2117 results about "Polymethacrylic Acids" patented technology

The invention provides a controlled release bioactive agent delivery device that includes a body member having a direction of extension, a longitudinal axis along the direction of extension, and a proximal end and a distal end, wherein at least a portion of the body member deviates from the direction of extension, and a polymeric coated composition in contact with the body member, the polymeric coated composition including a first polymer, a second polymer, and a bioactive agent, wherein the first polymer comprises polyalkyl(meth)acrylate, aromatic poly(meth)acrylate, or a combination of polyalkyl(meth)acrylate and aromatic poly(meth)acrylate, and wherein the second polymer comprises poly(ethylene-co-vinyl acetate). The invention also provides methods of delivering a bioactive agent to a patient in a controlled release manner, as well as methods of making a controlled release bioactive agent delivery device.

A method of improving hydrocarbon recovery from oil sands, oil shale, and petroleum residues includes adding a polymeric or nonpolymeric processing aid capable of sequestering cations, such as the multivalent calcium, magnesium and iron cations. The hydrocarbons are preferably contacted with the processing aid before a primary separation of the hydrocarbons in order to increase bitumen recovery. A processing aid is provided in an effective amount to increase the liberation of the hydrocarbons from inorganic solids, particularly when the source is a poor processing ore. Preferred processing aids include citric acid or a polymeric acid selected from polyacrylic acid, polymethacrylic acid, salts of these acids, partial salts of these acids, and combinations thereof. The processing aids significantly increase the hydrocarbon recovery typically with concentrations less than 50 ppm and the polymeric processing aids can also provide beneficial flocculation of solids in tailings slurry.

A weather resistant coating composition comprising a miscible polymer blend of highly crystalline polyvinylidene fluoride polymer and polyalkyl methacrylate, such as PVDF and PMMA. The miscible blend comprises from about 50 weight percent to about 90 weight percent polymer comprising polyvinylidene fluoride and from about 10 weight percent to about 50 weight percent polyalkyl methacrylate. The polyalkyl methacrylate having a molecular weight within the range of about 25,000 grams per mole to about 200,000 grams per mole. The crystallinity of the polyvinylidene fluoride polymer is about 20% to about 70%. The weather resistant coating has excellent and unexpected physical characteristics, including solvent resistance and gloss retention.

Blends of amorphous and semicrystalline polymers having shape memory properties were prepared by blending a crystalline polymer such as poly(vinylidene fluoride), polylactide, poly(hydroxxybutyrate), poly(ethylene glycol) polyethylene, polyethylene-co-vinyl acetate, poly(vinyl chloride), poly(vinylidene chloride) and copolymers of poly(vinylidene chloride) and poly(vinyle chloride) and an amorphous polymer such as poly(vinyl acetate), poly methyl acrylate, poly ethyl acrylate, atactic poly methyl methacrylate, isotactic poly methyl methacrylate, syndiotactic poly methyl methacrylate and other poly alkyl methacrylates. The method for preparing the polymeric materials and applications thereof, for example, as smart medical devices, are also disclosed.

A coating composition in the form of a one or multi-part system, and method of applying such a composition under conditions of controlled humidity, for use in coating device surfaces to control and/or improve their ability to release bioactive agents in aqueous systems. The coating composition is particularly adapted for use with medical devices that undergo significant flexion and/or expansion in the course of their delivery and/or use, such as stents and catheters. The composition includes the bioactive agent in combination with a first polymer component such as polyalkyl(meth)acrylate, polyaryl(meth)acrylate, polyaralkyl(meth)acrylate, or polyaryloxyalkyl(meth)acrylate and a second polymer component such as poly(ethylene-co-vinyl acetate).

A coated coronary stent, comprising: a stainless steel sent framework coated with a primer layer of Parylene C; and a rapamycin-polymer coating having substantially uniform thickness disposed on the stent framework, wherein the rapamycin-polymer coating comprises polybutyl methacrylate (PBMA), polyethylene-co-vinyl acetate (PEVA) and rapamycin, wherein substantially all of the rapamycin in the coating is in amorphous form and substantially uniformly dispersed within the rapamycin-polymer coating.

