| abstract |
The present invention,n n n (a) at least one compound selected from the group consisting of isocyanate compounds, isothiocyanate compounds, and isocyanate group-containing isothiocyanate compounds;n n n (b) at least one active hydrogen compound selected from the group consisting of a hydroxy compound, a mercapto compound and a mercapto group-containing hydroxy compound;n n n (c) tertiary amines having no electron withdrawing groups; Andn n n (d) a composition of a urethane-based plastic lens composed of a Lewis acid capable of forming a complex or a salt with the tertiary amine under conditions other than dibutyltin, dibutyltin diacetate, or ditintin octosan; The present invention provides a method for manufacturing the urethane-based plastic lens comprising the step of heat curing the composition, the composition is a long life of the port life and can produce an optically uniform plastic lens in a short time. |