LE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (France)
Inventeur(s)
Hung, Ming-Hong
Ameduri, Bruno
Kostov, Georgi
Abrégé
Disclosed herein is a crosslinked fluoropolymer network formed by the free radical initiated crosslinking of a diacrylate fluoropolymer. The diacrylate copolymer is of formula CH2=CR'COO-(CH2)n-R-(CH2)n-OOCR'=CH2, wherein R is selected from the group consisting of i) an oligomer comprising copolymerized units of vinylidene fluoride and perfluoro(methyl vinyl ether), ii) an oligomer comprising copolymerized units of vinylidene fluoride and hexafluoropropylene, iii) an oligomer comprising copolymerized units of tetrafluoroethylene and perfluoro(methyl vinyl ether), and iv) an oligomer comprising copolymerized units of tetrafluoroethylene and a hydrocarbon olefin, R' is H or -CH3, n is 1-4 and wherein said oligomer has a number average molecular weight of 1000 to 25,000 daltons. The source of the free radicals may be a photoinitiator or an organic peroxide.
C08F 299/00 - Composés macromoléculaires obtenus par des interréactions de polymères impliquant uniquement des réactions entre des liaisons non saturées carbone-carbone, en l'absence de monomères non macromoléculaires
LE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (France)
Inventeur(s)
Hung, Ming-Hong
Ameduri, Bruno
Kostov, Georgi
Abrégé
Disclosed herein is a telechelic diacrylate fluoropolymer and a process for manufacture of the fluoropolymer. The diacrylate copolymer is of formula CH2=CR'COO-(CH2)n-R-(CH2)n-OOCCR'=CH2, wherein R is selected from the group consisting of i) an oligomer comprising copolymerized units of vinylidene fluoride and perfluoro(methyl vinyl ether), ii) an oligomer comprising copolymerized units of vinylidene fluoride and hexafluoropropylene, iii) an oligomer comprising copolymerized units of tetrafluoroethylene and perfluoro(methyl vinyl ether), and iv) an oligomer comprising copolymerized units of tetrafluoroethylene and a hydrocarbon olefin, R' is H or -CH3, n is 1-4 and wherein said oligomer has a number average molecular weight of 1000 to 25,000 daltons.
Le Centre National de la Recherche Scientifique (France)
Inventeur(s)
Hung, Ming-Hong
Ameduri, Bruno
Boutevin, Bernard
Soules, Aurelien
Abrégé
Fluorinated copolymers are prepared via copolycondensation polymerization in a process comprising reacting A) a telechelic fluoroazido compound of formula N3(Y)p-(CH2)n-R-(CH)m-(Y)pN3, wherein Y is SO, SO2 C6H4, or CO, p= 0 or 1, n and m are independently 1 to 4, and R is selected from the group consisting of i) a C3 - C10 fluoroalkylene group, ii) a C3 - C10 fluoroalkylene group, iii) a substituted aryl group, iv) an oligomer comprising copolymerized units of vinylidene fluoride and perfluoro(methyl vinyl ether), v) an oligomer comprising copolymerized units of vinylidene fluoride and hexafluoropropylene, vi) an oligomer comprising copolymerized units of tetrafluoroethylene and perfluoro(methyl vinyl ether), and vii) an oligomer comprising copolymerized units of tetrafluoroethylene and a hydrocarbon olefin with B) a telechelic diyne or dinitrile compound in the presence of copper halide catalyst.
C08G 83/00 - Composés macromoléculaires non prévus dans les groupes
C08L 27/12 - Compositions contenant des homopolymères ou des copolymères de composés possédant un ou plusieurs radicaux aliphatiques non saturés, chacun ne contenant qu'une seule liaison double carbone-carbone et l'un au moins étant terminé par un halogèneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique contenant du fluor
LE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (France)
Inventeur(s)
Hung, Ming-Hong
Ameduri, Bruno
Tillet, Guillaume
Abrégé
This invention relates to curable fluoroelastomer compositions comprising a) fluoroelastomers having either nitrile, alkyne or azide cure sites and b) fluorinated curatives containing diazide, dinitrile or dialkyne groups for reacting with cure sites on the fluoroelastomer. Fluoroelastomers having azide cure sites form crosslinks with curatives having dinitrile or dialkyne groups. Fluoroelastomers having nitrile or alkyne cure sites form crosslinks with curatives having diazide groups.
