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classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C209-84
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C211-51
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H05K1-03
filingDate 2003-02-25-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_13f9c4f93ecd2a22c3b992651fad61d5
publicationDate 2004-09-16-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber JP-2004256418-A
titleOfInvention Paraphenylenediamine, its purification method and its use
abstract The present invention relates to a method for purifying a high-purity paraphenylenediamine having a low metal ion concentration used in a polyimide varnish or a molded product. SOLUTION: In the production of paraphenylenediamine, a method for purifying paraphenylenediamine comprising distilling crude paraphenylenediamine, recrystallizing in a solvent, filtration and drying. Further, the total content of alkali metals is 1 ppm or less. [Selection diagram] None
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