214 results about "Ethyl vinyl ether" patented technology

An improved elastomeric material is described comprising an essentially noncross-linkable amorphous copolymer of tetrafluoroethylene (TFE) and perfluoromethyl vinyl ether (PMVE) which is both a thermoplastic and exhibits exceptional mechanical properties. This material is particularly suitable for use in ultra-clean environments, and particularly for use in an implantable device, since it does not contain contaminants that previous thermoset TFE / PMVE copolymers have required. Among the improved properties of the present invention are excellent biocompatibility, high matrix tensile strength, high clarity, high abrasion resistance, high purity, adequate elasticity, and ease of processing due to the thermoplastic, and noncross-linkable structure of the copolymer. The material of the present invention is also a high strength bonding agent particularly suited for bonding porous PTFE to itself or to other porous substances at room or elevated temperatures.

To provide a novel ABA-type triblock copolymer of vinyl ether series, comprising polyvinyl ether and an oxystyrene-series unit, and a process of producing the ABA-type copolymer at a series of steps. The invention relates to a novel ABA-type triblock copolymer comprising Segment A comprising an oxystyrene-series repeat unit (a) and Segment B comprising a vinyl ether-series repeat unit (b), in which the Segment A and the Segment B are bonded together with a single bond, and to a simple process of producing the same. The triblock copolymer can be produced at a series of steps in a simple manner, comprising living cationic polymerization of a vinyl ether-series monomer such as ethyl vinyl ether in the presence of a bifunctional initiator and a Lewis acid, and subsequently adding an oxystyrene-series monomer such as p-hydroxystyrene for living cationic polymerization.

The composition for stimulating an immune response in a subject comprises methyl vinyl ether and maleic anhydride copolymer-based nanoparticles. Said nanoparticles may further contain an allergen or an antigen and / or an immunostimulating agent, which may be contained inside said nanoparticles and / or at least partially coating the surface of said nanoparticles, and optionally a cross-linking agent. The immune response stimulating composition is useful as an adjuvant in immunotherapy and vaccines.

Oral care composition for preventing and / or reducing calories, including: at least about 0.005%, of metal ions wherein the composition comprises at least about 0.005% of zinc ions and optionally comprises from about 0.001% to about 3%, of stannous ions; at least about 100 ppm of fluoride ions; from about 0.03% to about 10% of a mineral surface active agent selected from homopolymers of itaconic acid, homopolymers of acrylic acid, copolymers of maleic acid and acrylic acid, copolymers of maleic anhydride or acid with methyl vinyl ether, and mixtures thereof; at least 5% of water; less than 10% fused silica, calcium based abrasives, and mixtures thereof; less than 5% of polyphosphates having n+3 or higher; and wherein the weight ratio of metal ion to the mineral surface active agent is equal to or less than about 0.5.

The present invention relates to a composition of tetrafluoroethylene / perfluoro(ethyl vinyl ether) copolymer particles and metal powder which enables the composition to the used for rotolining an interior surface of a hollow article, wherein the resultant lining adheres to such surface. The invention further relates to oil pipe having its interior surface rotolined with fluoropolymer, the rotolining containing an effective amount of metal powder to cause the rotolining to adhere to said interior surface and a process for rotolinig the interior of the oil pipe.

Oral care compositions having improved efficacy for preventing and / or reducing caries, containing: from about 0.001% to about 5%, of metal ions wherein the composition comprises at least about 0.001%, of stannous ions and optionally comprises from about 0.001% to about 4%, of zinc ions; at least about 100 ppm, by weight of the composition, of fluoride ions; at least about 0.03%, by weight of the composition, of a mineral surface active agent selected from homopolymers of itaconic acid, homopolymers of acrylic acid, copolymers of maleic acid and acrylic acid, copolymers of maleic anhydride or acid with methyl vinyl ether, and mixtures thereof; at least 5%, of water; less than 10%, by weight of the composition, of fused silica, calcium based abrasives, and mixtures thereof; less than 5%, of polyphosphates having n+3 or higher; wherein the weight ratio of total metal ion to the mineral surface active agent is equal to or less than 0.5.

The present invention includes an anti-sweat lotion specifically designed for use by people suffering from hyperhidroses. In a preferred embodiment, the lotion of the present invention is a composition of the follow ingredients:a. denatured ethyl alcohol;b. hydrophobic silica;c. a monoethyl ester of the copolymer of methyl vinyl ether and maleic anhydride;d. iso-octahexacontane;e. octamethylcyclotetrasiloxane; and,f. hydroxypropylcelluose.In another preferred embodiment, the octamethylcyclotetrasiloxane is replaced by decamethylcyclopentasiloxane.