The invention provides a preparation method of a monodisperse porous polymer microsphere. After a second stage of swelling of two-stage seed swelling polymerization, remnant monomer separation technology is adopted to avoid the aggregation of the microspheres and the generation of secondary particles, thereby greatly improving the stability of preparing monodisperse porous polymer microsphere through the two-stage seed swelling polymerization. The two-stage seed swelling polymerization can stably prepare the following monodisperse porous polymer microspheres: P(St-co-DVB) (PSD for short) and P(St-co-DVB-co-MMA) (PSDA for short), wherein, St is referred to as styrene, DVB as divinybenzene, MMA as methyl methacrylate, AN as acrylonitrile and co as copolymerization. The monodisperse porous polymer microsphere PSDA prepared by the method can be seen in an attached drawing.

A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in increased viscosity of the fluid.

The invention relates to a hydrous, paste-like cleaning or detergent composition comprising an emulsion having an aqueous phase and an oil phase, the composition comprises based on the whole concentrate 1 to 50 wt-% of one or more alkalinity source, 1 to 60 wt-% of a guerbet alcohol ethoxylate of the formula R₁—(OC₂H₄)_n—OH, wherein R₁ is a branched C₉ to C₂₀ alkyl group and n is from 2 to 10, 1 to 30 wt-% of a linear alkoxylated fatty alcohol of the formula R₂—(OC₂H₄)_x—(OC₃H₆)_y—OH, wherein R₂ is a linear C₁₀ to C₁₆ group and n is from 3 to 7 and m is from 3 to 7, 0.01-10 wt-% of one or more crosslinked or partly crosslinked polyacrylic acid or polymethacrylic acid or mixtures thereof, 1-10 wt-% of a thickener system comprising the following components: 1-5 wt-% of a polyacrylate, 0-5 wt-% of a swellable phyllosilicate, 0-2 wt-% of a polyethylene glycol with the provision that the thickener system comprises at least two of these components, and the rest up to 100 wt-% is water.

The invention provides an engineering plastic with high wearing resistance. The engineering plastic is made from the following raw materials by weight: 80-100 parts of polyformaldehyde, 20-40 parts of polyamide, 20-50 parts of polycarbonate, 25-40 parts of acrylonitrile-butadiene-styrene copolymer, 10-30 parts of epoxy resin, 12-20 parts of polytrimethylene terephthalate, 1-5 parts of diphenylmethane bismaleimide, 10-15 parts of polyphenyl ether, 20-40 parts of polyether-ether-ketone, 10-20 parts of polytetrafluoroethylene, 5-10 parts of melamine, 4-12 parts of boric acid alkanolamide, 2-6 parts of polyethylene glycol, 4-12 parts of phenolic ether phosphomonoester, 5-15 parts of polymethyl methacrylate, 10-20 parts of organic silicone oil, 5-10 parts of silane coupling agent, 3-5 parts of zinc stearate, 10-20 parts of glass fibre, 12-20 parts of graphite, 5-10 parts of silicon carbide whisker, 5-8 parts of nanometre titanium oxide, 4-6 parts of diphenyl ketone, 3-8 parts of butylated hydroxyanisole and 15-30 parts of filler. The engineering plastic provided by the invention has a good wear-resisting property.

The invention relates to a preparation method and application of an environment-friendly lithium ion battery, and in particular relates to a simulated mussel protein environment-friendly lithium ion battery adhesive. By simulating the molecular structure and action mechanism of mussel protein, histidine and dopamine are connected to polyacrylic acid, polymaleic acid, sodium alginate, sodium carboxymethylcellulose, carboxymethyl chitin, carboxymethyl chitosan, abietic acid and other natural or synthesized polymer to prepare a series of aqueous adhesives. The adhesive has a good adhering effect for various cathode materials such as carbon black, graphite and silicon. By adopting the adhesive provided by the invention, various properties of a lithium ion battery can be obviously improved, and especially cycle property of a silicon cathode material in a battery can be obviously improved.

The invention relates to a heat-resistant scratch-resistant high-transmittance PMMA alloy resin composition. The composition is prepared from the following raw materials in parts by weight: 10-94 parts of polymethyl methacrylate, 5-70 parts of special heat-retardant agent for PMMA, 1-45 parts of a flexibilizer, 0-80 parts of a fluidity regulator, 0.1-1 part of an antioxidant, 0.1-2 parts of a lubricating agent and 0.001-1.0 part of an additive, wherein the special heat-retardant agent for PMMA refers to a maleic anhydride-styrene-methyl acrylate terpolymer MAH-St-MMA. The maleic anhydride-styrene-methyl acrylate terpolymer, polymethyl methacrylate and fluidity regulator used in the invention have good compatibility, and high transparency is achieved after blending; and moreover, the flexibilizer with refractive index consistent with that of a blended matrix resin is selected, and by virtue of the conventional double screw molding, the prepared alloy resin has the advantages of high transmittance, scratch resistance and heat resistance.

