Classifications

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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
• • 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
  • C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
  • C08G75/12—Polythioether-ethers
• • 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
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/52—Polythioethers
• • 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
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
  • C08G59/22—Di-epoxy compounds
  • C08G59/30—Di-epoxy compounds containing atoms other than carbon, hydrogen, oxygen and nitrogen
  • C08G59/302—Di-epoxy compounds containing atoms other than carbon, hydrogen, oxygen and nitrogen containing sulfur
• • 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
• • 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
  • C08G65/48—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
  • C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
  • C08G75/02—Polythioethers
• • 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
  • C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
  • C08G75/02—Polythioethers
  • C08G75/0204—Polyarylenethioethers
  • C08G75/0245—Block or graft polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins

Definitions

• the hydroxyl groups on the dihydric alcohols have lower activity towards condensation than the hydroxyl groups on thiodiglycol the condensation is irregular and/or incomplete which causes the reaction product to have a very wide molecular weight distribution which is undesirable.
• the dihydric alcohols are non-sulfur containing and therefore incorporation of these non-sulfur containing monomers in the polymer backbone significantly reduces the solvent and fuel resistance of the resulting polymer.
• the prior art polythioethers are also crystallizing products which, even if liquid or semi-liquid at ambient temperatures, when they are cooled sufficiently to solidify will not return to their previous liquid state even when the temperature is raised to ambient.
• liquid, non-crystallizing polythioethers having a water, solvent, fuel and temperature resistant backbone. It is a further object of the present invention to disclose and provide relatively high molecular weight liquid polythioethers which are water, solvent, fuel and temperature resistant.
• Still a further object of the present invention is to disclose liquid, non-crystallizing polythioethers which have a water, solvent, fuel and temperature resistant backbone and terminating chemically non-reactive radicals.
• Another and further object of the present invention is to disclose and provide liquid, non-crystallizing polythioethers which are vulcanizable to elastomers which are water, solvent, fuel and temperature resistant and exhibit elastomeric properties over a wide range of temperatures.
• n is from 8 to 200; p is 0 or 1; and each of R 1 , R 2 , R 3 and R 4 is hydrogen or lower alkyl (preferably methyl) with the provision that the total number of R 1 , R ? , R 3 and/or R 4 which are lower alkyl in said polymeric backbone is sufficient to render said backbone non-crystallizing .
• the total number of R 1 , R 2 , R 3 , and/or R 4 which are lower alkyl in said polymeric backbone is at least the nearest whole number to the quotient of n/5 , preferably n/4.
• n/4 when n is 8 at least two of R 1 , R 2 , R 3 or R 4 would be lower alkyl in the polymeric backbone.
• n when n is, for example, 200 at least about 50 of R 1 , R 2 , R 3 and/or R 4 would be lower alkyl in the polymeric backbone which could be accomplished (1) by having R 1 and R 4 both lower alkyl in at least about 12% to 13% of the units or groups or (2) by having R. lower alkyl in at least about 25% of the units or groups.
• the resulting polymeric backbone is non-crystallizing.
• the polymeric backbone may be terminated with any type of terminating radical providing that said radical does not substantially reduce the water, solvent, fuel and temperature resistance of the liquid polythioether polymer.
• the number of such terminating radicals on the non-crystallizing liquid polythioether conveniently ranges from 2 to 4 but may be higher than 4 depending on the molecular weight and branching of the polymer.
• Such terminating radicals include vulcanizable radicals, for example rocm or low temperature vulcanizable radicals, as well as chemically non-reactive radicals.
• liquid polythioethers having terminating vulcanizable radicals such liquid polythioethers may be cured or vulcanized to solid polythioether elastomers which are water, solvent, fuel and temperature resistant and exhibit elastomeric properties over a wide range of temperatures.
• solid polythioether elastomers which are water, solvent, fuel and temperature resistant and exhibit elastomeric properties over a wide range of temperatures.
• such liquid polythioethers may be used as plasticizers, dielectric fluids, high temperature lubricants and non-curing sealants.