Nano-porous low dielectric constant films are deposited utilizing materials having reactive by-products readily removed from a processing chamber by plasma cleaning. In accordance with one embodiment, an oxidizable silicon containing compound is reacted with an oxidizable non-silicon component having thermally labile groups, in a reactive oxygen ambient and in the presence of a plasma. The deposited silicon oxide film is annealed to form dispersed microscopic voids or pores that remain in the nano-porous silicon. Oxidizable non-silicon components with thermally labile groups that leave by-products readily removed from the chamber, include but are not limited to, limonene, carene, cymene, fenchone, vinyl acetate, methyl methacrylate, ethyl vinyl ether, tetrahydrofuran, furan, 2,5 Norbornadiene, cyclopentene, cyclopentene oxide, methyl cyclopentene, 2-cyclopentene-1-one, and 1-butene.

Fluorinated copolymers are prepared via copolycondensation polymerization in a process comprising reacting A) a telechelic fluoroazido compound of formula N3(Y)p—(CH2)n—R—(CH2)m—(Y)pN3, wherein Y is SO, SO2, C6H4, or CO, p=0 or 1, n and m are independently 1 to 4, and R is selected from the group consisting of i) a C3-C10 fluoroalkylene group, ii) a C3-C10 fluoroalkoxylene group, iii) a substituted aryl group, iv) an oligomer comprising copolymerized units of vinylidene fluoride and perfluoro(methyl vinyl ether), v) an oligomer comprising copolymerized units of vinylidene fluoride and hexafluoropropylene, vi) an oligomer comprising copolymerized units of tetrafluoroethylene and perfluoro(methyl vinyl ether), and vii) an oligomer comprising copolymerized units of tetrafluoroethylene and a hydrocarbon olefin with B) a telechelic diyne or dinitrile compound in the presence of copper halide catalyst.

A composite molded body, and its manufacturing method, is provided wherein the composite body contains a layer comprising a copolymer of tetrafluoroethylene (TFE) and perfluoro(ethyl vinyl ether) (PEVE). The composite body can be manufactured under conditions in which an adjoined layer of thermoplastic resin and / or thermosetting resin is not be melted, thermally degraded or decomposed. The copolymer has a PEVE content of 20 to 80 weight percent, based on the total weight of the copolymer, and a melt flow rate of from 0.1 to 100 g / 10 min, as measured in compliance with ASTM D1238 at a temperature of 250° C.±0.1 using a 5 kg weight.

A liquid-absorbent composition, which has a liquid-absorbent crosslinked resin that exhibits excellent absorption of the nonaqueous electrolyte of nonaqueous electrolyte secondary cells that constitute a nonaqueous electrolyte battery pack (and particularly a lithium ion nonaqueous electrolyte rechargeable battery pack), contains a powder of a liquid-absorbent crosslinked resin produced by crosslinking a methyl vinyl ether / maleic anhydride copolymer with a polyfunctional isocyanate compound, and a binder resin. Also, a liquid-absorbent sheet for a nonaqueous electrolyte battery pack contains supporting substrate and formed on one side of a supporting substrate a liquid-absorbent crosslinked resin layer, produced by crosslinking a methyl vinyl ether / maleic anhydride copolymer with a polyfunctional isocyanate compound. The nonaqueous electrolyte battery pack contains a battery case and disposed within the battery pack a nonaqueous electrolyte battery cell, a wiring circuit board, and an electrolyte absorption member formed from the liquid-absorbent sheet for absorbing electrolyte in the event that electrolyte leaks from the nonaqueous electrolyte battery cell.

A storable, hydraulically-active, cementitious slurry is made and used to cement within subterranean foundations for oil and gas wells. The slurry is made from a hydraulically-active cementitious material, a suspending agent, and, as a retarder, boric acid. The boric acid is present in the cementitious slurry in an amount sufficient to lower the pH of the storable cementitious slurry to at least 12.0, preferably to at least 11.0 or preferably, for reasons of longevity, to a pH of at least 9.0. Generally the amount of boric acid in the cementitious slurry is between from about 1 to about 6 percent by weight. Preferred as suspending agent are iota carrageenan as well as poly (methyl vinyl ether / maleic anhydride) decadiene copolymer. The slurry remains liquid during storage. The slurry is activated when needed for cementing and is pumped into the subterranean formation where it is allowed to set.

