Claims
- 1. A process for the production of a stabilized polycarbonate which comprises melt-polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a polycondensation catalyst and then, after the reaction mixture shows an intrinsic viscosity of at least 0.1, adding at least one stabilizer selected from the group consisting of
- a compound of the formula (II)
- .sup.+ X.sup.2 --A.sup.2 --Y.sup.1 --SO.sub.3.sup.- (II)
- wherein A.sup.2 is a divalent hydrocarbon group,
- .sup.+ X.sup.2 is a secondary, tertiary or quaternary ammonium cation or a secondary, tertiary or quaternary phosphonium cation, and
- Y.sup.1 is a single bond or an oxygen atom,
- and a compound of the formula (III)
- A.sup.3 --(.sup.+ X.sup.3).sub.n.(R--Y.sup.1 --SO.sub.3.sup.31).sub.n(III)
- wherein A.sup.3 is a hydrocarbon group having a valence of n,
- .sup.+ X.sup.3 is a secondary, tertiary or quaternary ammonium cation or a secondary, tertiary or quaternary phosphonium cation,
- R is a monovalent hydrocarbon group,
- n is an integer of 2 to 4, and
- Y.sup.1 is a single bond or an oxygen atom,
- in an amount of 0.01 to 500 ppm of a polycarbonate to be formed, to form a polycarbonate having a desired intrinsic viscosity.
- 2. The process of claim 1, wherein the stabilizer is a compound of the formula (II).
- 3. The process of claim 2, wherein A.sup.2 in the formula (II) is a divalent saturated aliphatic hydrocarbon group.
- 4. The process of claim 2, wherein .sup.+ X.sup.2 in the formula (II) is a secondary, tertiary or quaternary ammonium cation of the formula (II).sup.-a ##STR43## wherein each of R.sup.9, R.sup.10 and R.sup.11 is independently a hydrogen atom or a monovalent hydrocarbon group, or a phosphonium cation of the formula (II)-b ##STR44## wherein each of R.sup.12, R.sup.13 and R.sup.14 is independently a hydrogen atom or a monovalent hydrocarbon group.
- 5. The process of claim 1, wherein the stabilizer is a compound of the formula (III).
- 6. The process of claim 5, wherein A.sup.3 in the formula (III) is a saturated aliphatic hydrocarbon group, an aromatic hydrocarbon group or a saturated aliphatic-aromatic hydrocarbon group, each of these groups having a valence of n.
- 7. The process of claim 5, wherein .sup.+X.sup.3 in the formula (III) is a secondary, tertiary or quaternary ammonium cation of the formula (II)-a or a phosphonium cation of the formula (II)-b.
- 8. The process of claim 5, wherein R in the formula (III) is an alkyl group, an aryl group or an aralkyl group.
- 9. The process of claim 1, wherein the polycondensation catalyst is selected from the group consisting of an alkali metal compound, an alkaline earth metal compound and a nitrogen-containing basic compound.
- 10. The process of claim 1, wherein the polycondensation catalyst is used in an amount of 0.01 to 100 ppm of the polycarbonate to be formed.
- 11. The process of claim 1, wherein the stabilizer is used in an amount of 0.5 to 50 mols per mole of the polycondensation catalyst.
- 12. The process of claim 1, wherein the stabilizer is added after the polycarbonate shows an intrinsic viscosity of at least 0.2.
- 13. The process of claim 1, wherein the stabilizer is added after the polycarbonate shows an intrinsic viscosity of at least 0.3.
- 14. The process of claim 1, wherein the desired intrinsic viscosity of the polycarbonate to be formed is in the range of from 0.3 to 1.0.
Priority Claims (3)
Number |
Date |
Country |
Kind |
5-211367 |
Aug 1993 |
JPX |
|
5-272263 |
Jan 1993 |
JPX |
|
5-316646 |
Dec 1993 |
JPX |
|
Parent Case Info
This is a divisional application of Ser. No. 08/294,995, filed Aug. 24, 1994 pending.
US Referenced Citations (12)
Foreign Referenced Citations (19)
Number |
Date |
Country |
699456 |
Dec 1964 |
CAX |
0023650 |
Feb 1981 |
EPX |
0382957 |
Aug 1990 |
EPX |
0435124 |
Jul 1991 |
EPX |
0520805 |
Dec 1992 |
EPX |
40-7366 |
Apr 1965 |
JPX |
53-64262 |
Dec 1979 |
JPX |
60-221442 |
Nov 1985 |
JPX |
62-230835 |
Oct 1987 |
JPX |
64-14267 |
Jan 1989 |
JPX |
8929500 |
Jun 1989 |
JPX |
3-081362 |
Apr 1991 |
JPX |
3-81363 |
Apr 1991 |
JPX |
4-1228 |
Jan 1992 |
JPX |
50-9285 |
Jan 1993 |
JPX |
5-17564 |
Jan 1993 |
JPX |
5-171024 |
Jul 1993 |
JPX |
808488 |
Feb 1959 |
GBX |
808489 |
Feb 1959 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
294995 |
Aug 1994 |
|