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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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6359084 |
Gas phase polymerization process
A process for the gas phase polymerization of one or more alpha-olefins conducted in the presence of a catalyst in a reactor having a fluidized bed, in which process, one or more zones having a...
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6339133 |
Emergency stop of a polymerization in the gas phase
Process for the emergency stopping of a polymerization reaction in the gas phase, comprising the injection of a poison of the reaction into a polymerization reactor and the evacuation of the...
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6294623 |
Production of spherical polymers
The process for producing bead polymers having a mean particle size of 0.5 to 50 μm and a narrow particle size distribution by polymerisation of monomers dissolved in a solvent that constitutes a...
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6291620 |
Polymer synthesis
Process for the synthesis of block polymers, homopolymers and copolymers of narrow polydispersity having formula (1) by contacting selected vinyl monomer(s), vinyl-terminated compound(s) and free...
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6239199 |
Resin composition resin molding and method for inhibiting polymerization of vinyl compound
Disclosed are a resin composition for inhibiting polymerization of a vinyl compound, which includes a resin and 0.1 to 30% by weight based on the resin, of a polymerization inhibitor for the vinyl...
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6180729 |
Continuous gas-phase polymerization process
In a continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or a mixture of ethylene or propene and C 3 -C 8 ...
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6180730 |
Catalyst deactivation
A particulate deactivator is used to pacify halogen-containing catalyst residues from a medium pressure solution polymerization process. The deactivator is added post-reactor preferably in the form...
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6124396 |
Branched water-soluble acrylamide copolymers of high molecular weight and process for manufacturing them
This invention concerns comb-like branched, water-soluble cationic acrylamide copolymers, prepared from 1-40 mole % of a water-soluble cationic prepolymer backbone of formula I --[A--B--NR] n --...
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6117276 |
Inhibiting polymerization of vinyl aromatic monomers
When a nitroxyl compound is heated in an oxygen-free atmosphere with a vinyl aromatic monomer at 50-140° C. for up to 60 days, it forms an activated inhibitor mixture which is superior to the...
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6103789 |
Hydrosoluble acrylic copolymers
Acrylic copolymers containing the following repeating units: ##STR1## wherein R A , R B , R C , R I , R II , equal or different, are H or CH 3 ; M + is H or a cation belonging to group IA, IIA,...
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6077919 |
Silyl-terminated polymer and method for preparing silyl-terminated polyolefins
There is disclosed a method for synthesizing polyolefins having a silyl group at one terminus, the method comprising reacting a monomer of an a-olefin (C≤3≤10) and a tetrasubstituted silyl...
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6013741 |
Method of terminating gas phase polymerization of olefin, method of initiating the polymerization and apparatus therefor
A method of terminating a gas phase polymerization of an olefin to be conducted subsequent to producing a polyolefin by feeding a gaseous olefin into a fluidized bed reactor to polymerize the...
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5965675 |
Polymerization processes
A polymerization process is provided comprising contacting under polymerization conditions a catalyst, a taming agent, ethylene and optionally a comonomer, wherein the catalyst comprises chromium...
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5955553 |
Molecular weight regulation of cis-1,4-polybutadiene using carboxylates
There is disclosed a process for the regulation of the molecular weight of high cis polybutadiene prepared by polymerizing butadiene under solution polymerization conditions employing as the...
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5880230 |
Shortstop agents for vinyl polymerizations
The present invention relates to a method of terminating a free-radical initiated emulsion polymerization by utilizing a shortstopping agent that contains a stable nitroxyl free-radical or is...
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5844056 |
Star polymers having multiple polyisobutylene arms emanating from a calixarene core, initiators therefor, and method for the synthesis thereof
The synthesis and characterization of novel linear polymers and multi-arm star polymers comprising polyisobutylene arms connected to a well-defined calixarene core are described. The polymers are...
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5844054 |
Process control in the presence of chromium based catalysts
A continuous process for the polymerization of one or more alpha-olefins in the gas phase in the presence of a chromium based catalyst, under polymerization conditions including the reaction...
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5804678 |
Process for gas phase polymerization of olefin
In a gas phase olefin polymerization, an olefin is continuously fed to a fluid bed reactor in which a metallocene catalyst is present. At least one compound selected from water, alcohols and...
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5773543 |
Allylic chain transfer agents
A process for the free radical initiated polymerization of unsaturated species characterized by the use of compound of Formula (I) as chain transfer agents: ##STR1## wherein: X is selected from...
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5753786 |
Process for transitioning between incompatible polymerization catalysts
This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin...
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5731381 |
Termination of gas phase polymerizations of conjugated dienes, vinyl-substituted aromatic compounds and mixtures thereof
There is provided a method for terminating a gas phase polymerization of a compound selected from the group consisting of a conjugated diene, a vinyl-substituted aromatic compound, and mixtures...
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5700888 |
Synthesis of macrocyclic polymers having low hysteresis compounded properties
The present invention provides a method of anionic synthesis of stable macrocyclic polymers that are compounded to form vulcanizable elastomeric compounds exhibiting reduced hysteresis properties....
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5700887 |
Preparation of branched polymers from vinyl aromatic monomer
A process for producing a branched polymer from a vinyl aromatic monomer comprising: A) contacting a vinyl aromatic monomer with a difunctional anionic initiator under conditions such that a...
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5677399 |
Synthesis of macrocyclic polymers with group IIA and IIB metal cyclic organometallic initiators
The invention is a practical process for anionically synthesizing commercially significant quantities of macrocyclic polymers from polar and/or non-polar monomers by using Group IIA and IIB metal...
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5672666 |
Process for transitioning between incompatible polymerization catalysts
This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for...