• non-crystallizing liquid polythioethers of this invention will in general have a molecular weight of at least about 900 to as high as about 25,000, the particular molecular weight desired being a matter of choice.
• non-crystallizing we mean a polymer which is liquid at ambient and is not a semi-crystalline wax, gum or solid. Moreover, the noncrystallizing polymer, even when cooled to a sufficiently low temperature to become a solid, will be an amorphoussolid which, when the temperature is raised to ambient, will return to the liquid state.
• liquid polythioethers of the present invention will be made by condensing one or more betathioether diols.
• beta-thioether diol we mean a thioether diol wherein each hydroxyl group in the diol is located beta to a sulfur atom, i.e. each hydroxyl group will be separated from a sulfur atom by two carbon atoms.
• a certain percentage, ranging up to 100 mole %, of the starting beta-thioether diols will have at least one (preferably one or two) branched lower alkyl, i.e.
• betathioether diols there will be a lower alkyl group (preferably a merhyl group) attachedto at least one of the two carbon atoms separating the sulfur and hydroxyl groups so that at least one of said hydroxyl groups will have a lower alkyl group located alpha or beta to said hydroxyl group.
• betathioether diols will be referred to as "substituted betathioether diols”.
• the substituted beta-thioether diol may be the only beta-thioether diol used in the condensation reaction which produces the liquid polythioether backbone but there may also be used an "unsubstituted beta-thxoether diol" by which we mean a beta-thioether diol wherein the two carbon atoms separating the sulfur and hydroxyl groups are unsubstituted, i.e. have the structure of HO-CH 2 -CH 2 -S-.
• the preferred unsubstituted beta-thioether diol is thiodiglycol, bis (beta-hydroxyethyl) sulfide.
• the amount of substituted beta-thioether diol in the condensation reaction may be 100% but may be less. However, the least amount of substituted beta thioether diol which may be used must be sufficient to render the resulting liquid polythioether non-crystallizing. in general, the number of branched alkyIs present in the liquid polythioether will be the quotient of n/5 or, preferably, n/4 where n has the same meaning as before.
• the liquid polythioethers of the present invention may be either linear or branched. In order to provide a linear polythioether all that is necessary is to condense the beta-thioether diols referred to above.
• a non-crystallizing water, solvent, fuel and temperature resistant linear polymeric backbone having two terminating hydroxyl groups or radicals thereon, such terminating hydroxyl groups being terminating vulcanizable groups.
• the resulting linear liquid polythioether having the two terminating hydroxyl radicals may be vulcanized to a solid elastomer at either low or high temperatures.
• terminating radicals such as terminating vulcanizable radicals
• they may be added by including a condensable organic compound having a terminating radical in the initial condensation reaction with the beta-thioether diol.
• other terminating radicals including terminating chemically n ⁇ n-reactive radicals as well as terminating vulcanizable radicals, may be added after formation of the hydroxyl terminated linear liquid polythioether by reacting such linear polythioether with an organic compound having the required terminating radicals as well as radicals reactive with hydroxyl groups.
• a branched liquid polythioether there should also be used as a starting material in the condensation reaction of the beta-thioether diols an organic triol or t ⁇ trol of the formula R(OH) m where m is 3 or 4 and R is any tri- or tetravalent organic radical having no groups reactive with hydroxyl radicals. It is preferred that such triol or tetrol have a molecular weight less than 400 and more preferable that the molecular weight be less than 360.
• R is preferably aliphatic sulfide or hetero aliphatic suifide and more preferably alkyl sulfide or hetero alkyl (e.g.
• the amount of organic triol or tetrol used is not particularly critical. In general it may be said that the amount of organic triol or tetrol used will be between about .1 mole % to 5 mole % based on the total moles of beta-thioether diol.
