Abstract: Process for preparing a 2,3-dihaloperfluoropropionyl halide wherein an alkali metal chloride, bromide or iodide is contacted with a 3-haloperfluoropropene oxide in admixture in an inert liquid reaction medium.

Abstract: A process for preparing a polymer having perfluorocyclobutane rings by the steps of (a) contacting monomers having aromatic polyester, aromatic polyamide, or polyimide groups or combination thereof, at least two dimerizable perfluorovinyl groups; and (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed. Chain extending oligomers of polymers having poor processing characteristics by this process results in polymers which are more easily processed. For instance, perfluorocyclobutane groups formed in an extruder to chain lengthen polyimide oligomers, in effect, render polyimides extrudable. The polymer formed by the method preferably has polyimide groups. New monomers and polymers having imide and perfluorovinyl or perfluorocyclobutane structures, respectively, are prepared.

Abstract: Novel compounds have at least one perfluorocyclobutane ring and at least two functional groups suitable for forming condensation polymers. Preferably the compounds have a structures represented by Formula II: ##STR1## wherein R and R' independently represent optionally inertly substituted groups: X and X' represent any molecular structures which link R and R' with the perfluorocyclobutane ring; n and n' are the number of G and G' groups, respectively: and G and G' independently represent any reactive functional groups or any groups convertible into reactive functional groups. The compounds are preferably prepared by a process of thermally dimerizing trifluorovinyl compound to form a compounds of Formula IG.sub.n -R-X-CF.dbd.CF.sub.2wherein G represents G or G' in Formula II: X represents X or X' of Formula II: and n represents n or n' of Formula II, to form a compound having a perfluorocyclobutane group.

Abstract: A compound having at least one perfluorovinyl group and at least one functional group is suitable for reacting with and/or forming polymers. The compound is preferably of Formula I:(G)n-R-(X--CF.dbd.CF.sub.2).sub.mwherein R represents an optionally substituted hydrocarbyl group, X represents any group which links R and a perfluorovinyl group; n is the number of G groups, m is the number of (XCF.dbd.CF.sub.2) groups; and G represents any reactive functional group or a group convertible into a reactive functional groups.A process for preparing a compound of Formula I comprises the steps of:(a) preparing a 2-halotetrafluoro compound of the Formula III:(Q--CF.sub.2 --CF.sub.2 -X).sub.m -R-(G").sub.

Abstract: Compounds have a structure represented by Formula I:CF.sub.2 .dbd.CF--X--R--(X--CF.dbd.CF.sub.2).sub.mwherein R represents an unsubstituted or inertly substituted hydrocarbyl group; each X is independently selected from the group consisting of groups having at least one non-carbon atom between R and --CF.dbd.CF.sub.2 ; and m is an integer of from 1 to about 3. Polymers formed from such compounds are also prepared. The compounds are preferably prepared by a method by a process comprising the steps of:(a) forming a salt having anion corresponding to a compound of Formula II:HX--R--(XH.sub.m);wherein X, R and m are as defined for Formula I:(b) reacting the salt with a 1,2-dihalo-1,1,2,2-tetrafluoroethane wherein the halo groups are iodine, bromine, chlorine or mixtures thereof, at least one halo group being bromine or iodine, to form a compound of Formula III:Z--CF.sub.2 CF.sub.2 --X--R--(X--CF.sub.2 CF.sub.2 --Z).sub.

Abstract: The present invention is a process for preparing a polymer having perfluorocyclobutane rings by the steps of (a) contacting monomers having at least two dimerizable perfluorovinyl groups; and (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed wherein at least about 0.05 mole percent of the monomer, have at least 3 dimerizable perfluorovinyl groups and polymers prepared thereby.

Abstract: A process for preparing a polymer having perfluorocyclobutane rings by the steps of (a) contacting monomers having at least two dimerizable perfluorovinyl groups; and (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed. The invention includes polymers having a backbone comprising hydrocarbyl groups, perfluorocyclobutane rings and non-carbon atoms and polymers of at least 10,000 molecular weight having repeating units [O-(CFR.sub.f).sub.n -O-perfluorocyclobutane].

