Polymerizable composition for optical material, optical material, and method for producing optical material
AssigneeMitsui Chemicals, Inc.
InventorsAkinori Ryu, Seiichi Kobayashi
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Abstract
A polymerizable composition for an optical material containing tolylene diisocyanate, an aliphatic polyisocyanate having 4 to 8 carbon atoms and one or more polythiols selected from pentaerythritol tetrakismercaptoacetate and pentaerythritol tetrakismercaptopropionate, is provided.
Claims12
A polymerizable composition which when polymerized forms a material with optical properties, said polymerizable composition comprising tolylene diisocyanate, an aliphatic polyisocyanate having 4 to 8 carbon atoms and one or more polythiols selected from pentaerythritol tetrakismercaptoacetate and pentaerythritol tetrakismercaptopropionate, wherein the molar ratio (NCO+NCS)/(SH+OH) of the functional groups of isocyanate and any isothiocyanate compounds to polythiols and any active hydrogen compounds is in the range of 0.8 to 1.5.
Dependencies are inferred from the claim text.