Laminated film, and display device including same

Patent metadata

Field	Value
Publication number	US-11014342-B2
Application number	US-201816027870-A
Country	US
Kind code	B2
Filing date	Jul 5, 2018
Priority date	Jul 7, 2017
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A laminated film including a first film; and a second film disposed on the first film, wherein a tensile modulus of the second film is greater than or equal to a tensile modulus of the first film, and a transmittance of the first film is greater than or equal to a transmittance of the second film, provided that at least one of the tensile modulus of the first film and the tensile modulus of the second film are not equal or the transmittance of the first film and the transmittance of the second film are not equal.

First claim

What is claimed is:

1. A laminated film, comprising:
a first film; and
a second film disposed on the first film;
wherein a tensile modulus of the second film is greater than or equal to a tensile modulus of the first film, and
a transmittance of the first film is greater than or equal to a transmittance of the second film,
provided that at least one of the tensile modulus of the first film and the tensile modulus of the second film are not equal, or the transmittance of the first film and the transmittance of the second film are not equal, and
wherein the first film comprises a polyimide comprising a structural unit represented by Chemical Formula 1, and a poly(amide-imide) copolymer comprising a structural unit represented by Chemical Formula 1 and a structural unit represented by Chemical Formula 2, and
the second film comprises a polyimide comprising a structural unit represented by Chemical Formula 1, and a poly(amide-imide) copolymer comprising a structural unit represented by Chemical Formula 1 and a structural unit represented by Chemical Formula 2,
wherein the polyimide of the first film and the polyimide of the second film are the same or different,
wherein the poly(amide-imide) copolymer of the first film and the poly(amide-imide) copolymer of the second film are the same or different, and
the poly(amide-imide) copolymer of the first film and the poly(amide-imide) copolymer of the second film each independently comprises:
about 20 mol % to about 70 mol % of at least one structural unit represented by Chemical Formula 1 based on a total amount of structural units of the poly(amide-imide) copolymer, and
about 30 mol % to about 70 mol % of at least one structural unit represented by Chemical Formula 2 based on the total amount of structural units of the poly(amide-imide) copolymer:

wherein, in Chemical Formula 1,
D is a substituted or unsubstituted tetravalent C6 to C24 aliphatic cyclic group, a substituted or unsubstituted tetravalent C6 to C24 aromatic ring group, or a substituted or unsubstituted tetravalent C4 to C24 heteroaromatic ring group, wherein the aliphatic cyclic group, the aromatic ring group, or the heteroaromatic ring group is present as a single ring, a condensed ring system comprising two or more fused rings, or two or more moieties independently selected from the single ring and the condensed ring system that are linked by a single bond, —O—, —S—, —C(═O)—, —CH(OH 3 )—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p —, —(CF 2 ) q —, —C(C n H 2n+1 ) 2 —, —C(C n F 2n+1 ) 2 —, —(CH 2 ) p —C(C n H 2n+1 ) 2 —(CH 2 ) q —, —(CH 2 ) p —C(C n F 2n+1 ) 2 —(CH 2 ) q —, —C(CF 3 )(C 6 H 5 )—, or —C(═O)NH—,
E is a substituted or unsubstituted C1 to C30 alkylene group, a substituted or unsubstituted C2 to C30 alkenylene group, a substituted or unsubstituted C1 to C30 alkynylene group, a substituted or unsubstituted divalent C6 to C24 aliphatic cyclic group, a substituted or unsubstituted divalent C6 to C24 aromatic ring group, or a substituted or unsubstituted divalent C4 to C24 heteroaromatic ring group, wherein the aliphatic cyclic group, the aromatic ring group, or the heteroaromatic ring group is present as a single ring, a condensed ring system comprising two or more fused rings, or two or more moieties independently selected from the single ring and the condensed ring system that are linked by a single bond, a fluorenylene group, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p —, —(CF 2 ) q —, —C(C n H 2n+1 ) 2 —, —C(C n F 2n+1 ) 2 —, —(CH 2 ) p —C(C n H 2n+1 ) 2 —(CH 2 ) q —, or —(CH 2 ) p —C(C n F 2n+1 ) 2 —(CH 2 ) q —, —C(CF 3 )(C 6 H 5 )—, or —C(═O)NH—, and
1≤n<10, 1≤p≤10, and 1≤q≤10,

