ES2038072B1 - Procedimiento para la obtencion de polianhidridos a base de acidos dicarboxilicos y anhidrido acetico. - Google Patents
Procedimiento para la obtencion de polianhidridos a base de acidos dicarboxilicos y anhidrido acetico.Info
- Publication number
- ES2038072B1 ES2038072B1 ES9101638A ES9101638A ES2038072B1 ES 2038072 B1 ES2038072 B1 ES 2038072B1 ES 9101638 A ES9101638 A ES 9101638A ES 9101638 A ES9101638 A ES 9101638A ES 2038072 B1 ES2038072 B1 ES 2038072B1
- Authority
- ES
- Spain
- Prior art keywords
- procedure
- obtaining
- reaction
- mixture
- acetic anhydride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
PROCEDIMIENTO PARA LA OBTENCION DE POLIANHIDRIDOS A BASE DE ACIDOS DICARBOXILICOS Y ANHIDRIDO ACETICO. EL PROCEDIMIENTO CONSISTE EN LA REACCION A REFLUJO DE LOS CORRESPONDIENTES DIACIDOS, TALES COMO EL 1,3-BIS(P-CARBOXIFENOXI)PROPANO Y 1,4-BIS(P-CARBOXIFENOXI)BUTANO, CON UN EXCESO DE ANHIDRIDO ACETICO ELIMINANDO SIMULTANEAMENTE POR DESTILACION LA MAYOR PARTE DEL ACIDO ACETICO PRODUCIDO, Y SEPARANDO POR CRISTALIZACION DEL PRODUCTO OBTENIDO AL ENFRIAR LA MEZCLA. LA TEMPERATURA DE REACCION ES LA DE EBULLICION DE LA MEZCLA REACCIONANTE Y EL TIEMPO DE REACCION ESTA COMPRENDIDO ENTRE UNA Y SEIS HORAS. LA VELOCIDAD DE DESTILACION DEL ACIDO ACETICO SE AJUSTA DE MODO QUE AL CABO DEL TIEMPO FIJADO PARA LA REACCION, EL VOLUMEN DE LA MEZCLA REACCIONANTE SE HAYA REDUCIDO A LA MITAD. PARA EVITAR LA DESPOLIMERIZACION DEL POLIMERO FORMADO, SE PURIFICA ESTE POR CRISTALIZACION EN UN DISOLVENTE APROPIADO, PREFERENTEMENTE TOLUENO.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9101638A ES2038072B1 (es) | 1991-07-12 | 1991-07-12 | Procedimiento para la obtencion de polianhidridos a base de acidos dicarboxilicos y anhidrido acetico. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9101638A ES2038072B1 (es) | 1991-07-12 | 1991-07-12 | Procedimiento para la obtencion de polianhidridos a base de acidos dicarboxilicos y anhidrido acetico. |
Publications (2)
Publication Number | Publication Date |
---|---|
ES2038072A1 ES2038072A1 (es) | 1993-07-01 |
ES2038072B1 true ES2038072B1 (es) | 1994-02-16 |
Family
ID=8272993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES9101638A Expired - Fee Related ES2038072B1 (es) | 1991-07-12 | 1991-07-12 | Procedimiento para la obtencion de polianhidridos a base de acidos dicarboxilicos y anhidrido acetico. |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2038072B1 (es) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4757128A (en) * | 1986-08-01 | 1988-07-12 | Massachusetts Institute Of Technology | High molecular weight polyanhydride and preparation thereof |
US4789724A (en) * | 1986-10-17 | 1988-12-06 | Massachusetts Institute Of Technology | Preparation of anhydride copolymers |
US4857311A (en) * | 1987-07-31 | 1989-08-15 | Massachusetts Institute Of Technology | Polyanhydrides with improved hydrolytic degradation properties |
US4868274A (en) * | 1988-05-23 | 1989-09-19 | Hoechst Celanese Corp. | Polyanhydride from carboxy aryloxy alkanoic acid |
US4997904A (en) * | 1989-08-25 | 1991-03-05 | Nova Pharmaceutical Corporation | Aromatic polyanhydride compositions |
-
1991
- 1991-07-12 ES ES9101638A patent/ES2038072B1/es not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ES2038072A1 (es) | 1993-07-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD2A | Announcement of lapse in spain |
Effective date: 20111209 |