Claims
- 1. A process for the preparation of an oxysulfonylated polyester, comprising polycondensing a lower alkyl diester of at least one aliphatic dicarboxylic acid and a lower alkyl diester of at least one aromatic dicarboxylic acid bearing an oxysulfonyl substituent, with at least one diol, in the presence of a catalytically effective amount of at least one titanium alkoxide compound and at least one manganese carboxylate, and in the absence of antimony compounds, wherein said at least one titanium alkoxide compound is present in an amount effective to produce an oxysulfonylated polyester free of a pink or red coloration.
- 2. The process as defined by claim 1, said titanium alkoxide compound comprising a derivative of an alkanol having from 1 to 6 carbon atoms or of an alkanolamine having from 2 to 12 carbon atoms.
- 3. The process as defined by claim 2, said alkanol having from 2 to 4 carbon atoms and said alkanolamine having from 4 to 9 carbon atoms.
- 4. The process as defined by claim 1, said at least one manganese carboxylate comprising an aliphatic carboxylate having from 1 to 6 carbon atoms.
- 5. The process as defined by claim 1, wherein the amount of said at least one titanium alkoxide compound, expressed as weight of titanium relative to the total weight of the diacids and diol introduced, ranges from 0.0002% to 0.0030% of titanium.
- 6. The process as defined by claim 1, wherein the amount of said at least one manganese carboxylate, expressed as weight of manganese relative to the total weight of the diacids and diols introduced, ranges from 0.0020% to 0.0100% of manganese.
- 7. The process as defined by claim 1, wherein said polycondensing step is carried out in the presence of a sodium carboxylate.
- 8. The process as defined by claim 1, carried out at a temperature ranging from 200.degree. C. to 280.degree. C.
- 9. The process as defined by claim 1, wherein said polycondensing step further includes polycondensing a lower alkyl diester of at least one aromatic dicarboxylic acid free of oxysulfonyl substituents.
- 10. The process as defined by claim 9, said aromatic diesters being of an aromatic dicarboxylic acid having the formula (I):
- HOOC--Ar--COOH
- in which Ar is a phenylene radical optionally bearing one or more alkyl radical substituents having from 1 to 4 carbon atoms, halogen atoms or OH radicals, or a combination of a plurality of ortho- or pericondensed phenyl radicals or of a plurality of phenyl radicals bonded together via an inert bridging group.
- 11. The process as defined by claim 1, said oxysulfonylated aromatic diesters being of an oxysulfonylated aromatic dicarboxylic acid having the formula (II): ##STR2## in which M is a hydrogen, sodium, lithium or potassium atom, and Q is a phenylene radical or a combination of a plurality of ortho- or pericondensed phenyl radicals or of a plurality of phenyl radicals bonded together via an inert bridging group.
- 12. The process as defined by claim 11, said oxysulfonylated aromatic dicarboxylic acid comprising 5-sulfoisophthalic acid or alkali metal salt thereof.
- 13. The process as defined by claim 1, said aliphatic diesters being of a saturated aliphatic dicarboxylic acid having from 3 to 12 carbon atoms.
- 14. The process as defined by claim 10, said aliphatic diacid comprising adipic, succinic, sebacic, azelaic, glutaric or suberic acid.
- 15. The process as defined by claim 1, each of said diesters comprising dimethyl diesters.
- 16. The process as defined by claim 1, said at least one diol comprising a saturated aliphatic diol having from 2 to 4 carbon atoms.
- 17. The process as defined by claim 1, wherein the lower alkyl diester(s) of the aromatic diacids constitute from 0 to 95 mol % relative to the total of the diesters introduced, the lower alkyl diester(s) of the aliphatic diacids constitute from 4 to 99 mol % relative to the total of the diesters introduced, and the lower alkyl diester(s) of the oxysulfonylated aromatic diacids constitute from 1 to 30 mol % relative to the total of the diesters introduced.
- 18. The process as defined by claim 1, wherein the diols/diesters molar ratio ranges from 1.5 to 2.5.
- 19. The process as defined by claim 1, wherein said polycondensing occurs such that the oxysulfonated polyester attained has a number average molecular weight of at least 24, 500 and is free of an undesirable pink or red coloration.
- 20. A process for the preparation of an oxysulfonylated polyester, comprising polycondensing a lower alkyl diester of at least one aliphatic dicarboxylic acid and a lower alkyl diester of at least one aromatic dicarboxylic acid bearing an oxysulfonyl substituent, with at least one diol, in the presence of a catalyst consisting essentially of a titanium alkoxide compound, a manganese carboxylate, and optionally a sodium carboxylate; wherein said titanium alkoxide compound is present in an amount effective to produce an oxysulfonylated polyester free of a pink or red coloration.
Priority Claims (1)
Number |
Date |
Country |
Kind |
92 03480 |
Mar 1992 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/034,408, filed Mar. 18, 1993, now abandoned.
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Continuations (1)
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Number |
Date |
Country |
Parent |
34408 |
Mar 1993 |
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