METHOD OF PREPARING STIMULUS-RESPONSIVE POLYMERIC PARTICLES

The invention relates to method of making a polymeric compound, comprising discrete particles responsive to an external stimulus, that is resistant to aggregation in high-shear fields, which includes the addition of a polymerization initiator to a reaction mixture comprising a monomer corresponding...

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Bibliographische Detailangaben
Hauptverfasser:	HIGGINS, JOHN, MARTIN, WEAR, TREVOR, JOHN, GIBSON, DANUTA, DESROUSSEAUX, STEPHANIE, VERONIQUE, CLARKE, ANDREW, HOWE, ANDREW, M
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES GENERAL PROCESSES OF COMPOUNDING INKS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING-UP
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Beschreibung
Zusammenfassung:	The invention relates to method of making a polymeric compound, comprising discrete particles responsive to an external stimulus, that is resistant to aggregation in high-shear fields, which includes the addition of a polymerization initiator to a reaction mixture comprising a monomer corresponding to the polymeric compound, wherein the method comprises the portion-wise addition of aliquots of a cross-linking agent to the reaction mixture, wherein an aliquot is added after the polymerization has progressed substantially to completion. The polymer particles are largely immune to the effects of transient shear rates at least as high as 106 s-1, whilst maintaining their thermal responsiveness and being present at moderate concentration. In addition, the structural and chemical modifications brought by the delayed portion-wise addition of the cross-linking agent allow an improvement in stability in a high-shear field, even in the absence of a formulation additive such as a surfactant. La présente invention concerne un procédé de préparation d'un composé polymère qui comprend des particules discrètes sensibles à un stimulus externe et qui résistent à l'agglomération dans des champs de fort cisaillement. Le procédé consiste à ajouter un initiateur de polymérisation à un mélange réactionnel comprenant un monomère correspondant au composé polymère, plus précisément à ajouter en plusieurs fois des aliquotes d'un agent de réticulation, une aliquote étant ajoutée après que la polymérisation a sensiblement progressé. Les particules polymères sont largement insensibles aux effets de vitesses transitoires de cisaillement au moins aussi élevées que 106 s-1, tout en conservant leur sensibilité thermique et en étant présentes à une concentration modérée. En outre, les modifications structurales et chimiques apportées par l'addition différée de l'agent de réticulation permettent d'améliorer la stabilité dans un champ de fort cisaillement, même en l'absence d'un additif tel qu'un tensioactif.