270 results about "Polymeric Microsphere" patented technology

Water-based adhesive compositions are improved by the incorporation of hollow polymeric microspheres having outer surfaces coated with one or more barrier materials such as calcium carbonate particles. The adhesive compositions exhibit enhanced rheology, sprayability, drying time, tack and storage stability as compared to analogous adhesives that are not modified with coated hollow polymeric microspheres. Such compositions are useful as both contact adhesives as well as wet bonding one-way adhesives.

The invention relates to a harsh oil deposit reversed-phase microemulsion profile-control flooding system and a preparation method thereof. The problems in the prior art that the initial particle size of the product is improper and polymeric microspheres are poor in expansibility under high-temperature high-salt conditions are mainly solved. The harsh oil deposit reversed-phase microemulsion profile-control flooding system disclosed by the invention comprises the following components in parts by weight of microemulsion: 20-70 parts of an oil-soluble solvent, 5-20 parts of an emulsifier and a co-emulsifier, 20-70 parts of a polymer aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers. According to the technical scheme, a semi-continuous reaction method is adopted, the aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers is added into an oil phase containing the emulsifiers in batches, and a hydrophobic monomer is added, so that the problems are solved, the prepared polyacrylamide reversed-phase microemulsion is directly compounded or is compounded with other oil field chemicals to be applied to such field applications for improving oil recovery as depth profile control, water plugging and displacement in tertiary oil recovery of a harsh oil deposit.

The present invention relates to a method for preparing microsphere and microspheres produced thereby. The method comprises: mixing a water-insoluble organic solvent with a dispersion solvent; mixing a polymer compound, a drug and a water-insoluble organic solvent to prepare a dispersed phase; mixing the dispersed phase with the dispersion solvent mixed with the water-insoluble organic solvent to prepare an emulsion; and adding a base or an acid to the prepared emulsion. With the method, it is possible to prepare a drug-containing polymeric microsphere cost-effectively and conveniently.

PCT No. PCT/KR97/00055 Sec. 371 Date Aug. 2, 1999 Sec. 102(e) Date Aug. 2, 1999 PCT Filed Apr. 1, 1997 PCT Pub. No. WO97/36949 PCT Pub. Date Oct. 9, 1997A preparation method for biodegradable polymeric microspheres using a solvent extraction method for biodegradable polymeric microspheres for treating a local inflammation disease using the same which are capable of effectively curing ozena such as sinusitis and a middle ear infection. Since a non-solvent of polymer is added into an outer aqueous phase in advance, the solidification of the polymer is implemented in a short time which, in turn, improves encapsulation of the therapeutic agent used.

The present invention relates to a method for preparing microspheres and microspheres prepared thereby, more particularly to a method for preparing a polymeric microsphere, including preparing an emulsion including a polymer compound, a drug, a water-insoluble organic solvent and a dispersion solvent and adding to the prepared emulsion a base or an acid to remove the water-insoluble organic solvent from the emulsion, a polymeric microsphere prepared thereby, and a composition for drug delivery including the microsphere. According to the present invention, a drug-containing polymer microsphere may be prepared quickly and simply without the solvent evaporation or solvent extraction process, thereby reducing water consumption and minimizing wastewater generation.

A secondary backing for surface coverings is disclosed which comprises at least one thermoplastic material optionally having polymeric microspheres dispersed therein. A textile substrate comprising a primary backing with textile fibers extending upwardly from the backing and forming a surface and the above-described secondary backing attached thereto is also described. Methods of making the textile substrate and the secondary backing which can be foam or hardback are also described. Also described is a resilient surface covering, such as vinyl flooring, using the secondary backing of the present invention in one or more layers.

The present invention relates to topical compositions containing solid particles that are stabilized via entrapment by microspheres and methods for making the same. Each of the microspheres contains a collapsed polymeric shell that has entrapped therein one or more solid particles. The solid particles are preferably formed of zinc oxide or titanium dioxide or both, which can readily be used either alone or in combination with other sunscreen agents to form sunscreen compositions of broader UV protection spectrum and enhanced photostability.

The invention provides a cross-linked polymer microsphere-polymer composite deep water control agent and a using method thereof. The control and drive agent includes water-soluble cross-linked polymer microspheres, water-soluble polymers and water; in the composite deep-seated control and drive agent, the mass percentage of the water-soluble cross-linked polymer microspheres is 0.01% to 0.3%, The mass percent content of the water-soluble polymer is 0.05%-0.5%, and the balance is water. The cross-linked polymer microsphere-polymer composite deep control and flooding agent provided by the present invention has a higher liquid flow redirection ability than conventional polymer flooding, can delay the one-way breakthrough of the polymer solution in the application process, and improve the efficiency of polymer flooding. The sweep coefficient has a higher ability to improve the oil-water phase mobility ratio than the conventional cross-linked polymer solution, and improves the displacement ability of the cross-linked polymer solution, which is more suitable for water injection development reservoirs with heterogeneous porous media.

