# US 12,179,175 B2 · Polymer compositions comprising active carbon for formaldehyde sorption

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- Number: US 12,179,175 B2
- Document ID: US12179175B2
- Status: Granted
- Kind: B2
- Application number: 17/594,463
- Filed: 2020-04-15
- Published: 2022-05-26
- Granted: 2024-12-31
- Earliest claimed: 2019-04-17
- Assignees: CSP Technologies, Inc.
- Applicants: Csp Technologies, Inc.
- Inventors: Craig Voellmicke; Jason Pratt; James S. Hollinger
- Web page: https://patentgrep.com/patent/US12179175B2

## CPC

- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01J 20/28026: {Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin}
- B01D 53/72: Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
- B01D 53/82: with stationary reactants
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- B01J 20/226: {Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF] (preparation of metal complexes containing carboxylic acid moieties C07C51/418; MOF's per se C07F)}
- B01J 20/261: {obtained by reactions only involving carbon to carbon unsaturated bonds (macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds per se C08F)}
- B01J 20/28042: {Shaped bodies; Monolithic structures}
- B01J 20/28057: {Surface area, e.g. B.E.T specific surface area}
- B01J 20/3007: {Moulding, shaping or extruding}
- B01J 20/3085: {Chemical treatments not covered by groups B01J20/3007 - B01J20/3078}
- B01J 20/3092: {Packing of a container, e.g. packing a cartridge or column (of chromatography columns B01D15/206)}
- B01D 2253/102: Carbon
- B01D 2253/202: Polymeric adsorbents
- B01D 2253/25: Coated, impregnated or composite adsorbents
- B01D 2253/34: Specific shapes
- B01D 2253/342: Monoliths
- B01D 2257/70: Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01D 2258/06: Polluted air
- B01J 2220/46: Materials comprising a mixture of inorganic and organic materials (materials coated or impregnated on a carrier B01J20/32)
- B01J 2220/4825: Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
- 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

Disclosed are polymer compositions comprising activated carbon and method of making the polymer compositions that are used for sorption of formaldehyde from air, gas or liquids. The activated carbon is entrained in at least one base polymer with optional channels throughout.

## Claims

### Claim 1

A process for reducing the amount of volatile organic compound in a closed chamber or container comprising the steps of:
(1) enclosing an entrained polymer composition within the chamber or container, the entrained polymer composition being a monolithic material comprising:
(a) from 20 to 70% by weight of a base polymer selected from polypropylene, polyethylene, polyisoprene, polyhydroxyalkanoates (PHAs), polylactic acid (PLA), polybutylene succinate (PBS), polyhexene, polybutadiene, polybutene, polysiloxane, polycarbonate, polyamide, ethylene-vinyl acetate copolymer, ethylene-methacrylate copolymer, polyvinyl chloride (PVC), polystyrene, polyester, polyanhydride, polyacrylonitrile, polysulfone, polyacrylic ester, acrylic, polyurethane, polyacetal, polyvinylpyrrolidone (PVP), a copolymer, or a combination thereof;
(b) from 20 to 70% by weight of activated carbon, wherein the activated carbon is tris(hydroxymethyl)aminomethane impregnated carbon; and
(c) from 2 to 15% by weight of a channeling agent that is defined as a polymer material that is immiscible with the base polymer and has an affinity to transport a gas phase substance at a faster rate than the base polymer alone, wherein the channeling agent is selected from polyethylene glycol (PEG), ethylene-vinyl alcohol (EVOH), polyvinyl alcohol (PVOH), glycerin polyamine, polyurethane, polycarboxylic acid, propylene oxide polymerisate-monobutyl ether, propylene oxide polymerisate, ethylene vinyl acetate, nylon 6, nylon 66, or a combination thereof,
wherein the % by weight are based on the total weight of the entrained polymer composition, and
wherein the activated carbon and the channeling agent are distributed throughout the entrained polymer; and
(2) allowing the entrained polymer composition in the chamber or container to reduce the amount of the volatile organic compound.

### Claim 2 (depends on 1)

The process of claim 1, wherein the base polymer is polypropylene or polyethylene and the channeling agent is polyethylene glycol.

### Claim 3 (depends on 1)

The process of claim 1, wherein the distribution of activated carbon within the base polymer of the entrained polymer composition is homogeneous.

### Claim 4 (depends on 1)

The process of claim 1, wherein the volatile organic compound is formaldehyde.

### Claim 5 (depends on 1)

The process of claim 1, further comprising placing a volatile organic compound releasing object that is a pharmaceutical product into the chamber or container, wherein the polymer composition reduces the amount of volatile organic compound released by the object.

### Claim 6 (depends on 1)

The process of claim 1, wherein the entrained polymer is provided as a film.

### Claim 7 (depends on 6)

The process of claim 6, wherein the volatile organic compound is formaldehyde.

### Claim 8 (depends on 5)

The process of claim 5, wherein the polymer composition does not physically contact the volatile organic compound releasing object.

### Claim 9 (depends on 8)

The process of claim 8, wherein the film has a thickness of from 0.1 mm to 1.0 mm.

### Claim 10 (depends on 8)

The process of claim 8, further comprising providing the film in a blister pack.

### Claim 11 (depends on 10)

The process of claim 10, wherein the blister pack comprises:
a backing;
a cover attached to the backing; and
at least one cavity formed by a combination of the backing and the cover.

### Claim 12 (depends on 11)

The process of claim 11, wherein the film is adhered to the backing.

### Claim 13 (depends on 11)

The process of claim 11, wherein the film is disposed in the at least one cavity.

### Claim 14 (depends on 11)

The process of claim 11, further comprising a pharmaceutical product in the at least one cavity, the pharmaceutical product emitting the volatile organic compound, the film being effective to reduce the volatile organic compound within the at least one cavity.