170 results about "N-Vinylpyrrolidone" patented technology

An electrode providing electrical contact with a patient's skin includes a conductive member adapted for connection to an external electrical apparatus and a non-liquid film for electrically interfacing to said patient's skin, the liquid film being electrically and mechanically connected to said conductive member. The non-liquid film includes an electrically conductive organic polymer plasticized with a polyhydric alcohol with said organic polymer being derived from a monomeric mixture comprising from about 15 to 30 pph acrylic acid, 0.5 to 30 pph N-vinylpyrrolidone and 0.01 to 2 pph of a crosslinking agent. The monomeric mixture may further comprise from about 0.5 to 8 pph of a thickening agent selected from the group consisting of N-vinylpyrrolidone / acrylic acid copolymers, N-vinylpyrrolidone / vinylacetate copolymers, and N-vinylpyrrolidone / vinylimidazole copolymers.

A shaped body of detergent composition comprising a chemically and / or physically cross-linked dissolution retarding agent, and at least one of a surfactant and / or builder. The dissolution retarding agent is preferably a copolymer of N-vinylpyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid and a cross-linking agent, or a salt thereof. The shaped bodies dissolve predominantly in the main wash of an automatic washing process and do not dissolve significantly in the pre-wash and are of particular application in automatic dishwashing.

A method comprising the steps of: (A) forming a fluid comprising a crosslinked polymer, wherein the crosslinked polymer comprises: (i) a first monomeric unit of one or more N-vinyl lactams; and (ii) a crosslinker selected from the group consisting of: divinyl ether, diallyl ether, vinyl or allyl ethers of polyglycols or polyols, divinylbenzene, 1,3-divinylimidazolidin-2-one, divinyltetrahydropyrimidin-2(1H)-one, dienes, allyl amines, N-vinyl-3(E)-ethylidene pyrrolidone, ethylidene bis(N-vinylpyrrolidone), and any combination of any of the foregoing; and (B) introducing the fluid into a portion of a well. The crosslinked polymer may additionally comprise: a second monomeric unit selected from the group consisting of: acrylamide, N-substituted acrylamides, methacrylamide, N-substituted methacrylamides, acrylates, methacrylates, acrylic acid, methacrylic acid, N-vinylamides, N-allyl amides, vinyl alcohol, vinyl ethers, vinyl esters, allyl alcohol, allyl ethers, allyl esters, vinylpyridine, vinyl sulfonates, allyl sulfonates, vinylimidazole, allylimidazole, diallyldimethylammonium chloride, and any combination of any of the foregoing.

An electrode providing electrical contact with a patient's skin includes a conductive member adapted for connection to an external electrical apparatus and a non-liquid film for electrically interfacing to said patient's skin, the liquid film being electrically and mechanically connected to said conductive member. The non-liquid film includes an electrically conductive organic polymer plasticized with a polyhydric alcohol with said organic polymer being derived from a monomeric mixture comprising from about 15 to 30 pph acrylic acid, 0.5 to 30 pph N-vinylpyrrolidone and 0.01 to 2 pph of a crosslinking agent. The monomeric mixture may further comprise from about 0.5 to 8 pph of a thickening agent selected from the group consisting of N-vinylpyrrolidone / acrylic acid copolymers and N-vinylpyrrolidone / vinylacetate.

The invention is related to a method for producing silicone hydrogel contact lenses with having a stable coating thereon. A method of the invention comprises a water-based coating process (step) for forming a relatively-stable base coating of a homo- or copolymer of acrylic acid or C1-C3 alkylacrylic acid onto a silicone hydrogel contact lens made from a lens formulation comprising from about 35% to about 60% by weight of N-vinylpyrrolidone.

Covalently-bound, hydrophilic copolymer coatings for implants are disclosed. The copolymer coatings comprise a hydrophobic aryl acrylic monomer, a hydrophilic monomer selected from the group consisting of hydroxyalkyl (meth)acrylates, n-vinyl pyrrolidone and acrylamides, and a (meth)acrylamide reactive plasticizer.

