Photographic element in which the antistatic layer is interlinked in the base
AssigneeE. I. Du Pont de Nemours and Company
InventorFrank L. Schadt, III
Life of this patent
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Abstract
An antistatic composition for photographic films which can withstand wet processing is formed by reacting (1) a hydrophobic polymer containing carboxyl groups, (2) a water-soluble copolymer of the sodium salt of styrene sulfonic acid and a carboxyl-containing monomer and (3) carboxylic groups on the film surface to be protected, with (4) a water-soluble polyfunctional aziridine crosslinking agent.
Claims16
A photographic element comprising a polymeric shaped article having available carboxyl groups on the surface thereof and which is coated with a permanent antistatic layer consisting essentially of the reaction product of
- (1) a water-soluble, electrically conductive polymer having functionally attached carboxyl groups integral to the polymer,
- (2) a hydrophobic polymer containing carboxyl groups, and
- (3) a polyfunctional aziridine.
A photographic element comprising a polymeric film support, a photosensitive layer on said support, and a permanent antistatic layer coated on at least one surface of said support, said antistatic layer consisting essentially of the reaction product of (1) a water-soluble, electrically conductive copolymer of a salt of styrene sulfonic acid and a monomer having functionally attached carboxyl groups, in a weight ratio of from 95:5 to 2:3, (2) a hydrophobic polymer containing carboxyl groups, and (3) a polyfunctional aziridine, wherein said aziridine interlinks (1) and (2) to form said antistatic layer;
- and wherein (1) may range from 25 to 85, (2) from 15 to 75, and (3) from 2 to 40, on a weight ratio basis.
A photographic element comprising a polyethylene terephthalate support having coated on one side a photosensitive silver halide or photopolymer layer, and coated on the other side a permanent antistatic layer consisting essentially of the reaction product of (1) a copolymer of the sodium salt of styrene sulfonic acid and the disodium salt of maleic acid in a 3:1 mole ratio, (2) a hydrophobic copolymer of styrene, butyl methacrylate, butyl acrylate, and methacrylic acid, and (3) a polyfunctional aziridine;
- wherein said aziridine interlinks (1) and (2) to form said antistatic layer;
- and wherein (1) may range from 25 to 85, (2) from 15 to 75 and (3) from 2 to 40, on a weight ratio basis.
Dependencies are inferred from the claim text.