• each hydroxyl group in the beta-thioether triol or tetrol should be separated from a sulfur atom by two carbon atoms so that the reactivity of the hydroxyl groups in the beta-thioether triol or tetrol is substantially the same as the reactivity of the hydroxyl groups in the beta-thioether diol. Additionally, since the beta-thioether triol or tetrol contains sulfur there is little, if any, loss of fuel and/or solvent resistance in the resulting branched or polyfunctional liquid polythioether of the present invention.
• the condensation reaction between the beta-thioether diol and organic triol and/or tetrol will, depending on the relative amounts of the starting materials, produce a mixture of polymers, some having a functionality of 2 (i.e. linear polymers), and some having a functionality of greater than two.
• the resulting mixture taken as a whole, may have a functionality of slightly greater than 2 (e.g. 2.05) to as high as about 4.
• One skilled in the art may vary the functionality of the mixture of polymers by varying the relative amounts of starting materials to produce a mixture having physical properties, etc. which are desired.
• the non-crystallizing liquid polythioethers formed by the condensation reactions referred to above have 2 to 4 terminating vulcanizable radicals, i.e. hydroxyl groups.
• the liquid polythioethers of the present invention may have other terminating radicals such as terminating chemically non-reactive radicals.
• Such liquid, polythioethers having terminating chemically non-reactive radicals may be formed in situ by including in the condensation reaction an organic compound which is chemically non-reactive except for a condensable radical (e.g. a hydroxyl radical) which will react with the hydroxyl groups in the beta-thioether diols during the condensation reaction thereby forming a liquid polythioether which is terminated with the chemically non-reactive radical of said organic compound, which will hereinafter be referred to as a "condensable, non-reactive organic compound".
• a condensable radical e.g. a hydroxyl radical
• the terminal chemically non-reactive radicals may be introduced after formation of the hydroxyl terminated liquid polythioether by reaction with an organic compound which has a radical reactive with said terminal hydroxyl groups (hereinafter referred to as hydroxyl reactive organic compound).
• This hydroxyl reactive organic compound may have, as the only reactive group, a group which is reactive with hydroxyl, the remainder of the compound being chemically non-reactive, in which event there is formed a liquid polythioether terminated with chemically non-reactive radicals.
• the hydroxyl reactive organic compound may be difunctional, i.e.
• a reactive functional group in addition to the hydroxyl reactive group , in which case there is formed a liquid polythioether terminated with reactive functional groups , to which may be added an organic compound which has, as the only reactive group, a group which will react with said reactive fur-ctional groups, the rsiainder of the c ⁇ rcound being chemically non-reactive thereby forming a noncrystallizing reactive radical.
• the non-crystaIlizing water, solvent, fuel and temperature resistant linear liquid polythioethers of the present invention will have 2 terminating radicals and the branched liquid polythioethers will have 3 to 4 terminating radicals , said terminating radicals not substantially reducing the water , solvent, fuel and temperature resistance of the liquid polythioether.
• the terminating radicals will include, inter alia, chemically non-reactive radicals as well as vulcanizable radicals such as low temperature vulcanizable radicals. It should be noted that by "low temperature” we mean a radical which is vulcanizable at a temperature of less than about 150°P. and preferably less than about 100°F..
• the condensation of the betathioether diol, triol or tetrol and, if desired, the aforesaid organic compound having a condensable group is accomplished by methods known in the art and therefore, again, no detailed exemplification thereof is necessary to teach those skilled in the art how to accomplish the condensation reaction.
• the reactants are mixed with a suitable etherifying catalyst and heated until water splits off which is then allowed to vaporize until such point in time as is necessary to pull a vacuum to remove the last traces of water. This is continued until the desired polymeric length is obtained which can be determined, for example, by determining the hydroxyl number in the reaction mixture.
• the temperature at which the condensation reaction takes place may vary widely but in general is between 150°C. and 200°C. but below the boiling point of the reaction mixture.
• the etherification catalysts used in the present invention are esters or hemi-esters of phosphorous acid.
• the preferred catalyst of the present invention is triphenyl phosphite. We have found that this catalyst produces excellent results, giving liquid polymers with narrower molecular weight distributions and less by-products.
