers comprising a cellulose-based polymer comprising at least one binding site, the binding site comprising an aromatic group, wherein the cellulose-based polymer comprises the structure:
wherein:
R1 has a structure selected from the group consisting of:
R2 and R3 can be the same or different and are hydrogen, alkyl, aryl, a carbonyl group, any of which is optionally substituted; and
n is greater than 1.

### Claim 2 (depends on 1)

A filter material as in claim 1, wherein the cellulose-based polymer is substituted cellulose, substituted cellulose acetate, substituted cellulose diacetate, or substituted cellulose triacetate.

### Claim 3 (depends on 1)

A filter material as in claim 1, wherein the binding site is capable of binding an aromatic species.

### Claim 4 (depends on 1)

A filter material as in claim 1, wherein R2 and R3 can be the same or different and are hydrogen, —COCH3, or —F5Ph.