CA2543386A1 - Aerogel/ptfe composite insulating material - Google Patents

Aerogel/ptfe composite insulating material Download PDF

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Publication number
CA2543386A1
CA2543386A1 CA 2543386 CA2543386A CA2543386A1 CA 2543386 A1 CA2543386 A1 CA 2543386A1 CA 2543386 CA2543386 CA 2543386 CA 2543386 A CA2543386 A CA 2543386A CA 2543386 A1 CA2543386 A1 CA 2543386A1
Authority
CA
Canada
Prior art keywords
layers
equal
aerogel
thermal conductivity
insulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2543386
Other languages
French (fr)
Other versions
CA2543386C (en
Inventor
Cedomila Ristic-Lehmann
Brian Farnworth
Anit Dutta
Bradley E. Reis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gore Enterprise Holdings Inc
Original Assignee
Gore Enterprise Holdings, Inc.
Cedomila Ristic-Lehmann
Brian Farnworth
Anit Dutta
Bradley E. Reis
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gore Enterprise Holdings, Inc., Cedomila Ristic-Lehmann, Brian Farnworth, Anit Dutta, Bradley E. Reis filed Critical Gore Enterprise Holdings, Inc.
Priority to CA2733298A priority Critical patent/CA2733298C/en
Publication of CA2543386A1 publication Critical patent/CA2543386A1/en
Application granted granted Critical
Publication of CA2543386C publication Critical patent/CA2543386C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D19/00—Gloves
    • A41D19/015—Protective gloves
    • A41D19/01529—Protective gloves with thermal or fire protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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    • C—CHEMISTRY; METALLURGY
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2327/00—Polyvinylhalogenides
    • B32B2327/12—Polyvinylhalogenides containing fluorine
    • B32B2327/18—PTFE, i.e. polytetrafluoroethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2270/00—Thermal insulation; Thermal decoupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
    • H01L23/433—Auxiliary members in containers characterised by their shape, e.g. pistons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
    • H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0313—Organic insulating material
    • H05K1/032—Organic insulating material consisting of one material
    • H05K1/034—Organic insulating material consisting of one material containing halogen
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0313—Organic insulating material
    • H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
    • H05K1/0373—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement containing additives, e.g. fillers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • Y10T428/31544—Addition polymer is perhalogenated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Abstract

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding or filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Claims (98)