• the organic triol or tetrol be a beta-thioether triol or tetrol since if used it will be included in the initial condensation reaction.
• the preferred beta-thioether triols and tetrols will have a molecular weight less than 360, have from 6 to 16 carbon atoms, have from 2 to 6 sulfur atoms, contain no groups or atoms which are reactive with hydroxyl groups (other than the three or four reactive hydroxyl groups) and have the formula:
• Y is , each of a and b is 0 or 1 and Z is divalent hetero (lower) aliphatic such as oxy lower aliphatic.
• Z is divalent hetero (lower) aliphatic such as oxy lower aliphatic.
• Such beta-thioether triols and tetrols may be made , for example , by the following reactions :
• beta-thioether diols are, in general, known in the art and will have the following formula:
• R 1 , R 2 , R 3 , R 4 , X and p have the same meaning as indicated hereinbefore.
• each of R 1 , R 2 , R 3 and R 4 is hydrogen and in the case of the substituted beta-thioether diols at least one of R 1 , R 2 , R 3 and R 4 is lower alkyl and preferably methyl and more preferably one or both of R 1 or R 4 are lower alkyl (preferably methyl) and R 2 and R 3 are hydrogen.
• the unsubstituted beta-thioether diols are known in the art and therefore no detailed exemplification thereof is necessary.
• An exemplary unsubstituted beta-thioether diol is thiodiglycol.
• substituted beta-thioether diols are not as well known in the art but either the substituted or unsubstituted beta-thioether diols may be prepared by reacting mercapto-alcohols or dimercaptans with ethylene oxide or lower alkyl substituted epioxides according to the following reactions:
• each of R 5 , R 6 and R 7 is hydrogen or lower alkyl, and X has the same meaning indicated hereinbefore. It should be noted that when R 5 , R 6 and R 7 is hydrogen, unsubstituted betathioether diols are formed and when R 5 , R 6 or R 7 is lower alkyl, substituted beta-thioether diols are formed. Examplary substituted beta-thioether diols are
• the branched chain liquid polythioethers of this invention will preferably have the formula
• R is the fragment or grouping of the organic triol or tetrol R - (OH)m which has no chemically reactive groups other than hydroxyl groups and, in general will have a molecular weight of less than 400 and preferably less than 360 and, preferably, each hydroxyl is located beta to a sulfur atom. Also it is preferable if R has from 6 to 16 carbon atoms and 2 to 6 sulfur at ⁇ ns. It is more preferable if R is aliphatic or hetero aliphatic sulfide, e.g. alkyl or heteroalkyl such as oxyalkyl and contains no reactive radical, and does not substantially reduce the water, solvent, fuel and temperature resistance of the polythioether.
• B is a terminating radical which preferably contains no more than twenty carbon atoms.
• A is a polymeric backbone or chain consisting of repeating units or groups of the formula
• R 1 , R 2 , R 3 , R 4 , X , p , n and m have the sare meaning as indicated hereinbefore .
• the branched chain , non-crystral l i zing liquid polythioether will have the formula
• a is 0 or 1
• b is 0 or 1
• A is a polymeric backbone or chain consisting of repeating units or groups of the formula
• R 1 , R 2 , R 3 , R 4 , X, p, n and a have the same meaning as indicated hereinbefore.
• the preferred linear polythioether of the present invention having two terminating radicals has the formula
• R 1 , R 2 , R 3 , R 4 , X , n , p and 3 have the same meaning as indicated before .
• the type of terminating radical on the liquid polythioethers is not important providing they do not substantially reduce the very desirable properties of the unique backbone of this invention, said properties including water, solvent, fuel and temperature resistance.
• the non-crystallizing liquid polythioethers may be used wherever a polymer having such properties are useful.
• the terminal radicals will be terminating vulcanizable radicals and if room or low temperature vulcanizable elastomers are desired such Vulcanizable radicals will be low temperature vulcanizable radicals.
