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
  • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
  • C08G64/20—General preparatory processes
  • C08G64/30—General preparatory processes using carbonates
  • C08G64/307—General preparatory processes using carbonates and phenols

Definitions

• This invention relates to the preparation of stable, homogeneous melt solutions useful for the preparation of homopolycarbonates and copolycarbonates.
• Polycarbonates are widely used, "relatively low cost thermoplastics esteemed for their combination of clarity, toughness, heat resistance and moldability.
• the most widely used polycarbonate is bisphenol A polycarbonate, hundreds of millions of pounds of which are manufactured and sold annually on a world wide basis.
• Polycarbonates both homopolycarbonates and copolycarbonates, are advantageously prepared in the absence of a solvent in what is sometimes referred to as the "melt process" in which a diaryl carbonate and one or more bisphenols are heated in a molten state in the presence of a transesterification catalyst.
• This melt method offers certain advantages over the widely used interfacial method of polycarbonate preparation which employs a solvent, typically methylene chloride.
• Methylene chloride is a low boiling chlorinated hydrocarbon and its use necessitates costly engineering measures to prevent its adventitious introduction into the environment.
• the melt process as a general proposition is less demanding with respect to controlling emissions since no solvent is involved and the only major volatile byproduct produced, phenol, is quite high boiling (bp 182°C) and is thus less difficult to contain using ordinary engineering means, such as water cooled condensers.
• the melt process suffers several disadvantages however, chief among them is the need to heat the reactants to relatively high temperatures 250-320°C under low pressure, about 180 to about 0.1 mbar.
• the use of high temperatures is nearly always accompanied by unwanted side reactions which take place during the polymerization reaction.
• Most notable among unwanted side reactions taking place in the melt process is the Fries reaction.
• the presence of Fries reaction products in the product polycarbonate may negatively impact the color, stability and flow properties of the product polycarbonate.
• the present invention provides a method of forming a stable, homogeneous melt solution, said method comprising:
• preparing a mixture comprising at least one diaryl carbonate, at least one first dihydroxy aromatic compound having a melting point of greater than 200°C, a catalytically effective amount of at least one transesterification catalyst, and optionally one or more second dihydroxy aromatic compounds having a melting point less than 200°C, said mixture having a total number of moles of said first and second dihydroxy aromatic compounds combined; and heating said mixture at a temperature of 200°C or lower to provide a stable, homogeneous melt solution.
• the present invention relates to the use of stable, homogeneous melt solutions in the preparation of copolycarbonates.
• copolycarbonate refers to polycarbonates incorporating structural units derived from at least two dihydroxy aromatic compounds and includes copolycarbonates and polyester carbonates.
• BPA is herein defined as bisphenol A or 2,2-bis(4-hydroxyphenyl)propane.
• copolycarbonate of bisphenol A refers to a copolycarbonate comprising repeat units derived from BPA and at least one other dihydroxy aromatic compound.
• melt polycarbonate refers to a polycarbonate made by a method comprising transesterification of at least one diaryl carbonate with at least one dihydroxy aromatic compound.
• Catalyst system refers to a catalyst or catalysts that catalyze the transesterification reaction of a dihydroxy aromatic compound with a diaryl carbonate in the preparation of melt polycarbonate.
• Catalytically effective amount refers to an amount of a catalyst at which catalytic performance is exhibited.
• dihydroxy aromatic compound means an aromatic compound which comprises two hydroxy groups, for example a bisphenol such as bisphenol A, or a dihydroxy benzene such as resorcinol.
• hydroxy aromatic compound means a phenolic compound, such as phenol or p-cresol comprising a single reactive hydroxy group.
• aliphatic radical refers to a radical having a valence of at least one comprising a linear or branched array of atoms which is not cyclic.
• the array may include heteroatoms such as nitrogen, sulfur and oxygen or may be composed exclusively of carbon and hydrogen.
• aliphatic radicals include methyl, methylene, ethyl, ethylene, hexyl, hexamethylene and the like.
• the carbonyl group of 4,4'dihydroxybenzophenone is an aliphatic radical having a valence of two.
• aromatic radical refers to a radical having a valence of at least one comprising at least one aromatic group.
• aromatic radicals include phenyl, pyridyl, furanyl, thienyl, naphthyl, phenylene, and biphenyl.
