Claims
- 1. A process for increasing the molecular weight and/or viscosity of a polyester or a copolyester, which process comprisesheating in a mixer or extruder a polyester or a copolyester to the melting point or up to 50° C. above the melting point or 50° C. to 150° C. above the glass transition point of the polyester or copolyester, with the addition of at least one aromatic dicyanate and at least one further compound selected from the group consisting of the sterically hindered hydroxyphenyl-alkyl-phosphonic esters or monoesters, and secondary aromatic amines, wherein the polyester or copolyester remains in the thermoplastic state after the process.
- 2. A process according to claim 1, wherein at least one difunctional epoxide is additionally employed.
- 3. A process according to claim 2, wherein the difunctional epoxide is a compound which contains epoxide radicals of the formula V which are attached directly to carbon, oxygen, nitrogen or sulfur atoms and in which R61 and R63 are both hydrogen, R62 is hydrogen or methyl and m is 0; or in which R61 and R63 together are —CH2CH2— or —CH2CH2CH2—, R62 is then hydrogen and m is 0 or 1.
- 4. A process according to claim 2, wherein the difunctional epoxide is an epoxide of bisphenol A diglycidyl ether or bisphenol F diglycidyl ethers.
- 5. A process according to claim 2, wherein from 0.01 to 5 parts by weight of the difunctional epoxide are employed per 100 parts by weight of the polyester or copolyester.
- 6. A process according to claim 1, wherein the polyester or copolyester is a recyclate.
- 7. A process according to claim 1, wherein the aromatic dicyanate is a compound of the formula I in whichX is a direct bond, oxygen, sulfur, —SO—, —SO2—, C2-C18alkylene, C2-C18alkenylene or R1, R2, R3 and R4 independently of one another are hydrogen, C1-C25alkyl, C5-C12cycloalkyl, unsubstituted or C1-C4alkyl-substituted phenyl; C7-C9phenylalkyl, hydroxyl, C1-C25alkoxy or —O—CN, with the proviso that at least one of the radicals R1, R2, R3 and R4 is —O—CN, R5, R6, R7 and R8 independently of one another are hydrogen, C1-C25alkyl, C5-C12cycloalkyl, unsubstituted or C1-C4alkyl-substituted phenyl; C7-C9phenylalkyl, hydroxyl, C1-C25alkoxy or —O—CN, with the proviso that at least one of the radicals R5, R6, R7 and R8 is —O—CN, R9 and R10 independently of one another are hydrogen, C1-C12alkyl, trifluoromethyl or phenyl, or R9 and R10, together with the carbon atom to which they are attached, form a C5-C8cycloalkylidene ring which is unsubstituted or is substituted by 1 to 3 C1-C4alkyls; and R11 is hydrogen or C1-C12alkyl.
- 8. A process according to claim 7, whereinX is a direct bond, oxygen, C2-C12alkylene or C2-C12alkenylene, R1, R2, R3 and R4 independently of one another are hydrogen, C1-C18alkyl, C5-C8cycloalky), phenyl, benzyl, C1-C18alkoxy or —O—CN, with the proviso that at least one of the radicals R1, R2, R3 or R4 is —O—CN, R5, R6, R7 and R8 independently of one another are hydrogen, C1-C18alkyl, C5-C8cycloalkyl, phenyl, benzyl, C1-C18alkoxy or —O—CN, with the proviso that at least one of the radicals R5, R6, R7 or R8 is —O—CN, and R9 and R10 independently of one another are hydrogen, C1-C8alkyl, trifluoromethyl or phenyl, or R9 and R10, together with the carbon atom to which they are attached, form a C5-C6cyclo-alkylidene ring.
- 9. A process according to claim 7, whereinR1 and R5 are hydrogen, R2, R4, R6 and R8 are hydrogen or methyl, and R3 and R7 are —O—CN.
- 10. A process according to claim 7, whereinX is a direct bond, R1 is hydrogen, R2 is hydrogen or C1-C4alkyl, R3 is —O—CN, R4 is hydrogen or C1-C4alkyl, R5 is hydrogen, R6 is hydrogen or C1-C4alkyl, R7 is —O—CN, R8 is hydrogen or C1-C4alkyl, and R9 and R10 independently of one another are hydrogen, methyl or trifluoromethyl.
