# US 10,121,724 B2 · Heat diffusion sheet

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- Number: US 10,121,724 B2
- Document ID: US10121724B2
- Status: Granted
- Kind: B2
- Application number: 15/300,400
- Filed: 2015-02-17
- Published: 2017-05-18
- Granted: 2018-11-06
- Earliest claimed: 2014-03-31
- Assignees: Dexerials Corporation
- Applicants: Dexerials Corporation
- Inventors: Minoru Nagashima; Teruo Hiyama
- Web page: https://patentgrep.com/patent/US10121724B2

## CPC

- H10W 40/255: {having a laminate or multilayered structure, e.g. direct bond copper [DBC] ceramic substrates}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 9/007: {comprising carbon, e.g. graphite, composite carbon}
- B32B 9/045: {of synthetic resin}
- B32B 27/36: comprising polyesters
- F28F 21/02: of carbon, e.g. graphite
- H10W 40/25: characterised by their materials
- H10W 40/251: {Organics}
- B32B 2250/02: 2 layers
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2307/302: Conductive
- B32B 2307/50: having particular mechanical properties
- B32B 2307/732: Dimensional properties
- B32B 2307/748: Releasability
- B32B 2313/04: Carbon
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- B32B 2405/00: Adhesive articles, e.g. adhesive tapes
- B32B 2457/14: Semiconductor wafers
- B32B 2457/206: Organic displays, e.g. OLED
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

A heat diffusion sheet 2 has a configuration in which a composite adhesive film is formed on a surface of a graphite sheet 10 having a thickness of 300 μm or more and 2,000 μm or less. This composite adhesive film has a configuration in which (A) an acrylic adhesive layer that has a thickness of 5 μm or more and 15 μm or less and does not contain a thermally conductive material, (B) a polyester film having a thickness of 20 μm or more and 60 μm or less, and (C) a silicone adhesive layer that has a thickness of 2 μm or more and 25 μm or less, does not contain a thermally conductive material, and has a peel strength of 0.005 N/cm or more and 1.0 N/cm or less are sequentially layered on the graphite sheet 10.

## Claims

### Claim 1

A heat diffusion sheet comprising a graphite sheet and a composite adhesive film formed on a surface of the graphite sheet, wherein
the graphite sheet has a thickness of 300 μm or more and 2,000 μm or less,
the composite adhesive film includes:
(A) an acrylic adhesive layer that has a thickness of 5 μm or more and 15 μm or less and does not contain a thermally conductive material,
(B) a polyester film having a thickness of 20 μm or more and 60 μm or less, and
(C) a silicone adhesive layer that has a thickness of 2 μm or more and 25 μm or less, does not contain a thermally conductive material, and has a peel strength of 0.005 N/cm or more and 1.0 N/cm or less,
the acrylic adhesive layer, the polyester film, and the silicone adhesive layer are sequentially layered from the graphite sheet,
the polyester film is a biaxially stretched polyethylene terephthalate (PET) film,
a tensile strength of the composite adhesive film in a MD direction falls within a range of 100 MPa or more and 300 MPa or less,
a tensile strength of the composite adhesive film in a TD direction falls within a range of 10 MPa or more and 50 MPa or less, and
a storage elastic modulus of the composite adhesive film falls within a range of 1,000 Pa or more and 10,000 MPa or less.