Class / Patent application number | Description | Number of patent applications / Date published |
526088000 | Polymerization involving specified mixing, stirring, agitating, or movement of material | 25 |
20080214751 | Process and Apparatus for Manufacturing a Styrene Polymer in a Mechanically Stirred Reactor - A process and apparatus for the (co) polymerization of styrene. The process is carried out by employing a liquid polymerization reaction mixture that includes styrene, in a mechanically stirred reactor in the form of a vessel comprising a side wall having the shape of a cylinder of revolution with a vertical axis (A), a bottom head and a top head that are joined to the side wall, the vessel being provided with a mechanical stirring device comprising (i) a central shaft of vertical axis coincident with the axis (A), connected to a drive system comprising a motor for rotating the central shaft, (ii) at least one baffle attached to the vessel, which process is characterized in that the baffle is away from the side wall of the vessel and takes the form of a cylinder of vertical axis and of rhomboidal cross section. | 09-04-2008 |
20090005521 | SYSTEM AND PROCESS FOR PRODUCTION OF POLYVINYL CHLORIDE - A method is disclosed for producing polyvinyl chloride which includes mixing a vinyl chloride solution with an initiator solution in at least one high shear mixing device comprising at least one rotor/stator set producing a rotor tip speed of at least 5.1 m/sec (1000 ft/min), to form a polymerization mixture; and allowing the mixture to polymerize by free radical polymerization to form polyvinyl chloride. The polymerization mixture may be subjected to free radical polymerization conditions comprising a temperature in the range of about 20° C. to about 230° C. In some embodiments, the high shear mixing device produces a shear rate of at least 20,000 s | 01-01-2009 |
20090018286 | SYSTEM AND PROCESS FOR PRODUCTION OF POLYETHYLENE AND POLYPROPYLENE - A method for producing a polyethylene or polypropylene polymer, or co-polymer thereof, comprises contacting a monomer-containing medium with polymerization catalyst particles in at least one high shear mixing device to form a nanodispersion, wherein the particles have a mean diameter less than 1 micron. The monomer is selected from the group consisting of ethylene, propylene, and combinations thereof. The method further includes subjecting the nanodispersion to polymerization conditions comprising pressure in the range of about 203 kPa to about 6080 kPa (about 2 atm to about 60 atm) and temperature in the range of about 20° C. to about 230° C., whereby at least a portion of the monomer is polymerized. A system for carrying out the method is also disclosed. | 01-15-2009 |
20090105431 | PROCESS FOR PREPARATION OF PASTABLE POLYMERS - The present invention relates to a single-stage batch process for preparation of pastable polymers, in particular of vinyl chloride homo- and copolymers, by the microsuspension process, where these in a blend with plasticizers give PVC pastes, also termed plastisols, with very low viscosities and with very low emulsifier contents. | 04-23-2009 |
20090131612 | Microchannel polymerization reactor - A microchannel polymerization reactor comprising: (a) a first microchannel adapted to carry a reactant stream; (b) a fluid conduit adapted to carry a fluid in thermal communication with the first microchannel; and (c) a static mixer in fluid communication with the first microchannel adapted to provide a mixing zone operative to change the cross-sectional fluid flow profile at a predetermined point along the first microchannel without changing the primary direction of the reactant stream through the first microchannel. The present invention also includes a method of carrying out a polymerization reaction within a microchannel reactor comprising: (i) directing at least one of monomer, initiator, water, surfactant, coagulant, and solvent into a reactant stream and into contact with reactant flowing within a first microchannel to initiate a polymerization reaction occurring within a first microchannel; and (ii) mixing the reactant of the reactant stream by positioning at least one static mixer in series with the reactant stream, where the static mixer is adapted to change a cross-sectional fluid flow profile of the reactant stream flowing through the first microchannel without changing a primary direction of the reactant stream through the first microchannel. | 05-21-2009 |
20090240007 | METHOD OF PRODUCING POLYESTERS - Polyesters such as polyethylene, polypropylene and polybutylene terephthalate are made from melts of precondensates of polyesters by first conducting vapors comprising precondensate components distributed in the form of an aerosol through a polycondensation reactor in which precondensate components are deposited on the reactor wall and in an outlet chamber of the reactor on a separator. Then the deposits are conducted to the unstirred discharge sump. Upper layers of the discharge sump are continuously recirculated in the stirred reactor area and thus subjected to reconversion and further polycondensation. | 09-24-2009 |