C08L 27/12 - Compositions contenant des homopolymères ou des copolymères de composés possédant un ou plusieurs radicaux aliphatiques non saturés, chacun ne contenant qu'une seule liaison double carbone-carbone et l'un au moins étant terminé par un halogèneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique contenant du fluor
A process aid for improving the processability of non-fluorinated melt processible polymers contains a fluoroelastomer having a Mooney viscosity (ML (1+10) at 121oC) between 30 and 100 and at least two interfacial agents, one a polycaprolactone having a Mn between 2000 and 8000 and the other a polyalkylene oxide having a Mn between 3000 and 5000.
C08L 27/12 - Compositions contenant des homopolymères ou des copolymères de composés possédant un ou plusieurs radicaux aliphatiques non saturés, chacun ne contenant qu'une seule liaison double carbone-carbone et l'un au moins étant terminé par un halogèneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique contenant du fluor
Disclosed herein is a fuel management system having at least one fluororubber article in contact with biodiesel fuel wherein said fluororubber article comprises i) a polyhydroxy cured fluoroelastomer comprising copolymerized units of vinylidene fluoride and at least one other fluoromonomer, and ii) 1 to 10 parts by weight of a diester of a dicarboxylic acid per hundred parts fluoroelastomer. Also disclosed is a method for reducing volume swell of a polyhydroxy cured fluororubber article in contact with biodiesel fuel wherein 1 to 10 parts by weight of a diester of a dicarboxylic acid is incorporated into said article.
Cured perfluoroelastomers that contain high levels (i.e. at least 65 phr carbon black) and 1 to 15 phr of a perfluoropolyether exhibit good resistance to explosive decompression while maintaining good sealing properties.
C08J 5/02 - Traitement direct des dispersions, p. ex. du latex, pour produire des objets
C08L 27/18 - Homopolymères ou copolymères du tétrafluoro-éthylène
C08L 71/00 - Compositions contenant des polyéthers obtenus par des réactions créant une liaison éther dans la chaîne principaleCompositions contenant des dérivés de tels polymères
C08J 5/10 - Renforcement des composés macromoléculaires avec des matériaux fibreux en vrac ou en nappes caractérisé par les additifs utilisés dans le mélange de polymères
8.
IMPROVED FLUOROELASTOMER PROCESSING AID MASTERBATCH AND METHOD FOR PRODUCING SAME
A fluoroelastomer masterbatch comprising a particulate matrix material wherein the particles of the matrix material have an average size selected from the range of from 1 µm to 1000 µm in diameter, the concentration of fluoroelastomer is from about 0.2% to 40% by weight, and the fluoroelastomer is dispersed within the interstitial spaces of the particulate matrix material.
C08L 27/18 - Homopolymères ou copolymères du tétrafluoro-éthylène
C08L 67/08 - Polyesters modifiés soit par des huiles d'acides gras supérieurs ou leurs acides, soit par des résines naturelles ou des acides résiniques
C08J 3/22 - Formation de mélanges de polymères avec des additifs, p. ex. coloration en utilisant les techniques des charges mères
C08J 3/16 - Pulvérisation ou granulation par coagulation de dispersions
C08L 27/12 - Compositions contenant des homopolymères ou des copolymères de composés possédant un ou plusieurs radicaux aliphatiques non saturés, chacun ne contenant qu'une seule liaison double carbone-carbone et l'un au moins étant terminé par un halogèneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique contenant du fluor
In a process for the manufacture of fluoroelastomers, a water-soluble polymeric coagulant is employed that is an aqueous solution of polyethylene oxide homopolymer or copolymer having a viscosity average molecular weight of 500,000 or greater.
C08J 3/03 - Production de solutions, dispersions, latex ou gel par d'autres procédés que ceux utilisant les techniques de polymérisation en solution, en émulsion ou en suspension dans un milieux aqueux
Polyhydroxy curable fluoropolymer compositions comprise polyhydroxy curable fluoropolymer, a β-fluoroalcohol having the formula R-(CF2)n-CH2-OH, wherein R is H, F or CH3O and n is an integer from 2 to 7, a polyhydroxy curative, acid acceptor and accelerator.
Polyhydroxy curable fluoroelastomer compositions contain at least one process aid that is an aminosilicone having only a single primary amine group per polysiloxane molecule.
