Photographic silver halide material with cross-linked particulate acrylic or methacrylic polymer
AssigneeAgfa-Gevaert
InventorsRolf Bruck, Erich Wolff
Life of this patent
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Abstract
Photographic silverhalide containing materials having improved mechanical and electrostatic properties are obtained by adding to at least one of the layers of the material a cross-linked polymer of acrylic acid and/or methacrylic acid which is prepared either (a) by inverse emulsion polymerization of acrylic and/or methacrylic acid monomers in the presence of polyfunctional cross-linking monomers and an emulsifier and breaking of the emulsion and redispersion of the polymer particles in water; or (3) by emulsion polymerization of aliphatic esters of acrylic and/or methacrylic acid in water in the presence of polyfunctional cross-linking monomers and of an emulsifier, followed by saponification of the polymer.
Claims7
A photographic light sensitive material having at least one silver halide emulsion layer, characterized in that at least one of the layers other than a layer containing silver halide, contains an additive insoluble in photographic processing consisting of a cross-linked polymer of acrylic acid or methacrylic acid which has a particle size in the dry state of from 0.01 to 5.mu. and a swelling factor in water limited to from 4 to 40, which polymer was prepared by crosslinking in covalent bonds either:
- (a) by inverse emulsion polymerization (water-in-oil) of 75% to 95% by weight acrylic or methacrylic acid monomers in the presence of water-soluble polyfunctional cross-linking monomers and an emulsifier, breaking down of the emulsion and redispersion of the polymer particles in water;
- or
- (b) by emulsion polymerization of short chained aliphatic esters or acrylic or methacrylic acid in water in the presence of unsaponifiable and substantially water insoluble polyfunctonal cross-linking monomers and an emulsifier, followed by saponification of the polymer, said particles being resistant to diffusion.
Dependencies are inferred from the claim text.