20090281257 | INDUSTRIAL SYNTHESES PROCESS OF HIGH TRAN-1, 4-POLYISOPRENE - A synthesis process of trans-1,4-polyisoprene, using bulk precipitation polymerization of isoprene catalyzed by supported titanium catalyst TiCl | 11-12-2009 |
20090318641 | METHOD OF FABRICATION OF NANOPARTICULATE COMPOSITES USING MONOMER STABILIZATION - An improved method is provided to prepare reinforced resin nanocomposites without the need of surfactants or coupling agents. The present invention comprises the use of monomers for improving the dispersion of nano-sized materials and enhancing the particle/matrix interaction. One comprises mixing a plurality of nanoparticles with a monomer resin to form a mixture, blending a catalyst and a promoter with the mixture, and curing the blended mixture to form a polymerized nanocomposite. The monomers, which serve to stabilize the nanoparticles, are covalently bound onto the nanoparticle surface and copolymerize with non-bound monomers after introduction of a catalyst and a promoter that initiate polymerization. Without any additional surfactant or coupling agent, the resin is chemically bound onto the nanoparticle surface and protects the iron nanoparticles from agglomeration and oxidation. | 12-24-2009 |
20100010176 | Method for the Production of Water Absorbent Polymer Particles by Polymerizing Drops of a Monomer Solution - A process for preparing water-absorbing polymer beads by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, the initiator being added to the monomer solution from 0.5 to 60 seconds before the droplets are generated. | 01-14-2010 |
20100016525 | Installation for Gas-Phase Polymerisation - Installation for the gas-phase polymerisation of at least one olefinic monomer, comprising a horizontal stirred reactor ( | 01-21-2010 |
20100029867 | GAS PHASE POLYMERIZATION APPARATUS AND METHOD FOR PRODUCING OLEFIN POLYMER - A gas phase polymerization apparatus | 02-04-2010 |
20100069584 | APPARATUS AND METHOD FOR RECOVERING POLYMER - The present invention provides an apparatus for recovering a polymer from polymer solution, and a method of recovering a polymer using the apparatus. The apparatus includes a polymer solution-storage tank for storing a polymer solution; a polymer solution feeding pump for pumping the polymer solution from the polymer solution storage tank; an antisolvent storage tank for storing an antisolvent; an antisolvent feeding pump for pumping the antisolvent from the antisolvent storage tank; a reaction chamber to which the polymer solution pumped by the polymer solution feeding pump and the antisolvent pumped by the antisolvent feeding pump are supplied; a high-speed mixer that is rotated in the reaction chamber at a speed range of 1000 to 30000 rpm, mixes the polymer solution with the antisolvent under a shearing force corresponding to a tip speed of 5 to 30 m/sec, and precipitates a polymer; and a precipitate storage tank for storing the precipitation mixture of the polymer and the solvent/antisolvent. | 03-18-2010 |
20100152396 | PROCESS AND APPARATUS FOR TREATING VISCOUS PRODUCTS - In a process for treating viscous products, especially for performing polymerization processes, especially for homo- or copolymerizing thermoplastics and elastomers, wherein monomer(s) and/or catalysts and/or initiators are added to a backmixed mixing kneader, especially with a length/diameter ratio of 0.5-3.5, heat is supplied to the product which is backmixed with already reacted product and the reacted product is removed from the mixing kneader, the product in the mixing kneader shall be heated up to its boiling temperature, portions of the product shall be evaporated and exothermicity of the product shall be absorbed by evaporative cooling. | 06-17-2010 |
20100168348 | ANIONIC SPRAY POLYMERIZATION OF STYRENE - The invention relates to a process for continuously preparing styrene polymers by anionic spray polymerization, which comprises
| 07-01-2010 |
20100261858 | NANOHYBRID POLYMERS FOR OPHTHALMIC APPLICATIONS - The present invention relates to novel materials particularly useful for ophthalmic applications and methods for making and using the same. More particularly, the present invention relates to relatively soft, optically transparent, foldable, high refractive index materials particularly suited for use in the production of intraocular lenses, contact lenses, and other ocular implants and to methods for manufacturing and using the same. | 10-14-2010 |
20100324233 | Catalyst Feed Systems and Methods for Using the Same - Catalyst feed systems and processes utilizing such systems are described herein. Some embodiments disclosed herein relate to a process for improving the flowability of catalyst in a catalyst feed system, including providing a catalyst feed vessel with at least one heat exchange system for maintaining the catalyst system temperature below a critical flow temperature. Also disclosed is a catalyst feed system for the polymerization of olefins including a catalyst feed vessel; and a heat exchange system for maintaining a temperature of a catalyst within the catalyst feed vessel. Additionally disclosed is a process for polymerization of olefins including maintaining a supported catalyst in a catalyst feed vessel below a critical flow temperature of the catalyst; feeding the catalyst to a polymerization reactor; and contacting the catalyst with an olefin to form a polyolefin. | 12-23-2010 |
