| 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
|
| Priority date |
04-01-1993 |
| Country |
US |
| Application number |
08/041700 |
| Provisional filing date |
|
| Complete filing date |
04-01-1993 |
| Publication status |
Yes |
| Publication date |
|
| Publication no |
|
| 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 |
|
| Categories > Industry > other |
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