Itatani

Hiroshi Itatani, Ushiku-Shi JP

Patent application number	Description	Published
20100273955	6,6-Polyimide Copolymers and Processes for Preparing Them - The present invention provides a process for preparing a solvent-soluble polyimide copolymer synthesized from a 6,6-imide segment having an imide oligomer with PMDA at both ends produced by adding 4 molar equivalents of pyromellitic dianhydride (PMDA) and 2 molar equivalents of diaminotoluene (DAT) to an imide oligomer produced by heating 1 molar equivalent of biphenyltetracarboxylic dianhydride (BPDA) and 2 molar equivalents of diaminodiphenyl ether (DADE) at 160-200° C. in the presence of a catalyst in an organic polar solvent.	10-28-2010

Patent application number	Description	Published
20110136061	CROSSLINKED POLYIMIDE, COMPOSITION COMPRISING THE SAME AND PROCESS FOR PRODUCING THE SAME - A novel polyimide which retains the characteristics of polyimides, that is, excellent heat resistance, electrical insulation and chemical resistance, of which dielectric constant is lower than those of the known polyimides, as well as a composition containing the same and a process for producing the same, is disclosed. The polyimide of the present invention is a cross-linked polyimide having a dielectric constant of not more than 2.7, which was produced by polycondensing (a) tetramine(s), (a) tetracarboxylic dianhydride(s) and (an) aromatic diamine(s) in the presence of a catalyst.	06-09-2011

Patent application number	Description	Published
20110124915	PROCESS FOR PREPARING FLUOROCARBOXYLIC ACID - A process for preparing a fluorocarboxylic acid, which includes a dehydration step of removing from a mixture containing a fluorocarboxylic acid and water at least a part of the water to obtain a dehydrated fluorocarboxylic acid solution, and a purification step of purifying the dehydrated fluorocarboxylic acid solution.	05-26-2011