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7612148 |
Hydrogenation catalyst composition and method for hydrogenation of conjugated diene polymer
A method for hydrogenation of a conjugated diene polymer is provided. The conjugated diene polymer in an inert organic solvent is brought into contact with hydrogen in the presence of a...
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7550539 |
Partially neutralized chlorosulfonated polyolefin elastomers
At least partially neutralized chlorosulfonated ethylene/alpha-olefin elastomers containing 0.5-10 weight percent chlorine and 0.25 to 5 weight percent sulfur are prepared from...
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7446153 |
Preparation of brominated styrenic polymers or resins
Bromination of styrenic polymer is carried out in a closed reaction system to retain HX coproduct (where HX is HBr or HCl, or both) in the bromination reaction mixture at superatmospheric pressure....
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7432332 |
Polymer halogenation process with catalyst recovery
The present invention relates to a method for recovering antimony catalysts wherein the formation of insoluble solids is reduced.
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7014781 |
Methods and articles for maintaining hydantoinylated polymers in a biocidally active state
A composition and the method for sustaining the biocidal activity of chlorinated polystyrene hydantoin beads. The method comprises supplying a continuous low level halogen concentration to the...
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6852802 |
Organic polymer material, process for producing the same, and heavy-metal ion remover comprising the same
An object of the present invention is to provide a heavy metal ion scavenger having more excellent scavenging performance than previously. In order to attain this object, organic polymer materials...
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6767960 |
Process for preparing high impact vinyl aromatic polymer by continuous anion polymerization method
The present invention is to provide a continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of: i) charging and polymerizing vinyl...
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RE37902 |
Brominated polystyrene having improved thermal stability and color and process for the preparation thereof
In a process for the suppression of backbone halogenation during the bromination of polystyrenes comprising the step of pretreating a solution of a polystyrene reactant comprising from about five...
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6426391 |
Fluorination in liquid or supercritical carbon dioxide
A method of fluorinating a substance comprises providing a reaction mixture comprising a liquid or supercritical carbon dioxide reaction medium, a first reactant, and a second reactant, wherein the...
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6388018 |
Graft copolymers containing ionomer units
Graft copolymers having cationic units pendant to the backbone chain are disclosed. These polymers are prepared by reacting a polymer containing halogenated para-methylstyrene units in the chain,...
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6207765 |
Process for brominated styrenic polymers
This invention relates to the bromination of styrenic polymers by contacting same with a brominating agent in the presence of a bromination catalyst and, as a reaction solvent, bromochloro-methane.
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5977233 |
Brominated syndiotactic polystyrene and the use thereof
The present invention provides a method of producing a flame-retardant polymer comprising mixing one or more polymeric base resins with a source of brominated syndiotactic polystyrene that displays...
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5824767 |
Poly(arylene sulfide) compositions having improved processability
A process for improving the processability of poly(arylene sulfide) in melt spinning operations by treatment with a barium-containing compound and, optionally, a lubricant is disclosed.
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5637650 |
Brominated polysytrene having improved thermal stability and color and process for the preparation thereof
In a process for the suppression of backbone halogenation during the bromination of polystyrenes comprising the step of pretreating a solution of a polystyrene reactant comprising from about five...
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5616656 |
Method for making brominated syndiotactic styrenic polymers
The present invention provides a new method for making an improved flame-retardant additive comprising a brominated syndiotactic styrenic polymer. The method includes the steps of providing a...
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5616622 |
Crosslinked seeded copolymer beads and process of manufacture
Seeded cation-exchange resin beads are particularly susceptible to oxidative degradation which results in the leaching of organic carbon fragments. The leachability of organic carbon fragments of...
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5569723 |
Process for the bromination of alkyl rubbers
C 4 -C 16 alkyl rubbers are brominated by reacting the alkyl rubbers with bromine in the presence of organic azo compounds and/or alkali metal and/or alkaline earth metal hypochlorites and in the...
