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4208314 |
Polymer/polyols and process for production thereof
This invention relates to a novel process for producing polymer/polyols characterized by the use of specific amounts of particular monomer combinations and by maintaining a low monomer...
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4200715 |
Vapor phase processes for the polymerization of olefins
A process is provided for the polymerization of an olefin such as ethylene in the vapor phase in a moving bed of particles of the polymerized olefin in which novel means are employed to feed the...
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4200713 |
Process for the anionic homo- or co-polymerization of aromatic vinyl compounds
This invention relates to a process for producing a homopolymer or co-polymer of an aromatic vinyl monomer by anionically polymerizing a monomer mixture in the absence of oxygen in a tubular coil...
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4192784 |
Hydrophilic copolymers, their preparation and their use in separation techniques
Water-insoluble, tridimensional cross-linked random copolymers, which contain in copolymerized form: (a) 25% to 98% by weight of N-[tris(hydroxymethyl)methyl]acrylamide or...
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4188470 |
Process for polymerizing ethylene in a gaseous phase
Ethylene is polymerized in a gaseous phase and in contact with a Ziegler/Natta type solid catalyst capable of producing polyethylene in the form of granules having an easily controllable and...
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4182814 |
Process for the production of polybutadiene having a high cis-1,4-content
A process for the production of polybutadiene having a high cis-1,4-content by the polymerization of 1,3-butadiene in an aliphatic solvent in the presence of a catalyst consisting essentially of ...
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4178221 |
Process for the preparation of water-soluble acrylic polymers by photopolymerization
Water-soluble acrylic polymers are prepared by a sequential photopolymerization process. A monomer solution is deposited on a support which is subsequently irradiated to effect polymerization....
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4175169 |
Production of polyethylene
Polyethylene is produced by polymerization of ethylene alone or with comonomers or telogens (modifiers) in an elongated tubular reactor having an inlet and outlet and at least one reaction zone and...
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RE30148 |
Melt finishing process for polymers produced by vapor state polymerization processes
A melt finish process is disclosed herein for working up solid, particulate polymer from a vapor state polymerization reactor, which reactor employs high yield catalysts, whereby the polymer is...
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4168355 |
Process for producing ethylene polymers in tubular reactor
A continuous process for producing polyethylene or copolymers of ethylene with other copolymerizable compounds at a pressure of at least 1,000 kg/cm 2 in a tubular reactor under steady conditions...
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4163090 |
Process for preparing normally crystalline vinylidene halide polymers having superior flow properties employing a combination of colloidal silica and non-ionic water soluble cellulose ether having a viscosity of about 5 cp or less as stabilizing agents
Normally crystalline vinylidene halide polymers are prepared by an improved limited coalescence suspension polymerization reaction wherein colloidal silica is used as a solid particle emulsifier,...
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4161468 |
Process for the preparation of graft polymer dispersions employing liquid free radical catalysts
Graft polymer dispersions are prepared by the in situ polymerization in the presence of a free radical catalyst of an ethylenically unsaturated monomer or mixture of monomers in a liquid polyol...
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4158571 |
Novel bingham fluids
Bingham fluid compositions are provided which contain a functional material such as a polymerization initiator dispersed in a solid continuous phase, which is a mixture of a wax and a liquid...
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4152501 |
Avoidance of vinyl chloride emissions in batch suspension polymerizations
The necessity of opening a large polymerization reactor, in order to introduce a polymerization catalyst between charges in the batch suspension of polymerization of vinyl chloride on a commercial...
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4147853 |
Internally plasticized vinyl chloride copolymer
An internally plasticized copolymer of from about 50% to about 85%, by weight, vinyl chloride, from about 3% to about 47%, by weight, of a C 6 -C 10 alkyl acrylate, and from about 3% to about...
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4136242 |
Method for suspension-polymerizing vinyl chloride
A polymerization vessel equipped with a condenser is charged with vinyl chloride, a suspending agent or dispersing agent, and water. The mixture is subjected to a preparatory stirring in the...
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4135044 |
Process for achieving high conversions in the production of polyethylene
Polyethylene is produced by polymerization of ethylene alone or with comonomers and/or telogens (modifiers) in an elongated tubular reactor having an inlet and outlet and preferably containing four...
