JPS56163123A - Polyamic acid solution composition and its preparation - Google Patents
Polyamic acid solution composition and its preparationInfo
- Publication number
- JPS56163123A JPS56163123A JP6715780A JP6715780A JPS56163123A JP S56163123 A JPS56163123 A JP S56163123A JP 6715780 A JP6715780 A JP 6715780A JP 6715780 A JP6715780 A JP 6715780A JP S56163123 A JPS56163123 A JP S56163123A
- Authority
- JP
- Japan
- Prior art keywords
- polyamic acid
- mixed solvent
- acid solution
- diamine
- biphenyltetracarboxylic dianhydride
- 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.)
- Granted
Links
Abstract
PURPOSE: To obtain titled stable composition having a low viscosity at normal temperature and being uniformly coated when applied as a coating varnish, by polymerizing biphenyltetracarboxylic dianhydride with an armoatic diamine in a specified mixed solvent.
CONSTITUTION: A mixed solvent is obtained by mixing (A) 100pts.wt. dioxane, with (B) 35W80pts.wt. dimethylformamide or N-methylpyrrolidone and (C) 0W 75pts.wt. lower alcohol, e.g., methyl alcohol. Next, this mixed solvent is mixed with both biphenyltetracarboxylic dianhydride and an aromatic diamine of the formula I or II, wherein R1 and R2 are each a substituent such as H or a lower alkyl, and A is a bivalent group wuch as -O- or -S-. The resulting mixture is polymerized at 100°C or below for 0.5W30hr to obtain a polyamic acid solution containing 5W40pts.wt. polyamic acid containing at least 80% recurring units represented by formula III, wherein R is a bivalent aromatic residue derived by removing the amino groups from the aromatic diamine.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6715780A JPS56163123A (en) | 1980-05-22 | 1980-05-22 | Polyamic acid solution composition and its preparation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6715780A JPS56163123A (en) | 1980-05-22 | 1980-05-22 | Polyamic acid solution composition and its preparation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56163123A true JPS56163123A (en) | 1981-12-15 |
JPS6337137B2 JPS6337137B2 (en) | 1988-07-22 |
Family
ID=13336772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6715780A Granted JPS56163123A (en) | 1980-05-22 | 1980-05-22 | Polyamic acid solution composition and its preparation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56163123A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59196320A (en) * | 1983-02-25 | 1984-11-07 | ナシヨナル・エアロノ−テイツクス・アンド・スペ−ス・アドミニストレ−シヨン | Polyphenylene ether having imido bound group and manufacture |
JPS6175602A (en) * | 1984-09-21 | 1986-04-18 | Ube Ind Ltd | Dielectric resonator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4912357A (en) * | 1972-03-20 | 1974-02-02 |
-
1980
- 1980-05-22 JP JP6715780A patent/JPS56163123A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4912357A (en) * | 1972-03-20 | 1974-02-02 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59196320A (en) * | 1983-02-25 | 1984-11-07 | ナシヨナル・エアロノ−テイツクス・アンド・スペ−ス・アドミニストレ−シヨン | Polyphenylene ether having imido bound group and manufacture |
JPS6175602A (en) * | 1984-09-21 | 1986-04-18 | Ube Ind Ltd | Dielectric resonator |
Also Published As
Publication number | Publication date |
---|---|
JPS6337137B2 (en) | 1988-07-22 |
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