Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
  • C08G65/46—Post-polymerisation treatment, e.g. recovery, purification, drying
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
  • C07C41/48—Preparation of compounds having groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
  • C07C41/60—Preparation of compounds having groups or groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
  • C08G2/30—Chemical modification by after-treatment
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G4/00—Condensation polymers of aldehydes or ketones with polyalcohols; Addition polymers of heterocyclic oxygen compounds containing in the ring at least once the grouping —O—C—O—
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/002—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds
  • C08G65/005—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds containing halogens
  • C08G65/007—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds containing halogens containing fluorine
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/30—Post-polymerisation treatment, e.g. recovery, purification, drying
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/32—Polymers modified by chemical after-treatment
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/32—Polymers modified by chemical after-treatment
  • C08G65/321—Polymers modified by chemical after-treatment with inorganic compounds
  • C08G65/323—Polymers modified by chemical after-treatment with inorganic compounds containing halogens
  • C08G65/3233—Molecular halogen
  • C08G65/3236—Fluorine
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives

Definitions

• Perfluoropolyethers are highly regarded in the specialty lubricant field because of their wide liquid ranges, low vapor pressures and high thermal and oxidative stabilities. Because of these
• fluorocarbons they are excellent high performance lubricants, superior base stocks for greases, excellent lubricating oils, and heat transfer fluids. In addition, because of these uniquely outstanding properties, saturated
• perfluoropolyethers are of current interest as specialty sealants, elastomers and plastics.
• perfluoropolyethers by reaction of a hydrocarbon polyether with elemental fluorine in the presence of a hydrogen fluoride scavenger. See U.S. Patent No. 4,755,567.
• This invention relates to perfluoropolyether and perhalogenated chlorofluoroether polymers that can be prepared by fluorinating polymers made by the polymerization of acetals, ketals, polyacetals, polyketals and orthoesters with elemental fluorine.
• the products formed by the present invention have essentially the following formula:
• Y and Y' are the same or different and are selected from the group consisting of linear and branched perfluoroalkylenes having at least 2 carbon atoms; perfluoroalkyleneoxyalkylene and perfluoro- poly (alkyleneoxyalkylene) each having alkylene groups containing at least two carbon atoms wherein in Y or Y' one or more of the fluorine atoms may be substituted by a halogen atom other than fluorine; wherein X and Z are the same or different and are selected from the group consisting of -(CF 2 ) r COF ,
• R 1 R 2 , R 3 and R 4 are the same or different and are selected from the group consisting of -F, -Cl, -CF 2 Cl, -CFCl 2 , -CCl 3 , perfluoroalkyl of one to ten carbon atoms and perfluoroalkoxyalky1 of one to ten carbon atoms wherein one or more of the fluorine atoms may be substituted by a halogen atom other than fluorine; wherein n is an integer from 2 to 1,000; and wherein m is an integer from 0 to 1,000; provided that when R 1 , R 2 , R 3 and R 4
• Y or Y' comprises an ethylene group having at least one fluorine atom which is substituted by a halogen other than fluorine.
• This invention also relates to perhalogenated polyethers of the formula:
• R 1 , R 2 , X and Z are defined above and n is an integer from 2 to 1000; provided that R 1 and R 2 cannot both be fluorine atoms.
• perfluoropolyethers and the perhalogenated chlorofluoropolyethers of this invention can be used as lubricants, hydraulic fluids, thermal shock fluids, vapor phase soldering fluids and in numerous other applications in which an inert, nonflammable, oxidatively stable fluid is required.
• the low molecular weight perfluoropolyethers of the present invention have many useful applications in the electronics industry.
• perhalogenated chlorofluoropolyether polymers have the formula: wherein Y and Y' are the same or different and are selected from the group consisting of linear and branched perfluoroalkylenes having at least 2 carbon atoms, preferrably having 2 to 6 carbon atoms;
• Y and Y' can be isotactic perfluoropolyethers or atactic perfluoropolyethers, such as -CF 2 CF 2 CF 2 , - CF 2 CF 2 CF 2 CF 2 -,
• CF 2 CF 2 OCF 2 CF 2 OCF 2 CF 2 - X and Z are the same or different and are selected from the group consisting of -(CF 2 ) r COF, -(CF 2 ) r OCF 3 , -(CF 2 ) r COOH and
• R 1 , R 2 , R 3 and R 4 are the same or different and are selected from the group consisting of -F, -Cl, -CF 2 Cl, CFCl 2 , -CCl 3 , perfluoroalkyl of one to ten carbon atoms, such as -CF 3 , -C 2 F 5 , -C 3 F 7 and -C 4 F 9 and perfluoroalkoxy- alkyl of one to ten carbon atoms, such as -OCF 3 and -OCF 5 , wherein one or more of the fluorine atoms in said perfluoroalkyl and perfluoroalkoxyalky1 may be substituted by a halogen atom other than fluorine.
