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4883847 |
Process to terminate an olefin polymerization reaction
A method is disclosed for terminating a polymerization reaction of reactive olefins and a Lewis acid catalyst wherein the reaction is killed almost instantaneously to prevent an explosion. The...
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4868258 |
Vinyl chloride latex polymers with diter-butyl-p-cresol as polymerization aid
The improvement in a process for the preparation of latexes of homo- and co-polymers of vinyl chloride, with particles having a mean diameter between 0.2 and 0.8 μm and containing at least one...
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4786695 |
Method and reactor system for rapid kill gas injection to gas phase polymerization reactors
There is provided an improvement in a method for terminating a gas phase olefin polymerization reaction with a kill gas such as carbon monoxide or carbon dioxide. The improvement involves the use...
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4777229 |
Reduction of isomerization in solution process for polymerization of alpha-olefins
A solution polymerization process for the preparation of high molecular weight polymers selected from the group consisting of homopolymers of ethylene and copolymers of ethylene and butene-1 is...
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4769428 |
Solution process for the preparation of polymers of alpha-olefins
A solution process, and a catalyst therefor, for the preparation of high molecular weight polymers of alph-olefins viz. homopolymers of ethylene and copolymers of ethylene and C 3 -C 12 ...
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4758644 |
Bromostyrene composition
A bromostyrene composition having overcome the unstability of bromostyrenes and being stable at the time of its storage and transportation is provided, which composition comprises 100 parts by...
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4755572 |
Process for the manufacture of homopolymers or copolymers of ethylene
A process for the continuous manufacture of homopolymers of an ethylene monomer and copolymers of an ethylene monomer with at least one α-olefin containing 3 to 8 carbon atoms. The monomers and a...
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4749757 |
High bulk density PVC resin suspension polymerization with inhibitor
A suspending agent system, a polymerizable reaction mixture, and a polymerization reaction process for producing high bulk density resin on a consistent basis by incorporating in the reaction...
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4748218 |
Shortstopping free radical polymerization of olefinic monomers
It has been found that substituted hydroquinones function as a shortstop agent in the polymerization of vinyl monomers. The substituted hydroquinones have the formula: ##STR1## wherein ##STR2##...
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4746700 |
Process for preparing vinyl alcohol copolymer
A process for preparing a vinyl alcohol copolymer, which comprises adding at least one specific olefin derivative containing phenyl group to a solution of vinyl ester copolymer when the...
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4737554 |
Method for the termination of living polymers, and compounds suitable for the purpose
Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by anionic polymerization of diene and/or vinylaromatic monomers.
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4717755 |
Process for producing propylene polymer
A process for producing a propylene polymer having a carbonyl group at the terminal, said process comprising polymerizing propylene to give a living propylene polymer in the presence of a catalyst...
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4713421 |
Process for obtaining narrow molecular weight distribution in vinyl aromatic mass polymerization system
In a process for the mass polymerization of vinyl aromatic monomer wherein vinyl aromatic monomer is polymerized in successive stages of increasing temperature, the improvement which narrows the...
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4654392 |
BHA in vinyl chloride polymerization
There is disclosed, in a microsuspension polymerization process for producing homopolymers and copolymers of vinyl chloride, having a dispersion step and a seed polymerization step, the improvement...
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4650841 |
Continuous process for the manufacture of ethylene homopolymers or ethylene copolymers
The process, which comprises a first stage for (co)polymerizing ethylene at 180°-320° C. and 300-2,500 bars in the presence of a Ziegler type catalytic system, a second stage for separation, a...
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4634744 |
Method of catalyst deactivation
An improved method of terminating ethylene polymerization and interpolymerization reactions by deactivating the Ziegler-type catalyst used in the reaction comprises the step of injecting a selected...
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4619978 |
Substituted phenol chain terminator for polyvinyl chloride polymerization
An improved process for terminating the suspension polymerization reaction of vinyl chloride monomer into polyvinyl chloride which comprises adding hindered phenols of the structure presented...