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5548029 |
Graft copolymers of para-alkylstyrene/isoolefin copolymers
Graft copolymers which are isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a"...
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5539059 |
Perfluorinated polyethers
This invention pertains to perfluoropolyethers and perhalogenated chlorofluoropolyethers that can be prepared by fluorinating addition polymers made by polymerizing epoxides.
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5532322 |
Process for preparing brominated polystyrene
Disclosed is a process for preparing a brominated polystyrene, which comprises reacting a polystyrene dissolved or dispersed in a halogenated hydrocarbon type solvent, with a brominating agent in...
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5373064 |
Process for producing chlorinated polyolefin in an aqueous suspension system comprising a metal salt of an alkyldiphenyl ether disulfonic acid
When chlorinating a polyolefin in an aqueous suspension system, a metal salt of an alkyldiphenyl ether disulfonic acid represented by the following formula [I], or together with an anionic...
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5362817 |
Polyisobutylene based block copolymers
A process for preparing linear block and three arm star block copolymers having blocks of polyisobutylene and blocks of anionically polymerizable monomers comprises mixing a first solution of a...
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5340552 |
Reactive matrix for removing impurities from hydride and inert gases and process
A macroreticulate polymer is provided for removing water vapor and oxidants from a gas having the formula: ##STR1## wherein Ar is a heteroaromatic moiety, M is bonded to the heteroaromatic moiety...
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5314968 |
Disinfecting resin
A polyhalide bactericidal resin, of the demand type, based on halogens, the preponderant being iodine. The release of iodine into the water which is purified is minimized, and contaminated water is...
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5286804 |
Halogenation of star-branched butyl rubber with improved neutralization
A process for halogenating star-branched butyl rubber is provided wherein water and a wetting agent or wetting agent precursor are added to a solution comprising the star-branched butyl rubber,...
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5220087 |
Preparation of strong and super acid catalysts using elemental fluorine
A fluorinated cation exchange resin catalyst is prepared by contacting a polymer containing pendant acid groups, particularly the radical --SO 3 X with elemental fluorine in the presence of a...
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5087674 |
Acid scavenged polymer halogenation
A process for halogenating polymers by contacting a polymer either in solution or in bulk with a halogenating agent in the presence of an acid scavenger. Halogenated polymer, e.g., butyl rubber,...
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5077345 |
Halogenation of polymers with improved neutralization
A halogenation process is provided for halogenating a polymer, in which process the halogenation reaction product is neutralized by reaction of an aqueous alkaline material in the presence of a...
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5068290 |
Process for the chlorination of polyolefins
A process for the chlorination of a polyolefin is provided in accordance with the present invention. This process comprises mixing an anti-coagulant with a finely divided polyolefin, and then...
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5051256 |
Biocidal complex and dressing formed therefrom
A novel complex of polypyrrolidone, also known as nylon-4, and iodine is disclosed. The complex has biocidal properties exhibiting especially the fungicidal and bactericidal properties of free...
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4975496 |
Process for brominating aromatic resins
Styrenic polymers are brominated by a process comprising dispersing at least one Lewis acid catalyst in at least one inert halogenated solvent and contacting said Lewis acid catalyst dispersion...
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4972026 |
Chlorinated terpolymers of ethylene
A chlorinated terpolymer of a precursor terpolymer containing 3-20 weight percent acrylic acid or methacrylic acid, 3-20 weight percent vinyl acetate and 60-90 weight percent ethylene contains...
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4933395 |
Process for imidizing vinyl-aromatic copolymers
Process for the imidization of vinyl-aromatic copolymers containing maleic anhydride, using as an imidizing agent an amide, the imidization being conducted in an anhydrous state and in the presence...
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4879353 |
Bromination of polystyrene using bromine as the reaction solvent
A process for the bromination of polystyrenic homo- and co-polymers using bromine as the reaction medium, bromine chloride as the bromination reagent and a Lewis acid catalyst substantially...
