Process for forming a subbing layer on a plastic support

Claim 1

In a process for forming a subbing layer by applying an aqueous dispersion of a copolymer consisting of at least one diolefin monomer and one or more vinyl monomers to a plastic film base for photographic sensitive materials, the improvement which comprises the gel fraction of the copolymer in said aqueous dispersion is about 80% by weight or less and wherein said diolefin is selected from the group consisting of butadiene, isoprene, chloroprene, 1,4-pentadiene, 1,4-hexadiene, 3-vinyl-1,5-hexadiene, 1,5-hexadiene, 3-methyl-1,5-hexadiene, 3,4-dimethyl-1,5-hexadiene, 1,2-divinylcyclobutane, 1,6-heptadiene, 3,5-diethyl-1,5-heptadiene, 4-cyclohexyl-1,6-heptadiene, 3-(4-pentenyl)-1-cyclopentene, 1,7-octadiene, 1,8-nonadiene, 1,9-decadiene, 1,9-octadecadiene, 1-cis-9-cis 12-octadecatriene, 1,10-undecadiene, 1,11-dodecadiene, 1,12-tridecadiene, 1,13-tetradecadiene, 1,14-pentadecadiene, 1,15-hexadecadiene, 1,17-octadecadiene and 1,21-docosadiene and wherein said vinyl monomer is selected from the group consisting of styrene and derivatives thereof, acrylonitrile, methyl methacrylate, vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, itaconic acid, alkyl acrylates, acrylamide, methacrylamide, acrolein, methacrolein, glycidyl acrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, 3-hydroxyethyl methacrylate, allyl acrylate, allyl methacrylate, N-methylolated acrylamide, N-methylolated methacrylamide, divinylbenzene, vinyl isocyanate and allyl isocyanate.