1399 results about "Solvent evaporation" patented technology

Buckyrock is a three-dimensional, solid block material comprising an entangled network of single-wall carbon nanotubes (SWNT), wherein the block comprises greater than 75 wt % SWNT. SWNT buckyrock is mechanically strong, tough and impact resistant. The single-wall carbon nanotubes in buckyrock form are present in a random network of individual single-wall carbon nanotubes, SWNT “ropes” and combinations thereof. The random network of the SWNT or SWNT ropes can be held in place by non-covalent “cross-links” between the nanotubes at nanotube contact points. In one embodiment, SWNT buckyrock is made by forming a SWNT-water slurry, slowly removing water from the slurry which results in a SWNT-water paste, and allowing the paste to dry very slowly, such that the SWNT network of the SWNT-water paste is preserved during solvent evaporation. Buckyrock can be used in applications, such as ballistic protection systems, involving light-weight material with mechanical strength, toughness and impact resistance.

An alcohol based hand surgical scrub, which includes cationic anti-microbial agent preservatives, cationic polymer film-forming agents and a skin emollient, and provides a long term residual, anti-microbial “invisible glove” on the skin. The composition provides an immediate reduction in bacterial microbes. The polymer system creates an invisible film on the skin following solvent evaporation. This invisible film provides a lasting anti-microbial barrier on the skin which acts to prevent microbial growth.

A composite magnetic nanoparticle drug delivery system provides targeted controlled release chemotherapies for cancerous tumors and inflammatory diseases. The magnetic nanoparticle includes a biocompatible and biodegradable polymer, a magnetic nanoparticle, the biological targeting agent human serum albumin, and a therapeutic pharmaceutical composition. The composite nanoparticles are prepared by oil-in-oil emulsion / solvent evaporation and high shear mixing. An externally applied magnetic field draws the magnetic nanoparticles to affected areas. The biological targeting agent draws the nanoparticles into the affected tissues. Polymer degradation provides controlled time release delivery of the pharmaceutical agent.

Oral vaccine formulations are disclosed having microparticles sized such that at least 50% of the microparticles are less than 5 mum, preferably less than 3 mum, the microparticles containing antigen entrapped or encapsulated, such as by a solvent evaporation method, by a biodegradable polymer, such as poly (D,L-lactide-co-glycolide). Additionally, oral vaccine formulations are disclosed having nanoparticles sized such that at least 50% of the microparticles are less than 600 nm, preferably less than 500 nm, the nanoparticles containing antigen entrapped or encapsulated, such as by a coacervation method, by a biodegradable polymer, such as poly (D,L-lactide-co-glycolide). Protective vaccine formulations containing the B. pertussis antigens PTd or a combination of PTd and FHA are provided.

The present invention relates to a novel antiozonant as well as antioxidant based on functionalized hindered phenol and the process for the preparation thereof of formula 1wherein R1 is tert-butyl and R2 and R3 are C1 to C8 linear or branched alkyl. The present invention also relates to a process for the preparation thereof comprising dissolving a compound of formula 3wherein R1 is tert-butyl, with liquid bromine in a non polar organic solvent at temperature range 80 to 95° C. for a period of 4 to 7 hours, evaporating the solvent under reduced pressure to obtain a compound of formula 2wherein R1 is a tertiary butyl group and X is Br, reacting the compound of formula 2 with a compound of formula 4wherein R2 and R3 are C1 to C8 linear or branched alkyl, dissolved in an organic solvent in presence of a suitable mild base at a temperature ranging from 80 to 95° C. for a period of 4 to 7 hours, bringing the reaction mixture to room temperature, separating the organic layer and concentrating the product by solvent evaporation under reduced pressure and purifying the final product by column chromatography to obtain compound of formula 1.

Methods, apparatus, and systems of fabricating ordered or hierarchically ordered small-scale structures (e.g. micro- or sub-micro size) without the need for lithographic techniques or external fields. The methods use irreversible solvent evaporation to deposit the solute on a surface. A spherical lens is brought down into contact with the droplet. By selection and control of one or more relevant parameters, various characteristics or features of the resulting structures can be controlled. Nano-scale structures or materials can be formed or included in the micro- or sub-micro-scale formed structures. The nano-scale structures or materials can self-assembly in hierarchical order by selection and control of certain process parameters.

