Curable composition and optical material

Patent metadata

Field	Value
Publication number	US-12371533-B2
Application number	US-202017613001-A
Country	US
Kind code	B2
Filing date	Oct 26, 2020
Priority date	Oct 31, 2019
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A curable composition for forming a high refractive index optical material, the curable composition comprising an episulfide compound; sulfur-containing organic particles comprising a specific content of sulfur atoms; and a reducing agent, and an optical material comprising the curable composition.

First claim

What is claimed is:

1. A curable composition for forming a high refractive index optical material, the curable composition comprising
an episulfide compound;
sulfur-containing organic particles comprising 60 to 80 wt % of sulfur atoms; and
a reducing agent,
wherein the sulfur-containing organic particles comprising 60 to 80 wt % of sulfur atoms comprise repeat units represented by the following Chemical Formula 1:

in Chemical Formula 1,
n is an integer of 1 to 10, and
m is an integer of 1 to 1000.

2. The curable composition according to claim 1 ,
wherein the weight ratio of the episulfide compound to the sulfur-containing organic particles comprising 60 to 80 wt % of sulfur atoms is 1:0.01 to 0.5.

3. The curable composition according to claim 1 ,
wherein the sulfur-containing organic particles comprising 60 to 80 wt % of sulfur atoms have particle diameters of 20 to 300 nm.

4. The curable composition according to claim 1 ,
wherein the episulfide compound is represented by the following Chemical Formula 2:

in Chemical Formula 2,
R 1 and R 2 are each independently hydrogen or C1-C10 alkyl,
R 3 and R 4 are each independently a single bond or C1-C10 alkylene,
a is an integer of 0 to 4, and
b is an integer of 0 to 6.

5. The curable composition according to claim 1 ,
wherein the episulfide compound comprises at least one selected from the group consisting of bis(β-epithiopropyl) sulfide, bis(β-epithiopropyl) disulfide, bis(β-epithiopropylthio) methane, 1,2-bis(β-epithiopropylthio) ethane, 1,3-bis(β-epithiopropylthio) propane, and 1,4-bis(β-epithiopropylthio) butane.

6. The curable composition according to claim 1 ,
wherein the reducing agent is included in the amount of 0.1 to 15 wt %, based on 100 wt % of the total curable composition.

7. The curable composition according to claim 1 ,
wherein the reducing agent comprises at least one selected from the group consisting of triphenylphosphine (PPh 3 ), tris(2-carboxylethyl) phosphine (TCEP), 1,4-dimercaptobutane-2,3-diol (DTT), tris(3-hydroxypropyl)phosphine (THPP), beta-mercaptoethanol (BME) and dithiobutylamine (DTBA).

Assignees

• Lg Chemical Ltd

Inventors

• Choi Hee Jung
• Lim Jeewoo
• Kim Heon
• Seo Donghwa
• Chang Yeongrae

Classifications

• G02B1/041 Primary

  Lenses · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• C08G75/0272

  using other sulfur sources · CPC title

• C08G75/045

  from mercapto compounds and unsaturated compounds · CPC title

• C08L81/02

  Polythioethers; Polythioether-ethers · CPC title