US 2014/0332729 A1Published application

Process for encapsulating an inorganic pigment by polymerization in an organic medium

AssigneesArkema France, Institut Polytechnique De Bordeaux, Universite De Bordeaux 1, Centre National De La Recherche Scientifique

InventorsCyril Brochon, Georges Hadziioannou, Antoine Charbonnier

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Abstract

The present invention relates to the field of inks for electrophoretic display devices, and more particularly to a process for encapsulating at least one inorganic pigment by dispersion polymerization in an organic medium. The process consists in dispersing the inorganic pigment in the organic medium, then in synthesizing at least one stable polymer latex in said organic medium, said latex precipitating around said inorganic pigment in order to form a protective shell and to thus obtain a particle, said synthesis of the latex being carried out by polymerization, in said organic medium, of an electrostatically chargeable functional monomer, based on use of a macroinitiator capable of stabilizing said particle obtained.

Claims11

Dependent claims

A process for encapsulating at least one inorganic pigment by dispersion polymerization in an organic medium, wherein the process consists of:

dispersing said inorganic pigment in said organic medium,
synthesizing at least one stable polymer latex in said organic medium, said latex precipitating around said inorganic pigment in order to form a protective shell and to thus obtain a particle, said synthesis of the latex being carried out by polymerization, in said organic medium, of an electrostatically chargeable functional monomer, based on the use of a macroinitiator capable of stabilizing said particle obtained,
and wherein the synthesis of the latex is carried out by polymerization, in said organic medium, of an electrostatically chargeable functional monomer, based on the combined use of a macroinitiator capable of stabilizing said particle obtained, and of a co-initiator.

Dependencies are inferred from the claim text.