# US 2018/0023904 A1 · Graphite laminates, processes for producing graphite laminates, structural object for heat transport, and rod-shaped heat-transporting object

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- Number: US 2018/0023904 A1
- Document ID: US20180023904A1
- Status: Published application
- Kind: A1
- Application number: 15/536,381
- Filed: 2015-12-18
- Published: 2018-01-25
- Earliest claimed: 2014-12-18
- Assignees: Kaneka Corporation
- Applicants: Kaneka Corporation
- Inventors: Yusuke Kato; Makoto Kutsumizu; Yasushi Nishikawa; Keisuke Inaba; Michiyasu Sakagami
- Web page: https://patentgrep.com/patent/US20180023904A1

## CPC

- C01B 32/20: Graphite
- B32B 1/08: Tubular products
- B32B 3/26: characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer}
- 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 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 9/00: Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00
- B32B 9/007: {comprising carbon, e.g. graphite, composite carbon}
- B32B 9/04: comprising such {particular} substance as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00)}
- B32B 9/045: {of synthetic resin}
- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/281: {comprising polyimides}
- B32B 27/285: {comprising polyethers}
- B32B 27/286: {comprising polysulphones; polysulfides}
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/365: {comprising polycarbonates}
- B32B 27/38: comprising epoxy resins
- B32B 27/40: comprising polyurethanes
- B32B 27/42: comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
- C09J 7/00: Adhesives in the form of films or foils
- C09K 5/14: Solid materials, e.g. powdery or granular
- F28F 21/02: of carbon, e.g. graphite
- H05K 7/20445: {the coupling element being an additional piece, e.g. thermal standoff}
- H10W 40/22: characterised by their shape, e.g. having conical or cylindrical projections
- H10W 40/25: characterised by their materials
- B32B 2250/42: Alternating layers, e.g. ABAB(C), AABBAABB(C)
- B32B 2255/205: Metallic coating
- B32B 2255/26: Polymeric coating
- B32B 2255/28: Multiple coating on one surface
- B32B 2307/204: Di-electric
- B32B 2307/302: Conductive
- B32B 2307/538: Roughness
- B32B 2307/72: Density
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/732: Dimensional properties
- B32B 2307/748: Releasability
- B32B 2309/105: Thickness
- B32B 2457/00: Electrical equipment
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- C01P 2006/32: Thermal properties
- C09J 2423/04: Presence of homo or copolymers of ethene
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2467/00: Presence of polyester
- C09J 2479/08: polyimide
- C09J 2483/00: Presence of polysiloxane
- H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)}
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention provides, with use of a particular material, (i) a graphite laminate that has high thermal conductivity and that is unlikely to contain a void, (ii) a graphite laminate that is good in thermal conductivity and peel strength, (iii) methods for producing such graphite laminates, (iv) heat transport structures including such graphite laminates, (v) a rod-shaped heat transporter whose operating temperature is not limited and which can be used stably, and (vi) an electronic device including a rod-shaped heat transporter.

## Claims

### Claim at position 1

-10. (canceled)

### Claim 11

A graphite laminate, comprising:
graphite sheets; and
adhesive layers,
the graphite sheets and the adhesive layers being disposed alternately on top of each other,
the adhesive layers each containing at least one of a thermoplastic resin and a thermosetting resin,
the adhesive layers each having a water absorption rate of not more than 2% and a thickness of less than 15 μm,
the graphite sheets being included in the graphite laminate in a number of not less than 3.

### Claim 12

A graphite laminate, comprising:
graphite sheets; and
adhesive layers,
the graphite sheets and the adhesive layers being disposed alternately on top of each other,
the adhesive layers each containing at least one of a thermoplastic resin and a thermosetting resin,
the adhesive layers each having a thickness of less than 15 μm,
the graphite sheets being included in the graphite laminate in a number of not less than 3,
the graphite laminate having a water absorption rate of not more than 0.25%.

### Claim 13 (depends on 11)

The graphite laminate according to claim 11, wherein the thermoplastic resin and the thermosetting resin each have a glass transition point of not lower than 50° C.

### Claim 14 (depends on 11)

The graphite laminate according to claim 11, wherein the graphite sheets each have a thermal conductivity of not less than 1000 W/(m·K) in a surface direction.

### Claim 15 (depends on 11)

The graphite laminate according to claim 11, wherein the graphite laminate is bent so as to have at least one bent portion.

### Claim 16

A graphite laminate, comprising:
graphite sheets; and
adhesive layers,
the graphite sheets and the adhesive layers each having a surface defined by an X axis and a Y axis, which is orthogonal to the X axis, the graphite sheets and the adhesive layers being disposed alternately on top of each other in a direction of a Z axis, which is perpendicular to the surface, in such a manner that the respective surfaces of the graphite sheets and the adhesive layers overlap with each other, the graphite laminate being bent so as to have at least two bent portions,
each of the at least two bent portions being one of (a) to (c) below,
(a) a first bent portion, which is formed by bending the graphite laminate in a direction of the X axis or the Y axis,
(b) a second bent portion, which is formed by bending the graphite laminate in the direction of the Z axis, and
(c) a third bent portion, which is formed by bending the graphite laminate in the direction of the X axis or the Y axis and also in the direction of the Z axis.