C08L 27/12 - Compositions contenant des homopolymères ou des copolymères de composés possédant un ou plusieurs radicaux aliphatiques non saturés, chacun ne contenant qu'une seule liaison double carbone-carbone et l'un au moins étant terminé par un halogèneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique contenant du fluor
C08L 83/08 - Polysiloxanes contenant du silicium lié à des groupes organiques contenant des atomes, autres que le carbone, l'hydrogène et l'oxygène
C08L 27/16 - Homopolymères ou copolymères du fluorure de vinylidène
C08L 27/18 - Homopolymères ou copolymères du tétrafluoro-éthylène
C08L 61/12 - Polymères de condensation obtenus uniquement à partir d'aldéhydes ou de cétones avec des phénols d'aldéhydes avec des phénols avec des phénols polyhydriques
A fluoroelastomer latex composition stabilized against settling with from 1 wt% up to 50 wt% of a natural or synthetic pulp, comprising fibers having an average length of from 0.1 mm to 13 mm, uniformly dispersed therein.
C08L 27/12 - Compositions contenant des homopolymères ou des copolymères de composés possédant un ou plusieurs radicaux aliphatiques non saturés, chacun ne contenant qu'une seule liaison double carbone-carbone et l'un au moins étant terminé par un halogèneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique contenant du fluor
C08L 27/18 - Homopolymères ou copolymères du tétrafluoro-éthylène
C08L 27/16 - Homopolymères ou copolymères du fluorure de vinylidène
C08L 15/02 - Dérivés du caoutchouc contenant des halogènes
C08K 7/00 - Emploi d'ingrédients caractérisés par leur forme
In a process for the manufacture of perfluoroelastomers, a weak organic acid, e.g. glacial acetic acid, is employed to coagulate an acidic perfluoroelastomer dispersion.
Chlorosulfonated polyolefin elastomers containing 1 - 10 weight percent chlorine and 0.5 to 5 weight percent sulfur and having a Cl:S weight ratio of 10 or less are prepared in a batch solution process employing a chlorosulfonation agent of sulfuryl chloride or the combination of Cl2 and SO2.
C08F 297/04 - Composés macromoléculaires obtenus en polymérisant successivement des systèmes différents de monomère utilisant un catalyseur de type ionique ou du type de coordination sans désactivation du polymère intermédiaire utilisant un catalyseur du type anionique en polymérisant des monomères vinylaromatiques et des diènes conjugués
15.
PEROXIDE CURABLE FLUOROELASTOMER COMPOSITIONS AND ARTICLES MADE THEREFROM
Peroxide curable fluoroelastomer compositions and articles made therefrom are disclosed. The compositions contain 5 to 45 weight percent, based on total weight of all fluoroelastomers present in the composition, of a blend of dynamically cured fluoroelastomer particles in an uncured fluoroelastomer. The compositions are unfilled, but have tensile properties adequate for many end use applications and are particularly useful as seals in semiconductor manufacturing equipment.
Copolymer comprising at least 50 mol percent up to 85 mol percent tetrafluoroethylene (TFE), from 10 - 35 mol percent 3,3,3-trifluoropropylene (TFP), and from 0.5 - 15 mol percent of a fluorinated ethylenically unsaturated monomer of the formula RCF=CR?2#191 wherein R, which can be the same or different, is selected from the group consisting of H, F, Cl, Br, I, alkyl of from 1 to 8 carbon atoms, perfluoroalkyl of from 1 to 8 carbon atoms, and perfluoroalkylether of from 1 to 8 carbon atoms are useful as process aids and for fuel barrier applications in flexible hose constructions.
An emulsion polymerization process for the production of fluoroelastomers is disclosed wherein at least one fluorosurfactant is employed as dispersant, said fluorosurfactant being a fluoroalkylphosphoric acid ester of the formula X-Rf-(CH2)n-O-P(O)(OM)2, wherein n = 1 or 2, X = H or F, M = a univalent cation, and Rf is a C4 - C6 fluoroalkyl or fluoroalkoxy group. Optionally, a second dispersing agent may be employed in the polymerization, said second agent being a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a salt thereof, sulfonic acid and a salt thereof, phosphoric acid and a salt thereof.
