Two fullerene monomers, 61,61'-bis(p-hydroxyphenylmethano)fullerene[60] (I) and 61,61-bis(p-hydroxyphenyl)methano-1,2-fullerene [60] (II) were prepared. Polycondensations between dibromomethane and suitable mixtures of I or II and bisphenol A or 1,20-di(bisphenoxy-A)eicosane (III) in different molar ratios were performed to obtain copolyformals IV-VII that contain up to about 5% (molar) of fullerene units in the main chain. Composition and microstructure of these copolyformals were inferred by UV-visible and matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS) analyses. Copolymers IV-VII are soluble enough materials and exhibit a good thermal stability; besides, the insertion of long linear aliphatic linkages along the main chain of copolyformals VI and VII produces a remarkable lowering in their glass transition temperature at about 15 degrees C.