A formulation containing a copolymer derived from a cationic monomer effectively inhibits and controls the formation of inorganic scales. Suitable copolymers include those comprising an acrylamide unit and a quaternary ammonium salt group, and optionally an acrylate and / or nitrogen heterocyclic monomer including those wherein the quaternary ammonium salt is a unit of the formula:wherein R is methyl or hydrogen; R4 is a C1 to C6 alkyl group, optionally substituted with halogen, hydroxyl and alkoxy groups, X is halogen; and R1, R2 and R3 are independently selected from the group consisting of alkyl and alkoxy groups. Suitable nitrogen heterocyclic compounds include N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, N-vinylcaprolactam, N-vinylimidazole and N-vinylpyridine. The copolymers have particular applicability in the control and inhibition of zinc sulfide or iron sulfide scales, typically formed when zinc bromide brines are used as fluids in the treatment of a gas or oil well, such as a completion fluid.

The invention discloses improvements in the so-called coated thermal flow process for reducing the pattern dimension of a patterned resist layer on a substrate to accomplish increased fineness of resist patterning, in which a coating layer of a water-soluble resin formed on the patterned resist layer is heat-treated to effect thermal shrinkage of the coating layer with simultaneous reduction of the pattern dimension followed by removal of the coating layer by washing with water. The improvement of the process is obtained by using an aqueous coating solution admixed with a water-soluble amine compound such as triethanolamine in addition to a water-soluble resin such as a polyacrylic acid-based polymer. Further improvements can be obtained by selecting the water-soluble resin from specific copolymers including copolymers of (meth)acrylic acid and a nitrogen-containing monomer such as N-vinylpyrrolidone, N-vinylimidazolidinone and N-acryl-oylmorpholine as well as copolymers of N-vinylpyrrolidone and N-vinylimidazolidinone in a specified copolymerization ratio.

A method for manufacturing a microporous film comprising the steps of: (a) providing a first polymer which is a hydrophobic thermoplastic polymer and a second polymer which is a hydrophilic polymer or copolymer of N-vinylpyrrolidone; (b) dissolving said first and second polymers in a solvent system which is compatible with both polymers, said solvent system comprising a blend of an aprotic organic solvent and an alcohol; (c) coating the resulting solution on a support; (d) effecting at least a partial drying of the resulting coating; and (e) washing the coating in an aqueous medium so as to extract at least 50% by weight of the said second polymer. Image accepting members comprising a microporous film made by the above method, and preferably comprising a support which is also microporous.

The invention relates to the technical field of medical polymer materials, in particular to a conductive hydrogel. The conductive hydrogel comprises, by weight, 20%-60% of a polymer, 20%-40% of deionized water, 2%-7% of an electrolyte, 10%-30% of a water retaining agent, 1%-5% of a tackifier, 0.03%-0.2% of an initiator, and 0.03%-1.5% of cross-linking agent, wherein by total weight, the polymer comprises 2%-15% of N-vinylpyrrolidone, 0-10% of acryloyloxyethyl trimethyl ammonium chloride, 5%-25% of 3-sulfopropyl propyl potassium acrylate salt, 3%-15% of acrylic acid, and 0%-10% of N, N-dimethylacrylamide. The invention further provides a conductive hydrogel coil made according to the formula above; the conductive hydrogel coil is good in electric conductivity in use, is well sticky to skin without causing stripping pain or with causing little stripping pain, is well biocompatible with the skin, is good in stability in use with rarity of yellowing, and may stay in certain viscosity in watery, moist or bloody environments. In addition, the invention further relates to a manufacturing method of the conductive hydrogel coil.

The invention provides a xanthan gum graft copolymer oil displacement agent as well as a preparation method and application thereof. Based on molecular design, at least two of acrylamide (AM), 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and N,N-dimethylacrylamide (DMAM) are graft-copolymerized to xanthan gum macromolecules. Since the copolymerized side chain is introduced, the viscoelasticity, heat resistance and biological stability of the xanthan gum macromolecules can be greatly enhanced; the xanthan gum graft copolymer can be used as an oil displacement agent for tertiary oil recovery simultaneously; and the solution rate of the xanthan gum graft copolymer is obviously increased, and the xanthan gum graft copolymer can not easily generate gel in brine. When the xanthan gum graft copolymer oil displacement agent is used in a high-temperature high-salinity oil reservoir, the oil displacement effect is enhanced.

