abstract |
The invention relates to an addition compound which is obtainable by reaction of a diamine of the formula I, I where R1 is (C2-C4)-alkylene or 1,2- or 1,3-cyclo-(C3-C7)-alkylene and R2 and R3, which are identical or different, are (C1-C3)-alkyl or hydrogen or R2 and R3 together are (C2-C4)-alkylene, with fullerenes C60 and/or C70. |