Alignment material and liquid crystal display using the same

1 . An alignment material, comprising:

a solvent;

a polymer resin mixed with the solvent to have a weight percent ranging from about 4% to about 8%, the polymer resin including an amic acid monomer having an amino group; and

a cross-linking agent mixed with the solvent to have a weight percent ranging from about 2% to about 20%, the cross-linking agent including a diepoxy group which reacts with the amino group.

2 . The alignment material of claim 1 , wherein the cross-linking agent has a boiling point ranging from about 130° C. to about 230° C.

3 . The alignment material of claim 2 , wherein the cross-linking agent has a molecular weight ranging from about 50 to about 200.

4 . The alignment material of claim 3 , wherein the polymer resin has a weight percent ranging from about 5% to about 7%, and the cross-linking agent has a weight percent ranging from about 10% to about 14%.

5 . The alignment material of claim 1 , wherein the solvent comprises at least one selected from the group consisting of γ-butirolactone, ethyleneglycolbutylether, and N-methylpyrrolidone.

6 . The alignment material of claim 1 , wherein the cross-linking agent comprises at least one cyclopentane compound selected from the group expressed by the following chemical formulas:

7 . The alignment material of claim 1 , wherein the cross-linking agent comprises at least one cyclopentene compound selected from the group expressed by the following chemical formulas:

8 . The alignment material of claim 1 , wherein the cross-linking agent comprises at least one cyclohexane compound selected from the group expressed by the following chemical formulas:

9 . The alignment material of claim 1 , wherein the cross-linking agent comprises at least one cyclohexene compound selected from the group expressed by the following chemical formulas:

10 . The alignment material of claim 1 , wherein the cross-linking agent comprises a compound expressed by

wherein R represents any one of an amide (—NH—CO—), an ester (—CO—O—), an ether (—O—), a sulfide (—S—), a sulfoxide (—SOO—), a hydroxide (—OH), a halide (—F, —Cl, —Br, —I), an imide (—CO—N—CO—), an aza (—N—), an amine (—NH 2 ), an azo (—N═N—), an aldehyde (—CO—H), a carboxy (—CO—), an anhydride (—CO—O—CO—), a urea (—NH—CO—NH—), and a hydrocarbon having a carbon number ranging from 0 to 10.

11 . The alignment material of claim 10 , wherein the hydrocarbon has 6 carbons or less in a main chain thereof.

12 . A liquid crystal display, comprising:

two substrates facing each other;

a liquid crystal layer interposed between the two substrates; and

an alignment layer formed at a top surface of at least one of the two substrates,

wherein the alignment layer is formed by curing an alignment material including:

a solvent;

polymer resin mixed with the solvent to have a weight percent ranging from about 4% to about 8%, the polymer resin including an amic acid monomer having an amino group; and

a cross-linking agent mixed with the solvent to have a weight percent ranging from about 2% to about 20%, the cross-linking agent including a diepoxy group which reacts with the amino group.

13 . The liquid crystal display of claim 12 , wherein a boiling point of the cross-linking agent is lower than a curing temperature of the alignment material.

14 . The liquid crystal display of claim 13 , wherein the cross-linking agent has the boiling point ranging from about 130° C. to about 230° C.

15 . The liquid crystal display of claim 14 , wherein the cross-linking agent has a molecular weight ranging from about 50 to about 200.

16 . The liquid crystal display of claim 15 , wherein the polymer resin has a weight percent ranging from about 5% to about 7%, and the cross-linking agent has a weight percent ranging from about 10% to about 14%.

17 . The liquid crystal display of claim 12 , wherein the solvent comprises at least one selected from the group consisting of γ-butirolactone, ethyleneglycolbutylether, and N-methylpyrrolidone.

18 . The liquid crystal display of claim 12 , wherein the cross-linking agent comprises at least one cyclopentane compound selected from the group expressed by the following chemical formulas:

19 . The liquid crystal display of claim 12 , wherein the cross-linking agent comprises at least one cyclopentene compound selected from the group expressed by the following chemical formulas:

20 . The liquid crystal display of claim 12 , wherein the cross-linking agent comprises at least one cyclohexane compound selected from the group expressed by the following chemical formulas:

21 . The liquid crystal display of claim 12 , wherein the cross-linking agent comprises at least one cyclohexene compound selected from the group expressed by the following chemical formulas:

22 . The liquid crystal display of claim 12 , wherein the cross-linking agent comprises a compound expressed by

wherein R represents any one of an amide (—NH—CO—), an ester (—CO—O—), an ether (—O—), a sulfide (—S—), a sulfoxide (—SOO—), a hydroxide (—OH), a halide (—F, —Cl, —Br, —I), an imide (—CO—N—CO—), an aza (—N—), an amine (—NH 2 ), an azo (—N═N—), an aldehyde (—CO—H), a carboxy (—CO—), an anhydride (—CO—O—CO—), a urea (—NH—CO—NH—), and a hydrocarbon having a carbon number ranging from 0 to 10.

23 . The liquid crystal display of claim 22 , wherein the hydrocarbon has 6 carbons or less in a main chain thereof.

24 . The liquid crystal display of claim 12 , wherein the alignment layer is treated through a rubbing process.