The invention relates to a silicon-acrylic three-block copolymer with low surface energy and a process for preparation, which relates to the synthesis of silicon-acrylic low-surface-energy three-block copolymer. The invention provides a silicon-acrylic three-block copolymer with low surface energy, whose structure of reaction product is accurate, and the original skeleton construction of each block is kept. The invention relates to a dimethyl silicone polymer-b- polymethyl methacryate-b-poly n-butyl methacrylate. And the process for preparation comprises first, preparing dimethyl silicone polymer macromolecule initiating agent of the dead ends of bromine atoms, second, preparing two-block macromolecule initiating agent of copolymer dimethyl silicone polymer-b-polymethyl methacryate, third, preparing two-block copolymer macromolecule initiating agent of dimethyl silicone polymer-b- polymethyl methacryate, finally, preparing three-block novel copolymer of dimethyl silicone polymer-b- polymethyl methacryate-b-poly n-butyl methacrylate.

The invention relates to a fluorine-contained film and a preparation method thereof. The fluorine-contained film is prepared from the following raw materials in parts by weight: 50-90 polyvinylidene fluoride polymer, 10-40 polymethacrylic acid resin and 0.5-10 additives. The fluorine-contained film prepared by the technical scheme provided by the invention has ideal mechanical performance and weatherability and excellent optical performance, wherein the ideal mechanical performance refers to longitudinal tensile strength larger than 130MPa, longitudinal at-break elongation larger than 95 percent, longitudinal tensile modulus larger than 2000MPa, transversal tensile strength larger than 150MPa, transversal at-break elongation larger than 80 percent and transversal tensile modulus larger than 2000MPa.

The invention relates to a super hydrophobic silicon-fluorine polymer/nanometer silica hybridization nanometer material and a preparation method thereof, relating to a super hydrophobic nanometer material and a preparation method thereof. The invention provides the super hydrophobic silicon-fluorine polymer/nanometer silica hybridization nanometer material with mild reaction condition, definite reaction product structure as well as simple and convenient operation and the preparation method thereof. The preparation method comprises the following steps of: firstly, preparing nanometer silica modified by a silane coupling agent; secondly, preparing a nanometer silica atom transfer radical surface initiator; thirdly, preparing a SiO2-poly-Methacryloxypropyltrimethoxysilane macromolecule initiator; and finally preparing the silicon-fluorine polymer/nanometer silica hybridization nanometer material. The silicon-fluorine polymer/nanometer silica hybridization nanometer material has excellent high temperature resistance, ultraviolet resistance, infrared radiation resistance, oxidative degradation resistance, chemicals resistance and contamination resistance. Polymethyl 2-propenoic acid, 2,2,3,3,4,4,4-heptafluorobutyl ester has very low surface energy and very good hydrophobicity, wherein the surface energy can be as low as 0.5-1.5mN/m, and the hydrophobic angle can be over 150 degrees.

The invention discloses a pour point depressant for diesel oil, wherein polymethylacrylic acid higher ester is used as a host agent, and an arene compound, span, twain and a polar nitrogen-containing compound are used as an assistant. The substances are uniformly mixed and used for effectively reducing the cold filter plugging point of all diesel oils, and are especially better in perceptibility to diesel oils with high wax content and narrow fraction. In low temperature condition, the flowing property of diesel oils with high wax content and narrow fraction is better increased. The pour point depressant is simple to prepare, low in cost and remarkable in effect, has excellent market value, and can be used for solving the problem that the pour point depressant for diesel oil in the petrochemical industry in China is strong in pertinence, single in function and poor in broad spectrum.

A capacitor includes a plurality of electrode substrates, with each of the plurality of electrode substrates having a coated portion and an uncoated portion. The coated portion is coated with a coating material that includes a high surface area activated carbon material, a water soluble binder selected from the group consisting of: poly vinyl alcohol, poly acrylic acid, polymethacrylic acid, polyethylene oxide, polyacrylamide, poly-N-isopropylearylamide, poly-N,N-dimethylacrylamide, polyethyleneimine, polyoxyethylene, polyvinylsulfonic acid, poly (2-methoxyethoxyethoxyethylene), butadiene-acrylonitrile, and combinations thereof, and a water soluble thickener. A separator is inserted between adjacent substrates of the plurality of electrode substrates. The capacitor further includes an electrolyte. A method of manufacturing the capacitor is also provided.

