Method for producing polythiol compound, polymerizable composition for optical material, and uses thereof
US-2015133692-A1 · May 14, 2015 · US
Polythiol composition and method for producing same
US10207987B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10207987-B2 |
| Application number | US-201515310279-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 15, 2015 |
| Priority date | Jul 18, 2014 |
| Publication date | Feb 19, 2019 |
| Grant date | Feb 19, 2019 |
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- Title
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Abstract
Official abstract text for this publication.
The present invention provides a polythiol composition containing, as the main component, a polythiol compound (a) having two or more mercapto groups, and containing 0.5% by mass or less of a nitrogen-containing compound (b) in which at least one mercapto group in the polythiol compound (a) is substituted with a group represented by formula (1).
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a polythiol composition, the method comprising purifying a polythiol composition containing, as the main component, a polythiol compound (a) having two or more mercapto groups, and containing more than 0.5% by mass of a nitrogen-containing compound (b) in which at least one mercapto group in the polythiol compound (a) is substituted with a group represented by formula (1) below: to produce a polythiol composition containing 0.01% by mass to 0.5% by mass of the nitrogen-containing compound (b), wherein the purifying process has at least: a process (1) of distilling the polythiol composition; and a process (2) of purifying the polythiol composition by water washing and/or acid washing, wherein the process (2) is carried out after the process (1). 2. The method for producing a polythiol composition according to claim 1 , wherein the process (2) is further carried out before the process (1). 3. A method for producing a polythiol composition, the method comprising purifying a polythiol composition containing, as the main component, a polythiol compound (a) having two or more mercapto groups, and containing more than 0.5% by mass of a nitrogen-containing compound (b) in which at least one mercapto group in the polythiol compound (a) is substituted with a group represented by formula (1) below: to produce a polythiol composition containing 0.01% by mass to 0.5% by mass of the nitrogen-containing compound (b), wherein the purifying process has a process of washing the polythiol composition containing more than 0.5% by mass of the nitrogen-containing compound (b) with 6N or more of an acid.
Assignees
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Classifications
of an acyclic saturated carbon skeleton · CPC title
of a saturated carbon skeleton containing rings · CPC title
- C07C319/28Primary
Separation; Purification · CPC title
of an unsaturated carbon skeleton containing rings · CPC title
from mercapto compounds or metallic derivatives thereof (C08G75/0204 takes precedence) · CPC title
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- What does patent US10207987B2 cover?
- The present invention provides a polythiol composition containing, as the main component, a polythiol compound (a) having two or more mercapto groups, and containing 0.5% by mass or less of a nitrogen-containing compound (b) in which at least one mercapto group in the polythiol compound (a) is substituted with a group represented by formula (1).
- Who is the assignee on this patent?
- Mitsubishi Gas Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification C07C319/28. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 19 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).