Film-Like composition containing a sorbent

• US 20090054232A1
• Filed: 05/10/2005
• Published: 02/26/2009
• Est. Priority Date: 05/18/2004
• Status: Abandoned Application

• Current Assignee: Sud-Chemie AG (Clariant AG)
• Original Assignee: Sud-Chemie AG (Clariant AG)
• Inventors: Kramer, Inge, Dick, Stefan, Erdmann, Mandy
• Application Number:
  US11/596,692
• Publication Number:
  US 20090054232A1
• Time in Patent Office: Days
• US Class Current: 502/402
• CPC Class Codes: B01D 2253/106 Silica or silicates
• CPC Class Codes: B01D 53/261 by adsorption
• CPC Class Codes: B01D 53/28 Selection of materials for use as drying agents
• CPC Class Codes: B01J 20/12 Naturally occurring clays or bleaching earth
• CPC Class Codes: B01J 20/183 Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation
• CPC Class Codes: B01J 20/28033 Membrane, sheet, cloth, pad, lamellar or mat
• CPC Class Codes: B01J 2220/42 Materials comprising a mixture of inorganic materials materials coated or impregnated on a carrier B01J20/32
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity

Abstract

The present invention relates to a film-like uncompressed composition, in particular for moisture-sensitive electronic components or devices, comprising at least one sorbent (component A); at least one natural or synthetic sheet silicate (component B); and, if desired, a liquid phase (component C), in particular water. Furthermore, a process for producing such a composition and its use are described.

Claims

1. A film-like composition, in particular for moisture-sensitive electronic components or devices, comprising:

a) at least one sorbent (component A);

b) at least one natural or synthetic sheet silicate (component B); and

c) optionally a liquid phase (component C),

where the composition has not been pressed or compressed.

2. The film-like composition according to claim 1, characterized in that the sorbent is an inorganic sorbent.

3. The film-like composition according to claim 1, characterized in that components A, B and C are present in the following weight ratios:

a) component A;

from 20 to 35 parts by weight,

b) component B;

from 5 to 8 parts by weight,

c) component C;

from 80 to 120 parts by weight.

4. The film-like composition according to claim 1, characterized in that the components A, B and C are present in the following weight ratios:

a) component A;

from 20 to 50 parts by weight,

b) component B;

from 0.1 to 5 parts by weight,

c) component C;

from 80 to 120 parts by weight.

5. The film-like composition according to claim 1, characterized in that the natural or synthetic sheet silicate comprises a smectitic clay, such as bentonite or hectorite.

6. The film-like composition according to claim 5, characterized in that the smectitic clay comprises a sodium-containing bentonite or a synthetic hectorite.

7. The film-like composition according to claim 1, characterized in that the natural or synthetic sheet silicate has a swellability of at least 15 ml/2 g.

8. The film-like composition according to claim 1 further comprising additional components selected from the group consisting of fluidizers, sintering aids, rheological additives, pigments and preservatives and mixtures thereof.

9. The film-like composition according to claim 1, further comprising a rheological additive selected from a sheet silicate, such as hectorite, a precipitated silica, a pyrogenic silica, and mixtures thereof.

10. The film-like composition according to claim 1, further comprising up to 10% by weight of a glass solder.

11. The film-like composition according to claim 1, further comprising up to 1% by weight of water glass, based on the amount of sorbent used.

12. The film-like composition according to claim 1, further comprising up to 10% by weight sodium borate, based on the amount of sorbent used.

13. The film-like composition according to claim 1, characterized in that the film-like composition has a thickness in the range from 1 μ

m to 10 mm.

14. A composition comprising the film-like composition according to claim 1 applied to a substrate or a surface or adhered thereto, without use of a separate adhesive.

15. The composition of claim 14 wherein the substrate or the surface is selected from the group consisting of a metal, a plastic and a glass.

16. The film-like composition of claim 1, characterized in that its mean pore diameter is in the range from about 3 to 15 nm, determined as the pore size average pore diameter (4V/A by BET).

24. An electronic device or component, such as an electroluminescent component, such as an OLED display, containing the film-like composition according to claim 1.

17. (canceled)

18. A process for producing a sorbent-containing film which comprises the following steps:

a) preparation of a mixture of at least one sorbent, a natural or synthetic sheet silicate and a liquid phase in the form of a suspension having a viscosity in the range from 10 to 7000 mPas, at a shear rate of 100 s<sup>−

1</sup>;

b) application of the suspension to a substrate or a surface to form a film;

c) solidification of the film on the substrate, and

d) activation of the sorbent in the solidified film.

19. The process according to claim 18, characterized in that its viscosity is in the range from 100 to 1000 mPas, at a shear rate of 100 s⁻

1.

20. The process according to claim 18, characterized in that the application of the suspension to the substrate is carried out by a process selected from spin coating, spraying on or spray coating, painting, casting, doctor blade coating, printing processes, such as screen printing, and dip coating.

21. The process according to claim 18, characterized in that the natural or synthetic sheet silicate is added as the last component in the preparation of the mixture.

22. The process according to claim 18 further comprising activating the sorbent at a temperature of at least about 200°

C., for a period of time from 0.5 to 10 hours.

23. The process according to claim 18, characterized in that the substrate or the surface is brought to an elevated temperature in the range from 50 to 95°

C., prior to application of the suspension.

25. (canceled)

26. (canceled)

27. A film-like composition, in particular for moisture-sensitive electronic components or devices, comprising:

a) at least one sorbent (component A);

b) at least one natural or synthetic sheet silicate (component B); and

c) optionally, a liquid phase (component C), where the composition has not been pressed or compressed and wherein the composition does not contain any organic solvent or binder.

28. The film-like composition of claim 27 wherein the composition does not contain any organic components.