Optical device with antistatic property

Patent metadata

Field	Value
Publication number	US-11111392-B2
Application number	US-201715728321-A
Country	US
Kind code	B2
Filing date	Oct 9, 2017
Priority date	Oct 30, 2009
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

An optical device having a first optical member, a second optical member, and an antistatic layer disposed between the first optical member and the second optical member wherein the antistatic layer contains the reaction product of a mixture comprising at least one polymerizable onium salt having an anion and at least one non-onium polymerizable monomer, oligomer, or polymer.

First claim

What is claimed is:

1. An optical device comprising a first optical member having a front surface, a second optical member, and an antistatic layer disposed between the first optical member and the second optical member wherein the first optical member, the second optical member, and the antistatic layer define an optical path such that light incident to the front surface of the first optical member will pass through each of the first optical member, the second optical member, and the antistatic layer;
wherein the antistatic layer is transparent and has a glass transition temperature of 20° C. or less and is the reaction product of a reaction mixture consisting essentially of photo-initiator, 2 to 90 wt. % of at least one polymerizable onium salt having a fluoroorganic anion, at least one non-onium polymerizable multifunctional (meth)acrylate monomer or oligomer and optionally at least one polymerizable monofunctional (meth)acrylate monomer or oligomer, wherein the onium salt has the formula:
(R 1 ) a-b G+[(CH 2 ) q DR 2 ] b X −

wherein:
each R 1 comprises independently an alkyl, alicyclic, aryl, alkalicyclic, alkaryl, alicyclicalkyl, aralicyclic, or alicyclicaryl moiety, wherein such moiety may comprise one or more heteroatoms such as for example, nitrogen, oxygen, or sulfur, or may comprise phosphorus, or a halogen; R 1 may be cyclic or aromatic and include G + in the cycle;
G is nitrogen, sulfur, or phosphorus;
a is 3 where G is sulfur and a is 4 where G is nitrogen or phosphorous;
b is an integer of 1 to 3 where G is sulfur and b is an integer of 1 to 4 where G is nitrogen or phosphorus;
q is an integer from 1 to 4;
D is oxygen, sulfur, or NR wherein R is H or a lower alkyl of 1 to 4 carbon atoms;
R 2 is a (meth)acryl; and
X − is a fluoroorganic anion which is a methide or an imide.

2. The optical device of claim 1 wherein the onium salt is a quaternary ammonium salt.

3. The optical device of claim 1 wherein the onium salt is selected from the group consisting of ammonium salts, sulfonium salts, and phosphonium salts.

4. The optical device of claim 1 wherein the polymerizable multifunctional (meth)acrylate monomer or oligomer is independently selected from the group consisting of multifunctional (meth)acrylate monomers bearing alkoxylated moieties and polyurethane multi-acrylates and the polymerizable monofunctional (meth)acrylate monomer or oligomer is a monofunctional (meth)acrylate monomer bearing alkoxylated moieties.

5. The optical device of claim 4 wherein the alkoxylated moieties are ethoxylated moieties.

6. The optical device of claim 1 wherein the at least one non-onium polymerizable multifunctional (meth)acrylate monomer or oligomer or the optional at least one non-onium polymerizable monofunctional monomer or oligomer comprises a mixture of at least two polymerizable compounds.

7. The optical device of claim 1 wherein the at least one non-onium polymerizable multifunctional (meth)acrylate monomer or oligomer comprises a mixture of an aliphatic urethane diacrylate and an ethoxylated phenoxy ethyl acrylate.

8. The optical device of claim 1 wherein X − is C(SO 2 CF 3 ) 3 or −N(SO 2 CF 3 ) 2 .

9. The optical device of claim 1 wherein the at least one polymerizable onium salt comprises from 2 to 50% by weight of the reaction mixture.

10. The optical device of claim 1 wherein the glass transition temperature of the antistatic layer is less than 10° C.

11. The optical device of claim 1 wherein the antistatic layer is affixed to at least one of the first optical member and the second optical member.

12. The optical device of claim 1 wherein the antistatic layer is affixed to both the first optical member and the second optical member.

13. The optical device of claim 1 wherein the antistatic layer is affixed to at least one of the first optical member and the second optical member via an intervening layer.

14. The optical device of claim 13 wherein the antistatic layer is affixed to both the first optical member via an intervening layer, and the second optical member via an intervening layer.

15. The optical device of claim 1 wherein the antistatic layer is affixed to either the first optical member or the second optical member, and is also affixed to the remaining optical member via an intervening layer.

16. The optical device of claim 1 exhibiting a charge decay time of less than 10 seconds.

17. The optical device of claim 1 exhibiting a charge decay time of less than 5 seconds.

18. The optical device of claim 1 exhibiting a charge decay time of less than 2 seconds.

19. The optical device of claim 1 wherein the first optical member and the second optical member are independently selected from the group consisting of optical base films, multilayer optical films, diffuse reflecting polarizer films, prismatic brightness enhancement films, arrays of prismatic optical features, arrays of lenticular optical features, and beaded gain diffuser films.

20. The optical device of claim 19 wherein the first optical member comprises an optical base film and the second optical member comprises an array of prismatic optical features.

21. The optical device of claim 19 wherein the first optical member comprises a multilayer optical film and the second optical member comprises a prismatic brightness enhancement film.

22. The optical device of claim 19 wherein the multilayer optical film is a polarizer.

23. The optical device of claim 19 wherein the first optical member comprises a multilayer optical film and the second optical member comprises an array of prismatic optical features.

24. The optical device of claim 23 having an Optical Gain greater than 2.0.

25. The optical device of claim 1 wherein the first optical member comprises an optical base film and the second optical member comprises a prismatic brightness enhancement film.

26. The optical device of claim 25 having an Optical Gain greater than 1.6.

27. The optical device of claim 1 wherein the antistatic layer has a surface texture on one or both sides.

28. The optical device of claim 1 wherein the antistatic layer is greater than 0.25 micron thick.

29. The optical device of claim 1 wherein the antistatic layer is greater than 0.5 micron thick.

30. The optical device of claim 1 wherein the antistatic layer is greater than 1 micron thick.

31. The optical device of claim 1 wherein the charge decay time is lower than that for an optical device which lacks the second optical member but is otherwise identical in all respects.

32. The optical device of claim 1 wherein the charge decay time is lower than that for an optical device which lacks the antistatic layer but is otherwise identical in all respects.

33. An optical device comprising a first optical member having a front surface, a second optical member, and an antistatic layer disposed between the first optical member and the second optical member wherein the first optical member, the second optical member, and the antistatic layer define an optical path such that light incident to the front surface of the first optical member will pass through each of the first optical member, the second optical member, and the antistatic layer;
wherein the antistatic layer is transparent and has a glass transition temperatu

Assignees

• 3M Innovative Properties Co

Inventors

• Klun Thomas P
• Carter Brandt K
• Gerlach Michael K
• Ali Mahfuza B
• Pellerite Mark J
• Snyder Thomas M
• Lamanna William M

Classifications

• C08F220/301

  and one oxygen in the alcohol moiety · CPC title

• C08F222/408

  substituted imides comprising other heteroatoms · CPC title

• C08F222/104

  of tetraalcohols, e.g. pentaerythritol tetra(meth)acrylate · CPC title

• C08F222/103

  of trialcohols, e.g. trimethylolpropane tri(meth)acrylate · CPC title

• C08F222/102

  of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate · CPC title