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4135043 |
Process for preparing polymers in powder form
Polymers in powder form are manufactured by polymerizing water-soluble ethylenically unsaturated monomers, which form hydrophilic polymers, in a powder bed of polymers of water-soluble...
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4130699 |
Vapor phase polymerization with temporarily inactive titanium catalyst
Vapor phase polymerization of an olefin which comprises conveying inactive high yield titanium catalyst component to a vapor phase polymerization reactor with a liquid comprising recycled quench...
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4125574 |
Process and apparatus for the continuous production of vinyl chloride polymers in aqueous emulsion
A continuous process and an apparatus for the polymerization of vinyl chloride in aqueous emulsion wherein the liquid reaction mixture is fed into the lower part of a vertical, cylindrical vessel,...
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4125697 |
Process for the production of polychloroprene
Object of the invention is a process for polymerizing chloroprene in aqueous emulsion in a certain apparatus which prevents formation of deposits and so-called "popcorn" polymers.
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4123403 |
Continuous process for preparing aqueous polymer microsuspensions
Aqueous polymer microsuspensions having controlled particle size and narrow particle size distribution are prepared by a continuous process comprising the steps of (a) forming a heterogeneous...
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4112211 |
Process for the manufacture of homo- and copolymers of tetrafluoroethylene employing as the reducing agent in the redox catalyst an ayodicarboxylic acid, salt of ayocarboxylic acid, azodicarbonamide, or mixtures thereof
Polymers on the basis of tetrafluoroethylene are produced in the presence of a redox system as catalyst consisting of a usual peroxidic compound as oxidizing component and a water-soluble nitrogen...
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4110521 |
Continuous polymerization apparatus and process
An apparatus and process for the production of polymers which utilizes a tubular reactor which contains static mixers.
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4109069 |
Horizontal autoclave for the bulk preparation of polymers and copolymers on a basis of vinyl chloride
A horizontal autoclave for the bulk preparation of polymers and copolymers on a basis of vinyl chloride. It is equipped with a stirrer system of the frame type comprising one or more coaxial...
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4107410 |
Polymerization column and method of polymerizing vinylidene compounds
A method of polymerizing and a polymerization column for a monomeric vinylidene compound in which heat exchange tubes are spaced relatively along a polymerization chamber, each tube lying in a...
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4107409 |
Method of producing polymers of high molecular weight by the two-phase interfacial method
A process for producing high molecular weight polymers by the two-phase interfacial method comprising bringing two liquid phases containing polymerizable reactants continuously into contact with...
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4104457 |
Bulk polymerization of vinyl chloride to control grain size
Polymers and copolymers of vinyl chloride having a narrow grain size distribution and a large average mean diameter and a process for the preparation of same in which the polymerization of vinyl...
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4098974 |
Polyalkenes of wide molecular weight distribution
A two-stage cyclical process for producing alkene polymers of wide molecular weight distribution, in which high molecular weight polyalkenes are produced in one stage and lower molecular weight...
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4098977 |
Method for preparing polymers from water soluble vinyl monomers
A concentrated solution of a water-soluble vinyl monomer is mixed at or below room temperature with an effective amount of a peroxygen catalyst and the resulting solution is freed of inhibitory...
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4096320 |
Process for the preparation of butyl rubber
Butyl rubber is prepared by polymerizing isobutylene and a conjugated diolefin in a liquid reaction medium wherein the temperature is controlled by indirect heat-exchange with boiling ethylene...
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4088625 |
Process for the production of a pulverulent, tricklable mixture of ethylene/vinyl acetate copolymer and powdery polyvinylchloride
A process for the production of a pulverulent, tricklable mixture of ethylene/vinyl acetate copolymer and polyvinylchloride comprising the steps of mixing a mixture consisting essentially of (a) an...
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4087600 |
Polymers of tetrachloroethyl esters of unsaturated organic acids, and the method for their preparation
The invention relates to tetrachloroethyl esters of unsaturated organic acids of the general formula I ##STR1## where X stands for a substituent selected from the group consisting of COOH, CCOCH 3...
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4085266 |
Process for the high pressure production of polyethylene
In a process for polymerizing ethylene in a two-zone autoclave reactor comprising a top reaction zone and a bottom reaction zone which process comprises polymerizing ethylene in said top reaction...