• Such vulcanizable radicals, including low temperature ones, are known in the art and therefore "B" in the previous formulas may include epoxide, reactive silyls, isocya-nate, reactive olefinic double bond, mercaptan or is hydrogen of a hydroxyl.
• the polythioethers of the present invention terminated with 2 to 4 hydroxyl groups are made by condensing the beta-thioether diol per se or with the organic triol or tetrol.
• Polythioethers having other vulcanizable radicals are also easily made.
• liquid polythioethers which have reactive olefinic double bonds may be made by adding to the condensation reaction a compound having the formula:
• HO-CH 2 -CH 2 -S-R'-CH CH 2 wherein R' is alkylene of 4 to 6 carbon atoms.
• Liquid polythioethers having terminating mercaptan radicals may be produced by reacting the polythioethers terminated with olefinic double bonds with an organic compound having two terminal mercaptan groups in the presence of an appropriate catalyst, e.g. a free radical initiating catalys t such as a peroxide and an amine having a pK b of 6 or less as disclosed in U . S . Patent 3 , 923 , 748 issued December 2 , 1975 .
• an appropriate catalyst e.g. a free radical initiating catalys t such as a peroxide and an amine having a pK b of 6 or less as disclosed in U . S . Patent 3 , 923 , 748 issued December 2 , 1975 .
• the dimercaptan c ⁇ pounds may have the formula R" (SH) 2 wherein R" is a divalent organic radical such as alkyl, aryl ether, alkyl ether, and the thioether thereof.
• R" is a divalent organic radical such as alkyl, aryl ether, alkyl ether, and the thioether thereof.
• Examplary of such dimercaptan compounds, though not limited thereto are beta, beta'-dimercapto diethyl ether, beta, beta'-dimercapto diethyl sulfide, 1,6-dimercapto hexane and p,p'-dimercapto methyl, diphenyl oxide.
• the liquid polythicethers having terminating epoxide radicals may be made by reacting the hydroxyl terminated polythioethers with a diepoxide compound such as bisphenol A diglycidyl ether in the presence of an appropriate catalyst.
• liquid polythioethers having terminating isocyanate radicals may easily be produced by reacting the hydroxyl terminated polythioethers with an organic diisocyanate such as toluene diisocyanate.
• the tarminating reactive silyl radicals include hydrolyzable silyls such as lower alkoxy silane (e.g. tri (lower) alkoxy silane), acyloxy silane, silane ⁇ xajces and silane hydrides.
• a reactive silyl termination may be made by reacting a mercapto silane with the olefin terminated liquid polythioether.
• the foregoing liquid polythioethers having terminating olefin radicals can be vulcanized by mixing therewith a stoichiometric amount of di- or trimercaptan and an appropriate catalyst or by free radical mechanism.
• liquid polythioethers of the present invention having terminating mercaptan vulcanizable radicals may be vulcanized by using an oxidizing agent such as a cichrcmata, an organic peroxide, an inorganic peroxide, a diepoxide, etc.
• an oxidizing agent such as a cichrcmata, an organic peroxide, an inorganic peroxide, a diepoxide, etc.
• the liquid polythioethers having terminating epoxide vulcanizable radicals may be vulcanized by using a di- or triamine or a di- or trimercaptan.
• the vulcanized products made from such liquid polythioethers will be solid polyithicether elastomers, the vulcanization, in general taking place after application of the liquid polythioether to the desired place, such application being by pouring, brushing, spraying, etc.
• the liquid polythioether may also be mixed with, prior to vulcanization, various additives such as plasticizers, fillers, colorants, and other monomeic or polymeric compounds in order to give the vulcanized polythioether certain desired properties known in the art.
• cure times and rates nay be altered by adding other catalysts, reactants, etc. during vulcanization.
• redox catalysts such as an iron salt has been found to be of value in vulcanizing the mercaptan terminated polythioethers.
• the non-crystallizing liquid polythioethers may also contain other terminating radicals such as terminating chemically non-reactive radicals.