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4772421 |
Process for producing electroconductive resin composite
An electroconductive resin composite is produced by polymerizing at least one monomer a polymer of which is electroconductive in a matrix of a resin which exhibits the anisotropy in the melt phase...
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4703091 |
Halogenated butyl rubber
An improved halogenated butyl rubber wherein the polymer has a conjugated diene content of less than 0.25 mole % and a halogen content of at least 0.6 wt. %; at least 20 mole % of the halogen being...
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4681921 |
Process for preparing improved halogenated butyl rubber
Improved halogenated butyl rubbers are prepared by isomerizing the polymers so that a significant mole fraction of the halogen is in the primary allylic position. The isomerization is carried out...
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4486574 |
Polymers of methyl ethenyl benzene
Polymers of methyl styrene produced from an isomer mixture having a high content of the para-isomer are halogenated, sulfonated or subjected to other substitution reactions.
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4482678 |
Diene rubber composition and tire using it in tread
A diene rubber composition comprising as a main rubber component an elastomeric polymer having a glass transition temperature of not less than -50° C. selected from the group consisting of a...
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4473451 |
Vapor phase chlorination of polyolefins
An improved vapor phase process for chlorination of polyethylene in a fluidized bed is accomplished by chlorinating a mixture of powdered polyethylene and finely divided inorganic compounds having...
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4420590 |
Bacteriocidal resins and disinfection of water therewith
Novel strongly basic anion-exchange resins substantially loaded with controlled relative proportions of iodide-bromide polyhalides whereby, when water is passed therethrough which is contaminated...
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4381374 |
Halogenation of butadiene polymers in mixed solvents
Polybutadiene having high cis-1,4-configuration and dissolved in substantially anhydrous liquid organic solvent is reacted with chlorine, bromine or a mixture thereof. The solvent consists...
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4360455 |
Preparation of mixtures of brominated polystyrenes and brominated aromatic compounds
A mixture of brominated oligomeric polystyrenes, having a degree of polymerization of from 3 to 400, and low molecular weight brominated aromatic compounds of the diphenyl ether type is obtained by...
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4321331 |
High density ion exchange resins from haloalkylated aromatic polymer
High density ion exchange resins are prepared from cross-linked, haloalkylated monovinylidene aromatic polymers which have been halogenated in the presence of a Friedel-Crafts catalyst. For...
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4297452 |
Process for the manufacture of oxazoline and/or oxazine-modified adsorbent polymer resins
A novel process is disclosed for increasing the amount of grafted polymer formed during the production of polyamide-modified macroporous polystyrene/divinylbenzene cross-linked beads. Greater...
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4296151 |
Fluorinated polymeric surfaces
Surfaces of articles formed from (1) normally solid polymers of aliphatic mono-1-olefins and (2) elastomeric and resinous polymers of conjugated dienes and vinyl-substituted aromatic compounds are...
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4292415 |
Novel Fischer-Tropsch catalysts
Novel polymer-supported metal complexes of the formula: PS --R Me(CO) n H m where: PS represents a divinylbenzene crosslinked polystyrene in which the divinylbenzene crosslinking is...
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4254240 |
Continuous process for the preparation of bromochlorinated butyl rubber
A solution of butyl rubber in an inert solution such as n-hexane is halogenated in a continuous process using bromine chloride vapor and high intensity mixing means for both the halogenation and...
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4246354 |
Process for bromination of resins based on crosslinked vinylaromatic copolymers
This invention relates to a process for the preparation of high density resins by bromination of particles of crosslinked vinylaromatic copolymers of either the gel type or the ionic or non-ionic...
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4239848 |
Photocrosslinkable carbonyl-containing polymeric composition and element with cobalt complex
There is disclosed a composition, element, and process of imaging, wherein a polymeric binder is rendered photocrosslinkable by virtue of a photoresponsive source of amines, and by virtue of one or...
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