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7601795 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production
The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a slurry or cake carboxylic acid product without isolation of a substantially dry carboxylic acid...
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7557170 |
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...
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7511096 |
Crosslinked polyvinyl acetals
The invention relates to methods for producing crosslinked polyvinyl acetals, according to which a polyvinyl alcohol (A1) containing carboxyl groups is crosslinked by (i) reacting the polymer (A1)...
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7473743 |
Surface finish of reactor
This invention discloses the use in the production of a polyolefin of a slurry loop reactor wherein all internal parts in contact with the slurry are polished first by a mechanical process to a...
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7459519 |
Method for manufacturing electrically conductive macromolecules and solid state electrolytic capacitor using electrically conductive macromolecules
The method for manufacturing electrically conductive macromolecules of the present invention is provided by reacting at least a monomer and an oxidizing agent to obtain electrically conductive...
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7214760 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production
The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a slurry or cake carboxylic acid product without isolation of a substantially dry carboxylic acid...
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7022780 |
Device for the continuous process for the production of controlled architecture materials
The device of the present invention delivers reactants to a reaction zone in a plug flow reactor. The feedblock encircles the reaction zone. Reactants enter the feedblock through an inlet port...
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7015290 |
Method of preparing a polymer under predetermined temperature conditions, and apparatus therefor
A method of preparing a polymer under predetermined temperature conditions comprises conducting the polymerization within a closed reaction chamber configured such that most or all of an inner...
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6982236 |
Process to polymerize olefins
This invention relates to a method to prepare a supported catalyst system comprising preparing a combination comprising 1) a first supported catalyst system comprising a support, an activator and a...
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6921797 |
Method of reducing metal content in fluorine-containing elastomer
To provide a method of reducing contents of metal components of a fluorine-containing elastomer through preparation thereof and a molded article obtained from the fluorine-containing elastomer...
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6913826 |
Biodegradable polyester polymer and method for preparing the same using compressed gas
In polymerizing biodegradable polymer material, a compressed gas is used as a reaction solvent for a solution-polymerization, in order to prepare biodegradable polyester homopolymer and copolymer...
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6906150 |
Heat exchanger polymerization reactors for manufacturing drag reducing agents
Temperature control and efficient heat transfer are important to producing high quality polymer drag reducing agents from alpha-olefin and/or other monomers. Many polymerization reactions are...
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6906149 |
Polymer scale deposition preventive agent
Provided is a polymer scale deposition-preventive agent. It includes (A) a condensation reaction product of an aldehyde compound and a hydroxynaphthalene compound and (B) a soluble methoxyl...
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6894125 |
Scale deposit inhibitor, process for its production, polymerizer whose inside wall is covered with the inhibitor, and process for production of vinylic polymers by the use of the polymerizer
A scale adhesion preventing agent for use in a polymerization reactor, consisting essentially of a condensate of a phenol represented by the following formula (1), a 1-naphthol and an aldehyde,...
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6887955 |
Method for high pressure polymerization of ethylene
In a process for the polymerization of ethylene and optionally further monomers in a high-pressure reactor at from 120 to 350° C. and pressures of from 1000 to 4000 bar, hydrogen is intermittently...
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6852827 |
Polyester production process and reactor apparatus
The invention provides a polyester production process by bulk polymerization in a reactor, wherein the volume of the resulting polyester is shrunk for a release from the inner surface of the...
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6831138 |
Polymer-containing organo-metal catalysts
The invention relates to polymer-containing catalysts (e.g., polymer-containing organo-metal catalysts) that may be useful in various applications (e.g., polymerization of macrocyclic oligoesters)....
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6780809 |
Catalyst for the (co)polymerization of ethylene and a method for the preparation thereof
A particulate, modified chromium oxide catalyst for the polymerisation of ethylene or ethylene with α-olefins, comprising: a) a chromium-oxide catalyst, b) a transition metal compound, and c) a...
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6716934 |
Method for producing ethylene-vinyl acetate copolymer, saponified product of copolymer prepared by the method, and molded product containing the same
The present invention provides a method for producing an ethylene-vinyl acetate copolymer (EVA) containing 5 mol % to 60 mol % of ethylene, by copolymerizing ethylene and vinyl acetate with a...
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6706854 |
Process for preparing reabsorbable polyesters by mass polymerization
The invention relates to a process for preparing reabsorbable polyesters by bulk polymerisation, wherein the reaction components are melted and homogenised in a stirred reactor, the reaction...
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6706846 |
Method for end-capping polycarbonate resins and composition for use in same
A method for end-capping polycarbonate resins, comprising the step of processing a mixture comprising a polycarbonate having free hydroxyl-end groups and an end-capping reagent in a melt...
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6703454 |
Adsorber system to replace water column in a polyester process
The present invention provides a process for recovering a dihydroxy compound from a fluid stream that results from the preparation of a polyester by use of an adsorption system to selectively...
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6613868 |
Process for producing polycarbonates
A process for the production of polycarbonate is disclosed. The process, representing an improvement over the known interfacial polycondensation process entails introducing into the loop of a...
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6506854 |
Inhibiting scale in vinyl monomer polymerization
Disclosed is a solution that comprises (A) a solvent; (B) about 0.001 to about 20 wt % of a terpolymer that comprises the condensation reaction product of (1) an aromatic compound that contains a...
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6376625 |
Process for purifying polyethers
This invention involves several ways for improving a coalescing process for purifying a crude polyether. In one aspect, particulate zirconium dioxide is selected as a coalescing medium. In a second...