• terminating chemically non-reactive radicals we mean a radical which is chemically inert or inactive with water and other substances, such as oxygen, generally found in the ambient.
• chemicalIy non-reactive radicals which have a reactivity the same as, or less than the hydrogens on a benzene ring are quite satisfactory.
• Those chemically non-reactive radicals which are suitable for use in the present invention include aromatic, alkyl, heteroalkyl containing one or more heteroatoms (e.g.
• the hetero at ⁇ a. being sulfur and/or oxygen.
• the number of carbon atoms in the chemically non-reactive radical will not exceed about twenty.
• liquid polylthioethers of our invention which have terminating chemically non-reactive radicals are useful for many purposes including plasticizers, dieletric fluids, high temperature lubricants and non-curing sealants, e.g. mastics.
• the non-crystal Sizing liquid polythioethers of the present invention when used as plasticizers they may be compounded with a number of liquid polymers with which they are compatible or miscible and may be added in the same amounts and for the same purpose as any of the common plasticizers.
• the liquid polythioethers having terminating chemically non-reactive radicals of the present invention have all the necessary properties e.g.
• liquid polythioether plasticizers are therefore ideally suited for use with liquid elastomers and, particularly, with fuel, temperature and water resistant elast ⁇ ners which are non-crystallizing, such as the liquid polythioether elastomers of the present invention.
• the liquid polythioethers having terminating chemically non-reactive radicals when used as plasticizers, may be incorporated with thermoplastic or thermosetting polymers.
• the amount of plasticizer used with any given polymer is the same as any other known plasticizer and depends upon the properties desired of the final composition. In general, it may be said that the amount of plasticizer will be between 1 and 50 parts by weight per hundred parts by weight of resin (phr).
• plasticizers are particularly useful when used in conjunction with liquid elastomers such as nitrile rubbers, polysulfides (e.g. Thiokol), etc.
• liquid polythioethers of the present invention having terminating vulcanizable radicals.
• the liquid polythioethers having terminating chemically non-reactive radicals may be easily made following the teachings herein.
• liquid non-crystallizing polythioethers having 2 to 4 terminating thioalkyl radicals may be produced by including in the condensation reaction, a beta thioether alcohol having the formula: wherein R"' is alkyl of, e.g. from six to eight carbon atoms.
• beta thioether alcohols may be made by reacting mercaptoethanol with an alpha-olefin such as alpha-hexene, alpha-heptene or alpha-octene in the presence of a free radical catalyst.
• the aromatic terminated polythioethers may be produced by reacting the hydroxyl terminated polythioethers with para-toluene sulfonyl isocyanate or phenyl isocyanate.
• aromatic terminated polythioethers may be formed by reacting the hydroxyl terminated polythioethers with an aromatic diisocyanate such as toluene-2, 4-diisocyanate and then reacting the resulting isocyanate terminated polythioether with a lower alkyl alcohol.
• Another alternative route to forming liquid polythioethers having terminating chemically non-reactive radicals is to first form polythioethers having terminating reactive radicals other than hydroxyl groups.
• polythioethers having terminating reactive olefinic double bonds may be produced as exemplified hereinbefore.
• Such reactive olefinic double bonds may be converted to chemically non-reactive terminals by reacting the olefin terminated polythioethers with a lower alkyl or aryl mercaptan in the presence of an appropriate catalyst, e.g. a free radical initiating catalyst such as a peroxide and an amine having a pK b of 6 or less as disclosed in U.S. Patent 3,923,748.
• an appropriate catalyst e.g. a free radical initiating catalyst such as a peroxide and an amine having a pK b of 6 or less as disclosed in U.S. Patent 3,923,748.
• Triphenyl phosphite (catalyst) 35. .7 grams
• the above ingredients were mixed in a 4 liter glass reactor fitted with a stirrer, a thermometer and a distillation condenser and heated under a stream of nitro ⁇ en at 130 °C. until the vapor temperature of condensate dropped from initial 120°C. to less than 70°C. At this time vacuum was applied and the reaction of condensation continued at 180°C. until the rate of condensation was negligible as evidenced by collected distillate.