• R 1 to R 4 are F and -CF 3 groups.
• n is an integer from 2 to 1,000; and m is an integer from 0 to 1,000; provided that when R 1 , R 2 , R 3 and R 4 together are F then Y or Y' comprises an ethylene group having at least one fluorine atom which is substituted with a halogen atom other than fluorine, preferrably by chlorine.
• n and m subscripts of formula I are average indices of composition such that when m is zero the polyether is referred to as an alternating copolymer of
• the polyether is a terpolymer containing
• This invention also relates to perfluoropolyethers and perhalogenated chlorofluoropolyethers of Formula I where Y and Y' are polyethers and have the average formula:
• R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are the same or different and are selected from the group consisting of -F, -Cl, -CF 2 Cl, -CFCl 2 , -CCl 3 , perfluoroalkyl of one to ten carbon atoms and perfluoroalkoxyalky1 of one to ten carbon atoms wherein one or more of the fluorine atoms may be substituted by a halogen atom other than fluorine; wherein X and Z are the same or different and are selected from the group consisting of -(CF 2 ) r COF, -(CF 2 ) r OCF 3 , -(CF 2 ) r COOH and
• R 5 or R 6 is a group other than fluorine.
• p and t are integers from 1 to 10.
• perfluoropolyethers where m in formula I is zero and p is an integer between 2 and 50 are shown below:
• perfluorinated polyethers of formula I where m is zero, p is defined above and Y is an isotactic perfluoropolyether or atactic perfluoropolyether are:
• Perfluoropolyethers and perhalogenated chlorofluoropolyethers can also be prepared which have the average formula:
• X is -CF 2 , -C 2 F 5 , -CF 2 COOH, -CF 2 OCF 3 and CF 2 COF; wherein n is an integer from 1 to 50; and wherein R is selected from the group consisting of -F, -CF 2 Cl, -CFCl 2 , CCl 3 and perfluoroalkyl of one to ten carbons.
• This invention further pertains to perfluoropolyethers and perhalogenated chlorofluoropolyethers having the average formula:
• R 1 , R 2 , X and Z are defined above, and n is an integer from 2 to 1000; provided that R 1 and R 2 cannot both be fluorine atoms.
• This invention further pertains to a method of making perhalogenated formal, acetal, ketal and orthocarbonate compounds and perfluoropolyether and perhalogenated chlorofluoropolyether polymers thereof.
• the compounds are made by fluorination of acetal, ketal, formal or othocarbonate hydrocarbon percursors.
• reaction of a diol with either an aldehyde, acetal, ketal or trialkyl orthoesters can be used to give a polyether if the starting materials and reaction conditions are carefully chosen.
• an aldehyde such as formaldehyde, acetaldehyde or butyraldehyde
• a linear polyether can be made.
• Suitable diols include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, other higher polyethylene glycols, propylene glycol, dipropylene glycol, tripropylene glycol, 2,2-dimethyl 1,3-propanediol, 1,4-butanediol, 1,5- pentanediol, 1,6-hexanediol, 1,7-heptanediol,
• aldehydes include formaldehyde, paraformaldehyde, 1,3,5-trioxane, acetaldehyde and its trimer, butyraldehyde and its trimer, pentanal, hexanal, 2-ethyl butanal, chloroacetaldehyde, dichloroacetaldehyde and trichloroacetaldehyde.
• An alternative means of preparing the same polymer involves the reaction of an acetal with a diol.
• the synthesis involves the initial preparation of an acetal by reaction of an alcohol with the aldehyde as shown in Equation (2) below:
• Equation (3) The acetal interchange is followed by a smoothly reversible reaction in acid media giving rise to the polyacetal. This reaction is given in Equation (3) below:
• Suitable acetals include the diethyl, dipropyl, dibutyl, dipentyl and diphenyl acetals of all of the previously mentioned aldehydes.
• a well known reaction which is particularly well suited for preparing copolymers of acetaldehyde involves the reaction of divinyl ethers with diols.
• divinyl ethers with diols.
