1572 results about "Copolymer composition" patented technology

A polymerization process for producing a tetrafluoroethylene copolymer, and the copolymer produced thereby, are provided. The copolymer is of the dispersion / fine powder type and contains polymerized tetrafluoroethylene monomer units and co-polymerized higher homologous comonomer units having the formula (CnF(2n+1))CH═CH2, wherein 6≦n<10, in which the primary particles are believed to have a core and shell structure and the polymerized comonomer units are present in an amount from 0.01 mol % to 0.3 mol %, based upon total copolymer composition. The copolymer has a raw dispersion primary particle size (RDPS) of less than 0.210 microns coupled with a standard specific gravity (SSG) of less than 2.143. Preferably the copolymer has comonomer units present in an amount from 0.05 mol % and 0.25 mol % and the RDPS is within the range between 0.178 microns and 0.200 microns, coupled with a SSG of less than 2.140. Copolymers produced according to the invention, (perfluorohexyl)ethylene (PFHE) and (perfluorooctyl)ethylene (PFOE), may be shaped into the form of 0.1 inch diameter expanded beading, which expanded beading can have a break strength of at least 10.0 lbs, and which may exceed 13.0 lbs.

A rheology modifying copolymer composition containing a cross-linked copolymer of unsaturated carboxylic acid, a hydrophobic monomer, a hydrophobic chain transfer agent, a cross linking agent, and, optionally, a steric stabilizer, provides increased viscosity in aqueous electrolyte-containing environments.

In one aspect, the present disclosure relates to a surgical device including an anchor body having an opening, the anchor body having a copolymer composition including polylactide-co-glycolide and calcium carbonate, wherein the calcium carbonate comprises more than 30% but less than 40% of the weight of the composition; and a flexible member passing through the opening, wherein deformation of the device occurs at body temperature. The present disclosure also relates to an oriented polymer material having a copolymer composition including a polylactide-co-glycolide and calcium carbonate, the calcium carbonate comprising more than 30% but less than 40% of the weight of the composition, wherein the material changes shape upon introduction to an environment having a temperature that is lower than a relaxation temperature of the material. A method of repairing soft tissue and other surgical devices are also disclosed.

Provided are a delivery system that is useful in delivering a double-stranded ribonucleic acid that functions in gene silencing in glomeruli, particularly in mesangial cells and the like, to the tissue or cells, and the like. A polyion complex in the form of a non-polymeric micelle consisting of a double-stranded ribonucleic acid and a block copolymer represented by the formula (I) or (II) below, which are electrostatically bound together, wherein the polyion complex has an average particle diameter of less than 100 nm as measured by a dynamic light scattering measuring method:wherein each symbol is as defined in the specification.

A multilayer heat-sealable chlorine-free film of relatively low modulus, high interlaminar strength, and low noise upon flexing is provided. The film comprises an odor barrier layer of polyester resin and at least one heat-sealable skin layer, preferably two such skin layers on opposite sides of said odor barrier layer, composed of a homopolymer of ethylene or a copolymer of ethylene and an alpha-olefin or an ester-containing monomer. In a preferred embodiment, the odor barrier layer is formed of polyethylene terephthalate and adhesive tie layers are interposed between the odor barrier layer and the skin layers, resulting in a multilayer film of five layers. Pouches formed of such multilayer films are also disclosed.

The present invention relates to devices, articles, coatings, and methods for controlled active agent release and / or for providing a hemocompatible surface. More specifically, the present invention relates to copolymer compositions and devices, articles, and methods regarding the same for controlled active agent release. In an embodiment, the present invention includes a copolymer composition. The copolymer composition can include a copolymer and an active agent. In an embodiment, the copolymer includes an effective portion of a monomeric unit including a polar moiety. The active agent can be polar. The active agent can be charged. The active agent can be non-polar. In an embodiment, the copolymer composition includes a random copolymer. In an embodiment, the random copolymer includes butyl methacrylate-co-acrylamido-methyl-propane sulfonate copolymer, which can provide reduced platelet adhesion.

The invention relates to the use of a thermal reversible gel, such as a copolymer composition, as a biological filler or implant. The gel has a semi-solid form at body temperature, but upon cooling to a temperature below a threshold level, the gel is liquefied and can be re-shaped, re-sized, manipulated or removed from the body. The gel may be used as a subcutaneous implant, a biological filler, joint or tissue spacer, for wrinkle filling or other cosmetic implants, as a soft-tissue replacement for reconstructive surgery, or as a barrier within the lumen of a biological structure, such as a blood vessel. The implant may be used to provide reversible birth control by providing, for example, a reversible barrier to the cervix or a reversible blockage of the lumen of the vas deferens.

The present invention provides a medical device combined with a polymeric coating material comprising a bioerodable diblock copolymer and optionally a therapeutic agent.

