POLYMERIZABLE COMPOSITIONS COMPRISING NANOPARTICLES

• US 20060204679A1
• Filed: 03/10/2006
• Published: 09/14/2006
• Est. Priority Date: 03/11/2005
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Goenner, Emily S., Jones, Clinton L., Kolb, Brant U., Olson, David B.
• Application Number:
  US11/276,692
• Publication Number:
  US 20060204679A1
• Time in Patent Office: Days
• US Class Current: 428/1.300
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C08J 2333/06 of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C08J 5/005 Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 33/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

Presently described are microstructured articles such as a brightness enhancing film or optical turning film comprising a polymerized structure comprising the reaction product of a polymerizable composition comprising an (A) organic component comprising

• (i) at least one monofunctional acrylic monomer selected from t-alkyl (meth)acrylates, N-substituted or N,N-disubstituted (meth)acrylamides, and C_1-8 primary or secondary alkyl (meth)acrylate; (ii) at least one multifunctional (meth)acrylate or (meth)acrylamide monomer; (iii) optionally, at least one oligomeric (meth)acrylate; and (iv) at least one photoinitiator; and (B) at least 10 wt-% inorganic nanoparticles.

Claims

1. A brightness enhancing film comprising:

a brightness enhancing polymerized structure comprising the reaction product of a polymerizable composition comprising an

(A) organic component comprising

(i) at least one monofunctional acrylic monomer selected from t-alkyl (meth)acrylates, N-substituted or N,N-disubstituted (meth)acrylamides, and C_1-8 primary or secondary alkyl (meth)acrylate;

(ii) at least one multifunctional (meth)acrylate or (meth)acrylamide monomer;

(iii) optionally, at least one oligomeric (meth)acrylate; and

(iv) at least one photoinitiator; and

(B) at least 10 wt-% inorganic nanoparticles.

2. The brightness enhancing film of claim 1 wherein the organic component has a glass transition temperature of at least 35°

C.

3. The brightness enhancing film of claim 1 wherein the organic component has a glass transition temperature of at least 40°

C.

4. The brightness enhancing film of claim 1 wherein the organic component is free from carbocyclic and heterocyclic polymerizable moieties.

5. The brightness enhancing film according to claim 1 wherein the at least one monofunctional acrylic monomer is t-butyl (meth)acrylate.

6. The brightness enhancing film according to claim 1 wherein the at least one monofunctional acrylic monomer comprises a N-substituted or N,N-disubstituted (meth)acrylamide.

7. The brightness enhancing film according to claim 6 wherein the at least one monofunctional acrylic monomer comprises N-isopropylacrylamide, N-t-butylacrylamide, N,N-dimethylacrylamide or N,N-diethylacrylamide.

8. The brightness enhancing film according to claim 1 wherein the at least one monofunctional acrylic monomer comprises at least one C_1-8 primary or secondary alkyl (meth)acrylate.

9. The brightness enhancing film according to claim 8 wherein the C_1-8 primary or secondary alkyl (meth)acrylate is methyl acrylate, methyl methacrylate, ethyl acrylate, 1-propyl acrylate or a 2-(N-butylcarbamyl)ethyl (meth)acrylate.

10. The brightness enhancing film according to claim 1 wherein the multifunctional (meth)acrylate or (meth)acrylamide is at least one polyol poly(meth)acrylate.

11. The brightness enhancing film according to claim 10 wherein the multifunctional (meth)acrylate or (meth)acrylamide is ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 2-ethyl-2-hydroxymethyl- 1,3-prop anediol tri(meth)acrylate, di(trimethylolpropane) tetra(meth)acrylate or pentaerythritol tetra(meth)acrylate.

12. The brightness enhancing film according to claim 1 wherein the multifunctional (meth)acrylate or (meth)acrylamide is at least one N,N′

-alkylenebisacrylamide.

13. The brightness enhancing film according to claim 12 wherein the multifunctional (meth)acrylate or (meth)acrylamide is N,N′

-methylenebisacrylamide.

14. The brightness enhancing film according to claim 1 wherein the organic component comprises at least one oligomeric (meth)acrylate.

15. The brightness enhancing film according to claim 14 wherein the at least one oligomeric (meth)acrylate is an oligomeric polyether (meth)acrylate having a glass transition temperature of at most 23°

C.

16. The brightness enhancing film according to claim 15 wherein the oligomeric polyether (meth)acrylate is a di(meth)acrylate of a polyester polyol or an oligomer thereof.

17. The brightness enhancing film according to claim 15 wherein the oligomeric polyether (meth)acrylate is poly(ethylene glycol) di(meth)acrylate or poly(propylene glycol) di(meth)acrylate.

18. The brightness enhancing film according to claim 1 wherein the oligomeric (meth)acrylate is an oligomeric urethane di(meth)acrylate.

19. An brightness enhancing film according to claim 18 wherein the oligomeric urethane di(meth)acrylate is a reaction product of 2,2,4-trimethylhexane 1,6-diisocyanate, polycaprolactone diol and 2-hydroxyethyl methacrylate.

20. The brightness enhancing film according to claim 1 wherein the monofunctional acrylic monomer(s) constitutes about 10-98% by weight based on total organic component.