Curable compositions for display devices

• US 20040225025A1
• Filed: 02/02/2004
• Published: 11/11/2004
• Est. Priority Date: 08/03/2001
• Status: Abandoned Application

• Current Assignee: JSR Corporation
• Original Assignee: JSR Corporation
• Inventors: Chawla, Chander Prakash, Sullivan, Michael G.
• Application Number:
  US10/768,697
• Publication Number:
  US 20040225025A1
• Time in Patent Office: Days
• US Class Current: 522/71
• CPC Class Codes: C08G 59/62 Alcohols or phenols
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/8722 Peripheral sealing arrangements, e.g. adhesives, sealants

Abstract

Provided are curable compositions for the preparation of displays. The compositions are particularly suitable as adhesives, sealants, and/or encapsulants for displays. Compositions according to the invention include those having an epoxy resin and a hydroxy-functional compound, wherein the compositions provide good barrier properties after cure.

Claims

1. A curable composition for displays, said composition comprising:

(i) an epoxy resin; and

(ii) a hydroxy-functional compound;

wherein said composition has substantial resistance to yellowing.

2. A curable composition for displays, said composition comprising:

(i) an epoxy resin; and

(ii) a hydroxy-functional compound;

wherein said composition has a ratio of epoxy equivalents to hydroxy equivalents of at least 1.5

5. The composition of claim 2, wherein said composition is an adhesive, sealant, and/or encapsulant for displays.

6. The composition of claim 2, wherein said epoxy resin is selected from the group consisting of cycloaliphatic epoxy resins, epoxy novolacs, and epoxy bisphenols.

7. The composition of claim 2, wherein said epoxy resin comprises at least two cyclohexene oxide structures.

8. The composition of claim 2, wherein said hydroxy-functional compound is a polyol.

9. The composition of claim 2, wherein said hydroxy-functional component is selected from the group consisting of polyester polyols, polyols comprising one or more caprolactone residues, and C₁-C₁₀ glycols.

10. The composition of claim 2, wherein said epoxy resin and said polyol make up, relative to the total weight of said composition, at least 70 wt % of said composition.

11. The composition of claim 2, wherein said epoxy resin and said polyol make up, relative to the total weight of said adhesive, at least 90 wt % of the adhesive.

12. The composition of claim 2, wherein said composition has a ratio of epoxy equivalents to hydroxy equivalents of at least 1.8.

13. The composition of claim 2, wherein said composition further comprises a silane adhesion promoter.

14. The composition according to claim 13, wherein said adhesion promoter is an epoxy-functional silane adhesion promoter.

15. The composition according to claim 13, wherein said adhesion promoter is a 3-glycidoxypropyltrimethoxysilane adhesion promoter.

16. The composition of claim 2, wherein said composition comprises, relative to the total weight of said composition, 0-5 wt % of free radically polymerizable components.

17. The composition of claim 2, wherein said composition is absent free radically polymerizable components.

18. The composition of claim 2, wherein said composition comprises, relative to the total weight of said composition, 0-5 wt % of components selected from the group consisting of acrylate-functional components, methacrylate-functional components, and allyl-functional components.

19. The composition of claim 2, wherein said composition is absent a free radical photointiator.

20. The composition of claim 2, wherein said composition comprises a cationic photoinitiator.

21. The composition of claim 2, wherein said composition comprises an antioxidant.

22. The composition of claim 2, wherein said composition comprises silicon dioxide.

23. The composition of claim 2, wherein said composition comprises a nanoclay.

28. The composition of claim 2, wherein said composition, after cure, has a water vapor transmission of less than 10 g/hr·

m².

29. The composition of claim 2, wherein said composition, after cure, has a water vapor transmission of less than 1.5 g/hr·

m².

30. The composition of claim 2, wherein said composition, after cure, has a water vapor permeance of less than 0.06 g/Pa·

hr·

m².

31. The composition of claim 2, wherein said composition, after cure, has a water vapor permeance of less than 0.01 g/Pa·

hr·

m².

32. The composition of claim 21, wherein said composition, after cure, has an adhesion to glass of at least 20 g/in.

33. The composition of claim 2, wherein said composition, after cure, has a hardness of at least H.

35. A process for preparing a display, said process comprising curing the composition of claim 2.

36. A liquid crystal display prepared by the process of claim 35.

37. An organic light emitting diode display prepared by the process of claim 35.

38. A computer, television, camera, watch, calculator, cell phone, telephone, pager, palm pilot, or stereo comprising a display prepared by the process of claim 35.

3. A curable composition for displays, said composition comprising:

(i) an epoxy resin;

(ii) a hydroxy-functional compound; and

(iii) 0-30 wt % of free radically polymerizable components.

4. A curable composition for displays, said composition comprising:

(i) an epoxy resin;

(ii) a hydroxy-functional compound; and

(iii) at least one compound selected from the group consisting of nanoclays and silicon dioxide.

24. A composition for displays, said composition consisting essentially of:

(i) one or more epoxy resins;

(ii) one or more hydroxyfunctional components;

(iii) one or more adhesion promoters;

(iv) one or more cationic photoinitiators;

(v) one or more antioxidants; and

(vi) optionally one or more components selected from the group consisting of silicon dioxide and nanoclays.

25. The composition of claim 24, wherein said one or more epoxy resins includes an epoxy resin selected from the group consisting of cycloaliphatic epoxy resins, epoxy novolacs, and epoxy bisphenols.

26. The composition of claim 24, wherein said one or more hydroxyfunctional components consist essentially of one or more polyols.

27. The composition of claim 24, wherein said one or more adhesion promoters include an epoxy-functional silane adhesion promoter.

34. A curable composition for displays, said composition having substantial resistance to yellowing and, after cure, the following combination of properties:

(a) a water vapor transmission of less than 5 g/hr·

m²;

(b) water vapor permeance of less than 0.01 g/Pa·

hr·

m²;

(c) an adhesion to glass of at least 40 g/in; and

(d) a hardness of at least H.