A dual-layer dilatation balloon includes an inner layer that includes a polymer selected from the group consisting of a polyester, polyether, polyamide and copolymers thereof, and an outer layer that includes a polyamide. The dual-layer balloon optionally further includes a stent disposed on the balloon. The stent is optionally a drug-eluting stent. A process for forming a dual-layer dilatation balloon includes forming a dual-layer extrudate having an outer layer that includes a polyamide and an inner layer that includes a polymer selected from the group consisting of a polyester, polyether, polyamide and copolymers thereof. The process also includes forming the dual-layer balloon from the dual-layer extrudate in a balloon forming machine, wherein the balloon has a hoop strength of about 10,000 to about 60,000 p.s.i.

A multilayer heat-sealable chlorine-free odor barrier film having relatively low modulus, high interlaminar strength, and low noise upon flexing is provided. The film comprises an odor barrier layer of an amorphous polyamide resin blended with an anhydride-modified olefinic polymer or copolymer. The film also includes at least one heat-sealable skin layer, preferably two such skin layers on opposite sides of said odor barrier layer, composed of an ethylene polymer or copolymer. Pouches formed of such multilayer films are also disclosed.

The present invention relates to a process for the polymerization of monomers utilizing a bulky ligand hafnium transition metal metallocene-type catalyst compound, to the catalyst compound itself and to the catalyst compound in combination with an activator. The invention is also directed to an ethylene copolymer composition produced by using the bulky ligand hafnium metallocene-type catalyst of the invention, in particular a single reactor polymerization process.

Temperature- and pH-responsive copolymer compositions, and drug delivery devices, conjugates, nanoparticles, and micelles that include the compositions.

This invention relates to copolymer compositions of poly(vinylidene fluoride-2,3,3,3-tetrafluoropropene) copolymers. The copolymers formed have excellent optical properties, corrosion resistance and electrical properties, with very low haze. Tetrafluoropropene monomer units may be present at from 0.5 to 60 weight percent of the copolymer.

Some variations provide a segmented copolymer composition comprising: fluoropolymer first soft segments that are (α,ω)-hydroxyl-terminated and / or (α,ω)-amine-terminated; polyester or polyether second soft segments that are (α,ω)-hydroxyl-terminated and / or (α,ω)-amine-terminated; isocyanate species possessing an isocyanate functionality of 2 or greater; and polyol or polyamine chain extenders or crosslinkers, wherein the molar ratio of the second soft segments to the first soft segments is less than 2.0. Exemplary segmented copolymers are disclosed. The segmented copolymer composition may be present in a low-friction, low-adhesion coating. Such a coating may be characterized by a coefficient of friction, measured at 90% relative humidity, less than 0.7. Such a coating may be characterized by an average kinetic delay of surface ice formation of at least 10 minutes at −10° C. These coatings are useful as bugphobic and icephobic coatings.

This invention provides an embolization material used for blocking a blood vessel in vivo for stopping the blood flow. The most suitable embolization material has a water swelling ratio of 30% or more, is degradable in a phosphate buffered saline, is formed as virtually spherical particles, and is preferably composed of a water insoluble poly(ethylene glycol) copolymer, wherein when the film formed from said polymer is saturated with water, it has an elastic modulus in tension of 1500 MPa or less. The embolization material of this invention can reliably block a blood vessel at an intended site without causing cohesion or clogging in a catheter or in the blood vessel at other than the intended site. Thereafter, the blocked site concerned can be liberated from the embolized state by degradation, and the degraded components can be metabolized or excreted outside the body.

A method of preparing and using a drag-reducing composition in a well treatment operation includes the step of preparing the drag-reducing composition by mixing a polymer emulsion that includes a first surfactant and a first solvent, with a second surfactant and a second solvent. The method continues with the step of combining the drag-reducing composition with an aqueous treatment fluid. The method further includes the step of injecting the drag-reducing composition and aqueous treatment fluid into a subterranean formation, a pipeline or a gathering line.

A poly(siloxane) copolymer composition comprising: a first polymer comprising a first repeating unit, and a poly(siloxane) block unit, a second polymer different from the first polymer and comprising of bromine; and optionally, one or more third polymers different from the first polymer and second polymer; wherein siloxane units are present in the composition in an amount of at least 0.3 wt %, and bromine is present in the composition in an amount of at least 7.8 wt %, each based on the sum of the wt % of the first, second, and optional one or more third polymers; and further wherein an article molded from the composition has an OSU integrated 2 minute heat release test value of less than 65 kW-min / m2 and a peak heat release rate of less than 65 kW / m2, and an E662 smoke test Dmax value of less than 200.

Provided is an inkjet recording ink including: a resin nanoparticle having a core-shell structure containing a core and a shell; a pigment; a water-soluble organic solvent; and water, wherein the core is composed of a poly(meth)acrylate resin, and wherein the shell is composed of a polycarbonate-polyurethane copolymer. Also provided is a process for producing the inkjet recording ink, an inkjet cartridge containing the inkjet recording ink, an inkjet recording apparatus containing the inkjet cartridge, and an inkjet recorded image including the inkjet recording ink located on a recording medium.

