# US 11,998,073 B2 · Non-woven protective clothing against blood and viruses

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- Number: US 11,998,073 B2
- Document ID: US11998073B2
- Status: Granted
- Kind: B2
- Application number: 17/476,154
- Filed: 2021-09-15
- Published: 2023-02-09
- Granted: 2024-06-04
- Earliest claimed: 2021-08-03
- Assignees: Web-Pro Corporation
- Applicants: Web-Pro Corporation
- Inventors: Fu-Chun Lin; Ping-Sen Liao; Ya-Tong Cai; Tsung-Chia Wang; Chiu-Ti Wang
- Web page: https://patentgrep.com/patent/US11998073B2

## CPC

- A41D 31/102: Waterproof and breathable
- A41D 31/305: {using layered materials}
- B32B 3/266: {characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12}
- B32B 5/022: {Non-woven fabric}
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- D04H 13/00: Other non-woven fabrics
- A41D 2500/30: Non-woven
- A62B 17/006: {against contamination from chemicals, toxic or hostile environments; ABC suits}
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 27/205: {the fillers creating voids or cavities, e.g. by stretching}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2262/0223: Vinyl resin fibres
- B32B 2262/023: Aromatic vinyl resin, e.g. styrenic (co)polymers
- B32B 2262/0253: Polyolefin fibres
- B32B 2262/0276: Polyester fibres
- B32B 2262/0292: Polyurethane fibres
- B32B 2262/04: Cellulosic plastic fibres, e.g. rayon
- B32B 2262/062: Cellulose fibres, e.g. cotton
- B32B 2262/16: Structural features of fibres, filaments or yarns e.g. wrapped, coiled, crimped or covered
- B32B 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2264/302: Average diameter in the range from 100 nm to 1000 nm
- B32B 2264/303: Average diameter greater than 1µm
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/7265: Non-permeable
- B32B 2437/00: Clothing
- B32B 2571/00: Protective equipment
- A41D: OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)

## Abstract

A non-woven protective clothing against blood and viruses is composed from a non-woven fabric layer, which has two surfaces; and a moisture-permeable layer, which is a porous film that is laminated to one of the surfaces of the non-woven fabric layer; and an elastic pore filling layer, which is a hydrophilic polyurethane. The elastic pore filling layer is coated or printed onto the surface of the moisture-permeable layer, and the thickness of the elastic pore filling layer is thinner than that of the moisture-permeable layer. The synthetic blood permeability of the non-woven protective clothing against blood and viruses can resist a pressure of 2.0 psi for one minute, and the Phi-X174 bacteriophage penetrability thereof can resist a pressure of 2.0 psi for one minute.

## Claims

### Claim 1

A non-woven protective clothing against blood and viruses, comprising:
a non-woven fabric layer, which has two surfaces, with a basis weight ≤70 g/m2; a moisture-permeable layer, which is a porous film, with a basis weight between 5˜30 g/m2; the percentage by weight of a powder in the moisture-permeable layer is 40˜70%, and the draw ratio thereof is ≤400%; moreover, the average grain diameters in the powder in the moisture-permeable layer are 0.5˜3 μm, and calcium carbonate (CaCO3) is used as the powder, and the moisture-permeable layer is laminated to one of the surfaces of the non-woven fabric layer;
an elastic pore filling layer, which is a hydrophilic polyurethane that is composed of at least a hydrophilic waterborne polyurethane and a hydrophilic solventborne polyurethane, wherein, the elastic pore filling layer is coated or printed onto the surface of the moisture-permeable layer, and the thickness of the elastic pore filling layer is thinner than that of the moisture-permeable layer; wherein a moisture permeability of the elastic pore filling layer is lower than a moisture permeability of the moisture-permeable layer;
wherein, the synthetic blood permeability of the non-woven protective clothing against blood and viruses being capable of resisting pressure of 2.0 psi for 1 minute, and the Phi-X174 bacteriophage penetrability thereof being capable of resisting pressure of 2.0 psi for 1 minute.

### Claim 2 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein after dispersing the powder, the moisture-permeable layer is a drawn porous polyethylene or polypropylene film.

### Claim 3 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the material for the non-woven fabric layer is a selected composition of a spunlace non-woven fabric, a needle-punched non-woven fabric, a spun-bonded non-woven fabric, or a melt-blown non-woven fabric.

### Claim 4 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the fiber diameters in the non-woven fabric layer are 0.5˜40 μm.

### Claim 5 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the fiber material in the non-woven fabric layer is at least a polyethylene, polypropylene, polyester, polyvinyl alcohol, rayon, cotton, polyurethane, or a styrene-ethylene and/or butylene-styrene copolymer.

### Claim 6 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the moisture-permeable layer is a three layer extruded film with a thickness layer ratio of 1:1:1, 1:2:1, 1:3:1, 1:4:1, or 1:5:1.

### Claim 7 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the thickness ratio of the moisture-permeable layer to the elastic pore filling layer is 16:1.5 to 16:3.

### Claim 8 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the moisture-permeable layer laminated to the non-woven fabric layer has a moisture permeability between 1500˜7500 g/m2/24 hr.

### Claim 9 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the non-woven fabric layer has a basis weight of 40˜70 g/m2 and the moisture permeability of the non-woven fabric layer reaches ≥1500 g/m2/24 hr.

### Claim 10 (depends on 1)

The non-woven protective clothing against blood and viruses according to claim 1, wherein the percentage by weight of the powder in the moisture-permeable layer is 40˜60%, and the moisture permeability of the moisture-permeable layer reaches ≥1500 g/m2/24 hr.