The present invention relates to a process for producing a dispersion of polymeric microspheres in a polyol comprising expanding 1 to 70% by weight of polymeric beads in a polyol with a twin screw extruder to simultaneously mix and expand the beads to create a uniform dispersion of the microspheres in the polyol such that the wetting of the microspheres by the polyol is maximized.

The invention relates to a graphite silicon-based composite anode material for a lithium ion battery and a preparation method thereof. The graphite silicon-based composite anode material comprises a nano-silicon cracked carbon composite material, graphite and a carbon material coating layer. The preparation method comprises the following steps: firstly, nano-silicon is obtained by a high-energy wet mechanical milling method; secondly, nano-silicon and a polymer with high carbon residue are compounded by dispersion polymerization so as to form a polymer/nano-silicon composite microsphere emulsion with nano-silicon inlaid in polymeric microspheres; thirdly, the microsphere emulsion and graphite are compounded; and finally, solid-phase coating is carried out by the use of an organic carbon source, and heat treatment is conducted to obtain the graphite silicon-based composite anode material for a lithium ion battery. By the above method, the problem that nano-silicon is liable to agglomeration, especially agglomeration of nano-silicon from a liquid disperse state to a dry state, due to low granularity and high specific surface energy is solved. The anode material has characteristics of high specific capacity (greater than 550mAh/g), high initial charge discharge efficiency (greater than 80%) and high conductivity.

A method of delivering an admixture providing freeze-thaw resistance to a cementitious composition is provided which includes the addition of a viscosity modifying admixture containing at least one of polymeric microspheres, at least partially degradable polymeric particles, or gas generating additives to cementitious compositions. The polymeric microspheres, at least partially degradable polymeric particles, and gas generating additives provide void spaces in the material matrix, and such void spaces act to increase freeze-thaw durability of the material.

The invention relates to a simple preparing method of molecularly imprinted polymeric microspheres applicable to an aqueous solution system. Crosslinking degree of the molecularly imprinted polymeric microspheres is larger than 50%, grain size of each molecularly imprinted polymeric microsphere ranges from 0.2-5 micrometers, and hydrophilic macromolecule brushes are grated on the surfaces of the molecularly imprinted polymeric microspheres. The molecularly imprinted polymeric microspheres are synthesized in one step via a reversible addition-fragmentation chain transfer (RAFT) precipitation polymerization technology induced by hydrophilic macromolecular chain transfer agent. The preparing method is simple in synthesis, wide in application range, pure in product and the like. The molecularly imprinted polymeric microspheres prepared by the method have wide application prospect in multiple fields including chromatographic support, biological sample analysis, medical clinical immunoassay, food and environmental monitoring, mimic enzyme catalysis, biomimetic sensor and the like.

The invention is directed to a polymeric microparticle containing silicone release composition having improved slip/shear, anti-block, transfer, and lower release properties. The silicone release composition may be formed of thermal or radiation cured solventless silicone release compositions. The silicone release composition may also be formed of a UV-cationic silicone release composition. The polymeric microparticles are preferably polymeric microspheres. The invention is further directed to the use of such microparticle containing silicone release compositions to coat a substrate, and release coated substrates formed thereof.

The invention relates to the field of anisotropy conductive adhesives, in particular to a method for coating a polymeric microsphere with a carbon nano tube. The method comprises the steps that the outer surface of the polymeric microsphere is coated with the carbon nano tube through carbon nano tube dispersion liquid, and the method is applicable to preparation of conductive particles in anisotropy conductive adhesives. The method mainly comprises the steps that the carbon nano tube dispersion liquid is prepared through a surface active agent; 2, the polymeric microsphere is placed into the obtained carbon nano tube dispersion liquid to be mixed to form a mixed solution; 3, centrifugal separation is carried out to remove redundant carbon nano tube dispersion liquid; 4, a water washing or solvent cleaning method is utilized for removing residual surface active agent; 5, drying is performed to obtain a polymeric microsphere powder sample evenly coated with the carbon nano tube is obtained. The technology is simple, rapid and efficient, and the problems of resource shortage, the high cost, complex equipment and the like existing in the existing method of preparing a conductive microsphere from metallic nickel (Ni), gold (Au), nickel coated with gold and other materials are solved.

A method of plugging a fracture in a subterranean formation which includes placing into the fracture a composition comprising microspheres or microbeads, wherein the microspheres are created by surface crosslinking of droplets in a water-in-water emulsion. Such microspheres may form a filter cake in the formation. The microspheres may include a chemical agent to be released when the microspheres dissolve.