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6362291 |
Process for producing a polymer by polymerization of a monomer having an ethylenic double bond
A process for producing a polymer by polymerizing in a polymerization vessel a monomer having an ethylenic double bond is provided. In this process, the polymerization vessel has a polymer scale...
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6335402 |
Solid reactor with an antistatic coating for carrying out reactions in a gaseous phase
The inner wall of a solids reactor for carrying out reactions in the gas phase is coated with an antistatic layer having a thickness of 0.1-800 μm and consisting essentially of a poly-α-olefin...
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6303712 |
Process for producing vinyl chloride polymer
In a process for producing a vinyl chloride polymer by suspension polymerization in a polymerization vessel having a coating film of a polymer scale preventive agent on the polymerization vessel...
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6300429 |
Method of modifying near-wall temperature in a gas phase polymerization reactor
A falling film of water is applied around the periphery of a fluid bed olefin polymerization reactor to cool the wall and reduce the temperature in the fluid bed near the inside surface of the...
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6291600 |
Method of preventing scale adhesion to the surfaces of a polymerization tank
In a novel method of homo- or copolymerization of vinyl chloride, a specified coating agent is applied on the surfaces of the portions which will become into contact with the vinyl chloride monomer...
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6274690 |
Preparation of vinyl chloride polymer
A vinyl chloride polymer is prepared by charging a reactor with a vinyl chloride monomer, effecting polymerization, removing a slurry of the polymer from the reactor, and washing the reactor...
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6271320 |
Method for the production of a polymer dispersion by radical aqueous emulsion polymerization with a continuously produced aqueous monomer emulsion
A polymer dispersion is prepared by free radical polymerization of an aqueous monomer emulsion by a process in which the monomer emulsion is prepared continuously at the rate of consumption.
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6268441 |
Method for polymerizing vinyl monomers
Vinyl monomers are polymerized in the aqueous phase in the presence of at least one N-oxyl compound of a secondary amine, having no hydrogen atoms bonded to the α carbon atoms. This process...
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6252015 |
Process for the production of polymer
A process, particularly a gas phase fluidised bed process, for the production of polymers avoids formation of sheets or chunks within the reactor, without the need to use antistatic agents, which...
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6209552 |
Method of preventing or reducing formation of polymeric deposits in vessels during emptying
A method of emptying vessels containing dispersions, solutions or suspensions of polymers in which during the emptying process the liquid medium also used to take up the polymers into the...
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6180728 |
Apparatus for the production of polyadducts of alkylene oxides with a combined liquid-in-gas and gas-in-liquid dispersion reactor
The present invention relates to apparatus for the semi-continuous polymerization of monomers with the use of a chain initiator. This apparatus is characterized in that it comprises a reactor (1)...
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6174986 |
Polymerization of vinyl chloride
A process for polymerizing a vinyl chloride monomer wherein the vinyl chloride monomer is subjected to homopolymerization or (co)polymerization with a monomer copolymerizable with the vinyl...
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6172183 |
Process and apparatus for the cleaning of crude tall oil soap
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6166107 |
Method for producing an optical rod-shaped graded-index polymer preform, preform obtained in accordance with this method and optical lens and optical fibre obtained by using same
A method for producing optical rod-shaped graded-index polymer preform by making the composition of the preform near the core differ from the composition of the shell of the preform by...
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6156853 |
Deposit suppressant composition for a polmerization reactor and a method of polymerizing vinyl monomers with use of said deposit suppressant composition
Disclosed are a deposit suppressant composition for the internal surfaces of a polymerization reactor for polymerizing a vinyl monomer, including a polyhydric phenol sulfide compound having an...
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6121390 |
Process of producing vinyl chloride polymer by using condensation product of dimer of 2,3-dihydroxynaphthalene and formaldehyde
There is provided a polymer scale deposition preventive agent, comprising an alkaline solution of a condensation product having a molecular weight of 500 to 1,000,000 obtained by condensing a dimer...
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6114475 |
Reactor drying by addition of compound that lowers boiling point of water
There is provided a process for drying a fluidized reactor system comprising introducing a boiling point depressing agent into said system optionally while heating said system.
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6100369 |
Process for continuously producing polyesters
A method for continuously producing a polyester by continuously melt-polymerizing a raw material consisting of a dicarboxylic acid component composed of mainly an aromatic dicarboxylic acid and...
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6080332 |
Procedure for the anti-scaler production for coating the polymerizing reactor and respective resultant product
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6069199 |
Anti-scaling agent for coating of polymerization reactors
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6001937 |
Reducing scale in vinyl polymerizations
Disclosed is a method of inhibiting the formation of scale on reactor surfaces in contact with a polymerizing vinyl monomer. The reactor surfaces are contacted with a composition that contains, as...
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5965094 |
Polymerization process with anti-scaling agents
According to the invention, there are provided a novel process for preparing an anti-scaling coating on the walls of a polymerization vessel by using aromatic compounds reacted with sodium...
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5888589 |
Procedure for the anti-scaler production for coating the polymerizing reactor and respective resultant product
This invention relates to a process for producing an anti-scaler product for coating polymerization reactors comprising condensing a naphthol with an aldehydic cross-linking agent, wherein the...
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5789499 |
Polymerization process of vinyl chloride in the presence of oxygen
A process is provided for the polymerization of vinyl chloride in a closed mode. According to the process, oxygen is caused to exist in a polymerizer, which is coated with an anti-fouling agent,...
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5780104 |
Method for preventing the inner wall surfaces of the polymerization apparatus from being fouled with scale during the polymerizatioin of vinyl chloride
A method for the homopolymerization or copolymerization of vinyl chloride, wherein the inner wall of the polymerizer and the like are prevented from being fouled with the resulting polymer by...
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