Record no |
201102173308 |
Activity status |
Dead or Administration by others |
Working Title |
PROCESS FOR THE PREPARATION OF AROMATIC POLYESTERS |
Working Inventors |
BHASKAR B. IDAGE;NAYAKU N. CHAVAN;SUDHAKAR S. MAHAJAN;SWAMINATHAN SIVARAM; |
Contributing institutions |
NCL |
Administered by |
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Ownership |
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Categories > Subjects |
Polymer sciences and engineering |
Categories > Portfolio |
Polymerization/Polymer catalysis |
Disclosure number |
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NCL No |
1991-NCL-0046 |
CSIR No |
1991-NF-0218
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Priority date |
04-01-1993 |
Country |
US |
Application number |
08/041700 |
Provisional filing date |
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Complete filing date |
04-01-1993 |
Publication status |
Yes |
Publication date |
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Publication no |
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Granted number |
5340908 |
Granted date |
08-23-1994 |
Final title |
PROCESS FOR THE PREPARATION OF AROMATIC POLYESTERS |
Final Inventors |
BHASKAR B. IDAGE;NAYAKU N. CHAVAN;SUDHAKAR S. MAHAJAN;SWAMINATHAN SIVARAM; |
Abstract |
This invention relates to a process for the preparation of aromatic polyester s having an intrinsic viscosity greater than 0.4 dL g in chloroform at 30° C. which comprises a reacting diarylesters of tere and isophthalic acid s and dihydric phenol s in the melt phase in an inert atmosphere in the presence of a catalyst selected from alkoxides of Group IV B metals and derivatives of Group IV A metals and in the presence of an organic solvent at a temperature in the range of 100° 300° C. to form a prepolymer having intrinsic viscosity in the range of 0.1 to 0.3 dL g in chloroform at 30° C. b purifying the prepolymer using conventional solvent extraction methods and c Polycondensing the purified prepolymer at a temperature in the range of 300° 350° C. in presence of a catalyst selected from alkoxides of Group IVB metals and derivatives of Group IVA metals under reduced pressure. |
Case status |
Granted + Allowed to lapse |
Licensing status |
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Licensing case no |
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Client name |
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Lead inventors |
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Categories > Industry > Primary |
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Categories > Industry > other |
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