Planar polymers of С₆₀ undergo irreversible transformations at high pressure, related with formation of new polymer bonds perpendicular to the two-dimensional polymer planes. It is established that tetragonal (2D-T) polymer transforms into a new three-dimensional polymer phase at pressure ~20 GPa (Fig. 1).The high pressure phase in the 2D-T polymer is characterized by narrow lines in Raman spectrum and high degree of ordering. The new polymer phase of С₆₀ is metastable at normal pressure - upon heating to 580 К it transforms into a mixture of monomer and dimer of С₆₀. It is shown that the rhomboedric polymer (2D-R) transforms into a highly disordered phase at pressure ~14 GPa. The new phase is characterized by chaotic formation of polymer bonds between molecules, belonging to neighboring planar polymer planes. This phase is also metastable at normal pressure and upon heating to 580 К it transforms into a mixture of monomer and dimer of С₆₀.