Optical adhesive for liquid crystal display

1. A liquid crystal display comprising first and second opposing substrates having first and second opposing surfaces, respectively, at least one of the surfaces having a metal disposed thereon, the substrates bonded together with an adhesive in contact with the metal, the adhesive comprising a blend of:

a pressure sensitive adhesive component comprising at least one polymer having acid or base functionality,

a high Tg polymer having a weight average molecular weight greater than 100,000 and having an acid or base functionality, and

a crosslinker,

wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed.

2. The liquid crystal display of claim 1 , wherein the first and second substrates comprise polymeric substrates, glass, or a combination thereof.

3. The liquid crystal display of claim 1 , wherein the metal comprises indium tin oxide.

4. The liquid crystal display of claim 1 , wherein the adhesive has a thickness of from about 1.5 to about 200 um.

5. The liquid crystal display of claim 1 , wherein the pressure sensitive adhesive component has a weight average molecular weight of less than about 800,000 and is formed from free-radically polymerizable monomers selected from the group consisting of (meth)acrylates, vinyl monomers, and mixtures thereof.

6. The liquid crystal display of claim 1 , wherein the pressure sensitive adhesive component comprises from about 70 to about 90 wt. % of the adhesive.

7. The liquid crystal display of claim 1 , wherein the high Tg polymer has a Tg greater than about 20° C.

8. The liquid crystal display of claim 1 , wherein the high Tg polymer has a Tg greater than about 50° C.

9. The liquid crystal display of claim 1 , wherein the high Tg polymer comprises a monomer selected from the group consisting of vinyl esters, (meth)acrylamide, styrenes, (meth)acrylonitriles, substituted styrenes, vinyl halides, vinyl propionate, (meth)acrylates, and mixtures thereof.

10. The liquid crystal display of claim 1 , wherein the high Tg polymer comprises a basic copolymer.

11. The liquid crystal display of claim 1 , wherein the high Tg polymer comprises a domain size of less than about 100 nm.

12. The liquid crystal display of claim 1 , wherein the crosslinker is selected from the group consisting of multifunctional aziridines, peroxides, benzophenones, triazines, monoethylenically unsaturated mono-, di-, and trialkoxy silane compounds, diacrylates, triacrylates, and tetraacrylates, isocyanates, epoxies, and mixtures thereof.

13. The liquid crystal display of claim 1 , wherein the first and second opposing substrates are separated by a cell gap, and the cell gap comprises a liquid crystal composition.

14. The liquid crystal display of claim 13 , wherein the liquid crystal composition comprises a cholesteric liquid crystal composition.

15. The liquid crystal display of claim 13 , wherein the liquid crystal composition is photocurable or thermally curable.

16. The liquid crystal display of claim 13 , wherein the liquid crystal composition comprises a prepolymer composition, the prepolymer composition comprising:

a silane-containing (meth)acrylate monomer, and

a multifunctional (meth)acrylate monomer.

17. The liquid crystal display of claim 13 , wherein the liquid crystal composition comprises a prepolymer composition, the prepolymer composition comprising:

a silane-containing (meth)acrylate monomer,

a (meth)acrylic resin monomer, and

a multifunctional (meth)acrylate monomer.

18. The liquid crystal display of claim 13 , wherein the liquid crystal composition is photocured or thermally cured.

19. The liquid crystal display of claim 13 , wherein the liquid crystal composition comprises the cured reaction product of a prepolymer composition, the prepolymer composition comprising:

a silane-containing (meth)acrylate monomer, and

a multifunctional (meth)acrylate monomer.

20. The liquid crystal display of claim 13 , wherein the liquid crystal composition comprises the cured reaction product of a prepolymer composition, the prepolymer composition comprising:

a silane-containing (meth)acrylate monomer,

a (meth)acrylic resin monomer, and

a multifunctional (meth)acrylate monomer.

21. The liquid crystal display of claim 13 , wherein the liquid crystal composition comprises particles having a diameter of from about 1.5 to about 10 um.

22. A method of manufacturing a liquid crystal display, comprising:

providing first and second substrates having first and second surfaces, respectively, at least one of the surfaces having a metal disposed thereon;

providing a pressure sensitive adhesive component comprising at least one polymer having acid or base functionality, a high Tg polymer having a weight average molecular weight greater than 100,000 and having an acid or base functionality, and a crosslinker, wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed; and

bonding the first and second substrates together using an adhesive, wherein the adhesive is in contact with the metal.

23. The method of claim 22 , wherein the adhesive is in the form of a layer, the layer having a plurality of features on an outer surface thereof.

24. The method of claim 22 , wherein the first and second substrates are separated by a cell gap, and the method further comprises disposing a liquid crystal composition into the cell gap.

25. A liquid crystal display assembly comprising:

two light reflecting liquid crystal displays of different color, wherein at least one of the displays comprises the liquid crystal display of claim 1 .