Patent application number | Description | Published |
20130303721 | METHOD FOR MANUFACTURING RESIN FOR URETHANE-BASED OPTICAL MATERIAL, RESIN COMPOSITION FOR SAME, AND OPTICAL MATERIAL MANUFACTURED THEREBY - A method of preparing an optical material by polymerizing a resin composition including a thiol group-containing compound and an isocyanate group-containing compound, particularly, a method of preparing a high-quality urethane-based optical material using a universal polyisocyanate compound. According to one aspect, a resin composition including a polythiol compound and a widely available polyisocyanate compound, as main components, and having a moisture content of 300 to 3,000 ppm is template-polymerized to prepare the optical material. A colorless, transparent, and high-quality urethane-based optical material may be efficiently prepared in high yield using a low-cost and widely available isocyanate compound through template-polymerization using a tape while minimizing generation of white tape residues and foaming. | 11-14-2013 |
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 |
20140106015 | COMPOSITION CONTAINING HEAT-TREATED POWDER OR EXTRACT OF GLYCINE SOJA AS ACTIVE GRADIENT FOR PREVENTION AND TREATMENT OF DIABETES MELLITUS AND DIABETIC COMPLICATIONS - The present invention relates to a composition for the prevention and treatment of diabetes mellitus and diabetic complications. The composition includes as an active ingredient, a heat-treated powder or extract of | 04-17-2014 |
20140336332 | METHOD FOR PREPARING THIOEPOXY-BASED OPTICAL MATERIAL AND POLYMERIZABLE COMPOSITION THEREOF - The present invention relates to a thioepoxy compound for an optical material, a polymerizable composition including the thioepoxy compound, and a method for producing a thioepoxy optical material by polymerization of the polymerizable composition. The polymerizable composition further includes 4.1 to 15% by weight of 2,3-epoxypropyl(2,3-epithiopropyl)sulfide and/or 2,3-epoxypropyl(2,3-epithiopropyl)disulfide. The thioepoxy optical material is free from color instability, demolding, and polymerization imbalance, which are problems encountered in general thioepoxy optical materials. | 11-13-2014 |
20150018507 | METHOD FOR PRODUCING POLYTHIOL COMPOUND FOR OPTICAL MATERIALS AND COMPOSITION COMPRISING SAME FOR OPTICAL MATERIALS - The present invention relates to a polythiol compound for a high quality optical material that exhibits excellent physical properties in terms of color, a composition for an optical material including the polythiol compound, a method for producing an optical material, and a method for preparing the polythiol compound. The method includes reacting an epichlorohydrin compound containing 0.5% by weight or less of impurities with 2-mercaptoethanol. The polythiol compound is prevented from being colored. The polythiol compound can be used to produce a urethane optical material that is prevented from being colored and has a low yellowness index and a good color. The polythiol compound can be used to produce various optical materials including urethane optical materials. The optical material can be used to manufacture an optical lens having a good color. The optical lens can be used as a spectacle lens, a polarizing lens, a camera lens, or the like. | 01-15-2015 |
20150148512 | NOVEL METHOD FOR PREPARING POLYTHIOL COMPOUND AND POLYMERIC COMPOSITION FOR OPTICAL MATERIAL COMPRISING SAME - The present invention relates to novel methods for preparing a polythiol compound for use in an optical material and polymerizable compositions including a polythiol compound prepared by the methods. According to the methods, a polythiol compound with uniform color, high purity and high quality can be prepared at reduced cost. The polymerizable compositions can be used to manufacture clear, transparent optical lenses with good heat resistance and excellent optical properties. | 05-28-2015 |
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 |