### Claim 17

A graphite laminate, comprising:
graphite sheets; and
adhesive layers,
the graphite sheets and the adhesive layers each having a surface defined by an X axis and a Y axis, which is orthogonal to the X axis, the graphite sheets and the adhesive layers being disposed alternately on top of each other in a direction of a Z axis, which is perpendicular to the surface, in such a manner that the respective surfaces of the graphite sheets and the adhesive layers overlap with each other,
the graphite laminate being bent so as to have at least one bent portion,
each of the at least one bent portion being (c) below,
(c) a third bent portion, which is formed by bending the graphite laminate in a direction of the X axis or the Y axis and also in the direction of the Z axis.

### Claim 18 (depends on 11)

The graphite laminate according to claim 11, wherein in a case where (i) one end of the graphite laminate is fixed so that the graphite laminate is horizontal with respect to ground and then (ii) a load is imposed on a cross section of the graphite laminate which cross section is located 4 cm away from the fixed end, the load being 0.7 g per 1 mm2 of the cross section, the cross section has a displacement of not more than 15 mm.

### Claim 19 (depends on 11)

A heat transport structure, comprising:
a graphite laminate according to claim 11; and
a heat-generating element,
the graphite laminate being connected with a high-temperature site, whose temperature is raised by heat generated by the heat-generating element, and with a low-temperature site, whose temperature is lower than the temperature of the high-temperature site.

### Claim at position 11

-25. (canceled)

### Claim 26

A graphite laminate, comprising:
graphite sheets; and
adhesive layers,
the graphite sheets and the adhesive layers being disposed alternately on top of each other,
the adhesive layers each containing at least one of a thermoplastic resin and a thermosetting resin,
the graphite sheets being included in the graphite laminate in a number of not less than 3,
the graphite sheets and the adhesive layers being in close contact with each other at not less than 50% of an interface therebetween.

### Claim at position 13

-31. (canceled)

### Claim 32 (depends on 12)

The graphite laminate according to claim 12, wherein the thermoplastic resin and the thermosetting resin each have a glass transition point of not lower than 50° C.

### Claim 33 (depends on 12)

The graphite laminate according to claim 12, wherein the graphite sheets each have a thermal conductivity of not less than 1000 W/(m·K) in a surface direction.

### Claim 34 (depends on 12)

The graphite laminate according to claim 12, wherein the graphite laminate is bent so as to have at least one bent portion.

### Claim 35 (depends on 12)

The graphite laminate according to claim 12, wherein in a case where (i) one end of the graphite laminate is fixed so that the graphite laminate is horizontal with respect to ground and then (ii) a load is imposed on a cross section of the graphite laminate which cross section is located 4 cm away from the fixed end, the load being 0.7 g per 1 mm2 of the cross section, the cross section has a displacement of not more than 15 mm.

### Claim 36 (depends on 12)

A heat transport structure, comprising:
a graphite laminate according to claim 12; and
a heat-generating element,
the graphite laminate being connected with a high-temperature site, whose temperature is raised by heat generated by the heat-generating element, and with a low-temperature site, whose temperature is lower than the temperature of the high-temperature site.

### Claim 37 (depends on 16)

The graphite laminate according to claim 16, wherein in a case where (i) one end of the graphite laminate is fixed so that the graphite laminate is horizontal with respect to ground and then (ii) a load is imposed on a cross section of the graphite laminate which cross section is located 4 cm away from the fixed end, the load being 0.7 g per 1 mm2 of the cross section, the cross section has a displacement of not more than 15 mm.

### Claim 38 (depends on 16)

A heat transport structure, comprising:
a graphite laminate according to claim 16; and
a heat-generating element,
the graphite laminate being connected with a high-temperature site, whose temperature is raised by heat generated by the heat-generating element, and with a low-temperature site, whose temperature is lower than the temperature of the high-temperature site.

### Claim 39 (depends on 17)

The graphite laminate according to claim 17, wherein in a case where (i) one end of the graphite laminate is fixed so that the graphite laminate is horizontal with respect to ground and then (ii) a load is imposed on a cross section of the graphite laminate which cross section is located 4 cm away from the fixed end, the load being 0.7 g per 1 mm2 of the cross section, the cross section has a displacement of not more than 15 mm.

### Claim 40 (depends on 17)

A heat transport structure, comprising:
a graphite laminate according to claim 17; and
a heat-generating element,
the graphite laminate being connected with a high-temperature site, whose temperature is raised by heat generated by the heat-generating element, and with a low-temperature site, whose temperature is lower than the temperature of the high-temperature site.