Acrylic-based thermally conductive composition and thermally conductive sheet
Provided is a thermally conductive composition which shows a low thermal resistance, and good releasability after service. For example, one composition includes an acrylic-based thermally conductive composition comprising a binder component containing a crystalline acrylic polymer with an alkyl group of 18 carbons or more and a thermally conductive filler.
1. An acrylic thermally conductive composition comprising:
a thermally conductive filler; and
a crystalline aliphatic acrylic polymer comprising from 55 to 80 wt % of a homopolymer or copolymer of one or more (meth)acrylate ester monomers containing an alkyl group of 18 or more carbon atoms and further comprises a homopolymer or copolymer of one or more (meth)acrylic monomers wherein the (meth)acrylic monomers contain an alkyl group of 12 carbons or less.
2. A composition according to claim 1 wherein the (meth)acrylate ester monomers are selected from octadecyl (meth)acrylate, nonadecyl(meth)acrylate, icosanyl(meth)acrylate, henicosanyl(meth)acrylate, docosanyl(meth)acrylate, tricosanyl(meth)acrylate, tetracosanyl(meth)acrylate, octadodecyl(meth)acrylate, and combinations thereof.
3. A composition according to claim 1 wherein (meth)acrylic monomers are selected from ethyl (meth)acrylate, butyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, and combinations thereof.
4. A composition according to claim 1 wherein the crystalline acrylic polymer has a melting point of 25° C. or higher and 100° C. or lower.
5. A thermally conductive sheet obtained from a composition according to claim 1 .
6. A laminate comprising:
an electronic part;
a thermally conductive sheet obtained from a composition according to claim 1 having a first side and a second side, wherein the first side is in contact with the electronic part; and
a heat sink or heat radiator in contact with the second side of the thermally conductive sheet.
7. A laminate according to claim 6 wherein the electronic part is selected from a power transistor, a graphic IC, chip sets, memory chips, central processing units, and combinations thereof.
8. A laminate according to claim 6 wherein the thickness of the thermally conductive sheet is less than 10 mm.
9. A laminate according to claim 8 wherein the thickness of the thermally conductive sheet is less than 5 mm.