Disclosed herein is a conductive copolymer. The conductive copolymer can prevent water-absorbance, lower the concentration of polyacid contained in a molecule and exhibit superior film characteristics and excellent storage stability via a reduction in aggregation between molecules, as well as impart improved efficiency and lifetime to optoelectronic devices. The conductive copolymer includes a conductive polymer doped with a polyacid copolymer represented by Formula 1 below:Further disclosed are a conductive copolymer composition, a conductive copolymer composition film and an organic optoelectronic device, each including the conductive copolymer.

The present disclosure relates to compositions comprising a copolymer that includes a first monomer and a second monomer that is different from the first monomer, wherein both the first and second monomer are selected from the group consisting of 3-sulfopropyl acrylate potassium salt, sodium acrylate, N-(tris(hydroxyl methyl)methyl)acrylamide, and 2-acrylamideo-2-methyl-1-propane sulfonic acid. The present disclosure further relates to methods for preparing the copolymer compositions and shaped articles comprising the copolymers.

The present invention relates to a sinter powder composed of polyamide which also comprises PMMI, PMMA, or copolymers with PMMI, in particular PMMI-PMMA copolymers, to the use of this sinter powder for laser-sintering, and also to moldings produced from this sinter powder. The moldings made from the powder of the invention have marked advantages over conventional products in their appearance and in their surface quality, especially as far as roughness and dimensional stability during selective laser sintering (SLS) are concerned. In addition, moldings produced from the sinter powder of the invention also have better mechanical properties than moldings based on conventional nylon-12 powders, in particular in terms of modulus of elasticity and tensile strength. These moldings also have a density close to that of injection moldings.

Medical devices, such as stents, fabricated at least in part from a polymer composite including a biodegradable elastomeric phase dispersed within a biodegradable polymeric matrix are disclosed. The composite is composed of a block copolymer including an elastomeric homopolymer block and a glassy polymer block.

Polyester compositions are disclosed that include polyester polymers or copolymers having incorporated therein metallic nickel particles that improve the reheat properties of the compositions. Processes for making such compositions are also disclosed. The nickel particles may be incorporated in the polyester by melt compounding, or may be added at any stage of the polymerization, such as during the melt-phase of the polymerization. A range of particle sizes may be used, as well as a range of particle size distributions. The polyester compositions are suitable for use in packaging made from processes in which a reheat step is desirable.

Polyester compositions are disclosed that are suitable for molding, and that include polyester polymers or copolymers having incorporated therein metallic tungsten particles that improve the reheat properties of the compositions. Processes for making such compositions are also disclosed. The tungsten particles may be incorporated in the polyester by melt compounding, or may be added at any stage of the polymerization, such as during the melt-phase of the polymerization. A range of particle sizes may be used, as well as a range of particle size distributions. The polyester compositions are suitable for molding, and for use in packaging made from processes in which a reheat step is desirable.

This invention relates to a new adhesive coating composition, particularly for use on airbag fabrics, which is composed of a crosslinked blend of a polyalkyl- or polyphenylsiloxane with vinyl functionality and a copolymer of ethylene and methyl acrylate. This coating provides excellent adhesive properties to the coated fabric, in that it restricts the movement, when put under stress, of the yarns constricting that fabric, which are situated adjacent to seams in the fabric. This reduces the effect known in the trade as combing. Fabric treated with this material in the mainer described herein, requires a marked increase in the amount of force required for this yarn movement. This distortion of the fabric can be detrimental in an automotive airbag, in that, it may result in the loss of inflating air, and under extreme conditions may result in a seam failure.

An anti-corrosive polymeric complex which is comprised of a plurality of double-stranded molecular complexes. Each of the molecular complexes are comprised of a strand of a conductive polymer and a strand of a copolymer. The strands of the polymeric complex are non-covalently bonded to each other along the contour of the strands to form a side-by-side, twisted, double-stranded configuration.

A thermally conductive compound which comprises 15 to 60 volume % of thermoplastic carrier resin consisting of a copolymer of a plasticizer with ethylene or of a polymer of the plasticizer, polyethylene and the copolymer, 40 to 85 volume % of thermally conductive filler particles dispersed in the carrier resin, and 0.5 to 5 weight % (for the filler particles) of a dispersing agent having (a) hydrophilic group(s) and (a) hydrophobic group(s). The thermally conductive compound has a high thermal conductivity and a plasticity in the range of temperatures of -40 to 50° C., and when it is interposed between an insulator body and a semiconductor element mounted thereon or between the semiconductor element and a cap, the heat generated by an operation of the semiconductor element is rapidly transferred and the thermal stress caused by the difference of coefficients of thermal expansion between the semiconductor element and the insulator body or cap is absorbed and relieved to cause no phase separation between them. The semiconductor device using the thermal compound, accordingly, is highly reliable.