Process for producing resin for optical material
AssigneeMitsui Chemicals, Inc.
InventorsMasaru Kawaguchi, Shigetoshi Kuma, Mamoru Tanaka, Seiichi Kobayashi
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Abstract
Disclosed is a process for producing effectively a high performance optical material (e.g. a lens) made of a polyurethane resin, which is transparent and colorless without a strain. In this process, the optical material is produced without causing striation or clouding by polymerizing a polymerizable composition comprising a polythiol compound and a polyiso(thio)cyanate compound, and characterized in that a water content in the composition is 10 to 300 ppm.
Claims7
A process for producing a resin for an optical material by polymerizing a polymerizable composition comprising a polythiol compound and a polyiso(thio)cyanate compound, characterized in that a water content in the composition is 10 to 300 ppm, wherein prior to the polymerization a water content in the polythiol compound is 20 to 600 ppm.
Dependencies are inferred from the claim text.