• ethylene glycol divinyl ether will react with ethylene glycol in the presence of H + at -10°C to give a 1:1 copolymer of ethylene glycol and acetaldehyde.
• pentanediol will react with 1,5-pentanndiol to give a copolymer of pentanediol and acetaldehyde:
• CF 3 Terpolymers can be prepared by reacting a divinyl ether of one diol with a diol of a different
• the divinyl ether of ethylene glycol will react with 1,3-propanediol to yield a polyether after fluorination having the following structure:
• the divinyl ethers are conveniently formed by reacting a dihydroxyl terminated compound with acetylene at 160°C in the presence of KOH as shown below in Equation (5).
• aldehydes can be polymerized and fluorinated to give perf luoropolye thers that have unique and often us eful properties.
• chloroacetaldehyde can be polymerized and fluorinated to give perfluoropolychloroacetaldehyde.
• dichloroacetaldehyde and trichloro- acetaldehyde can be polymerized and fluorinated to give the perfluorocarbon analog of the polyethers.
• Chlorofluoroethers such as these are potentially useful, nonflammable aircraft hydraulic fluids.
• ketals include 2,2-dime- thoxypropane, 2,2-dimethoxybutane, 2,2-dimethoxy- pentane, 2 ,2-dimethoxyhexane, 3,3-dimethoxypentane, 3,3-dimethoxyhexane as well as the diethoxy, dipropoxy, dibutoxy and diphenoxy analogues of the previously mentioned ketals.
• Useful orthoesters include trimethylorthoformate, triethylorthoformate, tripropylorthoformate, tri- butylorthoformate, triphenylorthoformate, trimethyl- orthoacetate, triethylorthoacetate, tripropylortho- acetate, tributylorthoacetate, triphenylortho-acetate, trimethylorthopropionate, triethylortho- propionate, tripropylorthopropionate, tributylortho- propionate, triphenylorthopropionate, trimethyl- orthobutyrate, triethylorthobutyrate, tripropyl- orthobutyrate, tributylorthobutyrate and triphenyl- orthobutyrate.
• the cyclic products formed by the reaction of trimethylene glycol with dibutyl formal and the reaction of hexamethylene glycol with propionaldehyde polymerize in the presence of an acid to given linear polymers as described in U.S. Patent No. 2,071,252.
• the glycol is 1,4-butanediol or higher a linear polymer is formed whereas glycols having fewer carbons generally form rings.
• the glycol used is a polyether glycol, such as diethylene glycol or triethylene glycol
• the linear polymer represents a thermodynamically more stable structure.
• Conversion of the hydrocarbon polyether to a perfluoropolyether can be accomplished by reacting the polyether with elemental fluorine. Because of the reactive nature of elemental fluorine, it is preferably to dilute the fluorine with an inert gas such as nitrogen or helium. Typically, the fluorine is diluted with nitrogen and as higher degrees of fluorination are achieved, the concentration of fluorine is usually increased. Due to the extreme exothermicity of the reaction, the fluorination must be carried out slowly unless provisions have been made for rapidly removing the heat of reaction.
• Fluorine gas is the preferred fluorinating agent and is commercially available at sufficiently high purity levels and at an acceptable cost.
• the fluorination reaction is generally carried out at a temperature between -40 and +150°C, preferably between -10 and +50°C. It can be carried out in a reactor containing an ultraviolet radiation source or in the dark. Using the preferred temperature range, it is not necessary to have an ultraviolet light source since the fluorine Is sufficiently reactive. If an ultraviolet light source is used, however, a wavelength between 250 and 350 nm is preferred.
• a transparent window is needed which does not react with either fluorine or hydrogen fluoride.
• a quartz lens coated with a thin film of fluorinated ethylene-propylene copolymer works well.
• the fluorination reaction can be carried out in a variety of ways.
• the polyether can be coated on sodium fluoride powder to give a free-flowing powder which can be fluorinated in either a stationary tube, in a rotating drum- type reactor, or in a fluidized bed. See U.S. Patent No. 4,755,567 and U.S. Application Serial No. 07/198,154, filed May 24, 1988, the teachings of which are incorporated herein by reference.
• the polyether if soluble, can be dissolved in a solvent inert to fluorine and can be fluorinated while in solution using a liquid phase fluorination reactor. See U.S. Patent
• a typical laboratory-size reactor for example, has a volume of about 10 liters and contains approximately 2 to 8 liters of a suitable solvent.
