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US 2020/0377452 A1Published application
Method for producing polythiol compound, method for producing curable composition, and method for producing cured product
AssigneeHoya Lens Thailand Ltd.
InventorYukio KAGEYAMA
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Abstract
A method for producing a polythiol compound includes reacting a polyol compound with thiourea in which a content of ammonium thiocyanate is 0.05% by mass or less to obtain an isothiuronium salt.
Claims7
A method for producing a polythiol compound, the method comprising:
- reacting a halide represented by the following Formula (1) with an alkali metal compound selected from the group consisting of an alkali metal sulfide and an alkali metal hydroxide to obtain a polyol compound selected from the group consisting of a polyol compound represented by Formula (2) and a polyol compound represented by Formula (3),
- in Formula (1), X represents a halogen atom,
- reacting the polyol compound with thiourea to obtain an isothiuronium salt;
- hydrolyzing the isothiuronium salt to obtain a polythiol salt;
- and
- converting the polythiol salt into a polythiol to obtain one or more polythiol compounds selected from the group consisting of a polythiol compound represented by Formula (4), a polythiol compound represented by Formula (5), a polythiol compound represented by Formula (6), and a polythiol compound represented by Formula (7),
- wherein a content of ammonium thiocyanate in the thiourea is 0.05% by mass or less.
4 more elements
Dependencies are inferred from the claim text.