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US20090292085 |
Polymerization processes for broadened molecular weight distribution
Provided are methods of producing polymers with broadened molecular weight and/or composition distribution in a continuous homogeneous polymerization system utilizing reactor temperature gradients,...
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US20090281255 |
CONTINUOUS PROCESS FOR THE PRODUCTION OF VINYL CHLORIDE (CO)POLYMERS
Polymerization process comprising the steps of: (a) reacting an aqueous suspension comprising initiator, vinyl chloride, and optionally one or more co-monomers in a continuous stirred tank reactor;...
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US20090221768 |
METHOD FOR THE ESTERIFICATION OF TEREPHTALIC ACID WITH BUTANEDIOL, METHOD FOR THE MANUFACTURE OF POLYBUTYLENE TEREPHTALATE AND A DEVICE THEREFOR
The present invention relates to an improved method for the esterification of terephthalic acid with 1,4-butanediol, an improved method for the manufacture of polybutylene terephtalate as well as...
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US20090215960 |
Thermoplastic Resin Having Uniform Composition and Narrow Molecular Weight Distribution, and Method for Preparing the Same
A method for preparing a thermoplastic resin is disclosed, which includes consecutively polymerizing a mixed raw material comprising a (meth)acrylic acid alkyl ester, an aromatic vinyl monomer and...
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US20090215970 |
Blow Molding Polyethylene Resins
Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising...
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US20090215971 |
METHOD FOR THE PRODUCTION OF POLYTETRAHYDROFURANE OR TETRAHYDROFURANE COPOLYMERS
The present invention relates to a process for preparing polytetrahydrofuran or tetrahydrofuran copolymers by polymerization of tetrahydrofuran in the presence of a telogen and/or a comonomer over...
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US20090209706 |
High Melt Flow Propylene Impact Copolymer and Method
The present disclosure provides a polymerization process for the production of a high melt flow propylene impact copolymer. The process includes contacting an active propylene-based polymer having...
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US20090182100 |
Process for the production of polyethylene resin
Process for the polymerization of ethylene to produce a polymer of enhanced long chain branching. Ethylene and hydrogen are introduced into a first reaction zone to produce an ethylene polymer...
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US20090163667 |
CATALYTIC OLEFIN BLOCK COPOLYMERS VIA POLYMERIZABLE SHUTTLING AGENT
A polymerization process and the resulting polymer composition, said process comprising polymerizing one or more addition polymerizable monomers and a polymerizable shuttling agent in the presence...
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US20090163679 |
Suspension polymerization process for manufacturing ultra high molecular weight polyethylene, a multimodal ultra high molecular weight polyethylene homopolymeric or copolymeric composition, a ultra high molecular weight polyethylene, and their uses
The present invention relates to a suspension polymerization process for the production of ultra high molecular weight polyethylene, wherein the operation is carried out in at least two reactors of...
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US20090156749 |
Polyethylene Blend Component and Blends Containing the Same
According to one aspect, the present invention relates to a low-density polyethylene having a melt index MFR 2 of 2.5 to 10.0 g/10 min, a density of 910 to 935 kg/m 3 , and a dynamic viscosity η...
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US20090156759 |
Industrial process for production of high-quality aromatic polycarbonate
It is an object of the present invention to provide a specific process that enables a high-quality high-performance aromatic polycarbonate having excellent mechanical properties and no...
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US20090149611 |
POWDER TRANSFER DEVICE AND POLYOLEFIN PRODUCTION PROCESS
The present invention provides a powder transfer device that has a simple construction, yet enables the powder discharge rate to be easily controlled, as well as a polyolefin powder production...
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US20090149610 |
OLEFIN POLYMERIZATION REACTOR, POLYOLEFIN PRODUCTION SYSTEM, AND POLYOLEFIN PRODUCTION PROCESS
An olefin polymerization reactor of the present invention includes a cylinder which extends vertically, and a decreasing diameter member which is formed on the cylinder, has an inside diameter that...
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US20090149620 |
SPOUTED BED DEVICE AND POLYOLEFIN PRODUCTION PROCESS USING THE SAME
A spouted bed device of the present invention includes a cylinder which extends vertically; a closing plate which closes a top end of the cylinder; a decreasing diameter member which is formed at a...
