Thermally conductive silicone compositions
AssigneeElkem Silicones France SAS
InventorsAurelie Pelle, Lucile Fauvre, Julie Dubois
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Abstract
The present invention relates to organopolysiloxane compositions comprising an organopolysiloxane having, per molecule, at least two alkenyl groups, an organopolysiloxane having, per molecule, at least two SiH units, a hydrosilylation catalyst, and a thermally conductive filler, the thermally conductive filler comprising at least 40% by weigh of metallic silicon, and a specific particle size distribution. The invention further relates to a silicone elastomer which can be obtained by cross-linking and/or curing the composition, as well as its use as a thermally conductive material for coating or filling, in particular for the automotive field, in particular for the field of electric vehicles.
Claims13
An organopolysiloxane composition X comprising:
- at least one organopolysiloxane A having per molecule at least two silicon-bonded C2-C6 alkenyl groups,
- at least one organopolysiloxane B having per molecule at least two SiH units,
- a catalytically effective amount of at least one hydrosilylation catalyst C, and
- a thermally conductive filler D,
- wherein
- said thermally conductive filler D comprises at least 40% by weight of metallic silicon,
- said thermally conductive filler D comprises between 3% and 22% of particles having a diameter of less than or equal to 2 μm, and the particle size distribution is such that the ratio d90/d10 of said filler is greater than or equal to 20.
An intermediate composition comprising:
- at least one organopolysiloxane A having per molecule at least two silicon-bonded C2-C6 alkenyl groups, and
- a thermally conductive filler D,
- wherein
- said thermally conductive filler D comprises at least 40% by weight of metallic silicon,
- said thermally conductive filler D comprises between 3% and 22% of particles having a diameter of less than or equal to 2 μm, and the particle size distribution is such that the ratio d90/d10 of said filler is greater than or equal to 20.
Dependencies are inferred from the claim text.