. . "The alkyl groups in the fluoroalkyl groups represented by R29 may be straight or branched and preferably have 1 to 8 carbon atoms, examples thereof including methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, n-pentyl, isopentyl, n-hexyl, heptyl and octyl, in which the total number of the substituted fluorine atoms is preferably 1 to 17." . . .