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7625987 |
Gas phase polymerization and method of controlling same
A process for controlling a continuous gas phase exothermic process in a reactor comprising: (i) effecting a gas phase exothermic reaction under a set of operating conditions in the presence of a...
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7485686 |
Manufacturing method of polyolefin
A large-scale and efficient industrialization of olefin polymerization by metallocene catalysts is realized by, in olefin polymerization by metallocene-based catalysts, increasing catalytic...
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7459487 |
Polymer composite membrane and method of making the same
The present invention provides a polymer composite membrane having a polymer membrane and a poly(furfuryl alcohol) filling internal pores of the polymer membrane. The polymer composite membrane can...
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7402635 |
Process for preparing polyethylene
Disclosed is process for producing polyethylene using a slurry loop reactor. The process includes using a mathematical model to predict a plurality of process control parameters based on the...
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7384589 |
Nanoscale molecularly imprinted polymers and method thereof
Nanoscale molecularly imprinted polymers (MIP) having polymer features wherein the size, shape and position are predetermined can be fabricated using an xy piezo stage mounted on an inverted...
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7381777 |
Method for controlling fouling in slurry-type polymerization reactors
The present invention relates to methods for controlling fouling in the reaction zone of slurry-type olefin polymerization reactors by measuring a process operating parameter and by responding to...
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7343225 |
Method for reducing off-grade product production during reaction transitions
In some embodiments, a method for determining initial conditions for a transition from an initial reaction to a target reaction to minimize (or substantially minimize) the amount of off-grade...
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7335709 |
Polymerizate composition and a method for producing the same
The invention relates to water-soluble, preferably powder-form polymer compositions which are obtained by continuous polymerization of at least one unsaturated monomer. At least one parameter that...
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7332549 |
Process for the (co-)polymerisation of ethylene in the gas phase
The present invention relates to a process for improving the start up of polymerization or copolymerization of ethylene in a gas phase reactor, preferably a fluidized bed gas phase reactor.
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7329712 |
Swell control in slurry loop reactor
The present invention discloses a method for controlling the onset and development of swelling in a slurry loop reactor by progressively diluting the reactor, the amount of dilution being driven by...
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7315369 |
Method and apparatus for monitoring polyolefin production
The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits of a polyolefin production system. The Raman probe or other spectroscopic probes may be...
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7276564 |
Process for the (co-)polymerization of ethylene in the gas phase
The present invention relates to a process for improving the start up of polymerization or copolymerization of ethylene in a gas phase reactor, preferably a fluidised bed gas phase reactor.
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7074481 |
Adhesives for semiconductor applications efficient processes for producing such devices and the devices per se produced by the efficient processes
Die attach adhesives and methods for their use, along with the devices that are obtained by the use of the methods. Using semiconductor chips as an example, the adhesives and the method for using...
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7024313 |
Method of estimating the properties of a polymer product
The present invention relates to a method of estimating the properties of a polymer product by using converted process variables (cPV's) which means process variable that final or intermediate...
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6988022 |
Method for online estimation of reactor split for multimodal polyolefins
The present method is directed to techniques for estimating and periodically controlling the reactor split of alpha-olefin polymerizations using multiple catalysts that selectively incorporate...
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6887968 |
Process for the recycling of polycarbonates
A process for making a high molecular weight (co)polycarbonate resin is disclosed. The process entails (i) obtaining at least one member selected from the group low molecular weight residue (weight...
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6864331 |
Process for the production of polymers
Disclosed is a process for preparing a polymer. The process includes at least one process stream and the process stream has at least one characteristic of interest. The process further includes...
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6860972 |
Process for detecting the location of a phase interface
Disclosed herein are processes for detecting the location of an interface between phases. In one embodiment, the process comprises: introducing a reaction mixture into a vessel wherein the reaction...
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6844411 |
Process for the preparation of isoolefin polymers with controlled free-radical curability
The present invention is relates to a process for the preparation of an isoolefin polymer containing repeating units derived from at least one isoolefin, at least one divinyl aromatic monomer and,...
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6759489 |
Fluidized bed methods for making polymers
The invention relates to continuous gas fluidized bed methods for making a polymer featuring a condensing agent in a recycle stream; and also to methods for monitoring and providing continuity in a...
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6753387 |
Temperature controlling system for olefin polymerization reactors
Methods for controlling the temperature of an olefin polymerization reactor (e.g., a polyethylene reactor) system are disclosed herein. The olefin polymerization reactor system includes a...
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6723805 |
Process for the controlled production of polyethylene and its copolymers
A process for producing high density polyethylene (HDPE) or linear low density polyethylene (LLDPE) in gas phase reactors, isolated or combined, using chromium or Ziegler-Natta catalysts, provided...
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6723804 |
Monitoring and control of slurry processes for polymerizing olefins
Processes, methods and apparatus relating to olefin polymerization include the use of Raman spectrometry to monitor the concentration of reactants, products or other chemical components. One or...
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6696544 |
Method for making polyamides
The invention concerns a method for making polyamide. More particularly, the invention concerns a method for making polyamides derived from the reaction between a diacid and a diamine. It concerns...
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6657019 |
Method and apparatus for predicting polymer latex properties in an emulsion polymerization process to improve the quality and productivity of the polymer latex
The present invention is a method for predicting polymer latex properties for an emulsion polymer latex based on statistical relationships between the polymer latex properties and process...
