VERFAHREN ZUR VERHINDERUNG DER BILDUNG VON KONTAKTFLECKEN AUF PHOTOGRAPHISCHEN MATERIALIEN

摘要

In a process for preventing the contact spots formed by contact of the back coating of photographic material with the emulsion side an aqueous polymer dispersion obtained by polymerization of halogen-free compounds and polyvinyl alcohol or partially acetylated polyvinyl alcohol in the presence of an anionic emulsifier are added to the casting composition applied as outermost back coating and/or as uppermost layer.