• Perhalogenated chlorofluorocarbons are typically used as the fluorine- inert fluorination medium. However, perfluorocarbons, such as
• FluorinertTM FC75 [ 3M Corporation; mixture of perfluoro (2-butyltetrahydrofuran) and perfluoro (2-n- propyltetrahydropyran)] and perhalogenated chloro- fluoropolyethers may also be used as the liquid phase fluorination medium.
• One preferred fluorination medium is 1,1,2-trichlorotrifluoroethane since it does not react appreciably with fluorine when the preferred temperature range is used (above the melting point of the material and below the temperature at which the fluorine reacts with it).
• Other fluorinated solvents can be used, such as perfluoroamines, perfluoroalkanes, low molecular weight polyethers, etc.
• the polyether is fed into the reactor at a rate of 10 to 60 grams per hour.
• Fluorine gas is delivered to the vigorously stirred reactor at a rate sufficient to react with all of the organic feed plus an additional 5 to 10 percent.
• the fluorine gas is diluted with an inert gas such as nitrogen. This is of
• the flammability limits of various solvents in fluorine gas can be determined by spark testing. In a typical reaction, a fluorine concentration of 10 to 40% works well. If operating properly, the fluorine concentration in the exit gas will be between 2 and 4%.
• Fluorination can be carried out either in a batch mode where all of the polyether is dissolved in a solvent prior to fluorination or in a
• the polyether is insoluble in the liquid fluorination medium it can still be fluorinated in high yield as an emuls ion in the liquid phase
• An emulsified solution of the polyether and the fluorine-inert liquid fluorination medium can either be pumped into the reactor or the
• reactant can be emulsified in the reactor with the fluorination medium prior to the reaction.
• fluorination medium involves adding a solvent to the polyether which allows limited solubility of
• 1,1,2-trichlorotrifluoroethane has been selected as the liquid fluorination medium; however, other highly fluorinated solvents can also be used.
• a mixture containing one part polyether, one part solvent and one part 1,1,2 trichlorotri- fluoroethane will give a homogeneous solution.
• a solvent is selected which readily dissolves the polyether. Often it is possible to choose a solvent which will consume little, if any, of the fluorine gas.
• 1,1,2-trichloroethane work especially well and have high solvating power.
• the polyether/solvent/1,1,2-trichlorotri- fluoroethane solution is metered into a vigorously stirred fluorination reactor. As the polyether solution contacts the 1,1,2-trichlorotrifluoroethane in the reactor, an emulsion is formed.
• polyether droplets in the solution are in most cases sufficiently small and react quickly with the fluorine gas with negligible side reactions.
• a hydrogen fluoride scavenger such as sodium fluoride or potassium fluoride may or may not be present in the solution to scavenge the by-product hydrogen fluoride.
• the preferred mode of carrying out the fluorination reaction is with a sufficient quantity of sodium fluoride being present to complex with all of the hydrogen fluoride formed.
• Products produced using the methods just described usually have a residual hydrogen content of 0.001% or less.
• a final fluorination near 175°C with 30% fluorine for several hours works well.
• Polymerization of 450 g of 1,3,6-trioxocane was carried out at room temperature in 1 liter dry methylene chloride using 0.04 ml of trifluoromethane sulfonic acid as a catalyst. The polymerization was complete in 24 hours at which time 1 g of sodium methoxide dissolved in 50 ml of dry methanol was added to neutralize the acid catalyst. 3600 g sodium fluoride powder was added to the polymer along with an additional 1 liter of methylene chloride. The mixture was stirred, the methylene chloride was allowed to evaporate and the remaining solids were ground to a powder.
• the polymer-coated sodium fluoride was placed in a 20 liter rotating drum reactor and dried under a stream of inert gas (e.g., nitrogen) for a period of 12 hours. The mixture was then exposed to 500 cc fluorine diluted with 2 liters of nitrogen for approximately 30 hours at 25°C. Next, the nitrogen flow was reduced to 1 liter/min and the reaction was allowed to continue for an additional 12 hours after which time the reactor was slowly warmed to 70°C over a 6 hour period. Treatment with pure fluorine for several hours at 70°C gave a product which contained very few hydrogen atoms. Extraction of the reaction product with 5 liters of 1,1,2-trichlorotrifluoroethane gave 386 grams of fluid (34%).
• inert gas e.g., nitrogen
• Example 1 the fluid prepared in Example 1 was prepared using an alternate method which was better suited for preparing fluids while the method described in Example 1 yields a considerable amount of polymeric solids.