• the term includes groups containing both aromatic and aliphatic components, for example a benzyl group.
• the structural unit derived from phathalic anhydride in fluorescein is defined herein as an aromatic radical having a valence of two.
• cycloaliphatic radical refers to a radical having a valance of at least one comprising an array of atoms which is cyclic but which is not aromatic.
• the array may include heteroatoms such as nitrogen, sulfur and oxygen or may be composed exclusively of carbon and hydrogen.
• cycloaliphatic radicals include cyclopropyl, cyclopentyl cyclohexyl, tetrahydrofuranyl and the like.
• Means for preparing the mixture comprising the diaryl carbonate, the first dihydroxy aromatic compound, the transesterification catalyst, and optionally the second dihydroxy aromatic compound are not particularly limited.
• the mixture can be prepared in a batchwise mixing process, for example mixing in a in a Henschel mixer, or in a continuous process, as for example where the components of the mixture are continuously fed to a first heated continuous stirred tank reactor (CSTR) to afford a partially molten mixture which is continuously fed to one or more downstream CSTR's wherein the formation of the stable, homogeneous melt solution is completed.
• CSTR continuous stirred tank reactor
• the partially molten mixture is continuously fed to a second CSTR the output of which is continuously presented to a third CSTR.
• the mixture comprising the diaryl carbonate, the first dihydroxy aromatic compound, the transesterification catalyst, and optionally the second dihydroxy aromatic compound is prepared and heated in the same apparatus, as in, for example, a twin screw extruder being operated at a temperature of less than 200°C into which the first and second dihydroxy aromatic compounds, the transesterification catalyst, and the diaryl carbonate are introduced as solids via the throat of the extruder, the product stable, homogeneous melt solution emerging from the dieface of the extruder after a total residence time within the extruder of about one minute.
• the stable, homogeneous melt solution itself is the product of chemical reaction between the components of the initially formed mixture comprising at least one first dihydroxy aromatic compound having a melting point of greater than 200°C, at least one diaryl carbonate, a catalytically effective amount of at least one transesterification catalyst, and optionally one or more second dihydroxy aromatic compounds having a melting point of less than 200°C.
• Basic thermodynamics instructs that this product of chemical reaction between the diaryl carbonate, and the first and second dihydroxy aromatic compounds mediated by the transesterification catalyst may be either a product of "partial" or "complete” reaction between the components of the mixture.
• the stable, homogeneous melt solution is the product of "complete” reaction between the components of the mixture it is said to be “fully equilibrated” meaning that for a given temperature no further change in the composition of the melt solution will occur regardless of how long it is heated.
• the composition of a fully equilibrated homogeneous melt solution is the equilibrium composition and is stable with respect to further changes in the composition of the melt solution.
• melt solution prepared from 1 mole of diphenyl carbonate, 0.2 moles of 4,4'-biphenol (melting point (mp) 282-284°C), and 1 x 10 "5 moles of tetrabutylphosphonium acetate comprises unreacted diphenyl carbonate, phenol byproduct, and the bisphenyl carbonate of 4,4'-biphenol as well as other chemical reaction products, the relative amounts of said unreacted diphenyl carbonate, said phenol by-product, said bisphenyl carbonate of 4,4'-biphenol and said other chemical reaction products remaining constant over time.
• a fully equilibrated melt solution at a given temperature prepared according to the method of the present invention is stable with respect to changes in its composition because it is at equilibrium, but it is also stable with respect to resolidification of the melt solution or precipitation of individual components from the melt solution.
• the stable, homogeneous melt solution is the product of incomplete chemical reaction between the components of the mixture. In such instances the melt solution at a given temperature is still subject to changes in composition because the rates of chemical reactions which are transformative are higher than the rates of chemical reactions which are restorative.
• melt solution is "stable” with respect to resolidification of the melt solution or precipitation of individual components from the melt solution. As noted above, it is not stable with respect to changes in the composition of the melt solution as the underlying chemical reactions progress toward equilibrium.
• melt solutions The stable, homogeneous melt solutions prepared by the method of the present invention are termed “melt solutions” because they are free flowing homogeneous liquids at temperatures below 200°C. Although termed “solutions”, there are no exogenous solvents present. In certain instances, as in fully equilibrated systems in which the molar amounts of diaryl carbonate and first and second dihydroxy aromatic compounds are about equal, the system can be thought of as generating its own solvent, the by-product hydroxy aromatic compound.
