TAOKA CHEMICAL CO., LTD.
|TAOKA CHEMICAL CO., LTD. Patent applications|
|Patent application number||Title||Published|
|20130331598||2-CYANOACRYLATE-PURIFYING METHOD - Provided is a 2-cyanoacrylate-purifying method for decoloring a 2-cyanoacrylate which has been colored, and preventing further coloring of the 2-cyanoacrylate thus decolored. The 2-cyanoacrylate-purifying method includes the steps of: (a) adding a specific polyhydric aromatic compound to the 2-cyanoacrylate which has been colored; and (b) storing, at a temperature in a range of 0° C. to 40° C. for 0.5 day or more, the resulting mixture obtained in the step (a), and then subjecting the mixture to reduced pressure distillation.||12-12-2013|
|20120255461||METHOD FOR PURIFYING ETHYL-2-CYANOACRYLATE ADHESIVE COMPOSITION AND ETHYL-2-CYANOACRYLOATE ADHESIVE COMPOSITION - The present invention provides an ethyl-2-cyanoacrylate adhesive composition obtained as a result of significant improvement on conventional problems, that is, irritating odor and whitening of conventional ethyl-2-cyanoacrylate adhesive compositions. According to a method of the present invention for purifying an ethyl-2-cyanoacrylate adhesive composition, a sum total of an acrylonitrile content and an ethanol content is arranged to be in a range of 1 ppm to 150 ppm, by carrying out deaeration at the same time as injection of an inactive gas at a reduced pressure in a range of 100 Pa to 10000 Pa at a temperature in a range of 5° C. to 50° C. Thereby, the method of the present invention allows improving irritating odor and whitening.||10-11-2012|
|20120095270||NONCRYSTALLINE FORM OF FLUORENE DERIVATIVE AND PROCESS FOR PREPARATION THEREOF - An object of the present invention is to provide (i) a novel non-crystalline form of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene, which non-crystalline form maintains quality at a certain level, and is excellent as a polymer material, and (ii) a method of preparing the non-crystalline form. According to the present invention, molten 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene in a liquid form is cooled and therefore is solidified. With the method, it is possible to provide a novel non-crystalline form of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene which has a small risk that powder dust of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene might cause explosion or a health problem. Further, the non-crystalline form of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene can be adjusted arbitrarily in particle diameter by, for example, pulverizing the non-crystalline form in accordance with equipment or usage. In other words, the non-crystalline form of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene is advantageous in handleability industrially.||04-19-2012|
|20120029244||METHOD FOR PRODUCING FLUORENE DERIVATIVE - A method for producing a fluorene derivative by reacting fluorenone with a phenol or a phenoxyalcohol in the presence of an acid catalyst includes: adding an alkali to an obtained reaction liquid containing a fluorene derivative; and concentrating a resultant mixture liquid without removing the alkali thus added and a reaction product of the alkali, thereby separating an unreacted phenol or unreacted phenoxyalcohol.||02-02-2012|
Patent applications by TAOKA CHEMICAL CO., LTD.