Coating processes – With stretching or tensioning – Running lengths
Patent
1978-08-21
1981-01-13
Brammer, Jack P.
Coating processes
With stretching or tensioning
Running lengths
427171, 430529, 430535, B05D 312, G03C 178
Patent
active
042449880
ABSTRACT:
Film base material is provided which comprises a film of biaxially oriented synthetic linear polyester of highly hydrophobic character having superimposed thereon adherent to said film a subbing layer obtained from an aqueous latex of a copolymer which has been prepared by copolymerizing vinylidene chloride, an alkyl acrylate or methacrylate and optionally a copolymerizable acid and/or at least one allyl, methallyl or vinyl monomer which contains either an active halogen group or an active methylene group in the presence of a mixture of (a) an anionic surfactant which is either an alkyl aryl polyether sulphate, sulphonate or phosphate and (b) a nonionic surfactant which is an alkyl aryl polyalkylene oxide adduct containing at least some units derived from propylene oxide.
The subbing layer improves the adhesion between the film support and the photographic emulsion layers and prevents the separation or frilling of the layers when the final photographic film is processed. Further the surface conductivity of the film base is improved so that there is no need for a separate antistatic layer.
REFERENCES:
patent: 2943937 (1960-07-01), Nadean
patent: 3370951 (1968-02-01), Hasenauer et al.
patent: 3443950 (1969-05-01), Rawlins
patent: 3589905 (1971-06-01), Reedy et al.
patent: 3674531 (1972-07-01), Shephard et al.
patent: 3919156 (1975-11-01), Khanna et al.
Schonfeldt "Surface Active Ethylene Oxide Adducts", 1969, pp. 560-561, Pergamon Press, Ltd., Oxford.
Brammer Jack P.
Ciba-Geigy AG
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