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US 4,304,851 AGranted
Polyester sublime layers for photographic layers with polyester bases
AssigneeBexford Limited
InventorsPatrick T. McGrail, David R. Mann
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Abstract
Light-sensitive photographic films are produced by coating polyester films with aqueous dispersions of polyesters or copolyesters containing free-functional acid groups. Corona discharge treatment of the polyester or copolyester layers is disclosed for direct adhesion to photographic emulsions or indirect adhesion via a polymeric sub and/or gelatin sub.
Claims9
A light-sensitive photographic film, which comprises:
- (a) a film of a synthetic linear polyester;
- (b) a layer of a synthetic polyester or copolyester having a dry coat weight in the range 0.1 to 10.0 mg/dm.sup.2 applied to one or both surfaces of the polyester film, the coating polyester or copolyester having an acid number in he range 1 to 120 and containing free-functional acid groups derived from the condensation with one or more glycols of one or more organic acids selected from the group consisting of trimellitic acid, pyromellitic acid, trimesic acid, sulphoterephthalic acid, sulphoisophthalic acid, sulphophthalic acid and benzophenone tetracarboxylic acid or an anhydride or lower alkyl ester of such an acid;
- (c) a light-sensitive photographic layer applied over one or both of the layers of coating polyester or copolyester.
A light-sensitive film according to claim 7, in which the coating polyester or copolyester is prepared by the reaction of:
- trimellitic anhydride with ethylene glycol and benzyl alcohol;
- trimellitic anhydride with ethylene glycol, isophthalic acid and benzyl alcohol;
- trimellitic anhydride with ethylene glycol, chlorendic anhydride, and benzyl alcohol;
- trimellitic anhydride with 1,2-propanediol and cyclohexanol;
- or
- sulphoterephthalic acid with ethylene glycol, isophthalic acid, terephthalic acid and neopentyl glycol.
3 more elements
Dependencies are inferred from the claim text.