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4590301 |
Polymerization inhibitors
Compounds of the general formula ##STR1## wherein n, R 1 , R 2 and X are defined herein, are effective inhibitors of polymerization of vinylic monomers, particularly acrylic monomers. The...
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4585844 |
Process for preparing acid dyeable acrylonitrile polymer having improved whiteness
Acrylonitrile copolymers containing basic comonomers have improved color and color stability when the polymerization is carried out using a catalyst selected from the group consisting of hydrogen...
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4551509 |
Process for manufacturing homopolymers and copolymers of ethylene
A process for producing ethylene polymers or ethylene copolymers comprising the steps of: (a) continuously polymerizing ethylene or ethylene and an α-olefin in a reaction mixture at a pressure of...
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4547555 |
Method for rapid kill gas injection to gas phase polymerization reactors during power failures
There is provided a method for terminating a gas phase olefin polymerization reaction with a kill gas such as carbon monoxide or carbon dioxide. The method involves the use of coast-down flow of...
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4538013 |
Process for producing Diels-Alder adducts while inhibiting the formation of polymeric by-products
A process for preventing the formation of polymeric by-products during the production of Diels-Alder adducts is improved by the addition of NO or of a compound splitting off NO in situ, as a...
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4525546 |
Process for producing polyethylene and an ethylene-α-olefin copolymer
Polyethylene and an ethylene-α-olefin copolymer are produced by polymerizing ethylene or a mixture of ethylene with an α-olefin having 3 to 18 carbon atoms by use of a coordination polymerization...
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4524194 |
Process for the polymerization of vinylidene fluoride, in an aqueous suspending medium, in the presence of bis(alkyl) carbonate chain regulators
Process for the polymerization, in an aqueous suspending medium, of vinylidene fluoride with the aid of an oil-soluble free radical polymerization initiator in the presence of a suspending agent...
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4524197 |
Process for making vinylidene fluoride containing fluoroelastomers
Making a fluoroelastomer by feeding to an aqueous polymerization medium in a reactor about 25-75% by weight of the total monomers, vinylidene fluoride, at least one other fluorine-containing...
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4504615 |
Treating polymers of ethylene
A method for treating polymers of ethylene which have been stabilized with hindered phenolic stabilizer to reduce the discoloration produced upon processing the stabilized polymer at elevated...
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4482684 |
Process for polymerization of vinyl monomers with improved kinetic rate profile
This invention relates to the use of an organic compound which is a polymerization inhibitor in aqueous suspension polymerization systems for making polymers from olefinic monomers. The inhibitor...
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4478986 |
Tri-N-substituted-s-triazine-trione chain terminator for polyvinyl chloride polymerization
An improved process for terminating the suspension polymerization reaction of vinyl chloride monomer into polyvinyl chloride which comprises adding hindered phenols of the structure presented...
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4477638 |
Hindered phenolic esters of oligomeric glycols as chain terminators for polyvinyl chloride polymerization
An improved process for terminating the suspension polymerization reaction of vinyl chloride monomer into polyvinyl chloride which comprises adding hindered phenols of the structure presented...
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4468343 |
Polymerization co-inhibitors for vinyl aromatic compounds
A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The composition includes effective amounts of...
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4466905 |
Polymerization inhibition process for vinyl aromatic compounds
A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The composition includes effective amounts of...
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4466904 |
Polymerization co-inhibitors for vinyl aromatic compounds
A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The compound includes effective amounts of...
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4465888 |
Oligomerization of olefins in supercritical water
Fuel range liquid hydrocarbons are produced by the oligomerization of olefins in a process comprising contacting the olefins containing 5 or less carbon atoms with a water containing medium at a...
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4460755 |
Direct conversion of a polymerization reaction catalyzed by a Ziegler-type catalyst into one catalyzed by a chromium-based catalyst
A method of converting a continuous olefin polymerization reaction catalyzed by a Ziegler-type catalyst into one catalyzed by a chromium-based catalyst, without the need of emptying and recharging...