The invention discloses improvements in the so-called coated thermal flow process for reducing the pattern dimension of a patterned resist layer on a substrate to accomplish increased fineness of resist patterning, in which a coating layer of a water-soluble resin formed on the patterned resist layer is heat-treated to effect thermal shrinkage of the coating layer with simultaneous reduction of the pattern dimension followed by removal of the coating layer by washing with water. The improvement of the process is obtained by using an aqueous coating solution admixed with a water-soluble amine compound such as triethanolamine in addition to a water-soluble resin such as a polyacrylic acid-based polymer. Further improvements can be obtained by selecting the water-soluble resin from specific copolymers including copolymers of (meth)acrylic acid and a nitrogen-containing monomer such as N-vinylpyrrolidone, N-vinylimidazolidinone and N-acryl-oylmorpholine as well as copolymers of N-vinylpyrrolidone and N-vinylimidazolidinone in a specified copolymerization ratio.

A process for purifying removal of acrylic acid, methacrylic acid, N-vinylpyrrolidone or p-xylene crystals from their suspension in mother liquor by means of a wash column with forced transport, whose shell of the process chamber is a metal wall, the wash column additionally being enveloped by a thermal insulation material having a water vapor barrier and a specific heat flow of >0.1 W / m2 and <10 W / m2 flowing into the process chamber through the metal wall of the wash column.

The invention relates to novel crosslinkable copolymers which are obtainable by (a) copolymerizing at least two different hydrophilic monomers selected from the group consisting of N,N-dimethyl acrylamide (DMA), 2-hydroxyethyl acrylate (HEA), glycidyl methacrylate (GMA), N-vinylpyrrolidone (NVP), acrylic acid (AA) and a C1-C4-alkoxy polyethylene glycol (meth)acrylate having a weight average molecular weight of from 200 to 1500, and at least one crosslinker comprising two or more ethylenically unsaturated double bonds in the presence of a chain transfer agent having a functional group; and (b) reacting one or more functional groups of the resulting copolymer with an organic compound having an ethylenically unsaturated group.

Agents for the temporary shaping of keratinic fibers include in a cosmetically acceptable carrier—relative in each case to the weight thereof—1 to 20 wt. % of at least one crosslinked, amphiphilic, anionic polymer comprising at least one structural unit of formula (I) as described herein and at least one structural unit of formula (II) as described herein, and 1 to 20 wt. % of at least one uncrosslinked, anionic polymer comprising at least one structural unit of formula (III) as described herein and at least one structural unit of formula (IV) as described herein, and 1 to 40 wt. % of at least one fixing non-ionic polymer from the group comprising (c1) non-ionic polymers having at least one structural element of formula (N5) as described herein, (c2) homopolymers and non-ionic copolymers of N-vinylpyrrolidone, and (c3) non-ionic copolymers of isobutene.

An antifog hydrophilic high-molecular paint is prepared from hydrophilic high-molecular material prepared from non-ionic surfactant, (methyl) acrylate, N-vinylpyrrolidone, (methyl) acrylic acid and / or (hydroxy contained (methyl) acrylate through polymerizing, solidifying agent and solidifying promoter. Its advantages are low cost, high adhesion and long service life.

The invention discloses a water-soluble temporary plugging agent for temporary blocking diversion in well fracturing. The temporary plugging agent comprises unsaturated organic acid, sodium methallylsulfonate, N-vinylpyrrolidone, polyoxyethylene acrylate, an initiator, sodium hydroxide, a nano-modifier and distilled water. A preparation method of the temporary plugging agent comprises the following steps: adding distilled water into a reaction container, and introducing nitrogen to replace air; adding the unsaturated organic acid, sodium methallyl sulfonate and N-vinylpyrrolidone into the reaction container, stirring the added substances, adding 1 / 2 of the initiator, heating the obtained mixture to 100-110 DEG C, performing a reaction for 30 min, and adding sodium hydroxide; and heating the obtained reaction solution to 145-155 DEG C, performing a reaction for 1.0 h, adding the polyoxyethylene acrylate and the remaining initiator, heating the reaction solution to 175-185 DEG C, addingthe remaining initiator, performing a reaction for 2 h, adding the modifier, and drying the obtained reaction product to obtain the product. The temporary plugging agent has a good temporary blockingdiversion effect, has small damages to stratum after being degraded, passes compressive experiments, and has a compressive strength reaching 80 MPa or more.

