# US 10,766,996 B2 · Method for producing polythiol compound, method for producing curable composition, and method for producing cured product

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,766,996 B2
- Document ID: US10766996B2
- Status: Granted
- Kind: B2
- Application number: 16/015,670
- Filed: 2018-06-22
- Published: 2018-12-20
- Granted: 2020-09-08
- Earliest claimed: 2016-08-05
- Assignees: Hoya Lens Thailand Ltd.
- Applicants: Hoya Lens Thailand Ltd.
- Inventors: Yukio Kageyama; Masahisa Kousaka; Tomofumi Ohnishi
- Web page: https://patentgrep.com/patent/US10766996B2

## CPC

- C08G 18/3876: {containing mercapto groups}
- C07C 319/14: of sulfides
- C07C 319/22: of hydropolysulfides or polysulfides
- C07C 321/14: of an acyclic saturated carbon skeleton
- C08G 18/7642: {containing at least two isocyanate or isothiocyanate groups linked to the aromatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate groups, e.g. xylylene diisocyanate or homologues substituted on the aromatic ring}
- G02B 1/041: {Lenses}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Provided is a method for producing a polythiol compound, including reacting 2-mercaptoethanol with an epihalohydrin, wherein the reaction is carried out in the presence of a halide selected from the group consisting of a 2,3-dihalogeno-1-propanol and an allyl halide, and an amount of the halide in the reaction is more than 0.50% by mass and 10.00% by mass or less with respect to the total amount of the halide and the epihalohydrin. Also provided are a method for producing a curable composition, including producing a polythiol compound by the abovementioned production method, and a method for producing a cured product, including producing a curable composition by the abovementioned production method.

## Claims

### Claim 1

A method for producing a polythiol compound, comprising reacting 2-mercaptoethanol with an epihalohydrin, wherein
the reaction is carried out in the presence of a halide selected from the group consisting of a 2,3-dihalogeno-1-propanol and an allyl halide, and
an amount of the halide in the reaction is 0.60% by mass or more and 10.00% by mass or less with respect to the total amount of the halide and the epihalohydrin.

### Claim 2 (depends on 1)

The method for producing a polythiol compound according to claim 1, wherein one or more polythiol compounds selected from the group consisting of a polythiol compound represented by Formula (3) below, a polythiol compound represented by Formula (4) below, and a polythiol compound represented by Formula (5) below is produced.

### Claim 3 (depends on 1)

The method for producing a polythiol compound according to claim 1, wherein a polythiol compound represented by Formula (7) below is produced.

### Claim 4 (depends on 1)

The method for producing a polythiol compound according to claim 1, wherein an amount of the halide in the reaction is 0.70% by mass or more and 10.00% by mass or less with respect to the total amount of the halide and the epihalohydrin.

### Claim 5 (depends on 1)

The method for producing a polythiol compound according to claim 1, wherein an amount of the halide in the reaction is 0.80% by mass or more and 10.00% by mass or less with respect to the total amount of the halide and the epihalohydrin.