| http://www.w3.org/ns/prov#value | - For the production of the polythiourethane optical material of the present invention, a variety of substances such as a chain extender, a cross-linking agent, a light stabilizer, an ultraviolet absorber, an anti-oxidant, an anti-coloring agent, an oil-soluble dye, filler, an adhesion improving agent or the like may be added, depending on the purpose, as in the known molding methods.
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