Biodegradable delivery systems of physiologically, pharmacologically and biologically active substance(s) (BAS) are provided. These systems are obtained by incorporating the BAS into a blend of biodegradable polymers and plasticizers using a novel solvent evaporation method. This method involves dissolving the biodegradable polymer or copolymer and a plasticizer into a volatile solvent. The BAS may then be added to this mixture. The volatile solvent is removed using vacuum or at an elevated temperature or using a combination of both vacuum and elevated temperature. The resultant mixture is a BAS-loaded formulation which when injected, implanted or applied in vivo in an animal or human, provides controlled release of the BAS over the desired period of time. Alternatively, a blank formulation may be first prepared by the aforementioned methodology without incorporating the BAS in the formulation. An appropriate quantity of BAS is then added to this formulation to yield a BAS-loaded formulation which may control the release of the BAS for the desired length of time.

Combinations of solubilized, covalently crosslinked, siloxy-containing polymers in a solvent system of a volatile hydrophobic (non-polar) liquid that is non-stinging to a user are excellent non-irritating liquid coating materials for forming films, which, after solvent evaporation, are water insoluble but water-vapor permeable and lightly adherent to surfaces such as skin and mucous membranes. The crosslinking content is greater than 1 weight % and can be as much as 16 weight %. In comparison to non-crosslinked polysiloxy films, or crosslinked films of 1 weight % or less, the enhanced crosslinked polysiloxy films, while continuing to be soluble in the solvent, have reduced tack and reduced adhesion to skin and can act as sacrificial coatings under strongly adherent pressure sensitive adhesives.

The present invention is an apparatus and process for storing and delivering a low vapor pressure process chemical to a process tool for semiconductor fabrication, comprising: a) a bulk container for storing the process chemical; b) a process container for delivering the process chemical to the process tool; c) a first manifold for delivering process chemical from the bulk container to the process container; d) a solvent container containing a quantity of solvent, e) a second manifold for delivering the process chemical from the process container to a process tool; f) a solvent recovery container for containing used solvent and removed process chemical, and, g) a solvent evaporator to differentially remove solvent from process chemical in the solvent recovery container by entrainment in a carrier gas, vacuum removal, heating or combinations thereof. The containers can be baffled on their inert gas inlets. The cabinet can be heated.

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 current collector for use in a capacitor having an aqueous or non-aqueous electrolyte, such as an aqueous sulfuric acid electrolyte. The conductive basis of the current collector may be manufactured from a number of conductive metals but, preferably, is comprised of lead or a lead alloy. The portion of the conductive basis that will be in contact with the electrolyte is provided with a protective layer that is created by deposition of one or more layers of one or more protective coating materials thereto. Each protective coating material is comprised of at least a conductive carbon powder and a polymer binder that is resistant to the electrolyte. Preferably, but not essentially, the protective coating material(s) are applied to the conductive basis in the form of a paste, which is subsequently subjected to a solvent evaporation step and a thermal treatment step. The resulting protective layer is also substantially devoid of pores through which the electrolyte can permeate.

The invention relates to a latent microcapsule curing agent initiating thermosetting epoxy resin curing at medium temperature and a preparation method of an adhesive thereof. The latent microcapsule curing agent is technically characterized in that the high-activity medium temperature curing agent is taken as a core material, thermoplastic high polymer microspheres are taken as a wall material, the solvent evaporation technology is adopted for preparing the latent microcapsule curing agent with better curing performance and latent performance, and the latent microcapsule curing agent can be applied to an epoxy resin system for preparing the single-component medium temperature curing epoxy resin adhesive. Microcapsules prepared by the method are high in capsule core content, smooth in surfaces, narrow in particle size distribution and good in compatibility with matrix epoxy resin and can be better dispersed in the epoxy resin; and the prepared single component adhesive can realize curing at the medium temperature, the storage period at room temperature is longer and the tensile shear strength performance can be further improved.

The invention discloses a preparation method for an ordered mesoporous carbon / tungsten carbide composite material and a supported catalyst thereof. In the method, an organic matter and a tungsten salt are separately used as a carbon source and a tungsten source, and the carbon source and the tungsten source are mixed with a surfactant; and a precursor of the ordered mesoporous carbon / tungsten carbide is synthesized by a solvent-evaporation induced self-assembly method, and then the precursor is subject to high-temperature treatment in the inert atmosphere to form the ordered mesoporous carbon / tungsten carbide composite material. The ordered mesoporous carbon / tungsten carbide composite material prepared by the method has the characteristics of high degree of order, narrow aperture distribution, large specific surface area (greater than 500 m<2> / g) and the like. The invention further comprises a supported catalyst prepared by supporting active components on the ordered mesoporous carbon / tungsten carbide composite material which is prepared by the method; and because of the synergistic effect and the structure effect of the ordered mesoporous carbon / tungsten carbide composite material, the catalyst has higher methanol electro-oxidation catalytic activity than a commercial carbon platinum-ruthenium catalyst.

