# US 2014/0190353 A1 · Filter media with improved conductivity

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- Number: US 2014/0190353 A1
- Document ID: US20140190353A1
- Status: Published application
- Kind: A1
- Application number: 14/154,307
- Filed: 2014-01-14
- Published: 2014-07-10
- Earliest claimed: 2005-08-03
- Assignees: Hollingsworth & Vose Company
- Applicants: Hollingsworth & Vose Company
- Inventors: Wai Ming Choi; Karin N. Soper
- Web page: https://patentgrep.com/patent/US20140190353A1

## CPC

- B01D 39/14: Other self-supporting filtering material {; Other filtering material (non-woven fabrics in general D04H3/00)}
- B01D 29/016: {with corrugated, folded or wound filtering elements}
- B01D 37/00: Processes of filtration (processes specially adapted for filtering gases B01D46/00)
- B01D 39/1607: {the material being fibrous (B01D39/18 takes precedence)}
- B01D 39/1615: {of natural origin}
- B01D 39/1692: {Other shaped material, e.g. perforated or porous sheets}
- B01D 39/2017: {the material being filamentary or fibrous}
- B01D 39/2041: {the material being filamentary or fibrous}
- B01D 39/2062: {Bonded, e.g. activated carbon blocks}
- B01D 39/2065: {the material being fibrous}
- B01D 39/2082: {the material being filamentary or fibrous}
- B01D 46/521: {using folded, pleated material}
- B03C 3/155: Filtration
- B01D 2239/0241: comprising electrically conductive fibres or particles
- B01D 2239/0478: on a layer of the filter
- B01D 2239/0618: Non-woven
- B01D 2239/0622: Melt-blown
- B01D 2239/0627: Spun-bonded
- B01D 2239/065: More than one layer present in the filtering material
- B01D 2239/0668: The layers being joined by heat or melt-bonding
- B01D 2239/0672: The layers being joined by welding
- B01D 2239/0681: The layers being joined by gluing
- B01D 2239/083: Binders between layers of the filter
- B01D 2239/086: Binders between particles or fibres
- B01D 2239/10: Filtering material manufacturing
- B01D 2239/1208: Porosity
- B01D 2239/1225: Fibre length
- B01D 2239/1233: Fibre diameter
- B01D 2239/1241: Particle diameter
- B01D 2239/125: Size distribution
- B01D 2239/1258: Permeability
- B01D 2239/1275: Stiffness
- B01D 2239/1291: Other parameters
- Y10T 29/49002: Electrical device making
- 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)
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Filter media are provided having improved conductivity to enhance filtration efficiency and/or dissipate static charge, and methods for making the same. In one exemplary embodiment, the filter media can include a filtration substrate, and at least one conductive coating disposed on at least a portion of the filtration substrate. In use, the conductive coating is coupled to an energy source and it is effective to emit ions when energy is delivered thereto to increase the efficiency of the filtration substrate and/or to dissipate or eliminate static charge generated during filtration.

## Claims

### Claim 1

A filter media, comprising:
a filtration substrate; and
at least one conductive coating disposed on at least a portion of the filtration substrate, wherein the conductive coating comprises carbon particles.

### Claim 2 (depends on 1)

The filter media of claim 1, wherein the filter media has a surface resistivity in the range of about 1×102 to 1×1012 ohms2.

### Claim 3 (depends on 1)

The filter media of claim 1, wherein the filter media has surface resistivity of less than about 1×107 ohms2.

### Claim 4 (depends on 1)

The filter media of claim 1, wherein the filter media is formed from multiple filtration layers.

### Claim 5 (depends on 1)

The filter media of claim 1, wherein the filtration substrate is formed from fibers selected from the group consisting of natural fibers, organic fibers, inorganic fibers, and combinations thereof.

### Claim 6 (depends on 1)

The filter media of claim 1, wherein the filtration substrate is formed from fibers selected from the group consisting of glass fibers, ceramic fibers, polymer fibers, cotton fibers, hemp fibers, carbon fibers, and combinations thereof.

### Claim 7 (depends on 1)

The filter media of claim 1, further comprising a bonding agent bonding the conductive coating to the filtration substrate.

### Claim 8 (depends on 7)

The filter media of claim 7, wherein the bonding agent is formed from a polymer selected from the group consisting of polyvinylidene chloride, acrylic lattices, polyurethane dispersion, polyvinyl acetate, and polyvinyl alcohol.

### Claim 9 (depends on 7)

The filter media of claim 7, wherein the bonding agent is conductive.

### Claim 10 (depends on 1)

The filter media of claim 1, wherein the filter media is pleated.

### Claim 11 (depends on 1)

The filter media of claim 1, wherein the conductive coating coats all of the filtration substrate.

### Claim 12 (depends on 1)

The filter media of claim 1, further comprising coupling mechanism for connecting a high voltage power source to the conductive coating.

### Claim 13 (depends on 1)

The filter media of claim 1, wherein the conductive coating is adapted to emit ions when energy is delivered thereto to increase an efficiency of the filter media.

### Claim 14 (depends on 1)

The filter media of claim 1, wherein the filtration substrate is formed from glass fibers.

### Claim 15 (depends on 1)

The filter media of claim 1, wherein the filtration substrate includes a first surface and a second surface, and the at least one conductive coating coats only one surface of the filtration substrate.

### Claim 16 (depends on 1)

The filter media of claim 1, wherein the filtration substrate includes a first surface and a second surface, and the at least one conductive coating coats both surfaces of the filtration substrate.

### Claim 17 (depends on 1)

The filter media of claim 1, wherein the filtration substrate comprises a non-woven web.

### Claim 18 (depends on 1)

The filter media of claim 1, wherein the filter media is at least one of a HEPA filter media, an ULPA filter media, an ASHRAE filter media, a fuel filter media, and a hydraulic filter media.

### Claim 19 (depends on 1)

A filter element comprising the filter media of claim 1.

### Claim 20

A method, comprising:
passing a fluid across a filter media comprising:
a filtration substrate; and
at least one conductive coating disposed on at least a portion of the filtration substrate, wherein the conductive coating comprises carbon particles.