• the polymer obtained was a thick clear brownish liquid with a viscosity of 475 poise and hydroxyl number of 32.
• Ethylene bis hydroxypropyl sulfide (Example 4) 460 grams Triphenyl phosphite 20 grams Thiodiphenol 2.5 grams In a 4 liter glass reactor fitted with stirrer, thermometer and distillation condenser the above ingredients were heated at 180°C. under a stream of nitrogen until the vapor temperature of condensate dropped below 70°C. At this time nitrogen was stopped and full vacuum applied and the remaining reaction carried out until the rate of condensation became negligible. A thick liquid polymer with a viscosity of 530 poise and hydroxyl number 35 was thus obtained.
• HEHS Hydroxyethyl hexyl sulfide
• Double bond terminated polymer 100 grams of Example 3 Dimercaptodiethyl sulfide 8.2 grams T-butyl perbenzoate 0.6 grams Terramethyl guanidine 0.1 grams Procedure: The materials were slowly stirred together (no vortex formed) initially in a lined can or a polyethylene container. The batch was covered and placed in a 158°F. oven for 16 hours without stirring. Analysis of infra red spectrum of the resulting product showed conversion of all olefinic groups. The final product had a viscosity of 470 poise at 79°F. and cured to a tack-free rubber of 42 Rex hardness in 24 hours at room temperature when cured with a lead peroxide paste and to a tack-free rubber of 27 Rex hardness when cured with a MnO 2 accelerator.
• compositions of the MnO 2 accelerator and lead peroxide paste are as follows:
• Example 3 100.0 grams Mercaptopropyl triethoxy silane 10.87 grams Triethylamine 0.40 grams T-butyl perbenzoate 0.60 grams Tetramethyl guanidine 0.10 grams Procedure: All ingredients were gently mixed in a polyethylene cup or a phenolic lined can. The batch was nitrogen blanketed, covered and heated without further stirring at 158 °F. for 16 hours. Analysis of infrared spectrum of resulting material showed conversion of all olefinic groups. The product cured to a soft tack-freerubber when mixed with dibutyl-tin dilaurate and kept overnight at ambient.
• the compounded polymer was mixed intimately with Manganese dioxide accelerator of Example 16 in the weight ratio of 10:1 and cured at ambient in the form of a sheet of approximately 1/8" thickness.
• the following physical properties were obtained:
• MIL-S-8802 was conducted on a specimen cured according to the schedule of the aforesaid military specification (7 days at room temperature followed by 1 day at 140°F.). The specimen performed as follows:
• JRF Jet Reference Fuel
• composition of the Dichromate Accelerator is:
• Double bond terminated polymer of Example 13 100 grams Dimercaptodiethyl sulfide 8.2 grams T-butyl perbenzoate 0.6 grams Tetramethyl guanidine 0.1 grams
• Example 26 The polymer of Example 26 was compounded as follows :
• Mercaptan terminated polymer of Example 26 100 Calcium carbonate 55 Hydrated aluminum oxide 7 . 5 Zinc oxide 3. 0
• Example 27 The compounded polymer of Example 27 was intimately mixed with the manganese dioxide accelerator in the weight ratio of 10:1 and cured at ambient in the form of a sheet of approximately 1/8" thickness. The following physical properties were obtained:
• JRF jet reference fuel

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• Chemical & Material Sciences (AREA)
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• Organic Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
• Sealing Material Composition (AREA)
• Preparation Of Compounds By Using Micro-Organisms (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Polymerisation Methods In General (AREA)
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• 1981
  • 1981-11-25 AU AU79330/82A patent/AU547995B2/en not_active Ceased
  • 1981-11-25 WO PCT/US1981/001573 patent/WO1982001880A1/en unknown
  • 1981-11-25 JP JP57500104A patent/JPH0468330B2/ja not_active Expired - Lifetime
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• 1982
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