An encapsulation process employs an aqueous dispersion of silica having a particle size not substantially greater than 100 nm. An emulsion is formed by high shear mixing of the silica dispersion with the material to be encapsulated and the emulsion is gelled. The process allows hydrophobic materials to be encapsulated in structures which have a high loading of the material and a good degree of imperviousness in the presence of other materials such as surfactants and mineral oils. Using the process, hydrophobic materials such as flavors, fragrances and cosmetic ingredients can be encapsulated for delayed release in a wide variety of products.
A method of crystallizing (1R,5S,6S)-2-[(6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazolium-6-yl)]thio- 6-[(R)-1-hydroxyethyl]-1-methyl-carbapenem-3-carboxylate (hereinafter simply referred to as L-627), which is characterized by maintaining an aqueous solution of L-627 at temperatures ranging from the eutectic temperature of the solution to temperatures lower than 0.degree. C. The method provides some advantages that loss of L-627 accompanied by crystallization is less, number of steps in the preparation of vial formulations is less and maintenance of these steps under sterile and dust-free conditions can be performed easily, dispensation of the drug can be conducted with quantitative accuracy, and the crystals dissolve in a solvent promptly at the time of use.
Objects of the present invention are to provide a microcapsule which can effectively and easily achieve: the prevention and adjustment of the bleeding-out of the encapsulated liquid substance from the capsule shell; and the enhancement and adjustment of the physical strength of the microcapsule; and to further provide a sheet and an electrophoretic display, both of which involve using the above microcapsules. As means of achieving these objects, the microcapsule according to the present invention is a microcapsule comprising a shell and a liquid substance that is encapsulated in the shell, with the microcapsule being characterized in that the shell contains fine particles having particle diameters of not larger than 1 .mu.m. And the sheet according to the present invention comprises the microcapsules according to the present invention and a binder resin or comprises the microcapsules according to the present invention and a base material. And the electrophoretic display according to the present invention has as a constitutional portion a portion which includes opposite electrode films and the microcapsules according to the present invention, wherein at least either one of the opposite electrode films is transparent, and wherein the microcapsules are disposed between the opposite electrode films.
An emulsion comprising: water; hydrophilic particles; and hydrophobic particles; wherein the hydrophilic and hydrophobic particles form shells encapsulating a gas that are suspended in the water, said shells comprising an external layer of hydrophilic particles and an internal layer of hydrophobic particles adjacent to the layer of hydrophilic particles.
The invention deals with forming stable dispersions or emulsions of hydrated silica which in turn are useful in forming cosmetic compositions such as blends, powders, or sticks useful in treating the hair, skin, or nails.
An emulsion comprising: water; hydrophilic particles; and hydrophobic particles; wherein the hydrophilic and hydrophobic particles form shells encapsulating a gas that are suspended in the water, said shells comprising an external layer of hydrophilic particles and an internal layer of hydrophobic particles adjacent to the layer of hydrophilic particles.
