| abstract |
NEW MATERIAL:A fluorine-containing aromatic diamine shown by formula I (R l and R 2 are 1-10C perfluoroalkyl or H and a case wherein R 1 =R 2 =H is omitted). n EXAMPLE: 2,2-Bis[(4-amino-2 trifluoromethylphenoxy)phenyl]hexafluoropropane. n USE: Useful as a basic component of polyimide, polyamide, etc. A polymer obtained from the diamine has excellent heat resistance, can improve water vapor resistance and reduce permittivity and is extremely useful. n PREPARATION: 2,2-Bis(4-hydroxyphenyl)hexafluoropropane is condensed with a nitrobenzene shown by formula II (X is halogen) in an aprotic solvent in the presence of a base to give a dinitro compound shown by formula III. Then the compound shown by formula III is reduced to give a compound shown by formula I. n COPYRIGHT: (C)1989,JPO&Japio |