The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 1985
Filed:
Mar. 02, 1983
Samuel B Kingston, Doddinghurst, GB;
Graham Evans, Galleywood, GB;
Ciba Geigy AG, Basel, CH;
Ciba Geigy AG, Basle, CH;
Abstract
Photographic material containing on a support at least one silver halide emulsion layer which contains as binders both gelatin and a polymer latex, wherein the particle size is less than 0.05 .mu.m, and which is obtained by emulsion polymerizing a monomer or monomer mixture which consists of an alkyl acrylate or an alkyl methacrylate or a monomer mixture comprising both an alkyl acrylate and an alkyl methacrylate or a mixture comprising an alkyl acrylate and/or an alkyl methacrylate together with up to 5% by weight of an ethylenically unsaturated copolymerizable acid and/or up to 30% by weight of other ethylenically unsaturated comonomers in the presence of at least 12% by weight of the monomers present of an anionic surfactant at a temperature of from 15.degree. C. to 90.degree. C. by use of a redox initiator system which is present to the extent of from 0.1% to 3% by weight of the monomers present. The latexes are of use to partially replace gelatin in photographic materials. These latex/gelatin binders are suitable for highspeed coating and drying processes and confer to the photographic materials an increased dimensional stability.