The invention discloses silk fibroin hydrogel adopting an IPN (interpenetrating polymer network) structure and a preparation method of the silk fibroin hydrogel. N-vinylpyrrolidone monomers are subjected to a polymerization reaction under catalysis of horse radish peroxidase to produce polyvinylpyrrolidone, polyvinylpyrrolidone and silk fibroin macromolecules are subjected to molecular chain entanglement, and the IPN hydrogel with a random coil structure as a main structure is formed. According to the solid content of the hydrogel, the content of silk fibroin is 50%-90% by mass, and the content of polyvinylpyrrolidone is 10%-50% by mass. The compression strength reaches 2 kPa or above and the resiliency reaches 90%-100% when the compression ratio of the IPN silk fibroin hydrogel is 60%. The provided silk fibroin hydrogel has the characteristics of high strength, elasticity and transparency and can be used as a polymer material for cornea repairing.

Disclosed is a holographic recording medium and methods of manufacturing the holographic recording medium. The example of the medium has a recording layer containing a three dimensionally cross-linked polymer matrix including an epoxy resin, a radically polymerizable monomer, and a photo radical polymerization initiator. The radically polymerizable monomer comprises both N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP) or N-vinylcarbazole alone. The weight ratio of N-vinylcarbazole (VC) to the sum of N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP), i.e., (VC / (VC+VP)), is not smaller than 0.75 and not larger than 1.0.

The invention belongs to the field of three-dimensional printing materials, and discloses a three-dimensional printing photosensitive resin material containing macromelecular elastomers and a preparation method. The resin material is prepared by 1%-5% of mixed photoinitiators, 8%-18% of methacrylic acid borneol esters, 1%-7% of N-vinylpyrrolidone, 30%-50% of the macromelecular elastomers, 10%-25% of 1,4-cyclohexyl methanol divinyl ethers and 10%-30% of ethyoxyl bisphenol A di-acrylic ester. According to the resin material, the elastic macromolecular macromonomers which take isoprene as the first block and ethylene oxide as the second block and are provided with end groups and vinyl groups are formed by taking phenyllithium containing double bonds as the initiators through anionic polymerization; a new direction is brought for a photocuring forming technology through the molecular design and synthesis technique; the toughness of the three-dimensional printing photosensitive resin is further improved by adding the macromelecular elastomers.

The invention discloses a hydrate decomposition inhibitor suitable for natural gas hydrate formation drilling. The hydrate decomposition inhibitor is prepared from the following raw materials by masspercent: 0 to 100 percent of poly 3-methylene2-pyrrolidone, 0 to 100 percent of lecithin, and 0 to 100 percent of poly N-vinylpyrrolidone. When the hydrate decomposition inhibitor suitable for naturalgas hydrate formation drilling, provided by the invention is used for ocean or frozen earth natural gas hydrate drilling operation, the decomposition of the hydrate can be effectively inhibited, thestability of the natural gas hydrate formation can be improved, and a series of underground accidents caused by the decomposition of the hydrate can be avoided.

Compositions comprising macromers having a backbone comprising units having a 1,2-diol and / or 1,3-diol structure for tissue bulking and coating. Such polymers include poly(vinyl alcohol) (PVA) and hydrolyzed copolymers of vinyl acetate, for example, copolymers with vinyl chloride, N-vinylpyrrolidone, etc. The backbone polymer contains pendant chains bearing crosslinkable groups and, optionally, other modifiers. When crosslinked, the macromers form hydrogels having many properties advantageous for use as agents to hulk and coat tissues.

A method for manufacturing a microporous film comprising the steps of:(a) providing a first polymer which is a hydrophobic thermoplastic polymer and a second polymer which is a hydrophilic polymer or copolymer of N-vinylpyrrolidone;(b) dissolving said first and second polymers in a solvent system which is compatible with both polymers, said solvent system comprising a blend of an aprotic organic solvent and an alcohol;(c) coating the resulting solution on a support;(d) effecting at least a partial drying of the resulting coating; and(e) washing the coating in an aqueous medium so as to extract at least 50% by weight of the said second polymer.

The invention discloses a method for preparing a poly-N-vinylpyrrolidone-polyethylene glycol-poly-lactic acid copolymer shell layer cross-linked micelle. The process of the method comprises the following steps: polyethylene glycol monomethacrylate is firstly synthesized, and then the polyethylene glycol monomethacrylate-poly-lactic acid block copolymer which is provided with double bonds at the tail end of a PEG chain segment is prepared by the polymerization with lactide. Polyethylene glycol monomethacrylate-poly-lactic acid block copolymer micelle aqueous dispersion is prepared by the spontaneous emulsion-solvent method, then N-vinyl pyrrolidone is added in the presence of ammonium persulfate and tetramethylethylenediamine, thus obtaining the poly-N-vinylpyrrolidone-polyethylene glycol-poly-lactic acid copolymer shell layer cross-linked micelle. The method has the advantages that, the preparation process is simple; the prepared poly-N-vinylpyrrolidone-polyethylene glycol-poly-lactic acid copolymer shell layer cross-linked micelle has good stability and can be used as a drug release carrier with great drug loading and adjustable release rate.

