Nanoparticle filled barrier adhesive compositions

Patent metadata

Field	Value
Publication number	US-10894903-B2
Application number	US-201716309812-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Jun 16, 2016
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A barrier adhesive composition comprises polyisobutylene resin, hydrophobic nanoparticles and sorbent nanoparticles.

First claim

We claim:

1. A barrier adhesive composition comprising:
(a) polyisobutylene resin;
(b) hydrophobic nanoparticles having an average primary or agglomerate particle size diameter of no greater than about 100 nanometers; and
(c) sorbent nanoparticles
wherein at least 70% of the nanoparticles are present as discrete unagglomerated nanoparticles and the barrier adhesive composition is a pressure sensitive adhesive.

2. The barrier adhesive composition of claim 1 wherein the hydrophobic nanoparticles are surface modified.

3. The barrier adhesive composition of claim 1 wherein the hydrophobic nanoparticles comprise surface modified metal oxide nanoparticles.

4. The barrier adhesive composition of claim 1 wherein the hydrophobic nanoparticles are treated with a silane or a carboxylic acid.

5. The barrier adhesive composition of claim 3 wherein the hydrophobic nanoparticles comprise surface modified nanosilica.

6. The barrier adhesive composition of claim 5 wherein the hydrophobic surface modified nanoparticles comprise nanosilica treated with an organosilane, wherein the organosilane comprises an alkyl group.

7. The barrier adhesive composition of claim 1 wherein the hydrophobic nanoparticles have an average particle size of about 3 nm to about 30 nm.

8. The barrier adhesive composition of claim 1 wherein the sorbent nanoparticles comprise metal oxide.

9. The barrier adhesive composition of claim 8 wherein the sorbent nanoparticles comprise calcium oxide.

10. The barrier adhesive composition of claim 9 wherein the calcium oxide has an average particle size of no greater than about 200 nm.

11. The barrier adhesive composition of claim 1 wherein the resin system comprises a polyisobutylene resin having a viscosity average molecular weight of about 40,000 to about 2,600,000 g/mol.

12. The barrier adhesive composition of claim 11 wherein the resin system comprises a polyisobutylene resin having a viscosity average molecular weight of about 300,000 to about 900,000 g/mol.

13. The barrier adhesive composition of claim 1 comprising about 1 to about 10 wt. % of the hydrophobic nanoparticles relative to the total weight of the composition.

14. The barrier adhesive composition of claim 13 comprising about 2 to about 5 wt. % of the hydrophobic nanoparticles relative to the total weight of the composition.

15. The barrier adhesive composition of claim 1 comprising about 0.5 to about 10 wt. % of the sorbent nanoparticles relative to the total weight of the composition.

16. The barrier adhesive composition of claim 15 comprising about 1 to about 5 wt. % of the sorbent nanoparticles relative to the total weight of the composition.

17. The barrier adhesive composition of claim 1 further comprising solvent.

18. The barrier adhesive composition of claim 1 further comprising an ultraviolet blocker.

19. The barrier adhesive composition of claim 1 further comprising tackifier.

20. The barrier adhesive composition of claim 1 wherein the polyisobutylene resin comprises isobutylene copolymer.

21. The barrier adhesive composition of claim 20 wherein the polyisobutylene resin comprises butyl rubber.

22. A barrier adhesive composition comprising:
(a) about 50 to about 75 wt. % polyisobutylene resin having a viscosity average molecular weight of about 300,000 to about 900,000 g/mol,
(b) about 1 to about 10 wt. % hydrophobic surface modified nanosilica,
(c) about 1 to about 5 wt. % calcium oxide nanoparticles,
(d) about 10 to about 25 wt. % tackifier, and
all relative to the total weight of the composition;
wherein the barrier adhesive composition is a pressure sensitive adhesive having optical transmittance of at least about 90%.

23. An adhesive barrier film comprising a layer of the barrier adhesive composition of claim 1 disposed on a gas-barrier film.

24. The adhesive barrier film of claim 23 wherein the gas-barrier film has an oxygen transmission rate less than about 0.005 cc/m 2 /day at 23° C. and 90% RH and a water vapor transmission rate of less than about 0.005 g/m2/day at 23° C. and 90% RH.

25. The adhesive barrier film of claim 24 wherein the gas-barrier film is a multilayer film comprising an inorganic visible light-transmissive layer disposed between polymer layers.

26. The adhesive barrier film of claim 23 further comprising a substrate disposed on the gas-barrier film opposite the layer of the barrier adhesive composition.

27. The adhesive barrier film of claim 26 wherein the substrate comprises polyethylene terephthalate.

28. The adhesive barrier film of claim 23 further comprising a release layer disposed on the layer of the barrier adhesive composition opposite the gas-barrier film.

29. An encapsulated organic electronic device comprising the barrier adhesive composition of claim 1 encapsulating a thin film device.

30. The encapsulated organic electronic device of claim 29 wherein the device is an OLED.

31. An encapsulated touch sensor comprising the barrier adhesive composition of claim 1 encapsulating a touch sensor.

32. A barrier adhesive article comprising a layer of the barrier adhesive composition of claim 1 disposed between release layers.

Assignees

• 3M Innovative Properties Co

Inventors

• Johnson Jacob P
• Baran Jr Jimmie R
• Baetzold John P
• Schleusner Serena L

Classifications

• C09J7/383 Primary

  Natural or synthetic rubber · CPC title

• B01J20/041 Primary

  Oxides or hydroxides · CPC title

• C09J2467/006

  in the substrate · CPC title

• C08K9/06

  with silicon-containing compounds · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title