An emulsion polymerization process for the production of non-elastomeric fluoropolymers is disclosed wherein at least one fluorosurfactant is employed as dispersant, said fluorosurfactant being a fluoroalkylphosphoric acid ester of the formula X-Rf-(CH2)n-O-P(O)(OM)2, wherein n is 1 or 2, X = H or F, M = a univalent cation, and Rf is a C4 - C6 fluoroalkyl or fluoroalkoxy group. Optionally, a second dispersing agent may be employed in the polymerization, said second agent being a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a salt thereof, sulfonic acid and a salt thereof, phosphoric acid and a salt thereof.
Purified chlorinated alkenes are produced by a process in which a mixture of i) a first chlorinated alkene that has at least one beta-chlorine substituent and no alpha-chlorine substituents and ii) a second chlorinated alkene that has at least one alpha-chlorine substituent is contacted with chlorine in an amount sufficient to further chlorinate the second chlorinated alkene, but which is insufficient to cause conversion of more than 20% of the first chlorinated alkene. The resultant reaction product may be easily enriched to provide a chlorinated alkene product wherein a) the weight percentage of chlorinated alkenes having at least one beta-chlorine substituent and no alpha-chlorine substituents, based on the total weight of the chlorinated alkenes present in the enriched chlorinated alkene product compared to b) the weight percentage of chlorinated alkenes having at least one beta-chlorine substituent and no alpha-chlorine substituents, based on the total weight of the chlorinated alkenes present in the mixture prior to chlorination is increased by at least 0.25 wt.%.
C07C 17/358 - Préparation d'hydrocarbures halogénés par des réactions n'influençant pas le nombre d'atomes de carbone ou d'halogène dans les molécules par isomérisation
2,3-dichlorobutadiene-1,3 of high purity is produced from 1,2,3,4-tetrachlorobutane by a process comprising the steps of dehydrochlorination, chlorination of the reaction product obtained in the dehydrochlorination step and subsequent separation of a 2,3-dichlorobutadiene-1,3 composition from the reaction product of the chlorination step.
C07C 17/358 - Préparation d'hydrocarbures halogénés par des réactions n'influençant pas le nombre d'atomes de carbone ou d'halogène dans les molécules par isomérisation
C07C 17/35 - Préparation d'hydrocarbures halogénés par des réactions n'influençant pas le nombre d'atomes de carbone ou d'halogène dans les molécules
C07C 17/395 - SéparationPurificationStabilisationEmploi d'additifs par traitement donnant lieu à une modification chimique d'au moins un composé
Disclosed herein are novel fluoroolefins of formula Rf-O- (CF2CF2)n(CH2CF2)m-CH=CH2, wherein n is 1 or 2, m is 0 or 1 and Rf is a C1- C8 fluoroalkyl or fluoroalkoxy group. The fluoroolefins may be oxidized to manufacture fluorinated carboxylic acids. Also disclosed are fluoropolymers comprising copolymerized units of the fluoroolefins of the invention and at least one other fluoromonomer.
C07C 43/17 - Éthers non saturés contenant des atomes d'halogène
C07C 51/285 - Préparation d'acides carboxyliques, de leurs sels, halogénures ou anhydrides par oxydation avec des composés peroxydés
C07C 59/135 - Composés saturés ne comportant qu'un groupe carboxyle et contenant des groupes éther, des groupes , des groupes ou des groupes contenant des atomes d'halogène
C07C 41/22 - Préparation d'éthers par des réactions ne formant pas de liaisons sur l'oxygène de la fonction éther par introduction d'atomes d'halogènePréparation d'éthers par des réactions ne formant pas de liaisons sur l'oxygène de la fonction éther par substitution d'atomes d'halogène par des atomes d'autres halogènes
C07C 41/24 - Préparation d'éthers par des réactions ne formant pas de liaisons sur l'oxygène de la fonction éther par élimination d'atomes d'halogène, p. ex. par élimination d'HCl
C07C 41/30 - Préparation d'éthers par des réactions ne formant pas de liaisons sur l'oxygène de la fonction éther par augmentation du nombre d'atomes de carbone, p. ex. par oligomérisation
An emulsion polymerization process for the production of fluoropolymers is disclosed wherein a combination of at least two fluorosurfactants is employed as dispersants. At least one fluorosurfactant is a perfluoroalkyl or perfluoroalkoxy sulfinate. At least one other fluorosurfactant is a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a slat thereof, sulfonic acid and a salt thereof.