The invention relates to a preparation method of photoresponsive intelligent gel microspheres for three-dimensional cell culture. The preparation method is characterized by comprising the following steps: dissolving poly(methyl vinyl ether-maleic anhydride) and beta-cyclodextrin into a solvent, namely N,N-dimethylformamide, carrying out heating reaction under the protection of nitrogen, and removing the solvent; adding a mixture water solution of polyethylene glycol 20000 and agarose into the reactant, and vibrating until the reactant is dissolved, so as to prepare a water-phase solution for later use; dropwise adding the water-phase solution into oil-phase simethicone, carrying out heating, stirring, reaction and standing, removing supernate, cleaning microspheres deposited at the bottom of a container, and carrying out vacuum drying, so as to obtain the gel microspheres; putting the gel microspheres into Azo-RGD methane water solution, vibrating for 24 hours under the room temperature, repeatedly rinsing by virtue of deionized water, and drying by virtue of N2. By utilizing the gel microspheres prepared by virtue of the preparation method, growing environments of cells in vivo can be simulated, and the adsorption and controllable separation of the cells on the microspheres can be realized.

The invention provides a aqueous slurry useful for chemical mechanical polishing a semiconductor substrate having copper interconnects. The slurry comprises by weight percent, 0 to 25 oxidizing agent, 0.1 to 50 abrasive particles, 0.001 to 10 inhibitor for decreasing static etch of the copper interconnects, 0.001 to 5 poly(methyl vinyl ether) having a formula as follows:and the poly(methyl vinyl ether) is water soluble and n has a value of at least 5, 0.005 to 1 aminobutyric acid, 0.01 to 5 phosphorus-containing compound, 0 to 10 copper complexing agent formed during polishing and balance water.

The present invention relates to a synthesizing method for 3-methoxy-3-ethoxy methyl propionate, and belongs to the field of chemistry. The synthesizing step comprises the following steps: introducing methyl vinyl ether into trichloroacetyl chloride, and insulating until a reaction is completed; combining BJ01 with anhydrous methanol, adding an acid-binding agent I, and insulating until a reaction is completed; and mixing BJ02 with an organic solvent 2, adding a catalyst, and insulating until a reaction is completed to obtain the 3-methoxyacrylate. The synthesizing method for the 3-methoxyacrylate has the advantages of few reaction steps, easiness in operation, less waste gas, waste water and waste residues, high yield, high purity of products, and inexpensive and easily available raw materials. All the steps have no harsh conditions and are simple in operation and environmentally-friendly, and the solvent are easily recycled and reused, so that the synthesizing method is suitable for industrial production.

The invention relates to a method for producing propylene glycol mono-methyl ether with energy conservation, which comprises the following steps: mixing propylene epoxide, methanol and a catalyst (sodium methoxide or potassium methoxide) in a preset ratio in a static mixer; preheating to a set temperature with vapor generated by absorbing reaction heat in a preheater; heating with foreign vapor with the temperature higher than 160DEG C in a heater for pre-reaction; continuously reacting materials in a tube pass of a pressureproof tube type heat exchanger; vaporizing hot water in a shell pass with surplus heat released in the reaction; and performing the subsequent routine refining process of separation and purification on materials on the outlet of the tube pass of the tube type heat exchanger to produce the propylene glycol mono-methyl ether. The method can timely remove heat released in etherification, the heat is converted to a heat source for preheating the raw materials, and the method can produce the propylene glycol mono-methyl ether with energy conservation. The heat exchange makes the temperature rise in the reaction controlled in a narrow range, so the selectivity of generated 1-methoxy-2-propanol can be improved and the quality of the product is improved.

The invention provides a aqueous slurry useful for chemical mechanical polishing a semiconductor substrate having copper interconnects. The slurry comprises by weight percent, 0 to 25 oxidizing agent, 0.1 to 50 abrasive particles, 0.001 to 10 inhibitor for decreasing static etch of the copper interconnects, 0.001 to 5 poly(methyl vinyl ether) having a formula as follows: and the poly(methyl vinyl ether) is water soluble and n has a value of at least 5, 0.005 to 1 aminobutyric acid, 0.01 to 5 phosphorus-containing compound, 0 to 10 copper complexing agent formed during polishing and balance water.

