THERMALLY CONDUCTIVE COMPOSITION, THERMALLY CONDUCTIVE SHEET AND METHOD FOR PRODUCING THE SAME
A thermally conductive composition 26 contains a base polymer, an adhesive polymer, and thermally conductive particles. A thermal conductivity of the thermally conductive composition 26 is 0.3 W/mK or more. The base polymer is a silicone polymer. The adhesive polymer contains a methyl hydrogen polysiloxane, an epoxy group-containing alkyltrialkoxysilane, and a cyclic polysiloxane oligomer. The amount of the adhesive polymer is 5 to 35 parts by weight with respect to 100 parts by weight of the base polymer. A thermally conductive sheet of the present invention includes the thermally conductive composition in the form of a sheet. Thus, the present invention provides a thermally conductive composition that has high thermal conductive properties and excellent resilience and that can prevent interfacial peeling due to stress, a thermally conductive sheet including the thermally conductive composition, and a method for producing the thermally conductive sheet.
1 . A thermally conductive composition comprising:
a base polymer;
an adhesive polymer; and
thermally conductive particles, wherein a thermal conductivity of the thermally conductive composition is 0.3 W/m·K or more,
the base polymer is a silicone polymer,
the adhesive polymer contains a methyl hydrogen polysiloxane, an epoxy group-containing alkyltrialkoxysilane, and a cyclic polysiloxane oligomer, and
an amount of the adhesive polymer is 5 to 35 parts by weight with respect to 100 parts by weight of the base polymer.
2 . The thermally conducive composition according to claim 1 , wherein a tensile lap-shear strength of the adhesive polymer with respect to an aluminum plate is 50 N/cm 2 or more.
3 . The thermally conductive composition according to claim 1 , wherein the base polymer is an addition curable silicone polymer.
4 . The thermally conductive composition according to claim 1 , further comprising a silicone oil.
5 . The thermally conductive composition according to claim 1 , wherein the thermally conductive particles are composed of at least one selected from a metal oxide, a metal hydroxide, a metal nitride, and silica.
6 . The thermally conductive composition according to claim 1 , wherein the thermally conductive particles are surface treated with a silane compound, a titanate compound, an aluminate compound, or partial hydrolysates thereof.
7 . The thermally conductive composition according to claim 1 , wherein the thermally conductive composition is formed into a sheet.
8 . A thermally conductive sheet comprising a thermally conductive composition in the form of a sheet,
the thermally conductive composition comprising a base polymer, an adhesive polymer, and thermally conductive particles,
wherein a thermal conductivity of the thermally conductive composition is 0.3 W/m·K or more,
the base polymer is a silicone polymer,
the adhesive polymer contains a methyl hydrogen polysiloxane, an epoxy group-containing alkyltrialkoxysilane, and a cyclic polysiloxane oligomer, and
an amount of the adhesive polymer is 5 to 35 parts by weight with respect to 100 parts by weight of the base polymer.
9 . The thermally conductive sheet according to claim 8 , wherein a tensile lap-shear strength of the adhesive polymer with respect to an aluminum plate is 50 N/cm 2 or more.
10 . The thermally conductive sheet according to claim 8 , wherein the base polymer is an addition curable silicone polymer.
11 . The thermally conductive sheet according to claim 8 , wherein the thermally conductive composition further comprises a silicone oil.
12 . The thermally conductive sheet according to claim 8 , wherein the thermally conductive particles are composed of at least one selected from a metal oxide, a metal hydroxide, a metal nitride, and silica.
13 . The thermally conductive sheet according to claim 8 , wherein the thermally conductive particles are surface treated with a silane compound, a titanate compound, an aluminate compound, or partial hydrolysates thereof.
14 . A method for producing a thermally conductive sheet using a thermally conductive composition,
the thermally conductive composition comprising a base polymer, an adhesive polymer, and thermally conductive particles,
wherein a thermal conductivity of the thermally conductive composition is 0.3 W/m·K or more,
the base polymer is a silicone polymer,
the adhesive polymer contains a methyl hydrogen polysiloxane, an epoxy group-containing alkyltrialkoxysilane, and a cyclic polysiloxane oligomer, and
an amount of the adhesive polymer is 5 to 35 parts by weight with respect to 100 parts by weight of the base polymer, the method comprising:
mixing the base polymer, the adhesive polymer, and the thermally conductive particles to form a compound;
molding the compound into a sheet, and then curing the sheet.
15 . The method according to claim 14 , wherein a tensile lap-shear strength of the adhesive polymer with respect to an aluminum plate is 50 N/cm 2 or more.
16 . The method according to claim 14 , wherein the base polymer is an addition curable silicone polymer.
17 . The method according to claim 14 , wherein the thermally conductive composition further comprises a silicone oil.
18 . The method according to claim 14 , wherein the thermally conductive particles are composed of at least one selected from a metal oxide, a metal hydroxide, a metal nitride, and silica.
19 . The method according to claim 14 , wherein the thermally conductive particles are surface treated with a silane compound, a titanate compound, an aluminate compound, or partial hydrolysates thereof.