• Such a stable, homogeneous melt solution at about 200°C may comprise up to about 40 percent by weight phenol, the by-product hydroxy aromatic compound, which acts as a solvent.
• the stable, homogeneous melt solutions display enhanced stability with respect to changes in the color of the melt solution relative to melt solutions prepared using an alkali metal hydroxides, for example sodium hydroxide, as the transesterification catalyst.
• a “stable, homogeneous melt solution” is a melt solution which may or may not be at “fully reacted” but which is stable with respect to resolidification of the melt solution and precipitation of individual components from the melt solution.
• Diaryl carbonates used according to the method of the present invention include diaryl carbonates having structure I
• R is independently at each occurrence a halogen atom, nitro group, cyano group, C]-C 20 alkyl group, C]-C 20 alkoxy carbonyl group, C 4 -C 0 cycloalkyl group, or C 6 -C 20 aryl group; and p and q are independently integers 0-5.
• Diaryl carbonates exemplified by diphenyl carbonate, bis(4-methylphenyl) carbonate, bis(4-chlorophenyl) carbonate, bis(4-fluorophenyl) carbonate, bis(2-chlorophenyl) carbonate, bis(2-fluorophenyl) carbonate, bis(4-nitrophenyl) carbonate, bis(2- nitrophenyl) carbonate, bis(methyl salicyl) carbonate, and methyl salicyl phenyl carbonate.
• first dihydroxy aromatic compound used according to the method of the present invention has a melting point greater than 200°C, preferably in a range between about 205°C and about 325°C.
• First dihydroxy aromatic compounds which may be used according to the method of the present invention include bisphenols having structure II
• R 2 is independently at each occurrence a halogen atom, nitro group, cyano group, C 1 -C 20 alkyl group, C 4 -C 2 o cycloalkyl group, or C 6 -C 2 o aryl group; n and m are independently integers 0-4; and W is a bond, an oxygen atom, a sulfur atom, a SO 2 group, a C 1 -C 20 aliphatic radical, a C 6 -C 20 aromatic radical, a C 6 -C 2 o cycloaliphatic radical, or the group
• R 3 and R are independently a hydrogen atom, C].C 20 alkyl group, C 4 .C 20 cycloalkyl group, or -C 20 aryl group; or R 3 and R 4 together form a C 4 .C 20 cycloaliphatic ring which is optionally substituted by one or more C ⁇ _C 2 o alkyl, C 6 -C 20 aryl, C .C 2 ⁇ aralkyl, C 5 .C 20 cycloalkyl groups, or a combination thereof;
• R 5 is independently at each occurrence a halogen atom, nitro group, cyano group, C]-C 2 o alkyl group, C 4 -C 20 cycloalkyl group, or C 6 -C 20 aryl group; u and v are independently integers 0-3; and
• R 6 and R 7 are independently at each occurrence a halogen atom, nitro group, cyano group, C ⁇ -C 2 o alkyl group, C 4 -C 20 cycloalkyl group, or C 6 -C 20 aryl group; y is independently an integer 0-3, and z is independently an integer 0-4.
• Bisphenols having structure II are illustrated by 4,4'-biphenol; 4,4'-sulfonyldiphenol; 4,4'-sulfonylbis(2-methylphenol); 4,4'-dihydroxybenzophenone; fluorescein; and 4,4'-(9-fluorenylidene)diphenol.
• Spirocyclic bisphenols having structure III are illustrated by 6,6'-dihydroxy-3,3,3',3'- tetramethylspirobiindane; 5,5' -difluoro-6,6 ' -dihydroxy-3 ,3 ,3 ' ,3 ' - tetramethylspirobiindane; 6,6'-dihydroxy-3,3,3 ',3 ' ,5,5 '-hexamethylspirobiindane; and 6,6'-dihydroxy-3,3,3',3'5,5,',7,7'-octamethylspirobiindane.
• Binaphthols having structure IV are illustrated by l,l'-bi-2-naphthol; (R)-(+)-l,l '-bi- 2-naphthol; and (S)-(-)-l,l'-bi-2-naphthol.
• the mixture from which the stable, homogeneous melt solutions are prepared according to the method of the present invention may also comprise a "second dihydroxy aromatic compound" which may be any dihydroxy aromatic compound having a melting point less than 200°C.
