# US 5,352,511 A · Hydrophilic compositions with increased thermal resistance

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- Number: US 5,352,511 A
- Document ID: US5352511A
- Status: Granted
- Kind: A
- Application number: 08/153,339
- Filed: 1993-11-15
- Granted: 1994-10-04
- Earliest claimed: 1993-11-15
- Assignees: W. L. Gore & Associates, Onc.
- Inventors: Dilip R. Abayasekara; Robert L. Henn
- Web page: https://patentgrep.com/patent/US5352511A

## CPC

- B01D 67/0088: {Physical treatment with compounds, e.g. swelling, coating or impregnation}
- B01D 39/083: {of organic material}
- C08F 8/00: Chemical modification by after-treatment (graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C)
- D06N 3/047: {with fluoropolymers}
- B01D 2239/0421: Rendering the filter material hydrophilic
- B01D 2239/0471: Surface coating material
- B01D 2239/1208: Porosity
- C08F 2810/20: leading to a crosslinking, either explicitly or inherently
- Y10T 428/249958: Void-containing component is synthetic resin or natural rubbers
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- Y10T 428/31544: Addition polymer is perhalogenated
- 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)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- D06N: WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A fluid filtration material made of a porous substrate, e.g. a membrane or a fabric, that is coated with a fluorinated copolymer that contains recurring vinyl alcohol units that have been reacted with a monoepoxide to aid in preventing loss of hydrophilicity in the coated material.

## Claims

### Claim 1

A hydrophilic, fluid permeable composition comprising a substrate having continuous pores through it in which at least a portion of the interior of the substrate is coated with a copolymer of a fluorinated ethylenically unsaturated monomer and vinyl alcohol, wherein the vinyl alcohol units have been reacted with a monofunctional epoxide.

### Claim 2 (depends on 1)

The composition of claim 1 in which the substrate is flexible and is in the form of a fabric, sheet, film, tube, mesh or plug.

### Claim 3 (depends on 2)

The composition of claim 2 in which the substrate is comprised of a synthetic polymer or natural polymer.

### Claim 4 (depends on 1)

The composition of claim 1 in which the substrate is comprised of a fluoropolymer.

### Claim 5 (depends on 4)

The composition of claim 4 in which the fluoropolymer is polytetrafluoroethylene.

### Claim 6 (depends on 1)

The composition of claim 1 in which the fluorinated ethylenically unsaturated monomer in the copolymer is tetrafluoroethylene.

### Claim 7 (depends on 1)

The composition of claim 1 wherein the monoepoxide is selected from the class consisting of glycidyl isopropyl ether, t-butyl glycidyl ether, 1-oxaspiro(2.5)octane, and styrene oxide.

### Claim 8 (depends on 1)

The composition of claim 1 wherein the monoepoxide is 1-oxaspiro(2.5) octane.