Use of 2-pyrrolidinone derivatives as solvents for photographic addenda in hydrophilic colloid layers

Abstract From the Canadian patent

The disclosure describes a method for the addition of oil-soluble photographic addenda to a hydrophilic colloidal solution for forming a layer of a light-sensitive silver halide photographic material. The method comprises dissolving the addenda with a high-boiling organic solvent and thereafter dispersing, into the hydrophilic colloidal solution the addenda, dissolved in the high-boiling organic solvent. According to the invention the high boiling organic solvent is represented by the following general formula:, wherein R represents an alkyl group or alkenyl having 6 to 22 carbon atoms, R1, R2 and R3 individually represent hydrogen an, alkyl group having 1 to 4 carbon atoms an alkoxy …