JPS55122738A - Preparation of oxy-di-phtalic acid and acid anhydride - Google Patents
Preparation of oxy-di-phtalic acid and acid anhydrideInfo
- Publication number
- JPS55122738A JPS55122738A JP2934879A JP2934879A JPS55122738A JP S55122738 A JPS55122738 A JP S55122738A JP 2934879 A JP2934879 A JP 2934879A JP 2934879 A JP2934879 A JP 2934879A JP S55122738 A JPS55122738 A JP S55122738A
- Authority
- JP
- Japan
- Prior art keywords
- phthalic acid
- acid
- nonproton
- anhydride
- polar solvent
- 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.)
- Pending
Links
Abstract
PURPOSE: To obtain the title compound industrially economically with ease useful as a modifier for various kinds of resins, a raw material of heat-resistant polyimide resin, by reacting phthalic acid replaced by a halogen as a raw material with a caustic alkali in a nonproton polar solvent.
CONSTITUTION: A phthalic acid or phthalic anhydride replaced by a halogen at 4-position, e.g., 4-iodinated-phthalic acid, 4-bromo-phthalic anhydride, is reacted with a caustic alkali, e.g., NaOH, in a nonproton polar solvent at 50W200°C, preferably at 90W150°C to give 4, 4'-oxy-di-phthalic acid or acid anhydride. Dimethyl sulfoxide, N,N-dimethylformamide, etc. is used as the nonproton polar solvent. The molar ratio of the phthalic acid replaced at 4-position to the cautic alkali can be varied in a wide range, but the vicinity of the molar ratio of 1/2 is advantageous in respect to yields.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2934879A JPS55122738A (en) | 1979-03-15 | 1979-03-15 | Preparation of oxy-di-phtalic acid and acid anhydride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2934879A JPS55122738A (en) | 1979-03-15 | 1979-03-15 | Preparation of oxy-di-phtalic acid and acid anhydride |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55122738A true JPS55122738A (en) | 1980-09-20 |
Family
ID=12273711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2934879A Pending JPS55122738A (en) | 1979-03-15 | 1979-03-15 | Preparation of oxy-di-phtalic acid and acid anhydride |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55122738A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4697023A (en) * | 1986-10-03 | 1987-09-29 | Occidental Chemical Corporation | Process for the preparation of oxy-diphthalic anhydrides |
US4780544A (en) * | 1986-07-02 | 1988-10-25 | General Electric Company | Method for making oxybisphthalimides |
US4808731A (en) * | 1988-03-04 | 1989-02-28 | General Electric Company | Method for making oxydiphthalic anhydride |
EP0416602A2 (en) * | 1989-09-08 | 1991-03-13 | Bromine Compounds Ltd. | Bis(4-halo-phthalic acid)quarter salts, process for their preparation and their use |
GB2280183A (en) * | 1993-07-20 | 1995-01-25 | Kobe Steel Europ Ltd | Production of polyetherimides |
WO1998027047A1 (en) * | 1996-12-19 | 1998-06-25 | Bromine Compounds Ltd. | Process for the preparation of 4,4'-oxybisphthalic dianhydride |
WO2006062137A1 (en) * | 2004-12-07 | 2006-06-15 | Mitsubishi Chemical Corporation | High-purity oxydiphthalic acid anhydride and process for producing the same |
-
1979
- 1979-03-15 JP JP2934879A patent/JPS55122738A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4780544A (en) * | 1986-07-02 | 1988-10-25 | General Electric Company | Method for making oxybisphthalimides |
US4697023A (en) * | 1986-10-03 | 1987-09-29 | Occidental Chemical Corporation | Process for the preparation of oxy-diphthalic anhydrides |
US4808731A (en) * | 1988-03-04 | 1989-02-28 | General Electric Company | Method for making oxydiphthalic anhydride |
EP0416602A2 (en) * | 1989-09-08 | 1991-03-13 | Bromine Compounds Ltd. | Bis(4-halo-phthalic acid)quarter salts, process for their preparation and their use |
EP0416602B1 (en) * | 1989-09-08 | 1995-03-29 | Bromine Compounds Ltd. | Bis(4-halo-phthalic acid)quarter salts, process for their preparation and their use |
GB2280183A (en) * | 1993-07-20 | 1995-01-25 | Kobe Steel Europ Ltd | Production of polyetherimides |
WO1998027047A1 (en) * | 1996-12-19 | 1998-06-25 | Bromine Compounds Ltd. | Process for the preparation of 4,4'-oxybisphthalic dianhydride |
WO2006062137A1 (en) * | 2004-12-07 | 2006-06-15 | Mitsubishi Chemical Corporation | High-purity oxydiphthalic acid anhydride and process for producing the same |
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