Binder composition, epoxy-based cured product formed therefrom, and light emitting layer containing epoxy-based cured product

Inventors: Tae Young Choi (Gwacheon-si, KR); Keum Hwan Park (Seongnam-si, KR); Young Min Kim (Seongnam-si, KR); Young Eun Kim (Hanam-si, KR); Ji Young Kim (Seoul, KR)

Assignees: Hyundai Motor Company; Kia Corporation; Korea Electronics Technology Institute

C08G59/226 C08G59/245 C08G59/66 C08G59/686 C08J5/18 C08K3/30 C09K11/02 C09K11/612 C08J2363/02 C08K2003/3036

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Quick Facts

Patent No.: US 12,668,658
App. No.: 18/503,651
Granted: Jun 30, 2026
Kind: B2

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Abstract

In embodiment, a binder composition includes a multifunctional compound containing three or more functional groups, a first bifunctional epoxy resin, and a second bifunctional epoxy resin. The second bifunctional epoxy resin can have a weight average molecular weight greater than a weight average molecular weight of the first bifunctional epoxy resin, and a mass ratio of the first bifunctional epoxy resin and the second bifunctional epoxy resin is in a range from 0.45:1 to 7.0:1. In an embodiment, an epoxy-based cured product includes such binder composition. And in an embodiment, a light emitting layer includes such epoxy-based cured product.

Claims (28)

1 . A binder composition comprising:

a multifunctional compound containing three or more functional groups;

a first bifunctional epoxy resin; and

a second bifunctional epoxy resin having a weight average molecular weight greater than a weight average molecular weight of the first bifunctional epoxy resin, wherein a mass ratio of the first bifunctional epoxy resin and the second bifunctional epoxy resin is in a range from 0.45:1 to 7.0:1.

2 . The composition of claim 1 , wherein the weight average molecular weight of the first bifunctional epoxy resin is in a range from 200 to 700 g/mol.

3 . The composition of claim 1 , wherein the weight average molecular weight of the second bifunctional epoxy resin is in a range from 100,000 to 350,000 g/mol.

4 . The composition of claim 1 , wherein each of the first bifunctional epoxy resin and the second bifunctional epoxy resin independently comprises an epoxy group at each of both distal ends of a polymer.

5 . The composition of claim 1 , wherein each of the first bifunctional epoxy resin and the second bifunctional epoxy resin independently comprises at least one selected from a group consisting of a bisphenol-type epoxy resin, an aromatic amine-type epoxy resin, and an alicyclic epoxy resin.

6 . The composition of claim 5 , wherein one or both of the first bifunctional epoxy resin and the second bifunctional epoxy resin is a homopolymer.

7 . The composition of claim 1 , wherein the functional group of the multifunctional compound is crosslinked with an epoxy group contained in one or both of the first bifunctional epoxy resin and the second bifunctional epoxy resin, to form an epoxy resin crosslinked product.

8 . The composition of claim 1 , wherein the multifunctional compound is a thiol-based compound.

9 . The composition of claim 8 , wherein the multifunctional compound comprises at least one compound selected from a group consisting of trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetrakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptopropionate), tris-[(3-mercaptopropionyloxy)-ethyl]-isocyanurate, tris(3-mercaptopropyl) isocyanurate, octyl thioglycolate, ethylene glycol bisthioglycolate, trimethylolpropane tris(thioglycolate), pentaerythritol tetrakis(thioglycolate), 3-mercaptopropionic acid, pentaerythritol tetrakis(3-mercaptobutyrate), 1,4-bis(3-mercaptobutyryloxy) butane, 1,3,5-tris(3-mercaptobutyryloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, trimethylolpropane tris(3-mercaptobutylate), and trimethylolethane tris(3-mercaptobutyrate).

10 . The composition of claim 1 , further comprising a cross-linking catalyst.

11 . The composition of claim 10 , wherein the cross-linking catalyst comprises an amine-based compound or an imidazole-based compound.

12 . An epoxy-based cured product comprising:

wherein the first bifunctional epoxy resin and the second bifunctional epoxy resin are connected to each other via crosslinking by a multifunctional compound containing three or more functional groups, and

wherein a mass ratio of the first bifunctional epoxy resin and the second bifunctional epoxy resin is in a range from 0.45:1 to 7.0:1.

13 . The product of claim 12 , wherein the crosslinking is formed by a crosslinking reaction between an epoxy group included in one of or any combination of the first bifunctional epoxy resin, the second bifunctional epoxy resin, and the functional group contained in the multifunctional compound.

14 . The product of claim 12 , wherein each of the first bifunctional epoxy resin and the second bifunctional epoxy resin independently comprises an epoxy group at each of both distal ends of a polymer.

15 . The product of claim 12 , wherein the multifunctional compound is a thiol-based compound.

16 . A light emitting layer comprising:

an epoxy resin crosslinked product comprising a first bifunctional epoxy resin and a second bifunctional epoxy resin, the second bifunctional epoxy resin having a weight average molecular weight greater than a weight average molecular weight of the first bifunctional epoxy resin, wherein the first bifunctional epoxy resin and the second bifunctional epoxy resin are connected to each other via crosslinking by a multifunctional compound containing three or more functional groups; and

light emitting particles, wherein a mass ratio of the first bifunctional epoxy resin and the second bifunctional epoxy resin is in a range from 0.45:1 to 7.0:1.

17 . The layer of claim 16 , wherein the light emitting particles are dispersed in a matrix of the epoxy resin crosslinked product.

18 . The layer of claim 16 , wherein the crosslinking is formed by a crosslinking reaction between an epoxy group included in one of or any combination of the first bifunctional epoxy resin, the second bifunctional epoxy resin, and the functional group contained in the multifunctional compound.

19 . The layer of claim 16 , wherein each of the first bifunctional epoxy resin and the second bifunctional epoxy resin independently comprises an epoxy group at each of both distal ends of a polymer.

20 . The layer of claim 16 , wherein the multifunctional compound is a thiol-based compound.