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US 10,308,756 B2Granted
Polymerizable composition for optical material and use thereof
AssigneeMitsui Chemicals, Inc.
InventorNobuo Kawato
Life of this patent
Estimating the term…
Abstract
Provided is a polymerizable composition for an optical material including (A) an amine having two or more secondary amino groups, (B) an isocyanate having two or more isocyanato groups, and (C) a thiol having three or more mercapto groups, in which the ratio (a/b) of the molar number a of amino groups in the amine (A) with respect to the molar number b of isocyanato groups in the isocyanate (B) is in the range of 0.10 to 0.60.
Claims15
A polymerizable composition for an optical material, comprising:
- a prepolymer obtained by reacting (A) an amine having two or more secondary amino groups and (B) an isocyanate having two or more isocyanato groups;
- and (C) a thiol having three or more mercapto groups,
- wherein the ratio (a/b) of the molar number a of amino groups in the amine (A) with respect to the molar number b of isocyanato groups in the isocyanate (B) is in the range of 0.10 to 0.60.
A method for producing a polymerizable composition for an optical material, comprising:
- a step (i) of reacting an amine (A) and an isocyanate (B) to obtain a prepolymer;
- and
- a step (ii) of adding and mixing a thiol (C) into the prepolymer,
- wherein the ratio (a/b) of the molar number a of amino groups in the amine (A) with respect to the molar number b of isocyanato groups in the isocyanate (B) is in the range of 0.10 to 0.60.
1 more element
Dependencies are inferred from the claim text.