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US 4,287,299 AGranted
Process for the production of matting layers
AssigneeAgfa-Gevaert
InventorsWolfgang Himmelmann, Rolf Bruck, Wolfgang Sauerteig, Peter Kruck, Gunter Kolb, Gunter Sackmann
Life of this patent
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Abstract
For the production of matted outer layers of photographic silver halide recording materials particles of a copolymer of maleic acid anhydride and a C.sub.2 -C.sub.8 monoolefin are dispersed in an aqueous solution of a hydrophilic colloid and the dispersion thus formed is applied to one or both surfaces of the photographic recording material and the layer is dried.
Claims5
In a process for producing photographic material having a supported layer containing particles of a narrow grain size distribution, stable in alkaline solutions to provide a matt surface,
- the steps of providing a dispersion for the layer comprising,
- providing a layer cast as a surface layer of the photographic material, including casting as the surface layer a composition consisting essentially of a hydrophilic colloid and 1-15% by weight of the dispersion polymer particles dispersed in the colloid, said polymer dispersion being obtained by forming a finally divided copolymer suspension of spherical particles of a substantially alternating and equimolecular grouped suspension copolymer of maleic acid anhydride and C.sub.2 -C.sub.8 monoolefin having a particle size from 1 to 10.mu.
- dispersing said particles in a aqueous solution of a hydrophilic colloid in a quantity of from 1 to 15% by weight, based on the weight of the dispersion.
Dependencies are inferred from the claim text.