Curable composition and cured material
A curable composition and a cured material containing: a compound (A) having one (meth)acrylate group in one molecule; a compound (B) having two or more (meth)acrylate groups in one molecule; a polymerization initiator (C); a dispersant (D); and a thermally conductive filler (E) containing zinc oxide.
1 . A curable composition, comprising:
a compound (A) having one (meth)acrylate group in one molecule;
a compound (B) having two or more (meth)acrylate groups in one molecule;
a polymerization initiator (C);
a dispersant (D); and
a thermally conductive filler (E) containing magnesium oxide,
wherein the dispersant (D) comprises at least one compound selected from the group consisting of a polyglycerin monoalkyl ether compound, a compound having a carboxy group, and a metallic soap,
wherein a content of the dispersant (D) is from 1.5 parts by mass to 3 parts by mass with respect to 100 parts by mass of the compound (A),
wherein the thermally conductive filler (E) further contains zinc oxide,
wherein when the thermally conductive filler (E) contains a compound other than the magnesium oxide and the zinc oxide, the content of the compound other than the magnesium oxide and the zinc oxide is 10% by mass or less relative to the total mass of the thermally conductive filler (E),
wherein a content of the magnesium oxide with respect to a total mass of the thermally conductive filler (E) is from 10% by mass to 70% by mass.
2 . The curable composition according to claim 1 , wherein the compound (A) comprises a compound represented by the following general formula (1):
wherein, in the general formula (1), R 1 represents an alkyl group having from 10 to 50 carbon atoms, and R 2 represents a hydrogen atom or a methyl group.
3 . The curable composition according to claim 1 , wherein the compound (B) comprises a compound represented by the following general formula (2):
wherein, in the general formula (2), R B1 represents an alkylene group having from 1 to 5 carbon atoms, each of R B2 and R B3 independently represents a hydrogen atom or a methyl group, and n is an integer of 4 or more.
4 . The curable composition according to claim 1 , further comprising a plasticizer (F).
5 . The curable composition according to claim 4 , wherein the plasticizer (F) comprises an acrylic polymer having a glass transition temperature of −20° C. or lower.
6 . The curable composition of claim 4 , wherein the plasticizer (F) comprises a trimellitic acid ester.
7 . The curable composition according to claim 1 , wherein a content of the compound (B) is from 0.5 parts by mass to 10 parts by mass with respect to 100 parts by mass of the compound (A).
8 . The curable composition according to claim 1 , wherein a content of the thermally conductive filler (E) is from 70% by mass to 98% by mass with respect to a total mass of the curable composition.
9 . A cured material, comprising the curable composition according to claim 1 after curing.