20110172377 | Gas-Phase Polymerization Process - A process for polymerizing one or more olefins in a gas-phase polymerization reactor is provided. The gas-phase reactor has a fluidized bed and a fluidizing medium. The fluidizing medium has an operating density and an operating velocity. The process includes determining a critical gas velocity and/or determining a critical gas velocity for the polymerization. The operating gas density and/or the operating gas velocity for the fluidizing medium is then adjusted to be less than or equal to its respective critical value. The process includes increasing the bulk density of the fluidized bed. The increase in the fluidized bed bulk density increases productivity without increasing reactor residence time. | 07-14-2011 |
20120035337 | NANOHYBRID POLYMERS FOR OPHTHALMIC APPLICATIONS - The present invention relates to novel materials particularly useful for ophthalmic applications and methods for making and using the same. More particularly, the present invention relates to relatively soft, optically transparent, foldable, high refractive index Materials particularly suited for use in the production of intraocular lenses, contact lenses, and other ocular implants and to methods for manufacturing and using the same. | 02-09-2012 |
20120071613 | Mixing Kneader and Process for Preparing Poly(Meth)Acrylates Using the Mixing Kneader - The invention relates to a mixing kneader comprising at least two shafts ( | 03-22-2012 |
20120130029 | PROCESS FOR THE INTRODUCTION OF A POLYMERISATION CATALYST INTO A GAS-PHASE FLUIDISED BED - Process for introducing a polymerisation catalyst in solid form into a gas-phase fluidised bed using an injection device having an inner tube of internal cross-sectional area of 10-100 mm | 05-24-2012 |
20120309912 | Polymerization Reactor and Related Process - Provided is a stirred tank polymerization reactor system having a reactor tank, a stirring assembly including a rotatable shaft that extends through a wall of the tank, and a triple barrier mechanical seal. The mechanical seal includes an outer cylinder mounted in the wall of the tank, an inner cylinder that is rotatable relative to the outer cylinder and connected to the shaft, and first, second, and third fluid barrier seals mounted between the outer and inner cylinders at different positions along the axis of rotation of the inner cylinder. First and second sources of pressurized barrier fluid are connected between the first and second pressure fluid barrier seals and the second and third barrier seals, respectively. The three barrier seals advantageously “step down” the differential pressure experienced by the uppermost barrier seals, substantially reducing mechanical stresses experienced by the annular sealing rings and seats. The mechanical seal can further include a closed loop cooling channel in its outer cylinder that is connected to a circulating source of cooling fluid. | 12-06-2012 |
20130041118 | Horizontal agitator - The invention is an improved apparatus for continuously stirring polymer particles in reactive gas-filled polymerization reactors incorporating contiguous paddle stations on a coaxial drive shaft wherein the drive shaft is driven by a hydraulic motor. | 02-14-2013 |
20130197170 | CONTINUOUS PROCESS FOR PREPARING POLYFLUOROACRYLATE PARTICLES - The present invention is directed to a continuous process for preparing a crosslinked polymer comprising a fluoro group. | 08-01-2013 |
20130296509 | PROCESS FOR OPERATING A MIXING KNEADER - The invention relates to a process for operating a mixing kneader, comprising one or more shafts on whose surfaces are disposed kneading bars and which are surrounded by a casing, comprising the following steps: | 11-07-2013 |
20140080981 | METHOD AND APPARATUS FOR PREPARING POLYMER BEADS OF UNIFORM PARTICLE SIZE BY SUSPENSION POLYMERISATION - Monomer solution and liquid solution immiscible with the monomers in the monomer solution are cocurrently jetted upwardly in a pulsating manner in a reaction vessel. Monomer droplets are allowed to rise up in a controlled and smooth manner under the dynamic forces exerted by differential flow rate and differential pressure between the monomer and liquid solutions and the differential densities between the monomer and liquid solutions without causing coalescence, agglomeration and breakup of the monomer droplets and to stabilize by partial polymerization of the droplets at 50-60° C. The monomer droplets flow out horizontally into a polymerization reactor and get polymerized in the polymerization reactor under agitation at 80-85° C. The polymer beads are dried at 80-100° C. and sieved. | 03-20-2014 |