Abstract: The present invention relates to a method for the rapid production of homogeneous, ultrafine inorganic material via liquid-phase reactions. The method of the present invention employs electrohydrodynamic flows in the vicinity of an electrified injector tube placed inside another tube to induce efficient turbulent mixing of two fluids containing reactive species. The rapid micromixing allows liquid-phase reactions to be conducted uniformly at high rates. This approach allows continuous production of non-agglomerated, monopispersed, submicron-sized, sphere-like powders.

Abstract: Microcapsules are prepared by polycondensation of a melamine/formaldehyde resin mixture in water, in which essentially water-insoluble material forming the capsule core is dispersed, in the presence of an anionic protective colloid, by a process wherein the melamine/formaldehyde resin mixture is composed of: a) an aqueous solution of a condensate of a1) 1 mol of melamine, a2) from 2 to 5 mol of formaldehyde and a3) from 0 to 0.5 mol of a melamine derivative which can undergo an addition or condensation reaction with formaldehyde and a4) from 1 to 5 mol of a C1-C3-alkanol and b) from 0.01 to 1 mol of a water-soluble primary, secondary or tertiary amine or ammonia.

Abstract: Described are compositions comprising core/shell particles and fluoropolymer, wherein the core comprises an ultraviolet absorber, as well as multiphase polymeric compositions comprising a polymeric core phase and a polymeric shell phase, wherein the polymeric core phase comprises an ultraviolet absorber.

Abstract: The fast-curing photosensitive composition capable of being cured by the irradiation with light, comprises a radical-polymerizable unsaturated compound, a photopolymerization initiator, and a thiol-containing compound, whereby the fast-curing photosensitive composition can be adequately cured even with low exposure energy.

Abstract: A heat-expandable microcapsule comprising a polymer shell formed by polymerizing (I) acrylonitrile, a main monomer component, (II) a monomer having carboxyl and (III) a monomer having groups reactive with the carboxyl of the monomer (II) and of a liquid having a boiling point lower than the softening point of the polymer and being encapsulated in the polymer shell. The heat-expandable microcapsules expand within high temperature range, 240° C. or above, and have heat-resistance.

Abstract: The invention is an encapsulated active agent comprising an active agent encapsulated in a crystallizable or thermoplastic polymer wherein the particle size of the encapsulated active agent is 3,000 microns or less wherein the active agent is not significantly extractable from the particles under ambient conditions. In another embodiment the invention is a process for preparing an encapsulated agent which comprises a) contacting an active agent with a crystallizable or thermoplastic polymer wherein the polymer is molten and the active agent in not volatile under the contacting conditions; b) forming particles of about 3000 microns or less; and c) exposing the particles to conditions such that the portion of the particle at and near the surface undergoes rapid solidification. The encapsulated active agents of the invention do not require washing in order for them to be stable in curable compositions. These encapsulated active agents can be designed to release the active agent at a desired temperature.

Abstract: A process for the preparation of microcapsules by the condensation of melamine-formaldehyde resins and/or the methyl ethers thereof in water, in which the substantially water-insoluble material forming the core of the capsule is dispersed, in the presence of an anionic protective colloid at pH's of from 3 to 6.5 by the formation of the microcapsules at temperatures of from 20° to 50° C. followed by curing of the shell of the capsules at from >50° to 100° C., in which, prior to curing, from 10 to 200 wt % of urea, whose amino groups are optionally linked to an ethylene or propylene bridge, based on the melamine-formaldehyde resin are added, the microcapsules produced by this process and also the use thereof in a pressure-sensitive recording system.

Abstract: A process for forming microspheres that includes passing a first composition containing polymer and solvent through an orifice and directly into a second composition containing water and a microsphere-stabilizing agent, under at least one of conditions (a) and (b), wherein (a) the first composition flows through a first conduit along a first path and exits the first conduit at the orifice, the second composition flows through a second conduit along a second path in an upstream to downstream direction, the first conduit is connected to the second conduit and terminates at the orifice, the first and second paths being orientated at an angle &thgr; relative to each other, wherein 0°<&thgr;<180°; (b) the first composition being at a first temperature and including a solvent having a boiling point, the second composition being at a second temperature, the boiling point of the solvent being less than the second temperature; and forming a composition including water and microspheres, the microspheres b

Abstract: This invention relates to suspension polymers having high swellability have low contents of soluble fractions prepared using aliphatic peroxyesters as polymerization initiators.

