Polythiol composition and method for producing same
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYoshihiko Nishimori, Kazuya Zenyoji, Rie Sakata, Teruo Kamura
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Abstract
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).
Claims3
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).
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.
Dependencies are inferred from the claim text.