Heat conduction composition
A heat conduction composition is proposed, comprising at least one polymer and a heat-conducting auxiliary material that has an especially high heat conductivity and at the same time has a high mechanical strength. To this end, the heat-conducting auxiliary material comprises particles that in turn are made up of primary particles and that have a mass-specific surface area of 1.3 m 2 /g or less. Also described are a heat-conducting surface element manufactured from said heat conduction composition as well as application possibilities thereof.
1. A thermal conduction composition comprising at least one (meth)acrylic acid-based polymer and a thermally conducting auxiliary, wherein
the thermally conducting auxiliary comprises particles that (A) have a mass-based specific surface area of 1.3 m 2 /g or less and (B) are composed of primary particles;
the thermal conduction composition is formulated as an adhesive; and
the thermal conduction composition exhibits a thermal conductivity that is higher than that of a composition otherwise identical to the thermal conduction composition except for having a thermal conducting auxiliary comprising particles that (A) have a mass-based specific surface area greater than 1.3 m 2 /g and (B) are composed of primary particles.
2. The thermal conduction composition of claim 1 , wherein the primary particles have an average diameter of at least 1 μm.
3. The thermal conduction composition of claim 1 , wherein the particles of the thermally conducting auxiliary that have a mass-based specific surface area of 1.3 m 2 /g or less have a mass-based specific surface area of 1.0 m 2 /g or less.
4. The thermal conduction composition of claim 1 , wherein the particles of the thermally conducting auxiliary that have a mass-based specific surface area of 1.3 m 2 /g or less comprise at least substantially aluminum oxide particles, boron nitride particles or a mixture of aluminum oxide and boron nitride particles.
5. The thermal conduction composition of claim 4 , wherein the aluminum oxide particles are composed in a fraction of more than 95% by weight of alpha-aluminum oxide.
6. The thermal conduction composition of claim 1 , wherein the thermally conducting auxiliary is composed of material having a thermal conductivity of more than 1 W/mK.
7. The thermal conduction composition of claim 1 , wherein the thermally conducting auxiliary is present in the thermal conduction composition in a fraction of at least 5% and not more than 70% by volume, based in each case on the volume of the thermally conducting auxiliary in the thermal conduction composition.
8. The thermal conduction composition of claim 1 , wherein the particles that have a mass-based specific surface area of 1.3 m 2 /g or less have an average diameter in a range from 2 μm to 500 μm.
9. The thermal conduction composition of claim 1 , wherein said at least one polymer is a polymer based on at least one of acrylic esters, methacrylic esters and derivatives thereof.
10. The thermal conduction composition of claim 1 , which further comprises a further auxiliary with a phase change material.
11. A method for producing a thermally conducting sheetlike element comprising incorporating a thermal conduction composition of claim 1 into said thermally conducting sheetlike element.
12. A method for heat transport within an electronics device comprising incorporating a thermal conduction composition of claim 1 into said electronics device.
13. The thermal conduction composition of claim 1 , wherein the particles of the thermally conducting auxiliary that have a mass-based specific surface area of 1.3 m 2 /g or less comprise aluminum oxide particles.