82 results about "Membrane composition" patented technology

Embodiments of the invention provide analyte sensors having elements designed to modulate their chemical reactions as well as methods for making and using such sensors. In certain embodiments of the invention, the sensor includes an analyte modulating membrane that comprises a blended mixture of a linear polyurethane/polyurea polymer, and a branched acrylate polymer.

Compositions and processes are disclosed for economical separation of fluid mixtures. Broadly, the present invention discloses ionic polymer compositions that are useful for perm-selective membrane separations. More particularly, ionic polymers of the invention comprise a plurality of repeating structural units having as a constituent part thereof organic ionic moieties consisting of nitrogen containing anions and/or cations. In the form of non-porous membranes, ionic polymers of the invention facilitate recovery of purified organic and inorganic products from fluid mixtures by means of perm-selective membrane separations. The present invention also provides methods for forming the ionic polymers, for example by treating selected nitrogen-containing organic polymers with acids, or treating a polymeric material comprising a plurality of carboxylate groups with an amine. Ionic polymer compositions of the invention are particularly useful for simultaneous recovery of a permeate product of an increased concentration, and a desired non-permeate stream, from a fluid mixture containing at least two compounds of different boiling point temperatures.

A method of preparing an amniotic membrane extract including the steps of obtaining a healthy amniotic membrane from a pregnant mammal, such as a pig, cow, horse or human, homogenizing the membrane to obtain a homogenate solution, freezing the homogenate solution, and lyophilizing the frozen homogenate solution to dryness is disclosed. Preferably, the lyophilized homogenate is pulverized to a powder. The lyophilized homogenate is then reconstituted before use, e.g., in a liquid, such as a balanced salt solution or fresh amniotic fluid, or in another substance, such a gel, an ointment, a cream or a soap, depending on the intended use. Also disclosed is a pharmaceutical composition prepared according to the method of the invention, for prophylaxis and/or treatment of a disease or condition, especially of the eye or the skin. Exemplary pharmaceutically acceptable carriers for the composition of the invention include an ophthalmic solution for eye drops, a gel, an ointment, an emulsion, a cream, a powder and a spray.

The invention discloses an antistatic polyolefin permeable film compound and a process for preparing the antistatic polyolefin permeable film. The compound comprises 30-60 parts by weight of linear low density polyethylene, 10-40 parts by weight of high-pressure polyethylene, 30-60 parts by weight of antistatic resin, 100-180 parts by weight of calcium carbonate and 0.4-1.0 parts by weight of anti-oxidant. The invention overcomes the weakness of traditional antistatic agent and antistatic filling, not only ensures the antistatic property of permeable film through adding antistatic resin, but also not affects the processing property, permeable property and the appearance of film. The processing flow-ability, the dispersing evenness of organic filling and processing stability of antistatic polyolefin permeable film compound in the invention can meet the production requirements of extrusion filmmaking. The water vapor permeable rate of the antistatic polyolefin permeable film which is prepared by the invention is not lower 2000g/m2 24h, and the surface electrical resistivity is no higher 10 9 omega/m2.

A membrane composition comprising an inorganic substrate which has a coating of an associating polymer. The membrane composition includes an inorganic substrate selected from the group consisting of a porous silica hollow tube, an alumina hollow tube and a ceramic monolith.

Compositions and processes are disclosed for economical separation of fluid mixtures. Broadly, the present invention discloses ionic polymer compositions that are useful for perm-selective membrane separations. More particularly, ionic polymers of the invention comprise a plurality of repeating structural units having as a constituent part thereof organic ionic moieties consisting of nitrogen containing anions and/or cations. In the form of non-porous membranes, ionic polymers of the invention facilitate recovery of purified organic and inorganic products from fluid mixtures by means of perm-selective membrane separations. The present invention also provides methods for forming the ionic polymers, for example by treating selected nitrogen-containing organic polymers with acids, or treating a polymeric material comprising a plurality of carboxylate groups with an amine. Ionic polymer compositions of the invention are particularly useful for simultaneous recovery of a permeate product of an increased concentration, and a desired non-permeate stream, from a fluid mixture containing at least two compounds of different boiling point temperatures.

Chronic alcoholism is a diverse and heterogeneous disorder that can be dichotomized into cognitively intact and cognitively impaired subgroups. At a molecular level, ethanol has been shown to have both acute and chronic effects on: Membrane biophysical properties, Membrane composition and metabolism, Protein phosphorylation, Lipid metabolic signaling, Lipoprotein transport of cholesterol. Actual molecular underpinnings are determined for cognitive impairment seen in some chronic alcoholism subjects including molecular/metabolic alterations of phospholipid and ganglioside metabolisms.

