Thermal interface materials with low secant modulus of elasticity and high thermal conductivity

Patent metadata

Field	Value
Publication number	US-10155896-B2
Application number	US-201715819379-A
Country	US
Kind code	B2
Filing date	Nov 21, 2017
Priority date	Jun 30, 2015
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

Disclosed are exemplary embodiments of thermal interface materials with low secant modulus of elasticity and high thermal conductivity.

First claim

What is claimed is:

1. A thermal interface material comprising a matrix or base resin loaded with thermally-conductive filler, wherein the thermal interface material has a thermal conductivity of at least 6 Watts per meter per Kelvin and a secant modulus of elasticity of no more than 620 kilopascals (kPa) at 50% strain for 1.5 millimeter (mm) initial thickness material, wherein:
a ratio of the thermal interface material's secant modulus of elasticity to thermal conductivity falls within a range from about 0.46 to about 64.6 and/or a ratio of the thermal interface material's thermal conductivity to secant modulus of elasticity falls within a range from about 0.015 to about 2.18;
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 80 weight % of the thermally-conductive filler;
the thermally-conductive filler comprises one or more of alumina, aluminum, zinc oxide, boron nitride, silicon nitride, aluminum nitride, iron, metallic oxides, graphite, silver, copper, and ceramic; and
the matrix or base resin comprises:
a polydimethylsiloxane (PDMS); or
silicone polymer with platinum catalyst and silicone polymer with SiH crosslinking oligomer; or
a process oil.

2. The thermal interface material of claim 1 , wherein
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 90 weight % of the thermally-conductive filler.

3. A thermal interface material comprising a matrix or base resin loaded with thermally-conductive filler, wherein the thermal interface material has a thermal conductivity of at least 6 Watts per meter per Kelvin and a secant modulus of elasticity of no more than 620 kilopascals (kPa) at 50% strain for 1.5 millimeter (mm) initial thickness material, wherein the thermally-conductive filler comprises alumina, and wherein:
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 80 weight % of the thermally-conductive filler; and
a ratio of the thermal interface material's secant modulus of elasticity to thermal conductivity falls within a range from about 0.46 to about 64.6; and
a ratio of the thermal interface material's thermal conductivity to secant modulus of elasticity falls within a range from about 0.015 to about 2.18; and
the matrix or base resin comprises:
a polydimethylsiloxane (PDMS); or
silicone polymer with platinum catalyst and silicone polymer with SiH crosslinking oligomer; or
a process oil.

4. A thermal interface material comprising a matrix or base resin loaded with thermally-conductive filler, wherein the thermal interface material has a thermal conductivity of at least 6 Watts per meter per Kelvin and a secant modulus of elasticity of no more than 620 kilopascals (kPa) at 50% strain for 1.5 millimeter (mm) initial thickness material, wherein:
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 90 weight % of the thermally-conductive filler; and
the matrix or base resin comprises silicone polymer with platinum catalyst and crosslinker.

5. The thermal interface material of claim 1 , wherein the matrix or base resin comprises silicone polymer with platinum catalyst and silicone polymer with SiH crosslinking oligomer.

6. The thermal interface material of claim 1 , wherein:
the thermally-conductive filler comprises alumina and/or aluminum; and
the ratio of the thermal interface material's secant modulus of elasticity to thermal conductivity falls within the range from about 0.46 to about 64.6; and
the ratio of the thermal interface material's thermal conductivity to secant modulus of elasticity falls within the range from about 0.015 to about 2.18.

7. The thermal interface material of claim 1 , wherein:
the thermally-conductive filler comprises alumina and/or aluminum; and/or
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 90 weight % of the thermally-conductive filler.

8. A thermal interface material comprising a matrix or base resin loaded with thermally-conductive filler, wherein the thermal interface material has a thermal conductivity of at least 6 Watts per meter per Kelvin and a secant modulus of elasticity of no more than 620 kilopascals (kPa) at 50% strain for 1.5 millimeter (mm) initial thickness material, wherein:
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 80 weight % of the thermally-conductive filler; and
the matrix or base resin comprises a polydimethylsiloxane (PDMS).

9. A thermal interface material comprising a matrix or base resin loaded with thermally-conductive filler, wherein the thermal interface material has a thermal conductivity of at least 6 Watts per meter per Kelvin and a secant modulus of elasticity of no more than 620 kilopascals (kPa) at 50% strain for 1.5 millimeter (mm) initial thickness material, wherein:
the matrix or base resin is loaded with the thermally-conductive filler such that the thermal interface material includes at least 80 weight % of the thermally-conductive filler; and
the matrix or base resin comprises silicone polymer with platinum catalyst and silicone polymer with SiH crosslinking oligomer.

10. The thermal interface material of claim 1 , wherein the matrix or base resin comprises the process oil.

11. The thermal interface material of claim 1 , wherein:
the thermal interface material is a dispensable material or a bulk putty; and
the thermal interface material has a thermal conductivity of at least 8 Watts per meter per Kelvin.

12. A thermal interface material comprising a matrix or base resin loaded with thermally-conductive filler, wherein the thermal interface material has a thermal conductivity of at least 6 Watts per meter per Kelvin and a secant modulus of elasticity of no more than 620 kilopascals (kPa) at 50% strain for 1.5 millimeter (mm) initial thickness material, wherein:
the thermal interface material has a secant modulus of elasticity of no more than 17 kPA at 50% strain for 1.5 mm initial thickness material and a thermal conductivity of at least 9 Watts per meter per Kelvin, the matrix or base resin comprises silicone polymer with platinum catalyst and silicone polymer with SiH crosslinking oligomer, and the thermal interface material further comprises pigment and coupling agent; or
the thermal interface material is a dispensable material having a secant modulus of elasticity of no more than 3.8 kPa at 50% strain for 1.5 mm initial thickness material and a thermal conductivity of at least 8.3 Watts per meter per Kelvin, the matrix or base resin comprises a polydimethylsiloxane (PDMS), and the thermal interface material further comprises pigment and coupling agent, or
the thermal interface material has a secant modulus of elasticity of no more than 269 kPA at 50% strain for 1.5 mm initial thickness material and a thermal conductivity of at least 9 Watts per meter per Kelvin, the matrix or base resin comprises process oil, and the thermal interface material further comprises pigment and coupling agent.

13. The thermal interface material of claim 1 , wherein the thermal interface material has:
a secant modulus of elasticity of no more than 17 kPa at 50% strain for 1.5 mm initial thickness material; or
a secant modulus of elasticity of no more than 3.8 kPa at 50% strain for 1.5 mm initial thickness material; or
a secant modulus of elasticity of no more than about 14

Assignees

• Laird Technologies Inc

Inventors

• Bruzda Karen
• Cancar Kathryn

Classifications

• H10W40/25

  characterised by their materials · CPC title

• H10W40/251

  Organics · CPC title

• H10W40/70

  Fillings or auxiliary members in containers or in encapsulations for thermal protection or control · CPC title

• C08K2003/282

  Binary compounds of nitrogen with aluminium · CPC title

• C08K2003/2296

  of zinc · CPC title