• the optional second dihydroxy aromatic compound is a bisphenol having structure V
• R is independently at each occurrence a halogen atom, nitro group, cyano group, C ⁇ -C 20 alkyl group, C 4 -C 20 cycloalkyl group, or C 6 -C 20 aryl group; b and c are independently integers 0-4; and W is a bond, an oxygen atom, a sulfur atom, a SO 2 group, a C]-C 0 aliphatic radical, a C 6 -C 2 o aromatic radical, a C 6 -C 2 o cycloaliphatic radical, or the group
• R 9 and R 10 are independently a hydrogen atom, C ⁇ _C 20 alkyl group, C 4 .C 20 cycloalkyl group, or C 4 _C 2 o aryl group; or R 9 and R 10 together form a C 4 .C 20 cycloaliphatic ring which is optionally substituted by one or more C ⁇ -C 2 o alkyl, C 6 .C 2 o aryl, C 5 .C 2 i aralkyl, C 5 .C 20 cycloalkyl gi'oups, or a combination thereof.
• Bisphenols having structure V are illustrated by bisphenol A; 2,2-bis(4-hydroxy-3- methylphenyl)propane; 2,2-bis(3-chloro-4-hydroxyphenyl)propane; 2,2-bis(3-bromo- 4-hydroxyphenyl)propane; 2,2-bis(4-hydroxy-3-isopropylphenyl)propane; 1 , 1 -bis(4- hydroxyphenyl)cyclohexane; 1 , 1 -bis(4-hydroxy-3-methylphenyl)cyclohexane; and l,l-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane.
• Bisphenol A is frequently preferred.
• the transesterification catalyst used according to the method of the present invention may be any catalyst capable of effectively catalyzing the transesterification reaction between a dihydroxy aromatic compound and a diaryl carbonate.
• Transesterification catalysts which may be used advantageously according to the method of the present invention include quaternary ammonium compounds, quaternary phosphonium compounds, or mixtures thereof.
• Quaternary ammonium compounds, quaternary phosphonium compounds, and mixtures thereof may be used in combination with other transesterification catalysts such as metal hydroxides such as sodium hydroxide, salts of carboxylic acids such as sodium acetate, salts of sulfonic acids such as sodium methane sulfonate, salts of nonvolatile acids such as dipotassium hydrogenphosphate (K 2 HPO 4 ), and salts of mixed alkali metal phosphates such as CsNaHPO 4 .
• metal hydroxides such as sodium hydroxide
• salts of carboxylic acids such as sodium acetate
• salts of sulfonic acids such as sodium methane sulfonate
• salts of nonvolatile acids such as dipotassium hydrogenphosphate (K 2 HPO 4 )
• salts of mixed alkali metal phosphates such as CsNaHPO 4 .
• R -R are independently a C ⁇ _C 2 o aliphatic radical, .C 20 cycloaliphatic radical, or a -C 20 aromatic radical; and X ⁇ is an organic or inorganic anion.
• the anion is selected from the group consisting of hydroxide, halide, carboxylate, phenoxide, sulfonate, sulfate, carbonate, and bicarbonate ions.
• Quaternary ammonium compounds having structure VI are illustrated by tetramethylammonium hydroxide, tetrabutylammonium hydroxide, and the like.
• R 15 -R 18 are independently a C 1 .C 20 aliphatic radical, C .C 2 o cycloaliphatic radical, or a .C20 aromatic radical; and X " is an organic or inorganic anion.
• the anion is selected from the group consisting of hydroxide, halide, carboxylate, phenoxide, sulfonate, sulfate, carbonate, and bicarbonate ions.
• Quaternary phosphonium compounds having structure VII are illustrated by tetramethylphosphonium hydroxide, tetraphenylphosphonium hydroxide, tetraphenylphosphonium acetate, tetramethylphosphonium formate, tetrabutylphosphonium hydroxide, and tetrabutylphosphonium acetate. Tetraphenylphosphonium acetate and tetrabutylphosphonium acetate are frequently preferred.
• the amount of transesterification catalyst employed is in a range between about 1.0 x 10 "8 to about 1.0 x 10 "3 , preferably between about 1.0 x 10 "6 to about 2.5 x 10 "4 moles of catalyst per mole of said first and second dihydroxy aromatic compounds combined. This means that the amount of catalyst is measured relative to the total number of moles of all of the dihydroxy aromatic compounds initially present in the mixture from which the stable, homogeneous melt solution is prepared.
