Abstract:
Methods of producing polyphosphazene microspheres comprising admixing aqueous solutions of a water-soluble polyphosphazene and an organic amine, or salt thereof, are disclosed.
Abstract:
Catanionic vesicles, the walls of which are constituted of a mixture of surfactants of opposite charges. Process for preparing same and uses thereof, especially in the field of pharmacy or cosmetics, in the sector for the pollution control of aqueous media or in the field of the synthesis of nanoparticles.
Abstract:
Disclosed are encapsulating methods and encapsulated products. A payload material may be encapsulated within a wall material. The carrier material and payload material form a combination that is at least substantially solid at room temperature but that is sufficiently fluid at milling temperature to permit milling and subsequent encapsulation. The payload material may be, for instance, a bitter tasting material. In some embodiments, the microcapsules will serve a taste masking function. In other embodiments, the microcapsules may be used where a slow release of the payload material is desired.
Abstract:
An apparatus for encapsulating cells is disclosed. According to one embodiment, the apparatus includes an indirect-pumping dispenser for dispensing a cell suspension into an encapsulation solution through an outlet of the dispenser. The apparatus also includes a dipping mechanism that is attachable to the outlet of the dispenser. The dipping mechanism is adapted to dip the dispenser outlet in the encapsulation solution to allow the cell suspension dispensed thereat to come into contact with the encapsulation solution.
Abstract:
Disclosed are emulsions and microcapsules that comprise one or more substances with a low interfacial tension. Methods of making the emulsions and microcapsules as well as methods of using them are also disclosed.
Abstract:
The present invention relates to a method for preparing microcapsules by coacervation, and to the use of transglutaminase for cross-linking in complex coacervation. The present invention relates further to coacervation processes in general in which a material to be encapsulated is added to a solution comprising at least one colloid below the gelling temperature of the colloid. According to a method of the present invention, an emulsion or suspension of hydrophobic material is prepared after cooling a solution that includes hydrocolloids below the critical gelling temperature of a coacervate phase.
Abstract:
The present invention relates to a microcapsule that can be used to form a rewritable medium for visual displays that are stable in the presence of electric fields having a strength that is typical in the work environment. The microcapsule of the invention comprises charged particles of one or more colors that are suspended in a phase change material that has a melting temperature in the range of between about 30° C. and about 200° C. The microcapsules can be used to form an electrophoretic coating that includes microcapsules of the invention distributed throughout a polymer matrix. The electrophoretic coating can be used to coat a substrate to form a rewritable medium.
Abstract:
The invention provides microcapsules having an average diameter of 0.1 to 25 μm, obtained by a process (a) or (b), wherein, (a1) preparing an aqueous emulsion comprising actives and optionally oil components and/or emulsifiers; (a2) treating the emulsifier with an aqueous solution of anionic polymers to form a matrix; (a3) contacting the matrix with an aqueous solution of cationic polymers to form a capsule and optionally (a4) separating the aqueous phase from the capsules, or (b1) preparing an aqueous emulsion containing actives and optionally oil components and/or emulsifiers; (b2) treating the aqueous emulsion with an aqueous solution of cationic polymers to form a matrix; (b3) contacting the matrix with an aqueous solution of an anionic polymer to form a capsule and optionally (b4) separating the aqueous phase from the capsule. The microcapsules are useful in paint and lacquer formulations.
Abstract:
The present invention relates to a microcapsule that can be used to form a rewritable medium for visual displays that are stable in the presence of electric fields having a strength that is typical in the work environment. The microcapsule of the invention comprises charged particles of one or more colors that are suspended in a phase change material that has a melting temperature in the range of between about 30° C. and about 200° C. The microcapsules can be used to form an electrophoretic coating that includes microcapsules of the invention distributed throughout a polymer matrix. The electrophoretic coating can be used to coat a substrate to form a rewritable medium.
Abstract:
A phoretic display device comprising a plurality of electrophoretic or magnetophoretic cells, each having a phoretic particle dispersed within a suspension medium comprising a liquid crystal material. The phoretic cell is adapted to induce defects, sometimes known as disclinations, in the alignment of the liquid crystal material within the cell which act to exert a retentive force on the phoretic particle when within the region of influence of the defects. The configuration of the display introduces a threshold level in the electric or magnetic field required to move the phoretic particle between defects within the cell. Accordingly, the non-linear electro-optic or magneto-optic behaviour of the display facilitates matrix addressing of the cells therein. The display may comprise a plurality of prolate spheroid phoretic cells arranged in an encapsulant, the major (long) axis of each cell arranged substantially perpendicular to the plane of the display.