The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 1996
Filed:
Feb. 28, 1995
James J Krejci, Medina, OH (US);
John M Heberger, Greer, SC (US);
Hoechst Celanese Corporation, Somerville, NJ (US);
Abstract
A polyester film coated with a novel primer coating and overcoated with one or more gelatin-aziridine coatings makes an excellent photographic film. The primer coating has about 85-90% by weight of a water-dispersible copolyester and about 1-15% by weight of an anionic surfactant. The water-dispersible copolyester contains about 80-98 mol % of at least one dicarboxylic acid or its ester equivalent; about 1-20 mol % of a sulfomonomer containing a sulfonate group attached to a dicarboxylic nucleus; and about 100 mol % of at least one glycol having 2-11 carbon atoms. The gelatin-aziridine coating contains about 0.5 to 100% by weight of aziridine, based on the weight of the gelatin. The gelatin-aziridine coating is sufficient to provide adhesion to or serve as a photographic gelatin coating and the aziridine being sufficient to bond the gelatin to the primed film. The gelatin-aziridine coating may constitute a single uniformly blended layer, or separate layers of gelatin and of aziridine with each layer diffused into the other. A process for producing a film useful as a photographic substrate is also disclosed.