This invention relates to rapid drying coating compositions that are particularly useful for automotive and truck refinish applications; the coating composition is pigmented and contains a branched acrylic polymer and is particularly useful as a basecoat for a basecoat clear coat finish; the coating composition may preferably be used as a lacquer coating, which dries via solvent evaporation absent any substantial crosslinking occurring or it optionally may contain a polyisocyanate crosslinking agent and be used a clear topcoat.

The present invention discloses a substantially amorphous pharmaceutical composition comprising a drug that can exist in a variety of polymorphic forms and a pH sensitive polymer, which inhibits the crystallization of the drug during formulation and reconstitution. Polymers of higher molecular weight are more effective at lower loading, especially when the drug polymer matrix is prepared by the solvent evaporation or solvent extraction technique. The compositions used as dry syrups maintain bioavailability of the drug and effectively mask the taste of the drug when the composition is reconstituted.

This invention describes a new concept of flexible template-directed microporous partially pyrolyzed polymeric membranes which have greatly improved performance in separation of gas pairs compared to their precursor polymeric membranes. Organic hosts, such as crown ethers, cyclodextrins (CDs), calixarenes (CXs), and spherands, or polymeric additives, such as poly(ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) were used as the micropore-forming templates. Micropore-forming template / polymer blend membranes comprising organic micropore-forming templates embedded in a polymer matrix were prepared by dissolving the organic micropore-forming templates in the polymer solution followed by solution-casting and solvent evaporation or solvent exchange. Low-temperature selectively pyrolyzing micropore-forming templates in the micropore-forming template / polymer blend membranes at a nitrogen flow resulted in the formation of flexible microporous partially pyrolyzed polymeric membranes.

The invention relates to a gradient laminated porous scaffold based on microsphere selective laser sintering and a preparation method thereof. The scaffold is prepared by taking polymer microspheres and compound microspheres of high polymers and calcium-phosphate materials as sintering raw materials and carrying out selective laser sintering on the sintering raw materials, the contents of the calcium-phosphate materials in the scaffold are ascended in a layer by layer manner from the surface layer to the bottom layer of the scaffold, and bore diameters and porosities of the scaffold are gradually ascended. The preparation method comprises the following steps of: preparing calcium-phosphate materials / high polymer composite microspheres by a solvent evaporation method; designing a three-dimensional model of the gradient-laminated porous scaffold by computer modeling software; and realizing precise manufacturing of the gradient laminated porous scaffold by virtue of a selective laser sintering device through feeding controlling and single-layer manufacturing. The mutual communication and the gradient distribution of the scaffold are beneficial for nutrient transport and tissue penetration; and the contents of calcium-phosphate materials are in continuous gradient distribution in space, the disadvantage of interface bonding strength is effectively solved, and the biological functions of the scaffold in comprehensive defect repairing of cartilages and subchondral bones are beneficially exerted.

Electro-optic structures are constructed by spin coating water based emulsions or solvent based sensor materials, preferably a solvent-based polymer dispersed liquid crystal (PDLC), onto a substrate under conditions of controlled solvent evaporation. In a particular process, the uniformity of the PDLC coating is achieved by 1) spin coating in a semi-sealed chamber, 2) “converting” a square substrate into round substrate by using a fixture; 3) providing a controllable distance between the substrate and a spin coater top cover; and 4) providing a controllable solvent evaporation rate.

The invention discloses a supported polypropylene imine material and a preparation method and application thereof. The material is formed by supporting polypropylene imine in a porous carrier material, wherein the mass ratio of the polypropylene imine to the porous carrier material is 0.1-2:1. The polypropylene imine one or random mixture of first generation, second generation or third generationpolypropylene imines taking ethylene dimine, butyl diamine, hexanediamine or diethylenetriamine as a core. The polypropylene imine is supported on the porous carrier material such as porous silica gel, active alumina, silicon-based ordered mesoporous material SBA-15, MCM-41 or active carbon or the like by a physical dipping-solvent evaporation method or a chemical method; and the material can be used as an adsorbent for catching and separating acid gas such as CO2, SO2 or H2S or the like from a gas mixture. The adsorbent has the advantages of quick and efficient adsorption, high adsorption capacity, high selectivity, recycle and the like.

