Thermal interface materials

Patent metadata

Field	Value
Publication number	US-12509618-B2
Application number	US-202218262771-A
Country	US
Kind code	B2
Filing date	May 4, 2022
Priority date	May 5, 2021
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

Thermally conductive compositions include a blocked isocyanate prepolymer composition containing an isocyanate prepolymer blocked with one or more of alkylphenol or alkenylphenol; and an amine composition containing: one or more polyetheramines, and one or more catalysts selected from a group consisting of carboxy late salts, tertiary amines, amidines, guanidines, and diazabicyclo compounds; and a thermally conductive filler present at a percent by weight of the thermally conductive composition (wt %) in a range of 60 wt % to 98 wt %; wherein the thermally conductive composition cures at a temperature in the range of 18° C. to 35° C. when the blocked isocyanate prepolymer composition and the amine composition are mixed. Methods include preparing a thermally conductive gap filler prepared by combining a blocked isocyanate prepolymer composition and an amine composition, and curing the resulting thermally conductive composition, such as at room temperature.

First claim

The invention claimed is:

1 . A thermally conductive composition, comprising:
a blocked isocyanate prepolymer composition comprising an isocyanate prepolymer blocked with one or more of alkylphenol or alkenylphenol; and an amine composition comprising:
one or more polyetheramines, and
one or more catalysts selected from a group consisting of carboxylate salts, tertiary amines, amidines, guanidines, and diazabicyclo compounds; and
a thermally conductive filler present at a percent by weight of the thermally conductive composition (wt %) in a range of 60 wt % to 98 wt %; wherein the thermally conductive composition cures at a temperature in the range of 18° C. to 35° C. when the blocked isocyanate prepolymer composition and the amine composition are mixed.

2 . The composition of claim 1 , wherein the amine composition comprises one or more polyether amines with a molecular weight of 300 to 7000 Da and an average amine functionality greater than 2.

3 . The composition of claim 1 , wherein the thermally conductive filler is modified with a treatment agent prior to combination with the thermally conductive composition, the treatment agent comprising one or more selected from a group consisting of fatty acids, silane treating agents, titanates, zirconates, aluminates, and silazane compounds.

4 . The composition of claim 1 , wherein the thermally conductive filler is pretreated with a C5 to C20 alkylsilane.

5 . The composition of claim 1 , wherein the blocked isocyanate prepolymer is present at a percent by weight of the thermally conductive composition (wt %) in a range of 1 wt % to 15 wt %.

6 . The composition of claim 1 , further comprising a hyperbranched polyester dispersion additive in the amine composition.

7 . The composition of claim 1 , wherein the thermally conductive filler comprises a mixture of aluminum trihydrate (ATH) fillers having a bimodal particle size distribution produced by blending one filler having D 50 in the range of 0.1 to 20 μm and second filler having D 50 in the range of 10 to 200 μm.

8 . The composition of claim 1 , wherein the blocked isocyanate prepolymer composition and the amine composition each have a squeeze force, as determined by compression using a probe having a diameter of 40 mm lowered at a rate of 1.0 mm/see to a gap of 0.5 mm, of 250 N or less.

9 . A thermally conductive gap filler prepared by combining the blocked isocyanate prepolymer composition and the amine composition, and curing the resulting thermally conductive composition of claim 1 .

10 . A method of using the thermally conductive composition of any claim 1 , the method comprising combining the blocked isocyanate prepolymer composition and the amine composition; and emplacing the thermally conductive composition between a heat source and a heat sink in an EV battery.

Assignees

• Dow Global Technologies Llc
• Dow Silicones Corp

Inventors

• Agarwal Praveen
• Harris William J
• Chang Chi-Hao

Classifications

• C08L2205/14

  containing polymeric additives characterised by shape · CPC title

• C08L75/04

  Polyurethanes · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08K2003/0812

  Aluminium · CPC title

• C08K5/0016

  Plasticisers · CPC title