Polymerizable composition for optical material, polymerizable prepolymer composition for optical material, cured product, and method of producing optical material

Abstract

A polymerizable composition for an optical material containing two or more different monomers for an optical material, and a polymerization catalyst, in which at least one of the two or more different monomers for an optical material is an isocyanate compound containing no aromatic rings, a content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from more than 0.05 parts by mass to 2.0 parts by mass, and a viscosity measured by a B-type viscometer at 25° C. and 60 rpm is from 10 mPa·s to 1,000 mPa·s.

1 . A cured product of two or more different optical monomers for an optical material, wherein:
 at least one of the two or more different monomers for an optical material is an isocyanate compound containing no aromatic rings,   there are no striae of a length of 1.0 mm or more within a radius of 15 mm from a center of the cured product,   the cured product includes amine, and   an amine content, as measured by gas chromatography mass spectrometry, is from 0.03% by mass to 2.5% by mass.   
     
     
         2 . The cured product according to  claim 1 , wherein the two or more different monomers for an optical material contain at least one active hydrogen compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. 
     
     
         3 . The cured product according to  claim 1 , wherein:
 the amine is a polymerization catalyst,   the cured product is obtained by polymerizing the two or more different optical monomers in the presence of the amine, and   the amine satisfies the following Condition 1.
   −Ea/R is from −7,100 to −2,900.  [Condition1]
 
   wherein Ea is an activation energy calculated by an Arrhenius plot from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J/mol/K   
     
     
         4 . The cured product according to  claim 1 , wherein the amine has a pKa value of from 4 to 8. 
     
     
         5 . The cured product according to  claim 1 , wherein the amine at least one selected from the group consisting of 3,5-lutidine, 2,4,6-collidine, triethylenediamine, N,N-dimethylethanolamine, and N-ethylmorpholine.