1. A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder wherein the material has a thermal conductivity of less than or equal to 25 mW/m K at atmosph eric conditions.
2. The material of claim 1 wherein the material has a thermal conductivity of less than or equal to about 20 mW/m K at atmospheric conditions.
3. The material of claim 1 wherein the material has a thermal conductivity of less than or equal to about 17 mW/m K at atmospheric conditions.
4. The material of claim 1 wherein the aerogel has an average pore size less than or equal to about 100 nm.
5. The material of claim 1 wherein the aerogel is present in an amount of greater than or equal to about 40 % wt.
6. The material of claim 1 wherein the aerogel is present in an amount of greater than or equal to about 60 % wt.
7. The material of claim 1 wherein the aerogel is present in an amount of greater than or equal to about 80 % wt.
8. The material of claim 1 wherein the aerogel is formed from an inorganic oxide.
9. The material of claim 1 where the aerogel is silica aerogel.
10. The material of claim 1 wherein the material is formed from polytetrafluoroethylene (PTFE) particles having a particle size of about 50 nm to about 600 µm.
11. The material of claim 1 further comprising at least one additional component selected from opacifiers, dies, fibers and polymers.
12. The material of claim 11 wherein the opacifier is carbon black, titanium dioxide, iron oxides, silicon carbide, molybdenum silicide, manganese oxide or polydialkylsiloxanes, wherein the alkyl groups contain 1 to 4 carbon atoms.
13. The material of claim 1 wherein the material is a powder.
14. The material of claim 1 wherein the material is formable or moldable.
15. The material of claim 1 wherein the material is a putty.
16. The material of claim 1 wherein the material is between two walls of a double walled container.
17. The material of claim 1 wherein the material is a tape.
18. A structure comprising two layers and a material bonded between the two layers, wherein the material comprises aerogel particles and a polytetrafluoroethylene (PTFE) binder.
19. The structure of claim 18 wherein at least one of the layers is impermeable to liquids.
20. The structure of claim 18 wherein at least one of the layers is impermeable to gases.
21. The structure of claim 19, wherein at least one of layers is selected from metal foils and metallized polymer films.
22. The structure of claim 20, wherein at least one of layers is selected from metal foils and metallized polymer films.
23. The structure of claim 19, wherein at least one of the layers is aluminum or copper.
24. The structure of claim 20, wherein at least one of the layers is aluminum or copper.
25. The structure of claim 19, wherein the impermeable layers are comprised of expanded polytetrafluoroethylene (ePTFE).
26. The structure of claim 18 wherein at least one of the layers is permeable to gases.
27. The structure of claim 26, wherein at least one of the permeable layers is permeable to water vapor.
28. The structure of claim 27, wherein at least one of the permeable layers comprises expanded polytetrafluorethylene (ePTFE).
29. The structure of claim 26, wherein at least one of the permeable layers comprises continuous polymer film.
30. The structure of claim 29, wherein at least one of the permeable layers comprises polyurethane.
31. The structure of claim 18, wherein at least one of the layers is elastomeric.
32. The structure of claim 31, wherein at least one of the layers is a thermoplastic elastomer.
33. The structure of claim 32, wherein at least one of the layers comprises polyurethane, polyesters, polyamides and copolymers thereof.
34. The structure of claim 18 wherein the insulating material has a thermal conductivity of less than or equal to about 25 mW/m K at atmospheric conditions.
35. The structure of claim 18 wherein the insulating material has a thermal conductivity of less than or equal to about 20 mW/m k at atmospheric conditions.
36. The structure of claim 18 wherein the material has a thermal conductivity of less than or equal to about 17 mW/m K at atmospheric conditions.
37. The structure of claim 18 wherein the aerogel is formed from an inorganic oxide.
38. The structure of claim 37 wherein the aerogel is silica aerogel.
39. The structure of claim 18 wherein the aerogel comprises greater than or equal to about 40 % wt of the material.
40. The structure of claim 18 wherein the material further comprises at least one additional component.
41. The structure of claim 18 wherein the material further comprises an opacifier.
42. The structure of claim 18 wherein the material is bonded between two layers with a non-adhesive bonding.
43. The structure of claim 18 wherein the material is bonded between two layers with an adhesive.
44. The structure of claim 18 wherein the structure is formed as a tape.
45. The structure of claim 18 wherein the structure may be flexed or wrapped without a substantial change in thermal conductivity.
46. The structure of claim 18 wherein the structure is wrapped around a pipe to form an insulated pipe.
47. The structure of claim 18 wherein the structure is an insert for use in apparel.
48. The structure of claim 18 wherein the structure is an insert for use in footwear.
49. The structure of claim 18 wherein the structure is an insert for use in gloves.
50. The structure of claim 18, wherein the structure has a thickness of greater than or equal to about 0.5 mm.
51. An article comprising at least two surfaces and an insulating material between at least two surfaces, wherein the insulating material comprises aerogel particles and interconnected polytetrafluoroethylene (PTFE) fibrils, the insulating material having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions.
52. The insulating structure of claim 51, wherein the insulating material is a putty.
53. The insulated article of claim 51 wherein at least one surface is rigid.
54. The insulated article of claim 51 wherein at least one surface is flexible.