The present disclosure relates to bioactive biomatrix compositions. In one embodiment, the biomatrix composition is derived from human amniotic membrane. This biomatrix is ​​called HuBiogelTM. The HuBiogel™ composition precisely mimics the composition of naturally occurring basement membranes and is capable of supporting a variety of cell types in vitro and in vivo. The disclosed HuBiogel™ biomatrix contains laminin, collagen I, and collagen IV in one embodiment, and may further contain any combination of the following: nestin, tenascin, fibronectin, and proteoglycans . The biomatrix composition is substantially free of endogenous growth factors and proteolytic enzymes. The present invention also describes two-dimensional and three-dimensional culture systems and physiological/pathological model systems using HuBiogel™ compositions. HuBiogel(TM) compositions may be modified to contain desired growth stimulators, such as growth factors, polypeptides and small organic molecules, and may also contain growth inhibitory and/or therapeutic agents.

Non-immunogenic biocompatible macromolecular sheet composition are formed from a cellulosic membrane, a binding moiety having a plurality of functional groups, and a glycosaminoglycan (GAG). The binding moiety has the formula of R1-X-R2 wherein R1 and R2 are the same or different. The binding moiety, through functional groups binds the cellulosic membrane with the glycosaminoglycan. R1 is covalently bound to a carbon or an oxygen of the cellulosic membrane. R2 is covalently bound to a carbon, an oxygen, or a nitrogen of the glycosaminoglycan. The binding moiety can be bis-oxyrane, butanediol-diglycidyl ether (BDE), or divinyl sulfone. The cellulosic membrane can be a cellulosic membrane, partially acetylated cellulose and a copolymer of hydroxyethyl-methacrylate with methyl methacrylate, abbreviated as HEMA-MMA. The non-immunogenic biocompatible macromolecular sheet composition can be formed into a pouch to encapsulate cells, tissues, pharmaceuticals, or biological metabolic products. In addition, the non-immunogenic biocompatible macromolecular sheet composition can also be used as a skin graft or a skin substitute. Further, these non-immunogenic biocompatible macromolecular sheet composition can also be used as a surface to culture cells in vitro.

A void reducing asphalt membrane composition for asphalt pavements that includes: an asphalt binder; an elastomeric polymer; a wax modifier; and at least one of: i) fumed silica or fumed alumina; and ii) a saponified fatty acid and a resin acid gelling compound. The composition is resistant to flow when applied and migrates into hot mix asphalt in the area of the longitudinal joint to reduce air voids to 7% or less and reduce water permeability. The composition becomes tack-free quickly after application. The composition bonds to asphalt, concrete, brick, stone and metal.

Disclosed is a polyurethane composition in film membrane use, comprising thermoplastic polyurethane with 95%~50% in mass and modifier with 5%~50% in mass; also discloses the application of the polyurethane composition in coextruded film preparing. The polyurethane coating in said polyurethane film membrane composition can be prepared by heat bonding between the film membrane formed by raw material and base material; also can by coating the raw material directly on the base and then for the heat bonding. The material is characterized in that it can not only change the fusing point of the film material, which can meet demand in heat bonding process; but can also modifies the strip power between the thin layer of polyurethane and other base material and control the water vapour permeability of the composite product of this kind.

The invention relates to a durable polyvinyl chloride salt membrane composition and a preparation method thereof and belongs to the technical field of high polymer materials. The durable polyvinyl chloride salt membrane is prepared from the following raw materials in parts by mass: 100 parts of polyvinyl chloride, 3-8 parts of stabilizer, 20-100 parts of plasticizer, 5-25 parts of low temperature modifier, 0.2-1.0 part of lubricating agent, 0.2-2.0 parts of antioxidant, 0.2-2.0 parts of light stabilizer, 1-5 parts of light screener and 0.2-2.0 parts of colouring agent. The preparation method comprises the processes of mixing raw materials, pelleting and calendaring or comprises the processes of mixing raw materials and calendaring. The durable polyvinyl chloride salt membrane adopts a migration-resistant plasticizer and the low temperature modifier, so that the salt membrane can have good durability and low temperature flexibility and can not be crisp after being used for a long time; and a production technology is simple, and the produced thin film has high cost performance.

The present invention relates to biologically active compositions and methods for the lyophilization and reconstruction of virosomes comprising special membrane compositions. These compositions are essential to the invention and provide superior freeze-drying stress-resistance for the virosomes of the invention.

Gas separation membrane compositions including at least one crosslinked polymer, gas separation membranes made of such compositions, methods for making such gas separation membranes, and methods of using such membranes to separate gases are described. In one embodiment, the crosslinked polymer includes polyarylene ethers (PAE).

