STUDIES ON GELATIN CROSS-LINKED WITH SUBSTITUTED TRIAZINE

The swelling of differently crosslinked gelatin layers, which were hardened with substituted triazines has been studied. Thereby a direct influence of the molecular mass distribution of gelatin could not be found, but an effect of the different numbers of N-terminal groups could be detected, using a low-molecular mass and a high-molecular mass fraction of the same gelatin. If the number of N-terminal groups was diminished by about 25%, by alkylation with a sulphobetaine, the differences in swelling disappeared. Furthermore, the alkylation reduces the brittleness of the gelatin layer and the interaction of the gelatin with hydrophilic colour couplers (so-called coupler viscosity).