• tetraphenylphosphonium acetate For example, suppose a mixture contains 2 moles of 4,4'-biphenol (the "first dihydroxy aromatic compound”), 5 moles of bisphenol A (the “second dihydroxy aromatic compound”), 7.5 moles of diphenyl carbonate, and a transesterification catalyst, tetraphenylphosphonium acetate. To achieve a catalyst level of between 1.0 x 10 " to about 1.0 x 10 " moles of catalyst per mole of the first and second dihydroxy aromatic compounds combined, tetraphenylphosphonium acetate would be added in an amount corresponding to between about 7.0 x 10 " to about 7.0 x 10 " moles of tetraphenylphosphonium acetate.
• the amount of transesterification catalyst meant by 1.0 x 10 "8 to about 1.0 x 10 " ' moles of catalyst per mole of first and second dihydroxy aromatic compounds combined means that the sum of the number of moles of each individual catalyst (moles Ph 4 POAc + moles NaOH) divided by the sum of the number of moles of all of the dihydroxy aromatic compounds initially present in the mixture from which the stable, homogeneous melt solution is prepared is in a range between about 1.0 x 10 " to about 1.0 x 10 moles of all catalysts per mole of all dihydroxy aromatic compounds initially present in said mixture.
• the transesterification catalyst may comprise one or more alkali metal hydroxides, alkaline earth metal hydroxides, or mixture thereof.
• the transesterification catalyst comprises at least one alkali metal hydroxide, or at least one alkaline earth metal hydroxide.
• the catalyst comprises a metal hydroxide said metal hydroxide is present in an amount corresponding to between about 1 x 10 " and about 1 x 10 " moles of metal hydroxide per mole of all dihydroxy aromatic compounds initially present in the mixture.
• Alkali metal hydroxides are illustrated by lithium hydroxide, sodium hydroxide and potassium hydroxide.
• Alkaline earth metal hydroxides are illustrated by calcium hydroxide and magnesium hydroxide.
• the transesterification catalyst may comprise an alkali metal salt of a carboxylic acid, or an alkaline earth metal salt of a carboxylic acid, or a mixture thereof.
• the transesterification catalyst comprises at least one alkali metal salt of a carboxylic acid, or at least one alkaline earth metal salt of a carboxylic acid.
• the catalyst comprises Na 2 Mg EDTA, a salt of a tetracarboxylic acid (ethylene diamine tetracarboxylic acid) comprising both alkali metal ions (sodium ions) and an alkaline earth metal ion (magnesium ion).
• the transesterification catalyst may comprise one or more salts of a non-volatile inorganic acid.
• the catalyst comprises at least one salt of a non- volatile inorganic acid. Salts of non- volatile inorganic acids are illustrated by NaH 2 PO 3 , NaH 2 PO 4 , Na 2 HPO 3 , KH 2 PO 4 , CsH 2 PO 4 , and Cs 2 HPO
• the transesterification catalyst may comprise one or more mixed alkali metal salts of phosphoric acid.
• mixed alkali metal salts of phosphoric acid include NaKHPO 4 , CsNaHPO 4 , and CsKHPO 4 .
• the stable, homogeneous melt solution prepared according to the method of the present invention is used to prepare a copolycarbonate.
• a stable homogeneous melt solution prepared by heating at a temperature of less than 200°C a mixture comprising at least one diaryl carbonate, at least one first dihydroxy aromatic compound having a melting point of greater than 200°C, a catalytically effective amount of at least one transesterification catalyst, and at least one second dihydroxy aromatic compound having a melting point less than 200°C is introduced into a first continuous stirred tank reactor operated at a temperature in a range between about 220-280°C and a pressure in a range between 180 mbar and 20 mbar.
• the product emerging from the first continuous stirred tank reactor is an oligomeric copolycarbonate having a number average molecular weight, Mn, in a range between about 1000 and about 7500 daltons.
• the oligomeric copolycarbonate is heated at a temperature in a range between about 280 and about 310°C and a pressure in a range between about 15mbar and about 0.1 mbar, to provide a product copolycarbonate having a number average molecular weight , Mn , in a range between about 8,000 daltons and about 50,000 daltons.