The invention belongs to the field of advanced nano-sized porous materials and techniques, in particular relates to an ordered mesoporous metal oxide material with ultra-large aperture and a preparation method thereof. According to the invention, a block copolymer with ultrahigh-molecular-weight hydrophobic segments is used as a template agent for the mesoporous material, and based on the principle of ligand-assisted self-assembly, the microphase separation of the ultrahigh-molecular-weight hydrophobic segments from hydrophilic phases occurs during the solvent evaporation process, to form an ordered mesoscopic structure. A variety of materials are used for synthesizing the mesoporous material, such as titanium dioxide, aluminum oxide and zinc oxide. The synthesized mesoporous material retains the order of mesopores and has an extremely large aperture not less than 20 nm. The invention provides an effective and convenient method for synthesizing ultra-large aperture mesoporous materials. The material and the synthesis method of the material have wide application prospect in various fields. The method is simple, has easily-available raw materials, and is suitable for large-scale production.

The invention provides a biological dressing for treatment of a condition of the skin, mucosa, teeth or other tissue within or proximate to the oral cavity of a subject, the biological dressing comprised of a gum resin, a topically acceptable volatile solvent, and an oral care agent. The gum resin is present in a suitable amount that the composition, when the solvent evaporates, will dry to form a solid coating that sticks to the tissue to which the composition is applied and maintain the oral care agent over a sustained period of time in contact with sites on the tissue exhibiting symptoms of the condition. Methods are provided for treating symptoms of oral condition with such a oral care composition.

The invention relates to a humidity sensor based on nano material film. The humidity sensor comprises a flexible polymer substrate, a comb-like interdigital electrode, a graphene based humidity sensitive film, a humidity sensitive film resistor pickup circuit board, a circuit signal line and an air hole casing. The graphene based humidity sensitive film is a multilayer network film composed of a static induced self-assembly polyelectrolyte precursor and a solvent evaporation induced self-assembly graphene film, and prepared on surfaces of the flexible polymer substrate and the comb-like interdigital electrode to form a humidity sensitive film sensing element. The film resistor pickup circuit and the humidity sensitive element are electrically connected together through a contact pin mode; the humidity sensitive element and the signal pickup circuit board are fixed through screws and nuts, and arranged in air hole plastic casing; and the circuit signal line is lead out through a casing lead hole to realize functions of data acquisition, storage, display and alarm. The sensor has the characteristics of stability, reliability, low cost, high sensitivity, good repeatability, and high speed of humidity sensitive response and recovery, etc.

The invention discloses a preparation method of a polyene-containing taxol nanoparticle mixed micelle preparation and a freeze-drying agent, which prepares docetaxel PLA-PEG nanoparticles or micelle or nanoparticle mixed micelle through a modified solvent evaporation method, takes PLA-PEG copolymer as a carrier, and wraps docetaxel in a PLA hydrophobic core. When in use, the docetaxel PLA-PEG containing long cycle freeze-dried preparation only needs to be added with water and is dissolved, and uniform nanoparticle suspension, micellar solution or mixed micellar nanoparticle suspension can be prepared. The preparation method does not need tween-80 and ethanol solubilization, only takes the biodegradable PLA-PEG as the carrier, and does not contain any surfactant; and compared with the docetaxel injection on sale, the preparation can reduce the toxicity and the adverse reactions of the medicine, and improve the clinical application safety of the medicine.

The present invention relates to a SOG (Spin-On-Glass) dispensing system and its controlling sequences and, more particularly, to a SOG dispensing system allowing for continuous production and its controlling sequences According to the present invention, a buffer tank, whose wall is set a plurality of level sensors at different level heights, is connected between a source tank with a SOG bottle inside and a coating unit of prior art and then SOG is supplied for a time interval from the source tank into the buffer tank by control signals from these level sensors. Besides, the buffer tank is surrounded with a cooling unit to provide a low temperature enviroment allowing for prolonging life time of SOG and preventing organic solvent inside SOG from evaporating and then crystallizing to form contamination particles at wall of the SOG dispensing system. Thus, the resultant SOG dispensing system, according to the present invention, can resolve a shortcoming of discontinuous production of prior art due to a need for changing the SOG bottle, as well as another shortcoming of residue of the SOG bottle, thereby considerably raising operating efficient of the dispensing system by reducing its idle time and lowering fabrication cost by saving a SOG waste.