The invention discloses a preparation method of molecularly imprinted polymeric microspheres for 2,4,6-trinitrophenol detection. The preparation method is characterized in that polynitrophenol derivatives-imprinted molecules generated through reaction between 2,4,6-trinitrophenol and N,N'-diisopropyl carbodiimide have luminous yellow fluorescent light, the fluorescent light of the imprinted molecules has open and close characteristics under an acid-base condition, the imprinted molecules located in an imprinting layer of the molecularly imprinted polymeric microspheres can be eluted, a hole structure which is complementary with the structure, the size and the functional groups of the imprinted molecules is formed in the imprinting layer, polymeric microspheres of which the imprinted molecules are eluted have specific recognition sites on target analyte molecules, target molecules enter the specific recognition sites, selective recognition on the target analyte molecules is realized, sensitivity detection of the target analyte molecules can be realized through opening and closing of the fluorescent light of the target molecules, the specific surface area of the molecularly imprintedmicrospheres is large, and space in which the recognition sites are formed is stable in structure, has more effective sites, and is capable of carrying out high-selective recognition and high-sensitive detection on the target molecules.

The invention relates to a natural carboxylate-polymer microballoon binary composite control system, and a preparation and application thereof. The binary composite control system comprises raw materials of: 0.1-0.5% of polymer microballoon, 0.05-0.5% of natural mixed carboxylate, 0.05% of suspending agent polyacrylamide and the balance of water. The binary composite control system of the invention has effects of profile control and plugging, strong oil scrubbing ability, and can effectively solve a problem of crude oil recovery ratio increase after polymer flooding and avoid damages to stratum and oil extraction equipment caused by alkali.

The invention discloses a surface imprinted polymer for catalyzing degradation of an organophosphorus pesticide and a preparation method thereof and relates to the field of surface imprinted polymers. The preparation method comprises the following steps of: preparing polystyrene seeds by a soap-free emulsion method; preparing polystyrene microspheres with particle diameter of 2 to 6 microns by a fractional swelling method; and bonding a chain transfer agent on the surfaces of the polystyrene microspheres. The preparation method comprises the main steps of: performing chloride acetylation on the microspheres with chloroacetic chloride, then aminating with ethydene diamine and then bonding the chain transfer agent with an amino; adding a template molecule under a proper solvent and performing graft polymerization on an amino acid derivative functional monomer and a cross-linking agent on the surfaces of the microspheres to form the needed polymer carrier surface template imprinted microspheres. The surface imprinted polymer with catalyzing, degrading and purifying functions on an organophosphorus compound is synthesized by taking an organophosphorus compound catalyzing and degradingreaction substrate as the template and organically combining the high-crosslinking degree insoluable porous polymeric microspheres with the template imprinting technology through a surface controllable graft hydrogel.

A trim cap for a sign cabinet such as a channel letter includes an elongated formable band along with a pressure activated adhesive layer that is connected to the band. The adhesive layer is conformable to facilitate adherence of the trim cap to the edge of a sign face of the light cabinet. Preferably, the adhesive layer comprises a pressure activated adhesive and a foam layer that includes a plurality of polymeric microspheres.

The invention relates to a method for low-density polymeric microspheres without surface permeability by suspension polymerization in-situ closing and belongs to the technical field of polymer functional materials. The low-density polymeric microspheres without surface permeability is prepared by the steps: by taking porous or hollow microspheres with low permeability on the surfaces with microchannels as seeds and by virtue of the characteristic that a monomer and a polymer have good affinity, diffusing the monomer to the surfaces of the seed microspheres to form a monomer liquid layer; and then carrying out an in-situ polymerization reaction to obtain a polymer coating to close microsphere surface channels so as to obtain the low-density polymeric microspheres without surface permeability. The polymeric microspheres closed by the method have good performances such as insulativity, light scattering, sound insulation, elasticity, compressive strength and the like and have a wide application prospect in the field of petroleum drilling additives, acid fog inhibition, ultrasound contrast reagents, photoelectric materials, adhesives, paper-making, communication and the like.

The invention belongs to the technical fields of a polymer material and analysis and relates to a phenylboronic acid polymeric microsphere, and a preparation method and application thereof on the aspect of gathering glycoprotein. The phenylboronic acid polymeric microsphere containing vinyl is prepared in a novel mixed solvent system of water and ethanol. The method comprises the following steps of: dispersing a monomer, a crosslinking agent and an initiator into a mixed solution of water and ethanol; reacting for 8-24 hours under the condition of 60-70 DEG C, so as to collect the product disclosed by the invention in a reaction system. The synthetic method disclosed by the invention is simple and feasible, low in cost, and friendly to environment, and is typical green reaction; and the prepared polymeric microsphere has the characteristics of good monodispersity, large in specific surface area, strong specificity and the like, and can be used for separating or gathering glycoprotein with 1,2-cis diol structures.