Chemically enhanced negative resist without cross-linking

In some applications, the substrate on which the negative resist is to be applied cannot be heated. This may be the case for sensitive glass and especially for very big substrates. For instance, the negative resist is used for the structuring of a 4 meter copper cylinder for carpet printing. The patterns are etched into the copper with a trivalent iron chloride solution. A tempering of the cylinder up to 95 °C is not possible though. AR-N 4400-10, however, still crosslinks sufficiently after exposure at room temperature over night. The developer should merely be diluted to some extent. At higher temperatures, e.g. a water bath of 40 °C, the crosslinking temperature can be reduced to a few hours only.