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US20090131611 |
SHORT-CHAIN BRANCHED POLYPROPYLENE
A short-chain-branched polypropylene having xylene solubles of at least 0.5 percent by weight is provided. In certain embodiments the polypropylene has a strain hardening index of at least 0.15 as...
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US20090131595 |
Polymer composition
A composition suitable for use in pressure pipes and pipe fittings is disclosed comprising polymer of ethylene and from 0.5 to 5 wt % of a C 4 -C 8 alpha-olefin which has a natural density of...
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US20090131610 |
Process for Production of Amphoteric Electrolyte Resin by Continuous Bulk Polymerization and Apparatus for the Production
A process for producing an amphoteric electrolyte resin by continuous bulk polymerization at low cost is provided. Also provided is an apparatus for achieving the process. The process comprises the...
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US20090093600 |
Methods for Making Polyester Resins in Falling Film Melt Polycondensation Reactors
The present invention relates to methods for forming polyester resins in one or more falling film reactors.
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US20090088538 |
Method of Producing Polycarbonate in a Flash Devolatilization System
The present invention provides a reactor system for producing polycarbonate. The reactor system has one or more reactant vessels, an oligomerization reactor, a first pressure control device, a...
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US20090076230 |
Process for preparing compositionally uniform copolymers
This invention relates to semi-batch type copolymerization processes. More specifically, the processes of the present invention are directed to the production of compositionally uniform copolymers,...
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US20090062485 |
Polymerisation process
A process for the polymerisation of olefins is disclosed wherein at least part of a stream, preferably a catalytically active stream, withdrawn from a polymerisation reactor is passed through a...
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US20090048406 |
PROCESS FOR PREPARING CONTINUOUSLY VARIABLE-COMPOSITION COPOLYMERS
A continuously variable composition copolymer is prepared in a reaction system, by (a) providing a reaction vessel comprising a first monomer composition; (b) providing a feed vessel comprising a...
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US20090036618 |
Multistage Process for Preparing Organopolysiloxanes Comprising Aminoalkyl Groups
Organopolysiloxanes having aminoalkyl groups are prepared by (i) reacting (A) linear, cyclic or branched organopolysiloxanes with (B) aminoalkyl silanes having an SiC-bonded hydrocarbon radical...
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US20090036617 |
Process for the Gas-Phase Polymerization of Olefins
A process for the gas-phase polymerization of α-olefÊns CH 2 ═CHR, where R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, carried out in a first and a second interconnected...
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US20090030098 |
Propylene Polymers Having Broad Molecular Weight Distribution
Propylene homopolymers or copolymers containing up to 5.0 wt % of alpha-olefin units having from 2 to 8 carbon atoms other than propylene, characterized in that said propylene homopolymers or...
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US20080306209 |
Production of a Water-Absorbing Resin to Which a Particulate Additive is Admixed
The invention relates to a process for producing a water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and, if appropriate, at least one...
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US20080300370 |
Preparation of polyethylene
A process for preparing a polyethylene in a multi-stage process is described. The process comprises pre-treating a Ziegler catalyst in a first stage in the presence of a 1-olefin/ethylene mixture...
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US20080275197 |
Bimodal Polyethylene Resins That Have High Stiffness and High ESCR
A bimodal polyethylene having a high density ranging from about 0.955 to about 0.959 g/cc, an improved environmental stress cracking resistance (ESCR) of from about 400 to about 2500 hours, and an...
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US20080269421 |
Polyethylene Composition Having a Broad Molecular Weight Distribution
An ethylene polymer composition having a density of 935 to 950 kg/m 3 , a dynamic Viscosity η 0.05 measured at a frequency of 0.05 rad/s of 2000 to 7000 Pa-s and a shear thinning index SHI 1/100 ...
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US20080269412 |
Catalytic Olefin Block Copolymers with Controlled Block Sequence Distribution
A process for the polymerization of one or more addition polymerizable monomers and the resulting polymer products, said process comprising: 1) contacting an addition polymerizable monomer or...
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US20080234445 |
Production Method of Aromatic Polycarbonate
The object of the present invention is to provide a production method of a high molecular weight aromatic polycarbonate containing a reduced amount of a high melting point product, and having less...
