摘要:
Partially fluorinated compounds of specified formulas that are useful as chemical intermediates and monomers are disclosed. Partially fluorinated polymers prepared from one of these compounds are also disclosed. Fluoro-2,2-dimethyldioxolanes and copolymers thereof are further disclosed.
摘要:
Partially fluorinated compounds of specified formulas that are useful as chemical intermediates and monomers are disclosed. Partially fluorinated polymers prepared from one of these compounds are also disclosed. Fluoro-2,2-dimethyldioxolanes and copolymers thereof are further disclosed.
摘要:
Novel hydroxy containing fluorovinyl ethers, polymers of hydroxy containing fluorovinyl ethers, novel cyclic ethers, copolymers of selected hydroxy containing fluorovinyl ethers, a process for reducing ester containing fluorovinyl compounds to the corresponding alcohol with borohydrides, and a process for polymerizing hydroxy containing fluorovinyl ethers are disclosed.
摘要:
Novel hydroxy containing fluorovinyl ethers, polymers of hydroxy containing fluorovinyl ethers, novel cyclic ethers, copolymers of selected hydroxy containing fluorovinyl ethers, a process for reducing ester containing fluorovinyl compounds to the corresponding alcohol with borohydrides, and a process for polymerizing hydroxy containing fluorovinyl ethers are disclosed.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
Fluoroelastomers which contain copolymerized units of a fluoroolefin cure site monomer of the general formula: Rf—(CH2CF2)n—CH═CF2, wherein Rf is a C1-C6 perfluoroalkyl group or a C1-C6 perfluoroalkoxy group and n is an integer from 1-3, exhibit excellent physical properties and processability when cured with polyhydroxy compounds.
摘要:
Disclosed herein is a novel class of fluorovinyl ether monomers which are useful as cure site monomers in fluoroelastomers, a process for the preparation of these fluorovinyl ether monomers, and fluoroelastomer copolymer compositions that contain copolymerized units of these fluorovinyl ether monomers.
摘要:
Syntheses of fluorinated amide and fluorinated nitrile compounds are improved by use of particular media for the reactions. Fluorinated amide can also be synthesized in high yield in a neat reaction.