The present invention discloses a cool feeling hydrogel, which is a peppermint oil and xylitol wrapped acrylamide / N-vinylpyrrolidone copolymer hydrogel. The hydrogel uses the peppermint oil and xylitol icy feeling combination to bring the human body super strong icy cool feeling, and the icy cool feeling effect had good durability. Meanwhile, a textile fabric prepared from the hydrogel is always in a point contact with human body to ensure that textiles may not be pasted on the skin due to increase of the amount of sweat, and the hydrogel is used, to be equivalent, the inner layer of the textile is additionally provided with boss holes, an air layer may be exist in the boss holes, when the textile inner space is large, stack effect is easy to produce, the body heat loss is greatly increased, the body temperature is reduced, textile ventilation and breathability perspiration properties can be improved, and the textile microclimate comfort property can be improved. The present invention also provides a preparation method of the cool feeling hydrogel, and a cool feeling fabric and a preparation method of the cool feeling fabric.

Fabric care compositions that include a graft copolymer, which may include (a) a polyalkylene oxide, such as polyethylene oxide (PEG); (b) N-vinylpyrrolidone (VP); and (c) a vinyl ester, such as vinyl acetate. Methods and uses relating to such compositions and / or graft copolymers.

Improved well cement additives, compositions and methods of using the compositions are provided. The well cement additives are basically comprised of a first monomer selected from the group of 2-acrylamido-2-methylpropane sulfonic acid, 2-allyloxy-2-hydroxy-1-propane sulfonic acid and vinylsulfonic acid, a second monomer selected from the group of N,N-dimethylacrylamide, acrylamide, N-vinylpyrrolidone, N-vinylacetamide and acrylonitrile and a third monomer selected from the group of C6 to C22 dimethylaminopropylmethacrylamide bromide, chloride and iodide and C6 to C22 dimethylaminoethylmethacrylate bromide, chloride and iodide.

A method for removing an organic solute from a solution comprises contacting the solution with a polymer formed by copolymerizing one or more hydrophobic monomers and one or more hydrophilic monomers, whereby the solute is adsorbed onto the polymer. The solution can comprise a polar solvent such as a polar organic solvent or water or an aqueous buffer. The hydrophobic monomer can be, for example, divinylbenzene. The hydrophilic monomer can be, for example, a heterocyclic monomer, such as a vinylpyridine or N-vinylpyrrolidone.

The invention relates to a micro-branched micro-cross-linked association polymer, a preparation method and applications thereof. The preparation method comprises: (1) carrying out initial mixing: mixing acrylamide, acrylic acid, 2-acrylamide-2-methyl propanesulfonic acid, a rigid monomer, a branched monomer, a hydrophobic monomer, a surfactant and a solvent, wherein the rigid monomer is any one ora variety of materials selected from N-vinylpyrrolidone, styrene and sodium p-styrenesulfonate, the branched monomer is ethylene dimethacrylate and / or 2-(dimethylamino)ethyl methacrylate, and the hydrophobic monomer is any one or a variety of materials selected from N,N-di-n-octyl acrylamide, N-dodecyl acrylamide and octadecyl dimethylallyl ammonium chloride; (2) adjusting the pH value by addingan alkali; (3) adding an auxiliary agent; and (4) polymerizing: adding an initiator to the mixed solution treated in the step (3), and initiating a polymerization reaction so as to obtain the micro-branched micro-cross-linked association polymer, wherein the obtained micro-branched micro-cross-linked association polymer has excellent temperature resistance and excellent salt resistance.

The invention includes a medical hydrogel made from polymerized polysaccharide macromers. The macromers are preferably polysaccharides decorated with polymerizable groups, for example, methacrylates. The macromers may also be made into polymers of at least two macromers polymerized together. These polymers are preferably multi-armed or high-molecular weight and used for medical uses, for example, making coatings on medical devices. Macromers of N-vinylpyrrolidone are also disclosed herein.