KOC SOLUTION CO LTD
KOC SOLUTION CO LTD Patent applications | ||
Patent application number | Title | Published |
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20150226879 | METHOD OF MANUFACTURING THIOURETHANE - BASED OPTICAL MATERIAL - 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. | 08-13-2015 |
20140039145 | METHOD OF PRODUCING RESIN FOR THIOURETHANE-BASED OPTICAL MATERIAL USING GENERAL-PURPOSE POLYISOCYANATE COMPOUND, RESIN COMPOSITION FOR THIOURETHANE-BASED OPTICAL MATERIAL AND THIOURETHANE-BASED OPTICAL MATERIAL INCLUDING RESIN PRODUCED BY THE METHOD - Disclosed is a method of producing a high-quality thiourethane-based optical material using a general-purpose polyisocyanate compound. According to the method, the pH of a polythiol compound is adjusted to 3.1 to 7 to prevent the occurrence of whitening, which is a problem of the prior art arising from the dissolution of a pressure-sensitive adhesive from a pressure-sensitive adhesive tape upon lens casting. The pH adjustment increases the reaction rate of a resin composition including the polythiol compound. The use of the polythiol compound whose pH is adjusted enables the production of a thiourethane-based optical material that does not suffer from whitening at the edges of the optical lens and nonuniformity polymerization. Further disclosed are a resin composition for a thiourethane-based optical material, and an optical material including a resin produced by the method. | 02-06-2014 |