wherein, in Chemical Formula 2,
each of A and B′ are independently a substituted or unsubstituted C1 to C30 alkylene group, a substituted or unsubstituted C2 to C30 alkenylene group, a substituted or unsubstituted C1 to C30 alkynylene group, a substituted or unsubstituted divalent C6 to C24 aliphatic cyclic group, a substituted or unsubstituted divalent C6 to C24 aromatic ring group, or a substituted or unsubstituted divalent C4 to C24 heteroaromatic ring group, wherein the aliphatic cyclic group, the aromatic ring group, or the heteroaromatic ring group is present as a single ring, a condensed ring system comprising two or more fused rings, or two or more moieties independently selected from the single ring and the condensed ring system that are linked by a single bond, a fluorenylene group, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p —, —(CF 2 ) q —, —C(C n H 2n+1 ) 2 —, —C(C n F 2n+1 ) 2 —, —(CH 2 ) p —C(C n H 2n+1 ) 2 —(CH 2 ) q —, —(CH 2 ) p —C(C n F 2n+1 ) 2 —(CH 2 ) q —, —C(CF 3 )(C 6 H 5 )—, or —C(═O)NH—, and wherein 1≤n≤10, 1≤p≤10, and 1≤q≤10.

2. The laminated film of claim 1 , wherein the tensile modulus of the second film is greater than or equal to about 5 gigapascals, when measured according to an ASTM D882 standard.

3. The laminated film of claim 1 , wherein the transmittance of the first film is greater than or equal to about 89%, when obtained from Y(D65).

4. The laminated film of claim 1 , wherein the transmittance of the second film is greater than or equal to about 88%, when measured obtained from Y(D65).

5. The laminated film of claim 1 , wherein the tensile modulus of the first film is greater than or equal to about 4 gigapascals, when measured according to an ASTM D882 standard.

6. The laminated film of claim 1 , wherein a refractive index of the second film is greater than a refractive index of the first film.

7. The laminated film of claim 1 , wherein the laminated film further comprises a hard coating layer disposed on the second film on a side opposite the first film.

8. The laminated film of claim 1 , wherein the laminated film further comprises a back coating layer disposed on the first film on a side opposite the second film.

9. The laminated film of claim 1 , wherein the laminated film further comprises an adhesive layer or a hyperelastic layer disposed between the first film and the second film.

10. The laminated film of claim 9 , wherein the laminated film further comprises a second back coating layer disposed between the second film and the adhesive layer or the hyperelastic layer.

11. The laminated film of claim 9 , wherein the laminated film further comprises a primer coating layer disposed between the first film and the adhesive layer or the hyperelastic layer.

12. The laminated film of claim 7 , wherein the hard coating layer comprises a (meth)acrylate polymer, a polycaprolactone, a urethane-(meth)acrylate copolymer, a polyrotaxane, an epoxy resin, an organosilicon material, an inorganic hard coating material, or a combination thereof.

13. The laminated film of claim 1 , wherein each of a thickness of the first film and a thickness of the second film is independently about 10 micrometers to about 100 micrometers.

14. The laminated film of claim 9 , wherein a thickness of the adhesive layer or a thickness of the hyperelastic layer is less than or equal to about 50 micrometers.

15. The laminated film of claim 1 , wherein the first film further comprises a polyamide, polyethylene terephthalate, polyethylene naphthalate, a polycarbonate, triacetyl cellulose, or a combination thereof.

16. The laminated film of claim 1 , wherein D of Chemical Formula 1 is a moiety selecte

Assignees

• Samsung Electronics Co Ltd
• Samsung Sdi Co Ltd

Inventors

• Song Sun Jin
• Seo Seoung Jin
• Ju Kyeong-Sik
• Chae Jungha

Classifications

• G09F9/301

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• G02B1/10 Primary

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title

• C08G73/14

  Polyamide-imides · CPC title

• B32B27/34

  comprising polyamides · CPC title