SURFACE MODIFICATION OF PIGMENTS AND COMPOSITIONS COMPRISING THE SAME

• Main Authors: ZHANG, QINGLING, LAROCHELLE, RICHARD, LYNNE K
• Format: Patent
• Language: English; French
• Published: 17.04.2014
• Subjects: ADHESIVES; APPARATUS SPECIALLY ADAPTED THEREFOR; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; CINEMATOGRAPHY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; ELECTROGRAPHY; FILLING PASTES; FREQUENCY-CHANGING; HOLOGRAPHY; INKS; LAKES; MATERIALS THEREFOR; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; ORIGINALS THEREFOR; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICS; POLISHES; PREPARATION OF CARBON BLACK; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; USE OF MATERIALS THEREFOR; WOODSTAINS

Disclosed herein is a method of making a modified pigment, comprising: reacting, under Mitsunobu conditions: (a) a first reactant comprising a protonated nucleophile having a pKa < 15, and (b) a second reactant comprising a hydroxyl-containing organic group, wherein a pigment is attached to either the first or second reactant. The method further comprises forming the modified pigment having attached an organic species comprising the nucleophile bonded to the organic group, with the net elimination of a proton and a hydroxyl. Also disclosed herein are modified pigments, which can have applications in chemical toners, inkjet ink and electrophoretic ink compositions, black matrix materials, color filters, and coatings. L'invention concerne un procédé de fabrication d'un pigment modifié, comprenant : la réaction, dans des conditions de Mitsunobu de : (a) un premier réactif comprenant un nucléophile protoné ayant un pKa < 15, et (b) un second réactif comprenant un groupe organique à teneur en hydroxyle, un pigment étant attaché soit au premier soit au second réactif. Le procédé comprend en outre la formation du pigment modifié auquel est attaché une espèce organique comprenant le nucléophile lié au groupe organique, avec l'élimination nette d'un proton et d'un hydroxyle. L'invention concerne également des pigments modifiés, qui peuvent avoir des applications dans des toners chimiques, une encre pour jet d'encre et des compositions d'encre électrophorétique, des matières de matrice noire, des filtres colorés et des revêtements.