| abstract |
Abstract of the Disclosure This invention relates to new compounds of the formula wherein m is 1 or 2, r is 1 or 2, A1, A2 and A3 denote alkylene radicals with at most 4 carbon atoms, A' and A" denote alkyl radicals with 1 to 2 carbon atoms and R' and R" denote hydrogen atoms or alkyl radicals, and the corresponding compounds in which at least one of the nitro-gen atoms bonded to A' and A" is quaternary. The new compounds are useful as crosslinking agents. They an particularly useful for crosslinking gelain, preferably gelatin present in layers of photographic material. |