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5631336 |
Chain-terminated N-vinyl lactam polymers and graft-copolymers and methods for making same
A water-soluble polyvinyl 5-membered lactam having a molecular weight ranging from about 1000 to about 20,000 and chain-terminated with a compound selected from the group consisting of compounds of...
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5578690 |
Silyl-terminated interpolymer of ethylene and method for preparing silyl-terminated polyolefins
There is disclosed a method for synthesizing polyolefins having a silyl group at one terminus, said method comprising reacting (A) a monomer selected from the group consisting of ethylene and a...
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5548043 |
Processes for producing bimodal toner resins
A one-step polymerization process for producing a bimodal resin having a distinct low molecular weight portion and a high molecular weight portion includes initiating an anionic polymerization of a...
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5548042 |
Process for the production of polypropylene
A process comprising contacting propylene in two reaction zones connected in series, under gas phase polymerization conditions, with a transition metal catalyst system comprising (a) introducing...
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5543478 |
Method for operating reactor for polymerizing olefins
In the preparation of polyolefin in a vapor phase polymerization using catalysts comprising a solid catalyst component containing titanium and/or vanadium; and magnesium and an organoaluminum...
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5461124 |
Reactive systems and/or polymer composition for tissue contact with the living body
Described is the use of physiologically compatible tocopherols and especially of vitamin E as an inhibitor against premature polymerization initiation in reactive systems capable of undergoing a...
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5444140 |
Starve fed emulsion polymerization process
Simultaneous control of the molecular weight and the molecular weight distribution in the production of toner resins can be accomplished by using a starve fed emulsion polymerization process, which...
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5432242 |
HP catalyst killer
A process for preparing olefinic polymers by metallocene catalyzed olefin polymerisation in which at least one volatile catalyst kill agent is introduced. A non-volatile catalyst kill agent may...
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5414063 |
Process for the production of polypropylene
A process control scheme for temporarily slowing or killing the production of polypropylene while idling the reactor using a fourth generation catalyst system containing a solid magnesium chloride...
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5391665 |
Process for producing polymer having hydroxyl groups at both terminals
There are provided a process for obtaining a polymer having hydroxyl groups at both terminals easily and with cheap cost and excellent efficiency from a wide variety of vinyl-based compounds, a...
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5384372 |
Shortstopping of free radical polymerizations
The present invention relates to a method of terminating a free radical initiated emulsion polymerization by using a shortstopping agent selected from the group consisting of isopropylhydroxylamine...
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5336738 |
Kill-gas introduction to a fluidized bed reactor containing chromium oxide catalyst
The present invention relates to a process for stopping an olefin polymerization which is carried out in a low pressure gas phase reactor, which process comprises introducing an effective quantity...
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5216065 |
Emulsion polymerization with large particle size
A process for emulsion polymerization to form a latex having a particle size greater than about 0.5 micrometers by charging to a reaction vessel under agitation a reaction mixture including water,...
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5214094 |
Method of preparing pressure sensitive adhesives having interpolymers with internal crosslinking monomers
Novel adhesive products are prepared by coating a novel adhesive formulation onto appropriate substrates. The adhesive formulation is capable of maintaining coatable viscosity at solids levels in...
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5200502 |
Deactivator reagent for olefin polymerization catalysts
A method is disclosed for controlling the activity of or deactivating a transition element olefin polymerization catalyst by contacting the catalyst with a 1,2-diether organic compound.
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5194486 |
Adhesive
Novel adhesive products are prepared by coating a novel adhesive formulation onto appropriate substrates. The adhesive formulation is capable of maintaining coatable viscosity at solids levels in...
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5194525 |
Continuous mass polymerization process for making styrene copolymers
A process for producing a styrenic copolymer for injection molding or extrusion molding by continuous mass polymerization of a styrenic monomer with a polymerizable unsaturated fatty acid,...
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5159032 |
Process for terminating the polymerization of vinyl chloride with an aqueous dispersion of an antioxidant containing a polyoxyalkylene oxide
A process for preparing a vinyl chloride polymer, which comprises polymerizing vinyl chloride or a monomeric mixture composed mainly of vinyl chloride in an aqueous medium, wherein the...
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5066736 |
Gas-phase alpha-olefin polymerization process in the presence of an activity retarder
A process for the continuous polymerization of one or more alpha-olefins with a transition metal catalyst, in a reactor having a fluidized and/or mechanically stirred bed, in which a very small...
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5059661 |
Phenolic compounds as chain-terminators for the anionic solution polymerization of dienes
Compounds of formula I ##STR1## wherein n is 0 to 3, R 1 and R 2 are C 1 -C 12 alkyl, C 5 -C 8 cycloalkyl or --CH 2 SR 3 , R 3 is C 1 -C 18 alkyl, phenyl or benzyl, and R 4 is hydrogen...
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5045611 |
Processes for the preparation of polymers
A process for the preparation of polymers which comprises forming an aqueous phase comprised of water and a surfactant; adding to the aqueous phase monomers; subsequently initiating polymerization...
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4985513 |
Conjugated diene copolymer, process for producing the same, and photosensitive resin composition comprising the same
A conjugated diene copolymer comprising (A) 40 to 90 mole % of a conjugated diene component, (B) 0.5 to 10 mole % of an alpha,beta-ethylenically unsaturated carboxylic acid component, (C) 0.1 to 5...
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4965326 |
Process for deactivating polymerization-inducing radicals
Process for inhibiting and for stopping radical induced polymerizations which employs an aromatic hydroxy dithiocarboxylic acid or salt thereof as stopping agent for deactivating radicals, thereby...
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4950723 |
Organic acid halide neutrallizing agents for anionic polymerizations
A process for neutralizing the terminated remnant of an alkali metal anionic polymerization initiator comprising contacting the remnant with an organic acid halide.
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