Method of producing pentaerythritol mercaptocarboxylate, polymerizable composition, resin, optical material, and spectacle lens
AssigneeHoya Lens Thailand Ltd.
InventorMasahisa KOUSAKA
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Abstract
A method of producing pentaerythritol mercaptocarboxylate includes subjecting pentaerythritol and mercaptocarboxylic acid to a dehydration reaction, wherein the pentaerythritol has an absorbance of 0.1 or more at a wavelength of 270 nm in an aqueous solution containing 5 mass % of the pentaerythritol measured in a quartz cell with an optical path length of 50 mm. A polymerizable composition contains the pentaerythritol mercaptocarboxylate. A resin is a cured product of the polymerizable composition. An optical material contains the resin. A spectacle lens contains the resin.
Claims15
A method of producing pentaerythritol mercaptocarboxylate, comprising
- subjecting pentaerythritol and mercaptocarboxylic acid to a dehydration reaction,
- wherein the pentaerythritol has an absorbance of 0.1 or more at a wavelength of 270 nm in an aqueous solution containing 5 mass % of the pentaerythritol measured in a quartz cell with an optical path length of 50 mm.
Dependencies are inferred from the claim text.