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4430488 |
Deactivation of catalyst in solution process for polymerization of α- o
The present invention relates to a solution polymerization process for the preparation of high molecular weight polymers of α-olefins selected from the group consisting of homopolymers of ethylene...
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4405742 |
Process for the production of high molecular weight polychloroprene and its use as a starting material for adhesives
By adding substances corresponding to the following general formula I ##STR1## in which X=O, S or N--R 5 ; R 1 =hydrogen, C 1 -C 19 -alkyl, C 2 -C 19 -alkenyl, phenyl, C 1 -C 4 -alkylene...
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4401798 |
Process for the production of vinyl halide polymers that uses an alkyl-substituted trisphenol as the chain-terminating agent
The polymerization of a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical generating polymerization initiator is terminated by introducing into...
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4388448 |
Glycidyl methacrylate polymers, their preparation and solvolysis products
Homopolymers of glycidyl methacrylate (GMA) and copolymers of GMA with other methacrylate comonomers; their preparation employing an anionic initiator which is the adduct of a selected...
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4384089 |
Low temperature polymerization process
The hydrocarbon fluid friction reducing properties of copolymers of two or more alpha-monoolefins having 4 to 20 carbon atoms is improved by copolymerizing the monomers in the liquid state by means...
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4363900 |
Process for preparing polytetrafluoroethylene fine powder
A process for preparing polytetrafluoroethylene fine powder by polymerization of tetrafluoroethylene in an aqueous medium comprising a water-soluble polymerization initiator and a non-telogenic...
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4361683 |
Termination of vinyl halide polymerization
An improvement in the method of terminating the preparation of vinyl halide-containing polymers is disclosed. The improvement comprises injecting into the polymerization reactor at the desired...
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4346202 |
Shortstopping free radical polymerization of olefinic monomers
The present invention relates to the polymerization of vinyl monomers either alone or copolymerized with ethylenically unsaturated polymerizable monomers having a terminal CH 2 C< grouping...
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4326048 |
Method for emergency shutdown of gas phase polyolefin reactor
In a gas phase olefin polymerization using a transition metal compound/aluminum alkyl catalyst system, polymerization can be terminated rapidly by injecting an amount of carbon oxide and then...
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4324874 |
Production of vinyl halide polymers with dialkyl, hydroxy phenyl alkanoic ester of polyhydric alcohols
The polymerization of a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical generating polymerization initiator is terminated by introducing into...
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4321171 |
Polymerization process short stopped with undisproportionated rosin acid
Method and composite of forming an elastomer product which comprises (A) solvent solution polymerizing an olefin monomer in the presence of an organometallic catalyst, (B) shortstopping the...
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4306044 |
Control of olefin polymerization
A gas-phase olefin polymerization system is provided with means for sensing a potentially dangerous condition and means for introducing carbon dioxide into the system to at least reduce the rate of...
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4283514 |
Chemicals for termination of polyvinylchloride polymerizations
Butylation of a mixture of xylenols and trimethylphenols gives a product which is suitable for use as a stabilizer for polyvinyl chloride. The material can be added to the reactor during...
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4280006 |
Process for the production of polyisocyanate silicate plastics utilizing an alkali metal cellulose silicate condensation product
This invention relates to a process for preparing polyisocyanate silicate plastics by reaction of an alkali metal cellulose silicate condensation product with a compound having at least two...
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4242477 |
Ascorbate short-stops
The polymerization of butadiene and styrene in an emulsion, free-radical polymerization process using a persulphate initiator is effectively short-stopped by the addition of ascorbic acid or the...
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4234716 |
Process for the separation of polyolefins manufactured at low pressure
A process for the separation of polyolefins manufactured at low pressure with the aid of catalysts. Carbon monoxide is added to the reaction mixture resulting from the polymerization. The process...
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