- 11. A process according to claim 7, wherein R1 and R2 are hydrogen, R3 is —O—CN, R4, R5 and R6 are hydrogen, R7 is —O—CN, R8 is hydrogen, and R9 and R10 independently of one another are hydrogen or methyl.
- 12. A process according to claim 1, wherein the further compound is a sterically hindered hydroxyphenyl-alkyl-phosphonic ester or monoester of the formula II in whichR21 is isopropyl, tert-butyl, cyclohexyl or cyclohexyl which is substituted by 1 to 3 C1-C4alkyl groups, R22 is hydrogen, C1-C4alkyl, cyclohexyl or cyclohexyl which is substituted by 1 to 3 C1-C4alkyl groups, 23 is C1-C20alkyl, or unsubstituted or C1-C4alkyl-substituted phenyl or naphthyl, R24 is hydrogen, C1-C20alkyl, unsubstituted or C1-C4alkyl-substituted phenyl or naphthyl; or is Mr+r,Mr+ is an r-valent metal cation, n is 1, 2, 3, 4, 5or6, and r is1, 2 or 3.
- 13. A process according to claim 1, wherein the further compound is a sterically hindered hydroxyphenyl-alkyl-phosphonic ester or monoester of the formula IIa or IIb
- 14. A process according to claim 1, wherein the further compound is a secondary aromatic amine of the formula IV in whichR41 is hydrogen or C1-C25alkyl, R42 is hydrogen, C1-C25alkyl or benzyl, R43 is hydrogen, C1-C25alkyl, C5-C12cycloalkyl, benzyl, α-methylbenzyl or α,α-dimethylbenzyl; or R42 and R43 together form a divalent group R44 is hydrogen, C1-C25alkyl or benzyl, R45 is hydrogen or C1-C25alkyl, R46 is hydrogen, C1-C25alkyl or benzyl, R47 is hydrogen, C1-C25alkyl, C5-C12cycloalkyl, benzyl, α-methylbenzyl, α,α-dimethylbenzyl or or R46 and R47 together form a divalent group R48 is hydrogen, C1-C25alkyl or benzyl, R49 is hydrogen or C1-C25alkyl, and R50 is C5-C12cycloalkyl.
- 15. A process according to claim 1, wherein the further compound is a secondary aromatic amine of the formula IVe.
- 16. A process according to claim 1, wherein from 0.01 to 5 parts by weight of the aromatic dicyanate are employed per 100 parts by weight of the polyester or copolyester.
- 17. A process according to claim 1, wherein from 0.01 to 5 parts by weight of the compounds selected from the group consisting of the sterically hindered hydroxyphenyl-alkyl-phosphonic esters or monoesters, and secondary aromatic amines are employed per 100 parts by weight of the polyester or copolyester.
- 18. A process according to claim 1, wherein the polyester is a polyethylene terephthalate a corresponding recyclate or copolymer thereof.
- 19. A process according to claim 1, wherein the polyester is a polybutylene terephthalate/polycarbonate blend or a blend comprising predominantly polybutylene terephthalate/polycarbonate or a corresponding recyclate or a blend of a recyclate and a virgin polymer component.
Priority Claims (1)
Number |
Date |
Country |
Kind |
393/96 |
Feb 1996 |
CH |
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Parent Case Info
This is a continuation-in-part of application Ser. No. 09/125,178, filed Aug. 12, 1998, now abandoned, which is a 371 of PCT/EP97/00492, filed Feb. 4, 1997.
US Referenced Citations (18)
Foreign Referenced Citations (9)
Number |
Date |
Country |
386358 |
Sep 1990 |
EP |
0386358 |
Sep 1990 |
EP |
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Jun 1994 |
EP |
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Jun 1994 |
EP |
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EP |
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EP |
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Jan 1989 |
JP |
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WO |
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Non-Patent Literature Citations (1)
Entry |
Derwent Abstr. 89-050153 for JP 01006019 (1989). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/125178 |
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US |
Child |
09/703782 |
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US |