Abstract: A waterproof, polyolefin coated paper support for photographic coatings is disclosed, wherein the paper base contains an alkylketene dimer as a hydrophobizing sizing agent. The alkylketene dimer consists to the greater part of behenyl ketene and contains no more than 40% residues originating from alkylketenes having chains shorter than C.sub.20 -alkyl.

Abstract: A waterproof photographic paper support, which is coated with a polyolefin resin, is provided. The paper itself is formed from a particular paper pulp composition which contains fatty acids and/or fatty acid salts and an aluminum salt, as well as, if necessary, alkylketenedimer. Such paper pulp concentration contains, furthermore, anionic and cationic polyacrylamides in the ratio of 40:60 to 60:40, as well as an epoxidized fatty acid amide. The acrylic acid content of the anionic polyacrylamide amounts to between about 5% and 20%.

Abstract: A photographic paper support material for photographic purposes is disclosed with a polyolefin coating on both sides, wherein the base paper is internally sized by using a hydrophobizing sizing agent, and is surface sized with an aqueous coating mixture. The aqueous coating mixture contains a carboxyl-modified polyvinyl alcohol and optionally includes compounds with polyvalent cations. The paper support material is preferably used with such photographic layers as require wet development and wet fixing of the photographic image with photographic processing solutions.