OPTICALLY CLEAR RESIN COMPOSITION AND DISPLAY DEVICE INCLUDING THE SAME

• US 20160168432A1
• Filed: 07/16/2015
• Published: 06/16/2016
• Est. Priority Date: 12/16/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Cho, Yong Youl, YOU, Jong Sung
• Granted Patent: US 10,446,788 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 2457/20 Displays, e.g. liquid crystal displays, plasma displays
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 2457/204 Plasma displays
• CPC Class Codes: B32B 2457/206 Organic displays, e.g. OLED
• CPC Class Codes: B32B 2457/208 Touch screens
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B32B 7/14 applied in spaced arrangements, e.g. in stripes
• CPC Class Codes: C08G 18/8175 with esters of acrylic or alkylacrylic acid having only one group containing active hydrogen
• CPC Class Codes: C09J 107/00 Adhesives based on natural rubber
• CPC Class Codes: C09J 109/00 Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: C09J 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09J 175/14 Polyurethanes having carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09J 2203/318 for the production of liquid crystal displays
• CPC Class Codes: C09J 4/00 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 Class Codes: C09J 5/06 involving heating of the applied adhesive
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: C09K 2323/05 Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
• CPC Class Codes: H10K 2101/00 Properties of the organic materials covered by group H10K85/00
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/858 : comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 50/868 : Arrangements for polarized light emission H10K50/86 takes precedence
• CPC Class Codes: H10K 59/8722 : Peripheral sealing arrangements, e.g. adhesives, sealants

Abstract

An optically transparent adhesive resin composition includes an ester polymer which contains an ester bond within a repeating unit, a (meth)acrylic ester polymer which contains a (meth)acrylic ester bond within the repeating unit, a rubber polymer, and a crystalline polymer.

Claims

1. An optically transparent adhesive resin composition, comprising:

an ester polymer comprising an ester bond within a repeating unit;

a (meth)acrylic ester polymer comprising a (meth)acrylic ester bond within the repeating unit;

a rubber polymer; and

a crystalline polymer.

2. The optically transparent adhesive resin composition of claim 1, wherein the crystalline polymer comprises at least one of polypropylene, syndiotatic polystyrene, polyamide, polycaprolactone, polycarbonate-diol, polyethylene terephthalate (PET), polyphenylene sulfide, polybutylene terephthalate (PBT), polyarylate (PAR), poly(DPAA), polyether imide (PEI), polyacetal, and polyoxymethylene (POM).

3. The optically transparent adhesive resin composition of claim 1, wherein:

the ester polymer has a molecular weight in the range of 3000 to 6000;

the rubber polymer has a molecular weight in the range of 2000 to 6000; and

the crystalline polymer has a molecular weight in the range of 4000 to 6000.

4. The optically transparent adhesive resin composition of claim 1, wherein:

a content of the ester polymer is in the range of 20 wt % to 40 wt % based on the total weight of the polymer;

a content of the (meth)acrylic ester polymer is in the range of 10 wt % to 35 wt % based on the total weight of the polymer;

a content of the rubber polymer is in the range of 14 wt % to 35 wt % based on the total weight of the polymer; and

a content of the crystalline polymer is in the range of 4 wt % to 53 wt % based on the total weight of the polymer.

5. The optically transparent adhesive resin composition of claim 4, wherein the crystalline polymer is in the range of 30 parts by weight to 150 parts by weight, based on 100 parts by weight of the rubber polymer.

6. A display device, comprising:

a cover window comprising a transparent area and an opaque area disposed outside the transparent area;

a display panel comprising a display area and a peripheral area disposed outside the display area;

a polarizing plate interposed between the display panel and the cover window; and

an optically transparent adhesive resin film comprising a crystalline polymer and configured to cover the polarizing plate and the display panel.

7. The display device of claim 6, wherein the crystalline polymer comprises at least one of polypropylene, syndiotatic polystyrene, polyamide, polycaprolactone, polycarbonate-diol, polyethylene terephthalate (PET), polyphenylene sulfide, polybutylene terephthalate (PBT), polyarylate (PAR), poly(DPAA), polyether imide (PEI), polyacetal, and polyoxymethylene (POM).

8. The display device of claim 6, wherein the optically transparent adhesive resin film has a glass transition temperature (Tg) in the range of 4°

C. to 10°

C.

9. The display device of claim 6, wherein the optically transparent adhesive resin film has modulus in the range of 0.17 Mpa to 0.25 Mpa.

10. The display device of claim 6, wherein the optically transparent adhesive resin film has a shear strength greater than or equal to 300 N/cm² at 25°

C. and has a shear strength greater than or equal to 65 N/cm² at 85°

C.

11. The display device of claim 6, wherein the optically transparent adhesive resin film further comprises a rubber polymer, and a weight ratio of the rubber polymer and the crystalline polymer is in the range of 1:

0.3 to 1;

1.5.

12. The display device of claim 11, wherein the rubber polymer comprises at least one of polybutadiene, polyisoprene, polyneoprene, polyisobutylene, cellulose acetate, and polyvinyl acetate.

13. The display device of claim 11, wherein the rubber polymer has a molecular weight in the range of 2000 to 6000, and the crystalline polymer has a molecular weight in the range of 4000 to 6000.

14. A display device, comprising:

a cover window comprising a transparent area and an opaque area disposed outside the transparent area;

a display panel comprising a display area and a peripheral area disposed outside the display area;

a polarizing plate interposed between the display panel and the cover window; and

an optically transparent adhesive resin film comprising a first area superimposed to overlap the transparent area and a second area superimposed to overlap the opaque area, the first area being different from the second area in crystallinity.

15. The display device of claim 14, wherein the first area of the optically transparent resin film has different optical characteristics than the second area of the optically transparent resin film.

16. The display device of claim 15, wherein the first area of the optically transparent resin film has a different refractive index than the second area of the optically transparent resin film.

17. The display device of claim 15, wherein the first area of the optically transparent resin film has a different optical transmittance than the second area of the optically transparent resin film.

18. The display device of claim 14, wherein the optically transparent resin film is continuous in the first area of the optically transparent resin film.

19. The display device of claim 18, wherein an air pocket is present in the second area of the optically transparent resin film.

20. The display device of claim 14, wherein the second area of the optically transparent resin film comprises a curved surface that is recessed toward the first area the optically transparent resin film.