An emulsion polymerization process for the production of fluoropolymers that contain polymerized units of tetrafluoroethylene is disclosed wherein a perfluoroaliphatic sulfinate is employed as dispersant.
Oligomers of perfluoro(methyl vinyl ether) with vinylidene fluoride or tetrafluoroethylene are disclosed that contain 40-90 mole percent copolymerized units of vinylidene fluoride or tetrafluoroethylene and 10-60 mole percent copolymerized units of perfluoro(methyl vinyl ether), said oligomers having two functional endgroups and having a number average molecular weight between 1000 and 25,000.
An extrudable composition comprising a non-fluorinated, melt processable host polymer and from about 25 parts per million by weight to about 50% by weight, based on total weight of said extrudable composition, of a fluoropolymer consisting essentially of copolymerized units of from 45 to 95 mole percent, based on total weight of said fluoropolymer, of tetrafluoroethylene (TFE) and from 5 and 55 mole percent, based on total weight of said fluoropolymer, of 3,3,3-trifluoropropylene (TFP).
Composite structures are manufactured from fiber and saturant. The saturant composition comprises a polymerization initiator system and a binder of chlorosulfonated polyolefin and a monomer mixture. The monomer mixture comprises 1) (meth)acrylic monomers having a single (meth)acrylic group and 2) (meth)acrylate monomers having at least two (meth)acrylate groups.
C08L 33/08 - Homopolymères ou copolymères des esters de l'acide acrylique
C08L 33/10 - Homopolymères ou copolymères des esters de l'acide méthacrylique
C08L 23/34 - Compositions contenant des homopolymères ou des copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneCompositions contenant des dérivés de tels polymères modifiées par post-traitement chimique par réaction avec des composés contenant du phosphore ou du soufre par chlorosulfonation
In a process for the manufacture of fluoroelastomers, a water-soluble polymeric coagulant is employed that is an aqueous solution of polyethyleneimine or its copolymers.
C08C 1/15 - Coagulation caractérisée par les coagulants utilisés
C08J 3/03 - Production de solutions, dispersions, latex ou gel par d'autres procédés que ceux utilisant les techniques de polymérisation en solution, en émulsion ou en suspension dans un milieux aqueux
An oil concentrate comprising oil and one or more at least partially neutralized chlorosulfonated polyolefin elastomers containing 0.5 50 weight percent chlorine and 0.25 to 5 weight percent sulfur is disclosed.
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 ethylene/alpha-olefin copolymer base resins having a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) less than 3.5.
C08L 23/34 - Compositions contenant des homopolymères ou des copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneCompositions contenant des dérivés de tels polymères modifiées par post-traitement chimique par réaction avec des composés contenant du phosphore ou du soufre par chlorosulfonation
Chlorosulfonated propylene/olefin elastomers containing 0.5 55 weight percent chlorine and 0.15 to 5 weight percent sulfur are prepared from metallocene catalyzed propylene/olefin copolymer base resins having a ratio of Mw/Mn less than 3.5 and a copolymerized propylene content of 70 - 98 weight percent.
C08L 23/34 - Compositions contenant des homopolymères ou des copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneCompositions contenant des dérivés de tels polymères modifiées par post-traitement chimique par réaction avec des composés contenant du phosphore ou du soufre par chlorosulfonation
Chlorosulfonated polyolefin elastomers containing 0.5 - 10 weight percent chlorine and 0.25 to 5 weight percent sulfur are prepared in a low temperature (50° to 75°C) solution process employing a chlorosulfonation agent of sulfuryl chloride or the combination of Cl2 and SO2.
Partially neutralized chlorosulfonated polyolefin elastomers containing 0.5 10 weight percent chlorine and 0.25 to 5 weight percent sulfur are prepared from polyolefin elastomer base resins selected from the group consisting of propylene/ethylene copolymers, ethylene/propylene/diene copolymers, isobutylene/diene copolymers, isobutylene homopolymers, hydrogenated styrene/butadiene block copolymers and hydrogenated styrene/isoprene block copolymers.
