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An inorganic filler according to an embodiment of the present invention includes a boron nitride agglomerate and a coating layer formed on the boron nitride agglomerate and including a —Si—R—NH2 group, and R is selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alken

An inorganic filler according to an embodiment of the present invention includes a boron nitride agglomerate and a coating layer formed on the boron nitride agglomerate and including a —Si—R—NH2 group, and R is selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkene group having 2 to 3 carbon atoms, and an alkyne group having 2 to 3 carbon atoms.

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1. A method of preparing an inorganic filler, the method comprising: mixing a boron nitride agglomerate that is formed by agglomerating plate-shaped boron nitrides with a polysilazane, an amino silane and a solvent;forming a coating layer on the boron nitride agglomerate; andcuring and sintering,whe

1. A method of preparing an inorganic filler, the method comprising: mixing a boron nitride agglomerate that is formed by agglomerating plate-shaped boron nitrides with a polysilazane, an amino silane and a solvent;forming a coating layer on the boron nitride agglomerate; andcuring and sintering,wherein the coating layer comprises the following functional group: wherein R is selected from the group consisting of an alkylene group having 1 to 3 carbon atoms, an alkenylene group having 2 to 3 carbon atoms, and an alkynylene group having 2 to 3 carbon atoms. 2. The method of claim 1, wherein the polysilazane has the following formula 1: [formula 1] wherein R is selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkene group having 2 to 3 carbon atoms, and an alkyne group having 2 to 3 carbon atoms, and n is a positive integer. 3. The method of claim 1, wherein a condensation reaction occurs between the aminosilane and the hydrolyzed polysilazan in the process of forming of the coating layer. 4. The method of claim 3, wherein a polymer that is formed by the condensation reaction permeates at least a portion of pores in the boron nitride agglomerate. 5. The method of claim 4, wherein the polymer that is formed by the condensation reaction has the following functional group: 6. The method of claim 5, wherein the polymer has the following formula: wherein R is selected from the group consisting of an alkylene group having 1 to 3 carbon atoms, an alkenylene group having 2 to 3 carbon atoms, and an alkynylene group having 2 to 3 carbon atoms, andwherein at least one of R1, R2, R3 and R4 is selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkene group having 2 to 3 carbon atoms, and an alkyne group having 2 to 3 carbon atoms. 7. The method of claim 4, wherein the polymer that is formed by the condensation reaction has a liquid phase in the process of forming the coating layer. 8. The method of claim 1, wherein the curing and sintering comprises: heating at a first temperature; andprocessing pyrolysis at a second temperature higher than the first temperature. 9. The method of claim 8, wherein at least one of CH4, C2H4, C2H6 and NH3 is emitted as a result of the pyrolysis process. 10. The method of claim 8, wherein the pyrolysis process is performed in a nitrogen atmosphere. 11. The method of claim 1, wherein at least a portion of the solvent is volatilized in the process of forming the coating layer. 12. The method of claim 1, wherein a thickness of the coating layer is 1 μm to 21 μm. 13. The method of claim 1, wherein the coating layer has the following formula: wherein R is selected from the group consisting of an alkylene group having 1 to 3 carbon atoms, an alkenylene group having 2 to 3 carbon atoms, and an alkynylene group having 2 to 3 carbon atoms, andwherein at least one of R1, R2, R3 and R4 is selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkene group having 2 to 3 carbon atoms, and an alkyne group having 2 to 3 carbon atoms.