Abstract: The present invention is a process for preparing a polymer having perfluorocyclobutane rings by the steps of (a) contacting monomers having at least two dimerizable perfluorovinyl groups; and (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed wherein at least about 0.05 mole percent of the monomer, have at least 3 dimerizable perfluorovinyl groups and polymers prepared thereby.

Abstract: A process for preparing a polymer having perfluorocyclobutane rings by the steps of (a) contacting monomers having at least two dimerizable perfluorovinyl groups; and (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed. The invention includes polymers having a backbone comprising hydrocarbyl groups, perfluorocyclobutane rings and non-carbon atoms and polymers of at least 10,000 molecular weight having repeating units [O-(CFR.sub.f).sub.n -O-perfluorocyclobutane].

Abstract: A compound having at least one perfluorovinyl group and at least one functional group is suitable for reacting with and/or forming polymers. The compound is preferably of Formula I:(G)n--R--(X--CF.dbd.CF.sub.2).sub.mwherein R represents an optionally substituted hydrocarbyl group, X represents any group which links R and a perfluorovinyl group; n is the number of G groups, m is the number of (XCF.dbd.CF.sub.2) groups; and G represents any reactive functional group of a group convertible into a reactive functional groups.A process for preparing a compound of Formula I comprises the steps of:(a) preparing a 2-halotetrafluoro compound of the formula III:(Q--CF.sub.2 --CF.sub.2 X).sub.m --R--(G").sub.

Abstract: Compounds have a structure represented by Formula I:CF.sub.2 =CF-X-R-(X-CF=CF.sub.2).sub.mwherein R represents an unsubstituted or inertly substituted hydrocarbyl group; each X is independently selected from the group consisting of groups having at least one non-carbon atom between R and --CF=CF.sub.2 ; and m is an integer of from 1 to about 3. Polymers formed from such compounds are also prepared. The compounds are preferably prepared by a method by a process comprising the steps of:(a) forming a salt having anion corresponding to a compound of Formula II:HX--R--(XH).sub.m ;wherein X, R and m are as defined for Formula I;(b) reacting the salt with a 1,2-dihalo-1,1,2, 2-tetrafluoroethane wherein the halo groups are iodine, bromine, chlorine or mixtures thereof, at least one halo group being bromine or iodine, to form a compound of Formula III:Z-CF.sub.2 CF.sub.2 -X-R-(X-CF.sub.2 CF.sub.2 - Z).sub.

Abstract: Novel compounds have at least one perfluorocyclobutane ring and at least two functional groups suitable for forming condensation polymers. Preferably the compounds have a structures represented by Formula II: ##STR1## wherein R and R' independently represent optionally inertly substituted groups; X and X' represent any molecular structures which link R and R' with the perfluorocyclobutane ring; n and n' are the number of G and G' groups, respectively; and G and G' independently represent any reactive functional groups or any groups convertible into reactive functional groups. The compound are preferably prepared by a process of thermally dimerizing trifluorovinyl compound to form a compounds of Formula IG.sub.n --R--X--CF.dbd.CF.sub.2wherein G represents G or G' in Formula II; X represents X or X' of Formual II; and n represents n or n' of Formula II, to form a compound having a perfluorocyclobutane group.

Abstract: The invention is a sulfonic fluoropolymer having a fluoropolymer backbone having pendant groups attached thereto and represented by the general formula:ZSO.sub.2 --(CF.sub.2).sub.a --(CFR.sub.f).sub.b --O--where: Z is a halogen, an alkali metal, hydrogen, or OR; R is a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; a is 0-2; b is 0-2; provided a+b is not equal to 0; R.sub.f is selected from the group consisting of --F, --Cl, perfluoroalkyl radicals having from 1 to about 10 carbon atoms and fluorochloroalkyl radicals having from 1 to about 10 carbon atoms, wherein the sulfonic fluoropolymer has an equivalent weight of less than about 725, and a hydration product of less than about 22,000.The invention also includes sulfonic fluoropolymers having a fluoropolymer backbone and having pendant groups attached thereto represented by the general formula:ZSO.sub.2 --(CF.sub.2).sub.a --(CFR.sub.f)b--O--where Z, a, b and R.sub.

