Recent studies have confirmed that model C-60 has stable liquid phase conne
d to rather narrow temperature range; in this letter we determine the phase
diagram of model C-70 and show that also this fullerene possesses liquid p
hase whose existence range is wider than that of C-60. A corresponding stat
e behaviour of C-60 and C-70, emerging from description in terms of reduced
quantities of both the interaction potential and the phase diagrams parame
ters, is then extended to higher-order fullerenes. Critical- and triple-poi
nt densities and temperatures of C-76, C-84 and C-92 are thereby predicted.
The decreasing accuracy of such representation of C-n>70 phase behaviour w
ith increasing n is discussed in relation to the model potential features.