# US 2025/0144577 A1 · Thermal conductive and breathable membrane

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- Number: US 2025/0144577 A1
- Document ID: US20250144577A1
- Status: Published application
- Kind: A1
- Application number: 18/501,426
- Filed: 2023-11-03
- Published: 2025-05-08
- Earliest claimed: 2023-11-03
- Assignees: UC Bacon Company Limited
- Applicants: UC Bacon Company Limited
- Inventors: Ting Yu WU; Shan LI
- Web page: https://patentgrep.com/patent/US20250144577A1

## CPC

- B01D 71/54: Polyureas; Polyurethanes
- B01D 69/02: characterised by their properties
- B01D 69/148: {Organic/inorganic mixed matrix membranes}
- B01D 71/0211: {Graphene or derivates thereof}
- B01D 71/76: Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 (rubbers in general B01D71/24)
- B01D 2323/30: Cross-linking
- B01D 2325/04: Characteristic thickness
- B01D 2325/22: Thermal or heat-resistance properties
- B01D 2325/24: Mechanical properties, e.g. strength
- B01D 2325/26: Electrical properties
- B01D 2325/34: Molecular weight or degree of polymerisation
- 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)

## Abstract

A thermally conductive and breathable membrane that oligo-layer graphene with a solid weight ratio of 1˜30 wt % and a polyrotaxane with a solid weight content of 0.05 to 10 wt % relative to the thermal conductive and breathable membrane to a polyurethane resin, in addition to the moisture permeability and waterproofness of polyurethane resin, the oligo-layer graphene also increase the thermal conductivity, and the dispersibility of oligo-layer graphene is improved by adding polyrotaxane and the extensibility of polyurethane resin is improved, making the formed thermal conductive and breathable membrane enable to maintain extensibility without increasing the membrane thickness.

## Claims

### Claim 1

A thermal conductive and breathable membrane, which adds an oligo-layer graphene with a solid weight ratio of 1˜30 wt % and a polyrotaxane with a solid weight content of 0.05 to 10 wt % relative to the thermal conductive and breathable membrane to a polyurethane resin, in addition to the moisture permeability and waterproofness of polyurethane resin, the oligo-layer graphene also increase the thermal conductivity, and the dispersibility of oligo-layer graphene is improved by adding polyrotaxane and the extensibility of polyurethane resin is improved, making the formed thermal conductive and breathable membrane enable to maintain extensibility without increasing the membrane thickness.

### Claim 2 (depends on 1)

The thermal conductive and breathable membrane as claimed in claim 1, wherein the formed thermal conductive and breathable membrane has characteristics listed below, the thickness is between 15˜40 μm, the basis weight range is between 20 gsm˜50 gsm, the thermal conductivity coefficient in the plane direction≥1 W/mK, the thermal conductivity coefficient in the vertical direction≤0.5 W/mK, the moisture permeability measured according to JIS L1099-2012B-1 standard is at least 2000 g/m2/24 h, the water pressure resistance value measured according to JIS L1092B-2009 standard is at least 5000 mmH2O, the visible light transmittance<0.5%, the infrared and ultraviolet blocking rate>99.5%.

### Claim 3 (depends on 1)

The thermal conductive and breathable membrane as claimed in claim 1, wherein is also added with silica with a solid weight ratio of 0.1 to 5 wt % to prevent sticking, and a crosslinking agent is added to achieve crosslinking effect.

### Claim 4 (depends on 3)

The thermal conductive and breathable membrane as claimed in claim 3, wherein the preferred solid weight ratio of the oligo-layer graphene is 5˜10 wt %, the preferred solid weight ratio of the polyrotaxane is 0.1˜5 wt %, the preferred solid weight ratio of the silica is 2˜3 wt %.

### Claim 5 (depends on 1)

The thermal conductive and breathable membrane as claimed in claim 1, wherein the moisture permeability of the polyurethane resin measured according to JIS L1099-2012B-1 standard is at least 10000 g/m2/24 h, the average molecular weight of the polyrotaxane is between 100,000 and 500,000, at least 95% of the oligo-layer graphene has a lateral size of 6000˜8000 nm and thickness of 2˜3 nm, and the oxygen content of oligo-layer graphene is at least less than 0.1%.

### Claim 6 (depends on 3)

The thermal conductive and breathable membrane as claimed in claim 3, wherein the polyrotaxanes include compounds of the linear chain polymers and the cyclic molecules; the linear chain polymers serve as the axis molecules in the compounds and have a molecular weight of more than 10,000 and can be chemically modified by endcapping groups; the cyclic molecules allow the linear chain molecules to pass through, and having at least one reactive group capable of producing a crosslinking reaction with the reactive groups in the polyurethane resin or the crosslinking agent.

### Claim 7 (depends on 6)

The thermal conductive and breathable membrane as claimed in claim 6, wherein the main chain polymer of the linear chain polymer includes the copolymers of polyvinyl alcohol, polyvinylpyrrole, polyethylene glycol, polypropylene glycol, polyvinyl acetal resin, polydimethylsiloxane, polyamine, polyethyleneimine, polyolefin, polyester, polyvinyl chloride, polystyrene, acrylonitrile-styrene or derivatives thereof; the endcapping groups includes a dinitrophenyl group, an adamantyl group or a trityl group; the cyclic molecule includes a calixarene compound, a cryptether compound, a cyclic aromatic compound, a macrocyclic amine compound, a crown ether compound or a cyclodextrin compound.

### Claim 8 (depends on 7)

The thermal conductive and breathable membrane as claimed in claim 7, wherein the linear chain polymers are the linear chain polymers based on polyethylene glycol; the cyclic molecules are the cyclodextrin, substituted cyclodextrin, or a reactive groups are further added into the substitution structure to obtain a substituted cyclodextrin compound.

### Claim 9 (depends on 8)

The thermal conductive and breathable membrane as claimed in claim 8, wherein the reactive groups added into the cyclic molecules includes hydroxy, carboxyl, acrylic, methacrylic, epoxy or vinyl.

### Claim 10 (depends on 6)

The thermal conductive and breathable membrane as claimed in claim 6, wherein the reactive groups in polyurethane resin include carbonyl groups, amine groups, hydroxyl groups and epoxy groups; crosslinking agents are ester polymer compounds containing isocyanate reactive groups, including the polymers or copolymers or derivatives of toluene diisocyanate, diphenylmethane diisocyanate isocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, xylylene diisocyanate, tetramethylisoxylylene diisocyanate, etc., and the content of isocyanate reactive groups ranges from 5 to 25%.