Abstract: A composite comprising a functional fluoropolymer having pendant groups which terminate with a second reacting group and a first substrate having a first reacting groups, wherein at least a portion of the first reacting groups and at least a portion of the second reacting groups have reacted with each other to form covalent or ionic bonds.

Abstract: Novel vinyl ethers are prepared in decarboxylation reactions of novel acid fluoride compounds according to the following reaction: ##STR1## wherein a is 0 or an integer greater than 0;b is 0 or an integer greater than 0;n=1 or an integer greater than 1;R.sub.f and R.sub.f.sup.' are independently selected from the group consisting of F, Cl, perfluoroalkyl or fluorochloroalkyl;X=F, Cl, Br or mixtures thereof when n>1X'=Cl or Br;Y is an acid group or an acid derivative easily convertible to an acid group;Z=F, Cl, Br, OH, NRR' or OA;R and R' are independently selected from the group consisting of hydrogen, an alkyl having one or more than one carbon atoms, and aryl; andA=alkali metal, quaternary nitrogen, or R.These vinyl ethers may be homopolymerized with themselves or copolymerized with other vinyl ethers.

Abstract: Novel vinyl ethers are prepared in decarboxylation reactions of novel acid fluoride compounds according to the following reaction: ##STR1## wherein a is 0 or an integer greater than 0;b is 0 or an integer greater than 0;n=1 or an integer greater than 1;R.sub.f and R.sub.f ' are independently selected from the group consisting of F, Cl, perfluoroalkyl or fluorochloroalkyl;X=F, Cl, Br or mixtures thereof when n>1X'=Cl or Br;D is an acid group or an acid derivative easily convertible to an acid group;Z=F, Cl, Br, OH, NRR' or OA;R and R' are independently selected from the group consisting of hydrogen, an alkyl having one or more than one carbon atoms, and aryl; andA=alkali metal, quaternary nitrogen, or R.These vinyl ethers may be homopolymerized with themselves or copolymerized with other vinyl ethers.

Abstract: Compounds represented by the general formulas ##STR1## are prepared by reacting halofluoropropylene oxides with fluorinated acid fluorides and ketones.These compounds may be decarboxylated to form useful monomers, ##STR2## wherein a=to 3;b=to 3;c=0 or 1;provided a+b+c.noteq.0;n=zero or an integer greater than zero;R.sub.f =F, perfluoroalkyl or fluorochloroalkyl;X=F, Cl, Br or mixtures thereof when n>1;X'=Cl or Br;Y=Cl, Br, F or I;Z=F, OH, NRR' or OA;R and R' are independently selected from the group consisting of hydrogen, an alkyl having one or more than one carbon atom and an aryl;A=alkali metal, quaternary ammonium, R or an aryl.These monomers may then be polymerized into polymers having useful properties.

Abstract: This invention discloses improved heterogeneous acid catalysts and a method for preparing these catalysts. A heterogeneous acid catalyst has been prepared by treating a carrier material with a solution containing a fluorocarbonsulfonic acid polymer dissolved in a suitable solvent, removing the solvent, and heat treating the coated carrier in such a way so as to prevent the polymer from being leached off the carrier. The final heat treatment of the composition to prevent the polymer from redissolving comprises an improvement in the preparation of a heterogeneous catalyst.

Abstract: A process for converting amino carboxylic acid salts to their free acids employing a three compartment cell having sulfonic acid or carboxylic acid functional styrene divinylbenzene or fluorocarbon membranes forming the intermediate compartment between the anode and cathode compartments.

Abstract: There is described a process for converting salts of monobasic amino acids to their free acids by treatment under electrolytic methods wherein electrical power requirements are reduced, contamination of the electrolytes with undesired products of the electrolysis is substantially reduced, stronger concentrations of basic electrolyte is produced and utilized in the process by employing substantially permselective membranes having sulfonic and/or carboxylic functionality.