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6646096 |
Method for controlling the manufacture of polycarbonate and the polycarbonate formed thereby
A method for determining the endpoint of an interfacial reaction between a dihydroxy compound and a carbonyl halide comprises determining the characteristic end point of the reaction from a...
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6635710 |
Manufacturing method for polycarbonate
A method for manufacturing polycarbonate by melt-polycondensing bisphenol and carbonic acid diester uses as catalyst an alkali metal compound and/or alkaline earth metal compound (a). The catalyst...
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6590131 |
Method for control of a chemical manufacturing process
A method for monitoring and improving the performance of a chemical manufacturing process by monitoring transients associated with the operation of process equipment located dowstream of upstream...
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6586540 |
Method for producing an ethylene copolymer
The invention relates to a method for the production of copolymer based on ethylene by continuous copolymerization of ethylene and comonomer in a reactor in the presence of a catalyst. In this...
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6576719 |
Isobutene polymerization process
The present application relates to a process for the continuous polymerization of isobutene while maintaining at a constant desired value a property P (viscosity or average molecular mass) of the...
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6521805 |
Isobutene polymerization process
Isobutene polymerization process wherein a property P (viscosity or average molecular weight) of the polyisobutene product is maintained constant. The polymerization is conducted continuously in a...
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6498219 |
Method for continuously monitoring and controlling the monomer conversion during emulsion polymerization
A method of on-line monitoring and control of monomer conversion in emulsion polymerization includes continuously balancing, as from an initialization time, the heat Q IN , introduced into the...
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6479597 |
Raman analysis system for olefin polymerization control
Method of olefin polymerization in a reactor, such as a slurry loop olefin polymerization reactor, is provided. The method includes conducting in-situ, real time spectroscopic analysis of one or...
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6462149 |
Control of resin split in single-reactor manufacture of bimodal polyolefins
Bimodal resin products are produced in a single reactor by using two bicomponent catalyst compositions, each having a high molecular weight and a low molecular weight component, in different...
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6417295 |
Method and apparatus for detecting agglomerates
Agglomerates 20 in a mixed phase container 1 are detected by measuring strain in a detecting rod 50 disposed in the mixed phase container 1 in which a mixed phase of gas and powders is...
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6391985 |
High condensing mode polyolefin production under turbulent conditions in a fluidized bed
A fluidized bed olefin polymerization process is operated in the turbulent regime while utilizing greater than 17.5% liquid in the recycle fluid to remove the heat of reaction. The ratio of...
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6365681 |
Preventing upsets in polymerization reactors
In a polymerization reaction, an upset is anticipated and inhibited by monitoring at least one reaction condition and comparing it to the desired value or normal range for the condition as...
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6348635 |
Start-up polymerization process
A process for starting up a reaction for the polymerization of an olefin in the gas phase carried out using a catalyst based on chromium oxide in a fluidized bed reactor through which moves a...
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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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6274683 |
Test method for evaluating soluble polymer growth when recycling inhibitor streams
An improvement in a method for evaluating the efficiency of polymerization inhibitors is disclosed, wherein the improvement comprises: A) producing dissolved polymer in a solution comprising...
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6262190 |
Process and apparatus for fluid bed polymerization
In gas phase fluid bed polymerization processes, operation can be achieved over wider ranges of fluidizing gas velocities without incurring undue energy costs by adjusting the pressure drop through...
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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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6201102 |
Method of producing an aromatic polyester
A method of producing an aromatic polyester by distilling a low-boiling fraction from a polycondensation vessel containing a reaction product obtained by acetylating raw monomers of the aromatic...
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6153711 |
Rheology modification of precursor solutions
A method for tailoring the viscosity of a conjugated polymer precursor, the method comprising synthesizing the precursor by a polymerization reaction and, during the polymerization reaction,...
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6111034 |
Static control in olefin polymerization
Addition of water to a gas phase olefin polymerization reactor in amounts greater than 3 ppmv permits an increase in the level of condensable gas and facilitates operation of the reactor at an...
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6103855 |
Batch process for the production of polycarbonate by interfacial polymerization
A method of preparing a polycarbonate comprising the steps of: a) charging at least one dihydroxy compound, an inert solvent, water, caustic, carbonyl halide, and catalyst to a vessel, and...
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6042790 |
Apparatus for maintaining unreacted monomer concentration in a polymerization reactor
In a polymerization process utilizing a high pressure flash to separate polymer from unreacted monomer contained in the effluent stream from the reactor, the concentration of unreacted monomer in...
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6037184 |
Method and apparatus for taking sample
A method and apparatus for taking a sample from a flowing suspension formed by polymer particles and hydrocarbon diluent in a olefin polymerization process including at least one filter situated at...
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5994481 |
Polymerization method and polymerization apparatus
In a polymerization apparatus in which the power of a motor is transmitted to a stirrer via oil-lubricated transmission box and speed reduction gear, the temperature of the lubricating oil in the...
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5965674 |
Process for the production of polyolefins in an autoclave reactor
An improved process for the production of polyolefins in an autoclave reactor having several reaction zones operated at a pressure of 100 to 300 MPa and a temperature of 100 to 300° C. is...
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