Sealant composition

1 . A sealant composition, comprising:

organohydroxypolysiloxane;

precipitated calcium carbonate;

ground calcium carbonate;

carbon black;

a thickener; and

a curing agent,

wherein the thickener comprises polyether-modified organopolysiloxane,

wherein the precipitated calcium carbonate has a BET specific surface area of 10 m 2/ g to 50 m 2/ g and an average particle diameter of 0.01 μm to 0.5 μm,

wherein the ground calcium carbonate has a BET specific surface area of 0.1 m 2/ g to 5 m 2/ g and an average particle diameter of 1 μm to 10 μm, and

wherein the precipitated calcium carbonate, the ground calcium carbonate, and the carbon black are included in a weight ratio of 1.2 to 7:8 to 20:1.

2 . The sealant composition of claim 1 , wherein the organohydroxypolysiloxane has viscosity of 1,000 to 10,000 cP at 25° C., and has a hydroxyl group content of 0.01 to 0.5% by weight.

3 . The sealant composition of claim 1 , wherein the thickener has a hydrophile-lipophile balance (HLB) value of 5 to 20, and has viscosity of 100 to 500 cP at 25° C.

4 . The sealant composition of claim 1 , wherein the thickener is represented by the following Chemical Formula 1:

in Chemical Formula 1,

R 1 to R 4 and R 6 to R 8 are each independently a substituted or unsubstituted C 1-10 alkyl group;

R 5 is represented by the following Chemical Formula 2; and

x and y are each independently from 0.1 to 15,

in Chemical Formula 2,

R 10 and R 11 are each independently a substituted or unsubstituted C 1-10 alkylene group;

n is from 5 to 20; and

* is a bonding hand bonding to silicon.

5 . The sealant composition of claim 1 , comprising:

30 to 40% by weight of the organohydroxypolysiloxane;

6 to 15% by weight of the precipitated calcium carbonate;

36 to 50% by weight of the ground calcium carbonate;

2 to 5% by weight of the carbon black;

0.01 to 0.5% by weight of the thickener; and

1.2 to 7% by weight of the curing agent.