The invention relates to a preparation method of high solid content waterborne polyurethane. The waterborne polyurethane is higher than common organic solvent in latent heat of evaporation, and water solvent type polyurethane in waterborne polyurethane of the same solid content is slow in solvent evaporation and needs long drying time. The preparation method comprises the steps of mixing polymer polyol with polyisocyanates under the protection of nitrogen, stirring evenly and then adding catalyst for reacting; adding a hydrophilic chain extender for reacting; cooling, adding a solvent and a neutralizer so as to obtain a prepolymer and stirring at high speed so as to disperse in deionized water; adding the chain extender, stirring, reducing pressure and removing the solvent through steaming so as to obtain the waterborne polyurethane emulsion; and preparing the prepolymer of different size distribution, dispersing in the waterborne polyurethane emulsion along with velocity mixing, and stirring for 1-4 hours. The waterborne polyurethane emulsion has wide size distribution and low viscosity, is stable, and can solve the key technical problems of high latent of evaporation, slow volatilization, long drying time, low production efficiency and the like in the field of research of the waterborne polyurethane.

A method and apparatus for recycling and recovering potentially explosive solvents includes providing a contaminated solvent to a distillation tank, vaporizing the solvent in the distillation tank, thereby producing solvent vapor, condensing the solvent vapor, and adding a free radical scavenger substance to the distillation tank during the heating step. The vapor is then condensed and collected in a clean solvent tank where additional free radical scavenger substance is added to the clean solvent tank. Preferably, contaminated solvent is introduced into the solvent recovery system by providing contaminated solvent into contaminated solvent tank which is connected to the distillation tank, and an oxygen displacer substance is provided to the contaminated solvent tank and the clean solvent tank so as to minimize the amount of free oxygen in the tanks.

[Object] To obtain an alignment film having excellent alignment stability of a liquid crystal and a high voltage holding ratio by application of linearly polarized light to a polyamic acid having a specific structure and then imidization under heat. [Solving Means] A photo-alignment film is obtained by: applying a polyamic acid solution on a substrate, where the polyamic acid contains, in its main chain, at least a group having unsaturated groups having 1 to 3 carbon-carbon double bonds or 1 to 4 triple bonds; vaporizing a solvent from a film formed; applying linearly polarized light to the film after the vaporization of the solvent; and then heating the film to imidize the polyamic acid.

The invention relates to a composite cathode material for a sodium battery and a preparation method of the composite cathode material. The preparation method comprises the steps that tin salt, a sulphur source and a carbon source are added to a solvent to be mixed; a heating reaction is carried out, or the solvent is evaporated out, then the heating reaction is carried out in the inertia protective atmosphere, or the heating reaction is firstly carried out, and then solids are separated out to be heated in the inertia protective atmosphere; SnS and / or SnS2 and a conductive composite product of a carbon material are obtained through the reaction. By means of the method, the problem about volume expansion of a sodium-tin alloying reaction is effectively relieved, and the circulating stability and rate capability of the material are improved.

The invention discloses a kernel-shell structural nanofiber membrane, a preparation method thereof and an application; the preparation method includes steps of (1), preparation of spinning; dissolving sodium alginate, polyoxyethylene and poloxamer F127 in distilled water, stirring evenly and acquiring shell layer spinning solution; mixing the chitosan nanoparticle solution loaded with active matters with polyving akohol solution evenly, and acquiring the kernel layer spinning solution; (2), coaxial electrostatic spinning: respectively injecting the shell layer spinning fluid and kernel layer spinning fluid in a static spinning device containing a coaxial needle, performing the coaxial electrostatic spinning under room temperature, performing solvent evaporation in the spinning process, and acquiring the kernel-shell structural nanofiber membrane loaded with the nanoparticle. The preparation method is simple in operation and gentle in reaction condition and can well control the slow release of the active matter; moreover, the prepared colon targeting controlled release system has obvious colon targeting property, thereby improving the utilization degree of the active matter. The colon targeting controlled release system can be applied to functional food domain.