Agfa Gevaert Nv

Bernard H Tavernier

Yvan K Gilliams

Noel J De Volder

Walter F De Winter

Robert J Pollet

Frank P Michiels

Francis J Sels

Nikolaas C De Jaeger

In a method for the manufacture of a recording material containing a coated and dried gelatin containing layer on a support, the improvement wherein such layer is coated from an aqueous coating composition containing:

Method for the maufacture of a recording material including gelatin

A liquid toner developer composition suitable for use in developing electrostatic charge patterns, characterized in that the developer contains a metal alkyl sulphonate ionic surfactant in which the metal ion is a bivalent metal ion selected from the group consisting of zinc(II), lead(II), cadmium(II) and copper(II) and the sulphonate group thereof is present directly on an alkyl chain containing at least 6 carbon atoms in a straight chain, which sulphonate has a positive charging effect on the toner, and the sizes of the toner particles and the amount in which said sulphonate is present are selected such that the toner can develop a charge pattern having a charge level corresponding to 50 V for a capacitance of 1.5.times.10.sup.-11 F.cm.sup.-2 up to an optical density of at least 0.8.

Electrophoretic liquid developer containing a metal alkyl sulphonate

A liquid developer composition suitable for use in developing electrostatic charge patterns, which composition contains in an electrically insulating carrier liquid having a volume resistivity of at least 10.sup.9 Ohm.multidot.cm and a dielectric constant below 3, a dispersed particulate coloring substance bearing one or more charge control substances and an organic polymeric material, wherein said polymeric material is a copolymer containing the following recurring units (A) and (B) or (A) and (C): ##STR1## wherein: R represents hydrogen or an alkyl group of 1 to 4 carbon atoms,

Electrophoretic development

Growing community of inventors

Edegem, Belgium

Bernard H Tavernier