Tetrapolymer subbed photographic film
AssigneeCiba-Geigy Corporation
InventorsRobert Stanley Cook, Peter John Wright
Life of this patent
Estimating the term…
Abstract
The present invention relates to polyester film material. Adherent to the polyester base the film material comprises a copolymer of A. vinylidene chloride, B. alkyl acrylate, alkyl methacrylate, vinyl acetate and/or acrylonitrile C. a copolymerizable acid and D. a halogenoacetic acid allyl- or vinyl ester or a halogenomethyl vinyl ketone. The copolymer forms a subbing layer suitable for anchoring silver halide emulsion layers on the poly-ester film base.
Claims4
Film material comprising a film of biaxially oriented synthetic linear polyester of highly hydrophobic character having superimposed thereon adherent to said film a layer which comprises a copolymer consisting of (a) 20 to 90 mole % of vinylidene chloride, (b) 5 to 50 mole % of a copolymerisable ethylenically unsaturated monomer selected from the group consisting of alkyl acrylate, alkyl methacrylate, vinyl acetate and acrylonitrile, (c) 1 to 20 mole % of at least one copolymerisable acid selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, mesaconic acid and citraconic acid and (d) 1 to 30 mole % of (d.sub.1) an allyl component of the formula ##STR7## R.sub.1 is hydrogen or methyl X.sub.1 is a bromine or chlorine atom and R.sub.2 and R.sub.3 are each hydrogen or methyl or are the same halogen atom as X.sub.1, or (d.sub.2) a vinyl component of the formula ##STR8## wherein X.sub.2 is a chlorine or bromine atom.
Dependencies are inferred from the claim text.