• the mixture was refluxed for several hours to remove the water formed during the reaction.
• the solution was first filtered to remove the ion exchange resin, then distilled to 150°C at 0.05 mm/Hg to remove the toluene and other lights. A nearly quantitative yield of polymer having an average molecular weight of 1500 was obtained.
• resulting paste was dried In a vacuum oven at 60°C for several hours prior to grinding to a coarse powder (approximately 30 mesh).
• the powder was placed in a 1 liter rotating brass reactor and was purged with 200 cc of dry nitrogen for several hours prior to the fluorination.
• the reactor was cooled to 0°C, the nitrogen flow was reduced to 150 cc/min and the fluorine flow was set at 20 cc/min. These conditions were maintained for approximately 30 hours after which time the nitrogen flow was reduced to 100 cc/min and the reactor was allowed to slowly warm to 45°C over a 4 hour period. Next, the nitrogen flow was turned off and the reactor was slowly warmed to 70°C over a 3 hour period.
• the product was fractionated into three samples, one which boiled below 200°C at 0.05 mm Hg (40%), a second which boiled between 200 and 300°C at 0.05 mm (35%) and a third having a boiling point above 300°C at 0.05 mm Hg (25%).
• the intermediate fraction had a viscosity of 33.1 cst. at 20°, 6.3 cst. at 80° and 2.13 cst. at 150°C.
• the pour point was -79°C.
• the analysis was consistent with the formula: [CF 2 CF 2 OCF 2 CF 2 OCF 2 CF 2 0CF 2 CF 2 OCF 2 O] n 1 9 F NMR ( ⁇ ppm vs CFCl 3 )
• the p o lymer (280 g ) was mixed with 340 ml
• 1,1,2-trichlorotrifluoroethane was slowly pumped Into a 15 liter stirred reactor over a 24 hour period.
• the reactor which contained 5.5 liters of 1,1,2-trichlorotrifluoroethane and 1220 g sodium fluoride powder, was maintained at 10°C throughout the reaction while 20% fluorine was bubbled through the liquid fluorination medium at a rate just exceeding that required to react with all of the starting material being pumped into the reactor.
• the reactor contents were filtered and distilled to give 587 g of fluid which was further treated with 50% fluorine at 270°C to give a fluid which was essentially free of hydrogen.
• the purified product was fractionated into three samples.
• the second fraction comprised approximately 20% of the total fluid with the majority of the sample having a boiling point below 200°C at 0.05 mm.
• a perfluoropolyether having the following structure is obtained:
• Chloroacetaldehyde (50 to 55 wt % in water) was distilled to give a fraction boiling between 87 and 92°C.
• a 3 liter stirred flask containing 1281 g of the chloroacetaldehyde distillate was placed in a room temperature water bath. While maintaining a temperature below 55°C, 500 ml of concentrated sulfuric acid was slowly added over a one hour period. The mixture was stirred for an additional 3 days at 53°C, then allowed to separate into two phases. The lower phase, containing sulfuric acid, was removed with a separatory funnel while the upper phase was placed into a 3 liter flask equipped with a mechanical stirrer.
• the product was dissolved in 450 g chloroform and 305 g 1,1,2-trichlorotrifluoroethane to give a solution which was metered over a 22 hour period into a 20°C fluorination reactor containing 5.5 liters of 1,1,2-trichlorotrifluoroethane.
• Fluorination of 318 g of the polymer, diluted with 235 g chloroform and 375 g 1,1,2-trichlorotri- fluoroethane, in a 12°C reactor containing 5 liters of 1,1,2-trichlorotrifluoroethane and 1200 g sodium fluoride powder gave 623 g (84% yield) of the fluorinated polyether in a 22-hour reaction.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• General Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Polyethers (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=22947508

Family Applications (2)

Family Applications Before (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (4)

• 1989
  • 1989-09-28 EP EP96203025A patent/EP0764674A2/de not_active Withdrawn
  • 1989-09-28 JP JP01510468A patent/JP3117084B2/ja not_active Expired - Lifetime
  • 1989-09-28 EP EP89911218A patent/EP0436629A1/de not_active Withdrawn
  • 1989-09-28 WO PCT/US1989/004248 patent/WO1990003410A1/en not_active Application Discontinuation
  • 1989-09-28 KR KR1019900701117A patent/KR0160102B1/ko not_active IP Right Cessation
  • 1989-09-28 AU AU43401/89A patent/AU4340189A/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events