Nonionic surface active oligomers as coating aids for the manufacture of photographic products

摘要

A hydrophobically capped oligomeric acrylamide or pyrrolidone is employed as a coating aid in coating compositions, especially such compositions useful in the manufacture of photographic products. Preferred coating aids are surfactants having the general formulaR-L-T or    in whichR, R1 and R2 are each independently selected from aliphatic hydrocarbyl, aryl(aliphatic hydrocarbyl) and (aliphatic hydrocarbyl)-aryl groups, which groups may be unsubstituted, partially fluorinated or fully fluorinated,L is a sulphur atom or a linking group that contains a sulphur atom attached to the T group andT is a hydrophilic oligomeric group obtainable by the oligomerisation of one or more vinyl monomers having an amido function.