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US20080234443 |
Process for fluid phase in-line blending of polymers
A process for fluid phase in-line blending of polymers. The process includes providing two or more reactor trains configured in parallel and a separator for product blending and product-feed...
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US20080227932 |
Method for Producing Water-Absorbing Polymer Particles
A process for producing water-absorbing polymeric particles comprises conducting the polymerization in at least two parallel continuous polymerization reactors under substantially identical...
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US20080214746 |
PROCESS FOR PRODUCING ETHYLENE-ALPHA-OLEFIN COPOLYMER
Disclosed is a process for producing an ethylene-α-olefin copolymer excellent in balancing between strength and elongation by continuous multi-step polymerization. The process comprises...
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US20080214745 |
Polymerisation Process
A process for the polymerisation of olefins is disclosed wherein at least part of a stream, preferably a catalytically active stream, withdrawn from a polymerisation reactor is passed through a...
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US20080207852 |
PROCESS FOR PRODUCING ETHYLENE -ALPHA- OLEFIN COPOLYMER
The object of the present invention is to provide a process for producing an ethylene-α-olefin copolymer by continuous multistage polymerization which can give an ethylene-α-olefin copolymer...
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US20080188586 |
Production of Water-Absorbing Polymeric Particles by Dropletization Polymerization in the Gas Phase
A process for producing water-absorbing polymeric particles by dropletization polymerization in the gas phase, which comprises drying the polymeric particles after the polymerization in a fluidized...
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US20080182947 |
PROCESS FOR PRODUCING ETHYLENE -ALPHA- OLEFIN-POLYENE COPOLYMER
The object of the present invention is to provide a process for producing an ethylene-α-olefin-polyene copolymer by continuous multistage polymerization which can give an...
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US20080171816 |
Low-Viscosity Uretdion Group-Containing Polyaddition Compounds, Method Of Production And Use Thereof
The invention relates to low-viscosity polyaddition compounds containing uretdione groups, preparation process, and use.
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US20080153997 |
Polymer production at supercritical conditions
This invention relates to a process to polymerize olefins comprising contacting, at a temperature of 60° C. or more and a pressure of at least 15 MPa, one or more olefin monomers having three or...
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US20080132657 |
METHOD FOR PREPARING AN ETHYLENE-SILANE COPOLYMER
The present invention relates to an improved method for preparing an ethylene-silane copolymer comprising hydrolysable silane groups by radical-initiated polymerisation of ethylene and an...
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US20080119624 |
Loop Reactor With Varying Diameter For Olefin Polymerization
Process for polymerizing at least one olefinic monomer selected from ethylene, propylene and 1-butene in a loop reactor in the presence of a polymerization catalyst at from 20 to 150° C., but...
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US20080093104 |
Cable with Thermoplastic Insulation
Insulation layer for cables comprising a heterophasic polymer composition having superior mechanical and electrical properties and being environmentally friendly. The heterophasic polymer...
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US20080090975 |
Method And Apparatus For Producing Polycondensation Polymer And Molded Article Thereof
A method for producing a polycondensation polymer, which comprises: introducing a prepolymer of a polycondensation polymer into a polymerization reactor through a feed opening in a molten state;...
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US20080058484 |
Method for Controlling the Polymer Flow in a Polymerization Process
A method for controlling the flowability of polymer particles flowing downward in a densified form inside a polymerization reactor, in which one or more monomers are gas-phase polymerized in the...
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US20080051527 |
Method and Device for Continuously Producing Copolyamides with Melting Points Gr Eater Than 265 C
The invention relates to a method for continuously producing copolyamides with melting points greater than approximately 265° C. According to the invention, in a continuous process, partially...
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US20080050588 |
Semiconductive Polymer Composition
The invention relates to a semiconductive polymer composition for use in power cables. The composition comprises a multimodal ethylene homo- or copolymer produced in a polymerisation process...
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US20080051528 |
Multistage Process for Producing Ethylene Polymer Compositions
The present invention relates to a process of producing an ethylene polymer composition in multiple stages of which the first stage is a slurry polymerization stage, in the presence of a catalyst...
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US20080045675 |
Reactor Systems and Polymerization Processes Using Multi-Zone Circulating Reactors
The invention relates to the production of polymers using polymerization processes and reactor systems including a plurality of multi-zone circulating reactors. In particular, the invention relates...
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