| abstract |
And the general formula Rf (A-OH) k (wherein k is 1 or 2, when k is 1, Rf is a C 6 perfluoroalkyl group described below, some of the hydrogen atoms of the fluorine atoms of the alkyl group in the perfluoroalkyl-substituted poly A perfluoroalkyl group having 6 or less carbon atoms, a perfluoroalkyl group having 6 or less carbon atoms, a perfluoroalkyl group having 6 or less carbon atoms, a perfluoroalkyl group having 6 or less carbon atoms, a perfluoroalkyl group having 6 or less carbon atoms, Rf is a linear or branched perfluoroalkyl group having 6 or less carbon atoms and a perfluoroalkylene group having an ether bond or a linear or branched perfluoroalkyl group having 6 or less carbon atoms, A polyfluoroalkylene group, and A is an alkylene group having 1 to 6 carbon atoms), a condensate of boric acid and polyvinyl butyral, and a fluoroboric acid PVB composition. |