55. The insulating article of claim 51 wherein the surfaces are non-porous.
56. The insulated articles of claim 51 wherein the surfaces are two walls of a double-walled pipe.
57. The insulated article of claim 51, wherein the surfaces are two walls of a double-walled container.
58. A method of forming a structure comprising providing two layers, and providing an insulating material between the two layers, wherein the insulating material comprises aerogel particles and a polytetrafluoroethylene (PTFE) binder, and wherein the insulating material has a thermal conductivity of less than or equal to 25 mW/ m K at atmospheric conditions.
59. The method of claim 58 further comprising the steps of sealing at least three sides of the structure, applying a vacuum to the structure, and sealing a fourth side of the structure to reduce the pressure to below atmospheric pressure.
60. The method of claim 58 wherein the structure is a tape.
61. A material comprising aerogel particles and interconnected polytetrafluoroethylene (PTFE) fibrils, wherein the material has a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions.
62. The material of claim 61 wherein the interconnected fibrils are interconnected to other polytetrafluoroethylene fibrils or particles.
63. The material of claim 62 wherein the aerogel particles are situated within or around the interconnected fibrils.
64. The material of claim 61 wherein the material has a thermal conductivity of less than or equal to about 20 mW/m K at atmospheric conditions.
65. The material of claim 61 wherein the material has a thermal conductivity of less than or equal to about 17 mW/m K at atmospheric conditions.
66. The material of claim 61 wherein the aerogel is present in an amount of greater than or equal to about 40 % wt.
67. The material of claim 61 wherein the aerogel is present in an amount of greater than or equal to about 60 % wt.
68. The material of claim 61 wherein the aerogel is present in an amount of greater than or equal to about 80 % wt.
69. The material of claim 61 where the aerogel is silica.
70. The material of claim 61 further comprising at least one additional component selected from opacifiers, dies, fibers and polymers.
71. The material of claim 61, wherein the material forms a core material between two layers to form a composite structure.
72. The structure of claim 71 wherein at least one of the layers is impermeable to liquids.
73. The structure of claim 71 wherein at least one of the layers is impermeable to gases.
74. The structure of claim 72, wherein at least one of layers is selected from metal foils and metallized polymer films.
75. The structure of claim 73, wherein at least one of layers is selected from metal foils and metallized polymer films.
76. The structure of claim 74, wherein at least one of the layers is aluminum or copper.
77. The structure of claim 75, wherein at least one of the layers is aluminum or copper.
78. The structure of claim 72, wherein the impermeable layers are comprised of expanded polytetrafluoroethylene (ePTFE).
79. The structure of claim 71 wherein at least one of the layers is permeable to gases.
80. The structure of claim 79, wherein at least one of the permeable layers is permeable to water vapor.
81. The structure of claim 80, wherein at least one of the permeable layers comprises expanded polytetrafluoroethylene (ePTFE).
82. The structure of claim 79, wherein at least one of the permeable layers comprises continuous polymer film.
83. The structure of claim 79, wherein at least one of the permeable layers comprises polyurethane.
84. The structure of claim 71, wherein at least one of the layers is elastomeric.
85. The structure of claim 84, wherein at least one of the layers is a thermoplastic elastomer.
86. The structure of claim 85, wherein at least one of the layers comprises polyurethane, polyesters, polyamides and copolymers thereof.
87. The material of claim 51, wherein the composite is under vacuum pressure between 0.001 Pa and 100 000Pa.
88. A portable electronic device comprising at least one heat generating component, an enclosure, and an insulating structure located between the heat generating component and the enclosure.
89. The device of claim 88 wherein the insulating structure has a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions.
90. The device of claim 89 wherein the insulating structure comprises an insulating material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder.
91. The device of claim 90 wherein the insulating material is a composite further comprising two additional layers.
92. The device of claim 88 wherein the enclosure has a surface and at least portion of the surface is designed to be in direct contact with a user.
93. The device of claim 88 wherein the device is a computer.
94. The device of claim 88 wherein the device is a cellular phone.
95. The device of claim 91 wherein the two layers are expanded polytetrafluoroethylene (ePTFE).
96. A method comprising the steps of providing a portable electronic device having at least one heat generating component and an enclosure having a surface, and placing an insulating structure between the heat generating component and the enclosure, thereby preventing or delaying the transfer of heat generated from a heat generating component to at least a portion of the enclosure surface.
97. The method of claim 96 wherein the insulating structure comprises a material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder, the material having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions.
98. The method of claim 96 wherein at least part of the enclosure surface is designed to be in direct contact with a user.
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US10/706,777 US7118801B2 (en) 2003-11-10 2003-11-10 Aerogel/PTFE composite insulating material
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US20080131683A1 (en) 2008-06-05
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US7349215B2 (en) 2008-03-25

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