The invention relates to an aqueous nickel welding paste for stainless steel brazing, which has the characteristics that: the welding paste is formed by 90-96 percent of brazing filler metal and 4-10percent of paste binders by weight percentage; the brazing filler metal comprises 4-18 percent o f Cr, 0.2-4 percent of Fe, 0.01-0.1 percent of C, 0.1-5 percent of Si, 5-10 percent of P and remainingamount is Ni. The paste binder is formed by the following constituents by weight percentage: 28-58 percent of mixture of carboxymethylcellulose with 10000-1000000 molecular weight and methylcellulose,40-70 percent of aqueous solvent and 1-10 percent of lubricants; or the paste binder is formed by 25-55 percent of one or a plurality of polyacrylamide with 1000-10000 molecular weight, polyacrylic acid, polymethylacrylic acid and copolymer, polyvinyl alcohol or polyoxyethylene, 40-70 percent of aqueous solvent and 1-10 percent of lubricants. The welding paste is the aqueous nickel welding pastewhich is convenient for automatic feeding, is easy to clear and has consistent color of a welding line and stainless steel; therefore, the aqueous nickel welding paste is suitable for stainless steelbrazing.

The invention discloses a preparation method of fluorescent complex microgel which is sensitive to temperature and pH. The method comprises the technical steps of preparing a mixed surface active agent, preparing the oil phase of a template, preparing an emulsive liquid, preparing a water phase, preparing N-isopropyl acryl amide copolymerized methacrylic acid microgel, preparing turgid N-isopropyl acryl amide copolymerized methacrylic acid microgel, preparing a mixed liquid of Gamma-aminopropyl triethoxy silane and normal heptane, preparing a silicon dioxide polymer complex microballoon decorated by a surface deposited amino group, preparing a mixed liquid of fluorescein isothiocyanate and absolute ethyl alcohol as well as preparing the fluorescent complex microgel. In the invention, the fluorescein isothiocyanate with high quantum yield and good optical stability is adopted as fluorescent matter; the prepared fluorescent complex microgel is sensitive to temperature and pH; and the size of the prepared fluorescent complex microgel is in a micron range and is hard to be aggregated. The method has the advantages of reasonable design, practical technique and easy operation; moreover, reactions are carried out under normal temperature and the like; the method can be applied to the fields of controlled release of medicament, biological probe, chemical separation, and the like.

The invention discloses a transparent and toughened polymethyl methacrylate (PMMA) material and a preparation method thereof. The transparent and toughened PMMA material comprises the following components in percentage by weight: 70 to 80 percent of polymethylmethacrylate, 20 to 30 percent of toughening agent, 0.5 to 1 percent of lubricant and 0.2 to 0.6 percent of antioxidant. The transparent and toughened PMMA material of the invention has high transparency, high toughness and high liquidity and further expands the application field of PMMA materials.

The invention discloses a nano SiO2 composite material thickened oil viscosity reducer and a preparation method thereof, which belongs to the technical field of nano SiO2 composite material preparation and application thereof. The viscosity reducer is nano (polymethacrylate higher alcohol-acrylamide)/SiO2 composite material. The preparation method comprises the following steps: 1)pre-modifying the surface of the nano SiO2 by a silane coupling agent; and 2)performing graft copolymerization of (methyl)acrylate higher alcohol and acrylamide on the surface of nano SiO2 to obtain the (polymethacrylate higher alcohol-acrylamide)/SiO2 composite material powder. The nano viscosity reducer has the advantages of good viscosity reducing effect, low cost, simple production and no pollution during a cleaning process. Through the experiment, the viscosity reducing rate of the nano viscosity reducer to the high wax thickened oil at Daqing dandong station is 72.10% at 40 DEG C.

A chemical mechanical polishing slurry includes at least one water-soluble polymer selected from a group consisting of polyacrylic acid, polymethacrylic acid and a salt thereof each having a weight-average molecular weight of 1,000,000 to 10,000,000, β-cyclodextrin, colloidal silica, and water.