METHOD OF MANUFACTURING THIOURETHANE - BASED OPTICAL MATERIAL
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Aug 29, 2013
filing date -
Aug 29, 2012
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Abandoned
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Abstract
Disclosed is a method of preparing a thiourethane based optical material In particular, a method of preparing a high-quality optical material, which is colorless and transparent and is not deformed, at a high yield without generation of striae, whitening, and microbubbles is disclosed. A method of preparing the thiourethane based optical material according to present invention is characterized in that, before cast polymerization, a polymerizable composition including a polythiol compound and a polyisocyanate compound is treated at a specific vacuum condition and then injected into a mold. A thiourethane based optical material prepared according to the present invention may be widely used in a variety of fields as a substitute of conventional optical materials.
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