Class / Patent application number | Description | Number of patent applications / Date published |
526062000 | POLYMERIZING IN REACTOR OF SPECIFIED MATERIAL, OR IN REACTOR IN WHICH SURFACE CONTACTING POLYMERIZING MATERIAL HAS BEEN TREATED | 11 |
20090062484 | Method for Reducing Depositions in Polymerization Vessels - The method of polymerization includes the steps of a) providing a catalyst system, b) providing at least one monomer or comonomer mixture in a reaction vessel, c) introducing the catalyst into the reaction vessel, and d) polymerizing the at least one monomer or comonomer mixture to produce an isoolefin polymer. The catalyst may be soluble in the diluent used for polymerization. The polymerization contact surfaces of the reaction vessel have an arithmetic average surface roughness of less than 0.3 μm (12 microinches). | 03-05-2009 |
20090118443 | Gas Phase Polymerization And Distributor Plate Passivation Treatment - Apparatus and methods for gas phase polymerization are provided. The method can include polymerizing one or more olefins at gas phase conditions in a reactor comprising one or more process exposed surfaces in the presence of a catalyst system; and treating at least a portion of the one or more process exposed surfaces prior to injecting the catalyst system to reduce the number of surface hydroxyls or access of the catalyst system to the surface hydroxyls on the process exposed surfaces. | 05-07-2009 |
20100010173 | Production of Super Absorbent Polymers on a Continuous Belt Reactor - The invention relates lo a process for production of super absorbent polymers on a continuous belt reactor, wherein a continuous polymerization belt rests at least partly upon the upper surface of at least one continuous support belt. | 01-14-2010 |
20100076164 | METHODS AND DEVICES FOR POLYMERIZATION - A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high molecular weight polymer coating on the walls of the reactor. Furthermore, a device for and method of introducing the chromium-containing compound into the fluidized bed reactor at a plurality of locations in proximity to a lower section of a bed section wall of the fluidized bed reactor, and forming a high molecular weight polymer coating on the bed section wall. | 03-25-2010 |
20100184927 | METHODS FOR APPLYING SOLUTION CATALYSTS TO REACTOR SURFACES - A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally (where a catalyst component of the solution catalyst comprises at least one chromium containing compound) oxidizing at least some of the applied chromium containing compound in a controlled manner. | 07-22-2010 |
20100261854 | POLYMER SCALE DEPOSITION INHIBITOR AND PROCESS FOR PRODUCING POLYMER WITH THE SAME - Provided is a polymer scale adhesion preventive agent for use in the polymerization of a monomer having an ethylenic double bond, the polymer scale adhesion preventive agent including: (A) a condensation reaction product of an aldehyde compound and a hydroxynaphthalene-based compound, and (B) (B1) an organophosphoric acid compound, or (B2) an inorganic phosphoric acid compound having 3 or more phosphorus atoms, or a combination thereof. According to the present invention, a scale preventive coating having satisfactory scale adhesion prevention performance can be formed with a high degree of productivity via a single-stage application. Further, even if a multitude of polymerization batches are repeated under high-temperature polymerization reaction conditions, the adhesion of polymer scale to the inner wall surfaces and the like of the polymerization vessel can be effectively prevented. Moreover, because the thickness of the scale preventive agent layer can be suppressed to not more than 0.2 mm, problems such as a deterioration in the heat removal capabilities of the polymerization vessel jacket, or the problem in which detached portions of the scale preventive agent layer becoming incorporated within the polymer product, causing colored foreign matter, can be suppressed, meaning a polymer product of improved quality can be obtained. | 10-14-2010 |
20140275448 | METHODS AND APPARATUS FOR CONTROLLED SINGLE ELECTRON TRANSFER LIVING RADICAL POLYMERIZATION - This invention provides methods for controlled single electron transfer living radical polymerization (SET-LRP) of monomers with increased conversion, high molecular weights and low polydispersity by allowing the polymerization to proceed at low temperatures via a tubular reactor either made of copper or containing copper metal surface. | 09-18-2014 |
20150080539 | POLYMERIZATION REACTOR AND METHOD FOR PRODUCING WATER ABSORBENT RESIN - A polymerization reactor of the present invention includes a container body | 03-19-2015 |
20160136611 | Continuous Solid-State Polymerization Device and Method - A continuous solid-state polymerization device according to the present invention comprises: a feeder for injecting a prepolymer continuously; a transverse reactor connected to the feeder via a first connector to receive the prepolymer from the feeder and to perform solid-state polymerization, the reactor itself rotating; and a chamber connected to the transverse reactor via a second connector to receive a polymer, which has been discharged from the transverse reactor, and solid-state polymerization of which has been completed, and to discharge the polymer, wherein the transverse reactor has a demolding coating film formed on the inner wall thereof, and the feeder, the transverse reactor and the chamber are in a vacuum state. The continuous solid-state polymerization device can prevent formation of an interval, in which the prepolymer stagnates, and can perform solid-state polymerization continuously in a vacuum state without using inert gas. | 05-19-2016 |
20160144337 | Continuous Solid-State Polymerisation Device and Method - The continuous solid-state polymerisation device of the present invention comprises: a feeder for continuously introducing a prepolymer; a horizontal reactor which is connected via a first connecting part to the feeder and receives the prepolymer from the feeder so as to subject same to solid-state polymerisation, wherein the reactor itself is rotated; a stirring device which comprises a stirring shaft rotating inside the horizontal reactor, in the direction opposite to that of the rotational axis of the horizontal reactor, and comprises stirring blades joined vertically to the stirring shaft; and a chamber which is connected via a second connecting part to the horizontal reactor and, once the solid-state polymerisation has been completed, receives the resulting polymer discharged from the horizontal reactor, and, here, the feeder, the horizontal reactor and the chamber are in a vacuum state. The continuous solid-state polymerisation device prevents the formation of prepolymer stagnation zones, and allows solid-state polymerisation to take place continuously in the vacuum state without any inert gas. | 05-26-2016 |
20160200837 | PROCESS FOR THE (CO-)POLYMERISATION OF OLEFINS | 07-14-2016 |