Cross-linkable composition

1. A cross-linkable composition, comprising:

an acrylic pressure-sensitive adhesive resin;

a crosslinking agent for the acrylic pressure-sensitive adhesive resin;

an ionic compound; and

a polyalkylene polyol compound,

wherein a binding energy (A) between the acrylic pressure-sensitive adhesive resin and the polyalkylene polyol compound is lower than a binding energy (B) between the crosslinking agent and the acrylic pressure-sensitive adhesive resin,

a difference (B-A) between the binding energy (B) between the crosslinking agent and the acrylic pressure-sensitive adhesive resin and the binding energy (A) between the acrylic pressure-sensitive adhesive resin and the polyalkylene polyol compound is 2 Kcal/mol or more, and

a mixing energy of the ionic compound with respect to an ethylene oxide unit is −2 Kcal/mol or more,

wherein the polyalkylene polyol compound is represented by the following Formula 1 and wherein the polyalkylene polyol compound has a weight average molecular weight of 30,000 or less:

(HO n A B) m   [Formula 1]

where A is a core including a polyalkylene oxide unit, B is a chain represented by the following Formula 2, m is an integer of 1 or more, n is an integer of 0 or more, and the sum (m+n) of m and n is 3 or more:

where A 1 to A 3 each independently represent an alkylene group, Q 1 and Q 2 represent an aliphatic or aromatic divalent residue, L 1 to L 4 represent linkers, x is an integer of 1 or more, y is an integer of 0 or more, and z is an integer of 1 or more.

2. The cross-linkable composition of claim 1 , wherein the difference (B-A) between the binding energy (B) between the crosslinking agent and the acrylic pressure-sensitive adhesive resin and the binding energy (A) between the acrylic pressure-sensitive adhesive resin and the polyalkylene polyol compound is 20 Kcal/mol or less.

3. The cross-linkable composition of claim 1 , wherein the binding energy (B) between the crosslinking agent and the acrylic pressure-sensitive adhesive resin is −7 Kcal/mol or more.

4. The cross-linkable composition of claim 1 , wherein the binding energy (A) between the acrylic pressure-sensitive adhesive resin and the polyalkylene polyol compound is less than −7 Kcal/mol.

5. The cross-linkable composition of claim 1 , wherein the acrylic pressure-sensitive adhesive resin is an acrylic pressure-sensitive adhesive resin having a carboxyl group.

6. The cross-linkable composition of claim 1 , wherein the acrylic pressure-sensitive adhesive resin has an acid value of 20 or more.

7. The cross-linkable composition of claim 1 , wherein the crosslinking agent is an epoxy crosslinking agent or an aziridine crosslinking agent.

8. The cross-linkable composition of claim 1 , wherein the ionic compound has an octanol-water partition coefficient of 4 or more.

9. The cross-linkable composition of claim 1 , wherein the ionic compound includes a cation having a cation-water binding energy in a range of 0 to 0.6 Kcal/mol.

10. The cross-linkable composition of claim 1 , wherein the ionic compound includes a cation of the following Formula 7:

where R 1 represents an alkyl group having 1 to 3 carbon atoms, and R 2 to R 4 each independently represent an alkyl group having 4 to 20 carbon atoms.

11. The cross-linkable composition of claim 1 , wherein the ionic compound includes an anion of the following Formula 8:

[X(YO m R f ) n ] −   [Formula 8]

where X represents a nitrogen atom or a carbon atom, Y represents a carbon atom or a sulfur atom, R f represents a perfluoroalkyl group, m is 1 or 2 and n is 2 or 3.

12. The cross-linkable composition of claim 1 , wherein the polyalkylene polyol compound includes 3 or more hydroxyl groups, and has a weight average molecular weight of 10,000 or more.

13. The cross-linkable composition of claim 1 , wherein the polyalkylene polyol compound includes an ethylene oxide unit or a propylene oxide unit.

14. A pressure-sensitive adhesive optical member for an image display device, comprising a pressure-sensitive adhesive layer containing a pressure-sensitive adhesive composition and formed on one or both surfaces of the pressure-sensitive adhesive optical member for an image display device,

wherein the pressure-sensitive adhesive composition includes an ionic liquid and a polymer with a glass transition temperature of 0° C. or less as a base polymer,

the polymer with a glass transition temperature of 0° C. or less is an acrylic polymer having a monomer which includes one or more (meth)acrylates with an alkyl group having 1 to 14 carbon atoms in an amount of 50 to 100 wt % as a main component, and has an acid value of 29 or less,

the pressure-sensitive adhesive composition further includes a crosslinking agent for the base polymer; and a polyalkylene polyol compound,

a binding energy (A) between the base polymer and the polyalkylene polyol compound is lower than a binding energy (B) between the crosslinking agent and the base polymer,

a difference (B-A) between the binding energy (B) between the crosslinking agent and the base polymer and the binding energy (A) between the base polymer and the polyalkylene polyol compound is 2 Kcal/mol or more, and

a mixing energy of the ionic liquid with respect to an ethylene oxide unit is −2 Kcal/mol or more,

wherein the polyalkylene polyol compound is represented by the following Formula 1 wherein the polyalkylene polyol compound has a weight average molecular weight of 30,000 or less:

(HO n A B) m   [Formula 1]

where A is a core including a polyalkylene oxide unit, B is a chain represented by the following Formula 2, m is an integer of 1 or more, n is an integer of 0 or more, and the sum (m+n) of m and n is 3 or more:

where A 1 to A 3 each independently represent an alkylene group, Q 1 and Q 2 represent an aliphatic or aromatic divalent residue, L 1 to L 4 represent linkers, x is an integer of 1 or more, y is an integer of 0 or more, and z is an integer of 1 or more.

15. An image display device, comprising the pressure-sensitive adhesive optical member of claim 14 .