Sealants and display device including the same
A sealant is provided. The sealant includes an acrylic type compound having at least two acrylic groups per one molecule, an epoxy type compound having at least one epoxy group per one molecule, and a dihydrazide compound. The dihydrazide compound includes 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) and adipic acid dihydrazide. A display device is also provided. The display device includes a pair of substrates and a sealing pattern between the pair of substrates. The sealing pattern includes the sealant.
1 . A sealant, comprising:
an acrylic type compound having at least two acrylic groups per one molecule;
an epoxy type compound having at least one epoxy group per one molecule; and
a dihydrazide compound including 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) and adipic acid dihydrazide.
2 . The sealant as set forth in claim 1 , wherein the acrylic type compound comprises at least one selected from the group consisting of first to fourth compounds which are expressed by the following chemical formulas 1 to 4 respectively, and wherein “R” in each of the chemical formulas 1 to 4 denotes a hydrocarbon group and “n” in the chemical formula 4 denotes a natural number:
3 . The sealant as set forth in claim 1 , wherein a weight percentage of the 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) is greater than a weight percentage of the adipic acid dihydrazide in the dihydrazide compound.
4 . The sealant as set forth in claim 3 , wherein a weight ratio of the 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) to the adipic acid dihydrazide is between about 7:2 and about 9:2.
5 . The sealant as set forth in claim 1 , wherein a weight percentage of the acrylic type compound is greater than a weight percentage of the epoxy type compound.
6 . The sealant as set forth in claim 5 , wherein a weight ratio of the acrylic type compound to the epoxy type compound is between about 1:1 and about 5:1.
7 . The sealant as set forth in claim 1 , further comprising:
a hybrid compound having an acrylic group and an epoxy group;
an inorganic filler; and
an organic filler.
8 . The sealant as set forth in claim 7 , wherein the acrylic type compound has a content of 32 wt % to 38 wt %, the epoxy type compound has a content of 23 wt % to 29 wt %, the hybrid compound has a content of 7 wt % to 11 wt %, the dihydrazide compound has a content of 8 wt % to 12 wt %, the inorganic filler has a content of 12 wt % to 16 wt %, and the organic filler has a content of 3 wt % to 7 wt %.
9 . A display device, comprising:
a first substrate having a display area;
a second substrate facing the first substrate; and
a sealing pattern disposed between the first and second substrates to attach the first substrate to the second substrate, the sealing pattern including a sealant, comprising:
an acrylic type compound having at least two acrylic groups per one molecule;
an epoxy type compound having at least one epoxy group per one molecule; and
a dihydrazide compound including 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) and adipic acid dihydrazide.
10 . The display device as set forth in claim 9 , wherein the acrylic type compound comprises at least one selected from the group consisting of first to fourth compounds which are expressed by the following chemical formulas 1 to 4 respectively, and wherein “R” in each of the chemical formulas 1 to 4 denotes a hydrocarbon group and “n” in the chemical formula 4 denotes a natural number:
11 . The display device as set forth in claim 9 , wherein a weight percentage of the 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) is greater than a weight percentage of the adipic acid dihydrazide in the dihydrazide compound.
12 . The display device as set forth in claim 11 , wherein a weight ratio of the 4-isopropyl-2,5-dioxoimidazolidin-1,3-di(propyonohydrazide) to the adipic acid dihydrazide is between about 7:2 and about 9:2.
13 . The display device as set forth in claim 9 , wherein a weight percentage of the acrylic type compound is greater than a weight percentage of the epoxy type compound in the sealant.
14 . The display device as set forth in claim 13 , wherein a weight ratio of the acrylic type compound to the epoxy type compound is between about 1:1 and about 5:1.
15 . The display device as set forth in claim 9 , wherein the sealant further comprises:
a hybrid compound having an acrylic group and an epoxy group;
an inorganic filler; and
an organic filler.
16 . The display device as set forth in claim 15 , wherein the acrylic type compound has a content of 32 wt % to 38 wt %, the epoxy type compound has a content of 23 wt % to 29 wt %, the hybrid compound has a content of 7 wt % to 11 wt %, the dihydrazide compound has a content of 8 wt % to 12 wt %, the inorganic filler has a content of 12 wt % to 16 wt %, and the organic filler has a content of 3 wt % to 7 wt %.
17 . The display device as set forth in claim 9 , further comprising a liquid crystal layer disposed between the first and second substrates.