C08F 8/44 - Préparation de sels métalliques ou de sels d'ammonium
C08C 19/20 - Incorporation d'atomes de soufre dans la molécule
C08L 23/34 - Compositions contenant des homopolymères ou des copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneCompositions contenant des dérivés de tels polymères modifiées par post-traitement chimique par réaction avec des composés contenant du phosphore ou du soufre par chlorosulfonation
C08L 53/02 - Compositions contenant des copolymères séquencés possédant au moins une séquence d'un polymère obtenu par des réactions ne faisant intervenir que des liaisons non saturées carbone-carboneCompositions contenant des dérivés de tels polymères contenant des monomères vinylaromatiques et des diènes conjugués
C08F 210/16 - Copolymères de l'éthylène avec des alpha-alcènes, p. ex. caoutchoucs EP
C08F 210/18 - Copolymères de l'éthylène avec des alpha-alcènes, p. ex. caoutchoucs EP avec des diènes non conjugués, p. ex. caoutchoucs EPT
C08F 210/12 - Isobutène avec des dioléfines conjuguées, p. ex. caoutchouc butyle
C08F 297/04 - Composés macromoléculaires obtenus en polymérisant successivement des systèmes différents de monomère utilisant un catalyseur de type ionique ou du type de coordination sans désactivation du polymère intermédiaire utilisant un catalyseur du type anionique en polymérisant des monomères vinylaromatiques et des diènes conjugués
Compositions of fluoroelastomers containing copolymerized units of tetrafluoroethylene, propylene, a first cure site selected from the group consisting of i) trifluoroethylene, ii) 3,3,3-trifluoropropene-1, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene, and a second cure site selected from the group consisting of i) copolymerized units of a brominated cure site monomer, ii) copolymerized units of an iodinated cure site monomer, iii) copolymerized units of a chlorinated cure site monomer, iv) brominated endgroups, v) iodinated endgroups and vi) a combination of any of i) - v) are readily curable with polyhydroxy curing systems. The resulting cured articles have a combination of excellent resistance to alkaline fluids, superior tensile properties and compression set resistance, and excellent adhesion to metal substrates. Optionally, the fluoroelastomers may be dual cured by both a polyhydroxy system and an organic peroxide system.
In a process for the manufacture of fluoroelastomers, a coagulant is employed that is a water-soluble polymer having at least 2 quaternary onium centers. Specific examples of such coagulants include, but are not limited to poly(diallyldimethylammonium chloride), poly(epichlorohydrin-co-dimethyl amine), and poly(acrylamide-co-diallyldimethylammonium chloride).
A novel emulsion polymerization process for the production of fluoroelastomers is disclosed wherein the dispersing agent is a phosphate ester anionic surfactant of the formula [CH3-(CH2)n-O]x-P(OM)(4-x) where n is an integer from 0 to 8, or mixtures thereof, x is an integer from 1 to 3 and M is a cation having a valence of 1.
A novel semi-batch emulsion polymerization process for the production of fluoroelastomers is disclosed wherein a hydrocarbon anionic surfactant is employed as the dispersing agent. The surfactant has the formula R-L-M wherein R is an alkyl group having between 6 and 17 carbon atoms, L is selected from the group consisting of ArSO3-, SO3 -, SO4-, PO3- and COO- and M is a univalent cation. Preferred surfactants are sulfonates of the formula CH3-(CH2)n-SO3M, CH3-(CH2)n-C6H4-SO3M, or CH3-(CH2)n-CH=CHCH2-SO3M, where n is an integer from 6 to 17, or mixtures thereof, and M is a cation having a valence of 1. Surfactant is not introduced to the reactor until shortly after the polymerization reaction has begun.
The surface roughness of extruded wood composites and the die pressure in the extrusion process is improved by the incorporation of a process aid comprising fluoropolymer and a salt selected from the group consisting of potassium tetraborate, potassium pentaborate, potassium chloride, and the sodium, calcium or potassium salt of sulfate, pyrosulfate, persulfate, sulfite, phosphate, phosphite, and pyrophosphate.
C08L 23/02 - Compositions contenant des homopolymères ou des copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneCompositions contenant des dérivés de tels polymères non modifiées par un post-traitement chimique
C08L 27/16 - Homopolymères ou copolymères du fluorure de vinylidène
C08L 51/06 - Compositions contenant des polymères greffés dans lesquels le composant greffé est obtenu par des réactions faisant intervenir uniquement des liaisons non saturées carbone-carboneCompositions contenant des dérivés de tels polymères greffés sur des homopolymères ou des copolymères d'hydrocarbures aliphatiques ne contenant qu'une seule liaison double carbone-carbone
C08L 97/02 - Matériau lignocellulosique, p. ex. bois, paille ou bagasse
38.