Abstract: The invention relates to compositions in the form of microcapsules or implants comprising a biodegradable polymeric or copolymeric excipient or a mixture of such excipients with an inherent viscosity of between 0.5 dl/g and 1.6 dl/g in CHCl3, and one active substance or a mixture of active substances, it being possible for said microcapsules or implants to release the active substance or mixture of active substances over a prolonged period of up to three months or more. These compositions may also comprise an active principle having a high specific surface area.

Abstract: Used as latent heat storage media of microcapsules I comprising as core materials one or more lipophilic substances whose solid/liquid phase transition is within the range from −20 to 120° C. and as shell a polymer obtainable by free-radical polymerization of a monomer mixture comprising from 30 to 100% by weight, based on the overall weight of the monomers, of one or more C1-C24-alkyl esters of acrylic and/or methacrylic acid (monomer I), from 0 to 80% by weight, based on the overall weight of the monomers, of a bi- or polyfunctional monomer (monomers II) which is insoluble or of low solubility in water, and from 0 to 40% by weight, based on the overall weight of the monomers, of other monomers (monomers III), and also novel microcapsules Ia, spray-dried microcapsules Ia′, processes for their preparation and shaped articles and coating compositions comprising these microcapsules.

Abstract: Particles comprising (a) a supercooled melt of a poorly water-soluble substance and (b) a stabilizing agent, which have a mean particle size of between 30 and 500 nm, and disperse compositions containing them, as administration forms and delivery systems for drugs, vaccines and other biologically active agents such as herbicides, pesticides, insecticides, fungicides, fertilizers, vitamins, nutrition additives and cosmetics.

Abstract: A composition for delivering a stable, bioactive compound to a subject comprising a first component and a second component, the first component comprises microparticles of sugar glass or a phosphate glass containing the bioactive agent. The sugar glass or phosphate glass optionally includes a glass formation facilitator compound, and the second component comprises at least one biocompatible liquid perfluorocarbon in which the first component is insoluble and dispersed. The liquid perfluorocarbon optionally includes a surfactant.

Abstract: Novel hollow silicone resin particles, having an average particle size of 0.1 to 100 &mgr;m are disclosed. The silicone resin particles comprise a skin formed from thermoplastic silicone resin configured in the shape of a hollow capsule. The hollow thermoplastic silicone resin particles are prepared by spraying a dispersion of water and thermoplastic silicone resin dissolved in solvent into hot gas. The hot gas evaporates the solvent and water and at the same time causes solidification of the thermoplastic silicone resin while it is in the spray state, so as to form a plurality of hollow particles therefrom.

Abstract: Briefly, according to one aspect of the invention, liquid crystal material is microencapsulated by a method utilizing an interfacial polymerization reaction which creates a combination of polyurethane and polyurea polymers which form the capsule walls surrounding the discrete liquid crystal droplets. The formed capsule walls are designed to have an adjustable refractive index so as to allow for the matching of the refractive index to that of the liquid crystal and polymeric binder materials. This allows for the production of a liquid crystal droplet surrounded by polymer film, which is optically clear when the liquid crystal director is aligned with the electric field. The microencapsulated liquid crystal droplets improves the dye stability of a dichroic dye and enhances the contrast of a liquid crystal display.

Abstract: Bichromal balls have two hemispheres, typically one black and one white, each having different electrical properties. Each ball is enclosed within a spherical shell and then a space between the ball and shell is filled with a liquid to form a microsphere so that the ball is free to rotate in response to an electrical field. The microspheres can then be mixed into a substrate which can be formed into sheets or can be applied to any kind of surface. The result is a film which can form an image from an applied electrical field.