Primer coating, polyester film having a primer coating, and a pr

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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Details

528293, 528294, 428480, 428483, C08G 6368, C08G 7500

Patent

active

055457134

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.

REFERENCES:
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Japanese Laid-Open Patent Application (Kokai) No. 3-265843 Nov. 26, 1991 "A Polyester Film for Photosensitive Materials and a Method for Manufacturing Said Film" (copy of original document and copy of complete English translation).

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