The combination of a hinge and an insulated wire is provided, wherein the hinge is capable of closing and opening to an angle of at least 90°, the insulated wire being secured by the hinge so as to fold when said hinge is closed and to unfold when said hinge is opened, the insulation on the wire comprising fluoropolymer, such as tetrafluoroethylene / -hexafluoropropylene copolymer or tetrafluoroethylene / perfluoro(methyl vinyl ether) / perfluoro(propyl vinyl ether) copolymer, each polymer having a melting point of 260 to 290° C. and MIT Flex Life of at least about 15,000 cycles, the hinge being useful in such electronic devices as a laptop computer or a clamshell cell phone, attaching the keyboard and screen portion to one another, the insulation being capable of repeated opening and closing of the hinge without cracking of the insulation.

The invention relates to a polyurethane material which is obtained by comprehensively utilizing a method combining semi-continuous living cationic polymerization and 'click' chemistry technology and has adjustable surface hydrophilicity, concretely speaking, poly(vinyl methyl ether) or methyl vinyl ether and a copolymer of other monomers are grafted on the surface of the polyurethane material to obtain the surface functionalized polyurethane material. The invention aims to provide a simple and practicable method to modify the surface of polyurethane so as to obtain the required surface with controllable hydrophilicity. By the method, the functional polyurethane material with adjustable surface hydrophilicity and excellent mechanical property can be obtained, and the problem of combining PMVE and polyurethane can be solved, thus forming the novel functional polyurethane material which is simple in technology, economical and practical.

The invention discloses a preparation method of a hydrogel for the three-dimensional culture of tumor cells. A methyl vinyl ether / maleic acid copolymer which is a polymethyl vinyl ether / maleic anhydride hydrolysate is cross-linked by a cross-linking agent which is polyethylene glycol, a poly(lactide-co-glycolide)-polyethylene glycol-poly(lactide-co-glycolide) triblock copolymer, a poly-epsilon-caprolactone lactide-polyethylene glycol-poly-epsilon-caprolactone lactide triblock copolymer or glucan; the proportion of a carboxyl group in the methyl vinyl ether / maleic acid copolymer and the proportion of a hydroxy group in the cross-linking agent are adjusted to obtain a gel of different cross-linking densities, superfluous carboxyl groups in the gel after the cross-linking are esterified by polyethylene glycol monomethyl ether; the obtained gel is processed to prepare a 5% aqueous solution; and the aqueous solution is neutralized with a weak alkali such as a saturated aqueous solution of sodium bicarbonate to the pH value of 7.0 in order to prepare the hydrogel which can be used as a tumor cell three-dimensional culture medium.

The invention discloses a preparation method of a polyelectrolyte-cladding LiNixCoyMn<1-x-y>O2 positive electrode material. The method is characterized in that the cladding treatment is carried out by cutting the polyelectrolyte solution at high speed, then the polyelectrolyte solution is dried to obtain the polyelectrolyte-cladding LiNixCoyMn<1-x-y>O2 positive electrode material, and the polyelectrolyte is one or a mixture of more of lithium polyacrylate, lithium polymethacrylate, lithium polymaleic anhydride, poly (methyl vinyl ether copolymer maleic acid) lithium or lithium polyfumarate. The cladding method is characterized in that a layer of polyelectrolyte membrane is formed on the surface of the LiNixCoyMn<1-x-y>O2, so that the compatibility between the LiNixCoyMn<1-x-y>O2 and the electrolyte is improved, and the LiNixCoyMn<1-x-y>O2 has the characteristics of high specific capacity, high multiplying powder and long service life.

The invention relates to a synthetic method of perfluoroether rubber with a wide temperature range. Main improvement points are as follows: tetrafluoroethylene and perfluoromethoxy ethyl vinyl ether are used as comonomers; the perfluoroether rubber is prepared through an emulsion polymerization method, and one or more of perfluoro-4-bromo-1-butene, perfluorobromoethyl vinyl ether, perfluoroiodoethyl vinyl ether, perfluoro-4-iodo-1-butene, trifluoroiodoethylene or trifluorobromoethylene is added as vulcanization point monomers in the polymerization reaction process; and I(CF2)nI is selected asa chain transfer agent. The perfluoromethoxy ethyl vinyl ether is selected as the monomer of the polymerization reaction, so that the temperature range of the perfluoropolyether obtained by polymerization can be effectively widened, the lowest temperature range can reach -35 DEG C, and the perfluoromethoxy ethyl vinyl ether can be used for a long time at the high temperature of 250 DEG C and has high and low temperature resistance.

