Resin composition and display device including adhesive layer formed from the same

Patent metadata

Field	Value
Publication number	US-11739236-B2
Application number	US-202117406567-A
Country	US
Kind code	B2
Filing date	Aug 19, 2021
Priority date	Jan 7, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A resin composition includes a first (meth)acrylate monomer a second (meth)acrylate monomer containing an oxy group or a divalent alkyl group, a urethane (meth)acrylate oligomer, and at least one photoinitiator. A content of the first (meth)acrylate monomer is about 1.6 to about 4.7 times greater than a content of the urethane (meth)acrylate oligomer.

First claim

What is claimed is:

1. A resin composition comprising:
a first (meth)acrylate monomer represented by Formula 1;
a second (meth)acrylate monomer containing a substituted or unsubstituted oxy group or a substituted or unsubstituted divalent alkyl group having 4 to 18 carbon atoms;
a urethane (meth)acrylate oligomer; and
at least one photoinitiator,
wherein a content of the first (meth)acrylate monomer is about 1.6 to about 4.7 times greater than a content of the urethane (meth)acrylate oligomer,

wherein, in Formula 1,
R 1 is a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms,
R 2 is a substituted or unsubstituted divalent alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted divalent alkenyl group having 2 to 10 carbon atoms, a divalent alkenyl group including an ether bond and having 2 to 10 carbon atoms, or a substituted or unsubstituted divalent alkynyl group having 2 to 10 carbon atoms, and
R 3 and R 4 are each independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 ring-forming carbon atoms.

2. The resin composition of claim 1 , wherein the resin composition has a viscosity in a range of about 5 cP to about 50 cP at about 25° C. as measured according to JIS K 7117-2 method.

3. The resin composition of claim 1 , wherein the content of the first (meth)acrylate monomer is in a range of about 25 wt % to about 70 wt % with respect to a total content of the resin composition.

4. The resin composition of claim 1 , wherein the content of the urethane (meth)acrylate oligomer is in a range of about 5 wt % to about 30 wt % with respect to a total content of the resin composition.

5. The resin composition of claim 1 , wherein
a content of the second (meth)acrylate monomer is in a range of about 15 wt % to about 60 wt % with respect to a total content of the resin composition, and
a content of the at least one photoinitiator is in a range of about 0.5 wt % to about 5 wt % with respect to the total content of the resin composition.

6. The resin composition of claim 1 , wherein the resin composition has a storage elastic modulus at about −20° C. in a range of about 1 to about 10 times greater than a storage elastic modulus at about 60° C. after being UV cured.

7. The resin composition of claim 1 , wherein the resin composition has a storage elastic modulus in a range of about 1.0×10 3 Pa to about 1.0×10 6 Pa at about 25° C. after being UV cured.

8. The resin composition of claim 1 , wherein the second (meth)acrylate monomer comprises at least one of n-butyl (meth)acrylate, n-hexyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl acrylate, isodecyl (meth)acrylate, ethoxy diethyleneglycol acrylate, or 2-ethylhexyl-diglycol acrylate.

9. A display device comprising:
a display module including a display panel;
a window disposed on the display panel; and
an adhesive layer disposed between the display panel and the window,
wherein the adhesive layer comprises a polymer derived from a resin composition including:
a first (meth)acrylate monomer represented by Formula 1;
a second (meth)acrylate monomer containing a substituted or unsubstituted oxy group or a substituted or unsubstituted divalent alkyl group having 4 to 18 carbon atoms;
a urethane (meth)acrylate oligomer; and
at least one photoinitiator; and

a content of the first (meth)acrylate monomer is about 1.6 to about 4.7 times greater than a content of the urethane (meth)acrylate oligomer,

wherein, in Formula 1,
R 1 is a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms,
R 2 is a substituted or unsubstituted divalent alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted divalent alkenyl group having 2 to 10 carbon atoms, a divalent alkenyl group including an ether bond and having 2 to 10 carbon atoms, or a substituted or unsubstituted divalent alkynyl group having 2 to 10 carbon atoms, and
R 3 and R 4 are each independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 ring-forming carbon atoms.

10. The display device of claim 9 , wherein
the resin composition is directly disposed on a surface of the window or a surface of the display module, and
the adhesive layer is formed by UV curing the resin composition.

11. The display device of claim 9 , wherein
the content of the first (meth)acrylate monomer is in a range of about 25 wt % to about 70 wt %, and
the content of the urethane (meth)acrylate oligomer is in a range of about 5 wt % to about 30 wt % with respect to a total content of the resin composition.

12. The display device of claim 9 , wherein
a content of the second (meth)acrylate monomer is in a range of about 15 wt % to about 60 wt %, and
a content of the at least one photoinitiator is in a range of about 0.5 wt % to about 5 wt % with respect to a total content of the resin composition.

13. The display device of claim 9 , wherein the adhesive layer has a thickness in a range of about 10 μm to about 200 μm.

14. The display device of claim 9 , wherein the adhesive layer has a storage elastic modulus at about −20° C. in a range of about 1 to about 10 times greater than a storage elastic modulus at about 60° C.

15. The display device of claim 9 , wherein the adhesive layer has a storage elastic modulus in a range of about 1.0×10 3 Pa to about 1.0×10 6 Pa at about 25° C.

16. The display device of claim 9 , further comprising:
at least one folding area,
wherein the at least one folding area has a radius of curvature of about 5 mm or less.

17. The display device of claim 9 , further comprising:
an input sensing unit disposed on the display panel,
wherein the adhesive layer is disposed between the display panel and the input sensing unit or disposed between the input sensing unit and the window.

18. The display device of claim 17 , wherein
the display panel comprises:
a display element layer; and
an encapsulation layer disposed on the display element layer, and

the input sensing unit is directly disposed on the encapsulation layer, and the adhesive layer is disposed on the input sensing unit.

19. The display device of claim 9 , further comprising:
a light control layer disposed between the adhesive layer and the window; and
an optical adhesive layer disposed between the light control layer and the window,
wherein the optical adhesive layer comprises a polymer derived from the resin composition.

20. The display device of claim 19 , wherein the optical adhesive layer has a storage elastic modulus in a range of about 1.0×10 3 Pa to about 1.0×10 6 Pa at about 25° C.

Assignees

• Samsung Display Co Ltd

Inventors

• Morita Keisuke

Classifications

• H10K59/873

  Encapsulations · CPC title

• C09J7/385 Primary

  Acrylic polymers · CPC title

• C09J4/00 Primary

  Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} · CPC title

• H10K50/844

  Encapsulations · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title