A multi-layer coated equipment in nanometer level which consists of the following parts: evacuated chamber, cylinder framework for clapboard with aperture, at least four pieces of clapboards which were fixed on cylinder framework, dividing the evacuated chamber into at least four disconnecting chambers, central pump-line with aperture , at least two evaporating plants and one ion source which were fixed on evacuated chamber wall, at least four work rests each of which was fixed in one disconnecting chamber separately, single-core multi-spindle magneto fluid gearing and bleeding point. All the clapboards, cylinder framework and work rests can do synchronous revolution by sharing one revolution axis. This equipment can be used to deposit multilayer membrane in nanometer level and to modulate membrane composition and thickness. Advantages are component singleness in each membrane and sharp and clear interface among different membranous layers. It can be used in surface peening of die and other parts.

The invention relates to an inorganic nanoparticle in-situ modified polybenzimidazole proton exchange membrane and a preparation method thereof. The proton exchange membrane composition comprises an in-situ polymerized polybenzimidazole polymer, stereoscopic cage-structure polysilsesquioxane nanoparticles with eight amino acids, and doped phosphoric acid. In the composition, the adsorbed phosphoric acid exists in the form of ionic chemical bonds, so that protons can be transferred through abundant phosphoric acid in the proton exchange membrane, and the conductivity can not decrease due to the loss of the phosphoric acid; and besides, the introduced siloxane has very high water absorption and water retaining capacities, thereby enhancing the properties of the proton exchange membrane and prolonging the service life.

Nanofilms useful for filtration are prepared from oriented amphiphilic molecules and oriented macrocyclic modules. The amphiphilic species may be oriented on an interface or surface. The nanofilm may be prepared by depositing or attaching an oriented layer to a substrate. A nanofilm may also be prepared by coupling the oriented macrocyclic modules to provide a membrane.

The present invention provides a method for the in vitro determination of the ability of a compound or a mixture of compounds to permeate the blood-brain barrier and a membrane composition useful therefor.

The invention relates to an inorganic nanoparticle in-situ modified polybenzimidazole derivative proton exchange membrane and a preparation method thereof. The proton exchange membrane composition comprises an in-situ polymerized polybenzimidazole derivative polymer (poly(2,5-benzimidazole)), stereoscopic cage-structure polysilsesquioxane nanoparticles with eight amino acids, and doped phosphoric acid. In the composition, the adsorbed phosphoric acid exists in the form of ionic chemical bonds, so that protons can be transferred through abundant phosphoric acid in the proton exchange membrane, and the conductivity can not decrease due to the loss of the phosphoric acid; and besides, the introduced siloxane has very high water absorption and water retaining capacities, thereby enhancing the properties of the proton exchange membrane and prolonging the service life.

Devices, methods, and kits for easy, accurate, and fast estimation of soil microbial load are provided. The devices include membranes that are rapidly wettable with aqueous fluids and retain soil microorganisms of up to 200 micrometers in size, without retaining soil pigments. The method requires reconstituting a soil sample in an extraction fluid so that the microorganisms in the soil sample are released from particles of the soil sample and into the extraction fluid. The method does not require a filtration step. The extraction fluid containing the microorganisms suspended therein is then pipetted onto the membrane device, or the membrane is dipped into the extraction fluid. The color appearing on the membrane is then compared to color intensity gray scale strips to determine the soil microbial load.

The invention provides a blue membrane composition, uncured glue, a blue basal membrane, a preparation method for the blue basal membrane, a wave filter and a camera module. The blue membrane composition comprises a resin main body, a blue dye and a solvent, wherein the blue dye has the maximum absorption wavelength of 500nm to 800nm and has intermiscibility with the resin main body; and the resin main body and the blue dye are dispersed in the solvent. The membrane prepared from the blue membrane composition can exert the same action as that of a blue glass substrate; meanwhile, the phenomenon that only expensive blue glass substrates produced by Japan can be adopted in the wave filter is avoided; and the prepared membrane is relatively light in weight, relatively small in size and convenient to cut.

The invention discloses a carbon fiber granule methacrylic resin/epoxy resin waterproof membrane composition and method. The composition is composed of a component A and a component B, wherein the component A is composed of modified methyl-methacrylate (MMA) resin, a modified low-viscosity epoxy phenolic resin, superfine carbon fiber granules, titanium white, carbon black, ceramic powder, a polyacrylamide dispersing agent, an organosilicon flexibilizer, a water-resistant cyanoacrylate connector and a polyethylene wax anti-settling agent, totaling 100 parts by mass. The component B is composed of ethylenediamine, alicyclic amine, isocyanate and a polyamide accelerator, totaling 20 parts by mass. The composition has higher strength and higher flexibility than the past common MMA resin. By adding the superfine carbon fiber granules and special-type epoxy resin, the spray-type elastic waterproof membrane fused with the high-performance MMA resin can be quickly cured and formed at normal temperature or low temperature, is applicable to the ambient temperature of -40 to 1000 DEG C, and has excellent wear resistance and corrosion resistance.