摘要:
A method for controlling the encapsulation efficiency and burst release of water soluble molecules from nanoparticle and microparticle formulations produced by the inverted Flash NanoPrecipitation (iFNP) process and subsequent processing steps is presented. The processing steps and materials used can be adjusted to tune the encapsulation efficiency and burst release of the encapsulated water-soluble material. The encapsulation efficiency of the soluble agent in the particles and the burst release of the soluble agent from the particles can be controlled by: (1) the copolymers used in the assembly or coating process, (2) the degree of crosslinking of the nanoparticle core, (3) the incorporation of small molecule or polymeric additives, and/or (4) the processing and release conditions employed.
摘要:
A microcapsule, in particular of spherical shape, having a hollow capsule core encased by a capsule shell, characterized in that the capsule shell is at least partially made of hydrated cementitious material. A method for the production of a microcapsule includes the steps of: a) preparing of a suspension of particulate cementitious material in a solvent b) preparing a dispersion by mixing the suspension of step a) with an immiscible fluid so that (i) the suspension is present as a dispersed phase in the fluid as a dispersion medium or that (ii) the fluid is present as the dispersed phase in the suspension as the dispersion medium, such that the particulate material of the suspension adsorbs at least partially at a phase boundary between the fluid and the suspension, and c) allowing the particulate material adsorbed at the phase boundary to hydrate with the formation of an individual microcapsule.
摘要:
An aqueous microcapsule suspension liquid exhibiting an excellent (long-term) storage stability and allowing easy re-dispersion and dilution with water even after such a storage, is produced by adding a microorganism-fermented polysaccharide of succinoglycan type as a thickening agent into a microcapsule slurry, or by adding such a microorganism-fermented polysaccharide as a thickening agent to a microcapsule slurry after uniform dilution with water.
摘要:
Polymer beads are prepared containing an immobilized extractant for sorbing metal contaminants at concentrations of less than 1 mg/L in dilute aqueous solutions. A preferred polymer is polysulfone and the extractant can be a biomass material or a synthetic chemical compound sorbed into activated carbon. The polymer beads are prepared by dissolving the polymer in an organic solvent to form a solution, adding the extractant to the solution to form a mixture and injecting the mixture through a nozzle into water to form the beads.
摘要:
Articles comprising a thermoplastic substrate bearing rupturable microcapsules in a binder on at least one surface thereof. These articles can be applied by means of heat and pressure to porous objects. The process of applying the articles to porous objects further results in partially embedding the microcapsules in the substrate. Thermoplastic substrates having rupturable microcapsules partially embedded therein, but not having a binder, are another aspect of this invention.
摘要:
A resinous composition for preparing opaque films which consists of a film-forming material in which there is dispersed discrete cellular particles. Each particle is composed of non-opaque, film-forming material, such as acrylic resins, and contains therein one or more cells, having an average diameter of less than 15 microns, which serve to scatter incident light rays. The particulate matter is easily dispersed in the film-forming material by means of conventional mixing procedures.
摘要:
Described are semipermeable microcapsules which comprise an outer semipermeable polymeric skin encapsulating a finely divided heterogeneous catalyst and a ferromagnetic material. The microcapsules are useful as magnetic, heterogeneous catalysts.
摘要:
Opacifying pigment particles consisting essentially of discrete, substantially spherical microcapsules each having a solid, polymeric shell and a solid, polymeric core are provided wherein discrete, inorganic pigment particles are dispersed in the polymeric core of the microcapsules. The inorganic pigment-loaded microcapsules are capable of providing a high degree of opacity and a predetermined degree of glossiness to a given substrate by varying the size of the microcapsules. In addition, the inorganic pigment-loaded microcapsules are retained by fibrous substrates to a much greater extent than are inorganic pigments per se.
摘要:
An encapsulating compound for deep submergence use is a butyl and chlorobutyl copolymer containing reactive chlorine and having added thereto specific fillers, activators, accelerators and curing agents. The resulting compound is useful in encapsulating components exposed to deep sea environments. One such specific compound includes the following constituents: Parts per 100 BY WEIGHT OF AN ELASTOMERIC ISOBUTYLENE-ISOPRENE COPOLYMER CONTAINING REACTIVE CHLORINE 50 FILLER 10 LEAD MONOXIDE 1 FLAKED STEARIC ACID 3 POLYETHELYENE PLASTICIZER 2/1.5 DIPHENYLGUANIDINE AND 2-MERCAPTOIMIDAZOLINE ACCELERATORS 1 MAGNESIUM OXIDE ACTIVATOR AND 5 ZINC OXIDE CURING AGENT.
摘要:
THIS DISCLOSURE IS DIRECTED TO A METHOD FOR FORMING ARTICLES CONTAINING LARGE (500 TO 5000 MICRONS) CAPSULES IN A FLEXIBLE MATRIX BY DEPOSITING LARGE CAPSULES UPON VARIOUS SUPPORT SUBSTRATES WHILE MINIMIZING PREMATURE CAPSULES CELL WALL RUPTURE AT THE TIME OF DEPOSITION AND PRIOR TO USE; ARTICLES OF MANUFACTURE CONTAINING THESE LARGE CAPSULES AND THIXOTROPIC COMPOSITIONS USED TO PREPARE SUCH ARTICLES. THE FORMING PROCESS EMPLOYS A THIXOTROPIC AQUEOUS MATRIX CONTAINING AN ORGANIC POLYMER GEL-FORMING, A FLEXIBLE BINDER (USUALLY A READILY WATER-SOLUBLE OR WATERDISPERSIBLE ELASTOMERIC BINDER) AND VARIOUS OPTIONAL ADJUVANT FILLERS. ACCORDING TO A PREFERRED EMBODIMENT, THE THIXOTROPIC GEL CONTAINING THE LARGE CAPSULES IS EXTRUDED ONTO A FLEXIBLE SUBSTRATE SUPPORT FOLLOWED BY DRYING.