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4076920 |
Process for producing homo- or copolymerization of vinyl or vinylidene halides having reduced polymer build-up in the reactor
There is disclosed a process for preparing vinyl dispersion resins by conducting the polymerization reaction of the vinyl monomer or monomers in an aqueous alkaline medium, using an oil-soluble...
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4071325 |
Ethylene polymerization reactor
A reactor including a horizontally disposed, elongated motor housing and at least a pair of mating reactor body sections, end heads for sealing the outer ends of the reactor and closure straps...
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4071670 |
Method of sizing monomer droplets for suspension polymerization to form small particles
A method of forming particles of between about 5 and about 50 microns utilizing a two stage process wherein monomer possibly containing pigments, dyes and/or fillers such as silicon and magnetite,...
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4071675 |
Emulsion polymerization of vinyl chloride using mixed emulsifier system in a single step in the absence of seed formation
A one-step process for the emulsion polymerization of vinyl chloride using a water-soluble initiator and an aqueous emulsifier system of (1) a C 12 -C 18 straight chain alkyl or alkenyl phosphate...
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4060677 |
Process for molecular weight lowering of vinyl halide polymers employing saturated carbon to carbon bonded aldehydes
Vinyl halide homopolymers, copolymers and graft polymers of substantially lower molecular weight are obtained when polymerization is carried out in bulk in the presence of a small concentration in...
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4058495 |
Preparation of high bulk density/low porosity PVC resins
A high bulk density/low porosity polyvinyl chloride resin which is highly processable and thermally stable is prepared by suspension polymerization wherein a vinyl chloride monomer is polymerized...
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4058654 |
Process for the bulk polymerization of α-olefins
Process for the continuous production of a polymer of an α-olefin monomer. The monomer is polymerized in bulk, employing a screw conveyor as the reactor. The monomer can be in liquid phase when...
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4042768 |
Continuous solvent-free polymerization of vinyl derivatives
A process for the polymerization of aromatic vinyl compounds and their copolymerization with alkyl esters or nitriles of acrylic and/or methacrylic acid, wherein 1. in a first stage, the monomer...
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4041088 |
Recirculation telomerization process and its liquid telomers and liquid telomers produced thereby
Recirculation process and apparatus for the preparation of normally liquid telomers derived from the reaction of a gaseous taxogen with a solution in a liquid telogen, such as toluene, of an...
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4037040 |
Refluxing water-in-oil emulsion process for preparing water-soluble polyelectrolyte particles
There is provided a process for preparing water-soluble polyelectrolytes by a water-in-oil emulsion process. A mixture of a surfactant, free radical initiator, at least one water-soluble,...
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4032701 |
Continuous method for producing a dry, solid polyacrylamide
A process for producing polyacrylamide in a dry and solid form which includes the steps of mixing from 20 to 40% by weight of water and from 60 to 80% by weight of acrylamide to form an aqueous...
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4029863 |
Method of obtaining small particle size polymers and copolymers of vinyl chloride by bulk polymerization
In a process of bulk vinyl chloride polymerization involving a two stage stationary reaction zone polymerization wherein high speed agitation is used during the first stage and slow speed agitation...
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4021600 |
Slurry polymerization process
An improvement in a process for the copolymerization of ethylene and an α-olefin having 3 to 18 carbon atoms and optionally also a nonconjugated diene having only one readily polymerizable double...
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4020263 |
Process for the production of emulsion polyvinyl chloride under avoidance of vinyl chloride emissions
Vinyl chloride emissions from the gaseous phase of large scale vinyl chloride batch emulsion polymerizations are reduced by discharging the liquid phase only of the polymerizate to a discharge zone...
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4017670 |
Suspension polymerization process
The production of polymer beads by a suspension polymerization in which a vinyl aromatic monomer having a free-radical generating catalyst dissolved therein is suspended in an aqueous medium with...
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4012573 |
Method of removing heat from polymerization reactions of monomers in the gas phase
An improved method of removing heat from polymerization reactions of normally gaseous monomers in the gas phase comprising feeding the monomer in liquid form to a polymerization zone, immediately...
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