EMULSION POLYMERIZATION OF DIPOLYMERS OF TETRAFLUOROETHYLENE AND 3,3,3-TRIFLUOROPROPENE
An aqueous semi-batch polymerization process is disclosed for the manufacture of dipolymers of tetrafluoroethylene and 3,3,3-trifluoropropene that contain between 45 and 95 mole percent tetrafluoroethylene and between 5 and 55 mole percent 3,3,3-trifluoropropene.
Fluoroelastomers are disclosed that comprise copolymerized units of a vinyl ester of the formula CH2=CHOC(O)R, wherein R is a C1-C4 alkyl group and at least one monomer selected from the group consisting of tetrafluoroethylene and a perfluoro(alkyl vinyl ether). The elastomers may further contain copolymerized units of a hydrocarbon olefin such as ethylene or propylene. Optionally, fluoroelastomers of the invention may contain copolymerized units of a cure site monomer or a cure site monomer. Pendant ester groups on the fluoroelastomer may be at least partially saponified.
Fluoroelastomers are disclosed that comprise copolymerized units of vinylidene fluoride and a vinyl ester of the formula CH2=CHOC(O)R, wherein R is a C1-C4 alkyl group. In one embodiment of the invention, the fluoroelastomers further comprise copolymerized units of a perfluoro(alkyl vinyl ether) and, optionally, tetrafluoroethylene. In another embodiment, the vinylidene fluoride/vinyl ester fluoroelastomers further comprise hexafluoropropylene. Optionally, fluoroelastomers of the invention contain copolymerized units of a cure site monomer.
Perfluoroelastomers that contain high levels (i.e. about 40 mole percent or more) of perfluoro(alkyl vinyl ether) copolymerized units can form stable blends with higher levels of perfluoropolyethers than can perfluoroelastomers that contain lower levels of perfluoro(alkyl vinyl ether) units. Thus, the former blends have better low temperature properties than the latter.
C08L 27/18 - Homopolymères ou copolymères du tétrafluoro-éthylène
C08L 71/00 - Compositions contenant des polyéthers obtenus par des réactions créant une liaison éther dans la chaîne principaleCompositions contenant des dérivés de tels polymères
42.
PROCESS FOR THE MANUFACTURE OF FLUOROELASTOMERS HAVING BROMINE OR IODINE ATOM CURE SITES
Fluoroelastomers having bromine, iodine or both iodine and bromine cure sites are prepared by an emulsion polymerization process wherein any iodine or bromine containing comonomers and any iodine or bromine containing chain transfer agents are introduced to the reactor as aqueous emulsions, optionally containing a surfactant.
Disclosed herein are novel &agr;,&agr;-dihydrofluorovinyl ethers, homopolymers thereof and copolymers containing more than (22) mole percent copolymerized units of said ether. The ethers have the general formula Rf-⏧CH2]n-OCF=CF2, wherein n is (1) or (2), and Rf is selected from the group consisting of a perfluoroalkyl group, a perfluoroalkoxy group, a fluoroalkyl group and a fluoroalkoxy group.
The seal assemblies of this invention comprise a closure assembly having first and second grooves, with a rubber seal mounted in said first groove and a removably mounted, replaceable barrier strand in said second groove, said barrier located between the rubber seal and a plasma source, whereby said barrier shields the rubber seal from erosive effects of the plasma.
A surface of an aluminum substrate is anodized. A curable perfluoroelastomer composition is then compression molded and vulcanized onto the anodized aluminum surface. The bonded part may then be post cured in order to improve both the tensile properties of the vulcanized perfluoroelastomer and the bond strength to the surface of the aluminum substrate.
B29C 43/18 - Moulage par pressage, c.-à-d. en appliquant une pression externe pour faire couler la matière à moulerAppareils à cet effet pour la fabrication d'objets de longueur définie, c.-à-d. d'objets séparés en incorporant des parties ou des couches préformées, p. ex. moulage par pressage autour d'inserts ou sur des objets à recouvrir
F16J 15/12 - Joints d'étanchéité entre surfaces immobiles entre elles avec garniture solide comprimée entre les surfaces à joindre par garniture non métallique par renforcement ou couverture métallique
B32B 15/20 - Produits stratifiés composés essentiellement de métal comportant de l'aluminium ou du cuivre