A positive resist composition contains a novolak resin in which 3-27 mol % of the hydroxyl group hydrogens are substituted with 1,2-naphthoquinonediazidosulfonyl ester groups, a methyl vinyl ether-monoalkyl maleate copolymer and optionally, an alkali-soluble cellulose whose glucose ring substituent groups are substituted with organic groups at a specific rate. The composition is useful as a thick film photoresist which is subject to a plating step and offers many advantages including high sensitivity, perpendicular geometry, high resolution, and crack resistance during and after the plating step.

The present invention aims to provide a modified polytetrafluoroethylene fine powder capable of providing a stretched body having high strength, a small pore size, and excellent homogeneity. The modified polytetrafluoroethylene fine powder of the present invention has non-melt-processability, has a standard specific gravity of 2.155 or lower, includes 0.015 mol % or more of a polymer unit derived from perfluoro(methyl vinyl ether) in all the monomer units, is obtained by emulsion polymerizing tetrafluoroethylene and at least the perfluoro(methyl vinyl ether) in the presence of a fluorosurfactant having a LogPOW value of 3.4 or lower, and has an extrusion pressure of 20.0 MPa or lower.

Disclosed herein is a crosslinked fluoropolymer network formed by the free radical initiated crosslinking of a diacrylate fluoropolymer The diacrylate copolymer is of formula CH2═CR′COO—(CH2)n—R—(CH2)n—OOCR′═CH2, wherein R is selected from the group consisting of i) an oligomer comprising copolymerized units of vinylidene fluoride and perfluoro(methyl vinyl ether), ii) an oligomer comprising copolymerized units of vinylidene fluoride and hexafluoropropylene, iii) an oligomer comprising copolymerized units of tetrafluoroethylene and perfluoro(methyl vinyl ether), and iv) an oligomer comprising copolymerized units of tetrafluoroethylene and a hydrocarbon olefin, R′ is H or —CH3, n is 1-4 and wherein said oligomer has a number average molecular weight of 1000 to 25,000 daltons. The source of the free radicals may be a photoinitiator or an organic peroxide.

A perfluoroelastomer composition comprises a perfluoroelastomer (e.g., tetrafluoroethylene / perfluoro(methyl vinyl ether) copolymer), an organic peroxide (e.g., 2,5-dimethyl-2,5(tert-butylperoxy)hexane and a scorch retarder (e.g., o-phenylphenol), and the perfluoroelastomer composition is excellent in processability and unlikely to scorch. Furthermore, a perfluoro rubber molded article obtained by thermal crosslinking of the perfluoroelastomer composition is excellent in rubber physical properties such as tensile strength and elongation at break and in a compression set property.

The present invention discloses a preparation method for 3,3,3-trifluoropropenyl methyl ether (CF3CH=CHOCH3). In the prior art, the reaction yield is low, the raw materials are difficult to be obtained, the cost is high. A purpose of the present invention is to solve the problems in the prior art. With the present invention, 1,2-dibromo-3,3,3-trifluoropropane is adopted as a raw material; the preparation method comprises the following steps: during stirring, adding methanol, an alkali to a reactor, then adding 1,2-dibromo-3,3,3-trifluoropropane, heating to a temperature of 70 DEG C, carrying out the reaction for 6 hours, wherein a mole ratio of the 1,2-dibromo-3,3,3-trifluoropropane to the methanol to the alkali is 1:3-8:2.4-6. The preparation method provided by the present invention is mainly applicable for preparing the 3,3,3-trifluoropropenyl methyl ether.

The invention discloses a method for preparing full-fluoride methyl vinyl ether by using a fluidized bed. The method comprises the following steps: firstly, enabling solid alkali carbonate and full-fluoride-2-methoxy propionyl fluoride to contact and react so as to obtain a full-fluoride-2-methoxy propionyl alkali metal salt, and further enabling the full-fluoride-2-methoxy propionyl alkali metalsalt to crack at 180-250 DEG C, thereby obtaining full-fluoride methyl vinyl ether. With the method disclosed by the invention, the yield and purity of full-fluoride methyl vinyl ether are high, the cost is low and industrial production is facilitated.