• the product copolycarbonate comprises repeat units derived from 4,4'- biphenol and bisphenol A, the relative molar amounts of said repeat units being in a range from about 0.1 to 1 to about 10 to 1.
• Stable, homogeneous melt solutions were prepared in a single neck, round-bottomed flask equipped with a magnetic stir bar. The flask was charged under ambient conditions with diaryl carbonate, a high melting bisphenol, tetrabutylphosphonium acetate catalyst, and optionally bisphenol A, in the molar ratios indicated in Table 1 and in amounts sufficient to produce a total weight of the stable, homogeneous melt solution of between about 5 and about 40 grams.
• the catalyst was added as a solution in water containing about 40 percent by weight tetrabutylphosphonium acetate (TBPA). The volume of the TBPA catalyst solution added was between about 5 and about 30 microliters.
• TBPA tetrabutylphosphonium acetate
• the amount of catalyst employed corresponded to about 2.5 x 10 "4 moles of TBPA catalyst per mole of all bisphenols present in the mixture.
• the flask was then fitted with a standard vacuum adapter the stopcock of which was left in the open position. The interior of the flask was thus maintained at atmospheric pressure throughout the experiment.
• the flask was then lowered into an oil bath preheated to about 200°C and the contents of the flask were observed over a period of about- 10 minutes until a homogeneous melt solution was achieved.
• the melt solution was then stirred at about 200°C for a period of about 1 hour in order to assess the stability of the melt solution. In each of Examples 1-5 the homogeneous melt solution remained unchanged.
• Table 1 The data gathered in Table 1 illustrate the invention.
• the data show that in the absence of additional components stable, homogeneous melt solutions of bisphenol and diphenyl carbonate can be achieved in the presence of a transesterification catalyst when the molar ratio of diphenyl carbonate to 4,4'-biphenol is about 2.22 (Example 1). Lower ratios of diphenyl carbonate to 4,4'-biphenol do not produce homogeneous melt solutions even on prolonged heating in a range from 200 to 205°C. In Comparative Examples 7 and 8 substantial amounts of a low melting additional component were added but no catalyst was included in the mixture.
• Comparative Examples 7 and 8 illustrate the requirement that a transesterification catalyst be present in order to achieve a homogeneous melt and the ineffectiveness of attempting to depress the melting point of the mixture comprising the high melting bisphenol by simply adding phenol. It is worth noting that the levels of phenol employed in Comparative Examples 7 and 8 are similar to the level of phenol expected in a fully equilibrated mixture of the 4,4'-biphenol and diphenyl carbonate. Thus, the attainment of a homogeneous melt solution at a temperature (200°C) substantially below the melting point of 4,4'-biphenol (282-284°C) is shown to be dependent upon chemical reaction between the diaryl carbonate and the high melting bisphenol component.
• Component is the indicated bisphenol having the melting point range given in parentheses, "BP" is 4,4'-biphenol, SBI is 6,6'-dihydroxy-3,3,3',3'- tetramethylspirobiindane, BPS is 4,4'-sulfonyldiphenol.
• c "Additional Component” when present was bisphenol A (BPA, mp 158-9°C) or phenol (mp 40-2°C).
• DAC diaryl carbonate
• HMC High Melting Component
• f Experiment conducted at 205°C. 8 Mixture was judged to be nearly homogeneous after 1 hour at 200°C.
• Example 2 and Comparative Examples 9-11 illustrate the preparation of a stable, homogeneous melt solution from a mixture of bis(methyl salicyl) carbonate (BMSC), 4,4'-biphenol, and a transesterification catalyst, TBPA.
• BMSC bis(methyl salicyl) carbonate
• TBPA transesterification catalyst
• the data reveal that a stable, homogeneous melt solution can be achieved in this three component system, but a substantial amount of BMSC (4.55 molar equivalents relative to the high melting component, 4,4'-biphenol) is required.
• Example 3 reveals that this substantial excess of BMSC can be reduced if an additional component, in this instance BPA, is added to the mixture.
• Examples 4 and 5 illustrate the formation of stable, homogeneous melt solutions of mixtures comprising the bisphenols SBI (mp 212- 215°C) and BPS (mp 245-247°C) respectively as the first dihydroxy aromatic compound, at a temperature substantially below the melting point of the high melting component bisphenol.

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