WO1988000178A1 - Aryl-diethers - Google Patents
Aryl-diethers Download PDFInfo
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- WO1988000178A1 WO1988000178A1 PCT/US1986/001387 US8601387W WO8800178A1 WO 1988000178 A1 WO1988000178 A1 WO 1988000178A1 US 8601387 W US8601387 W US 8601387W WO 8800178 A1 WO8800178 A1 WO 8800178A1
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- diether
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/257—Ethers having an ether-oxygen atom bound to carbon atoms both belonging to six-membered aromatic rings
- C07C43/275—Ethers having an ether-oxygen atom bound to carbon atoms both belonging to six-membered aromatic rings having all ether-oxygen atoms bound to carbon atoms of six-membered aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1046—Polyimides containing oxygen in the form of ether bonds in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1046—Polyimides containing oxygen in the form of ether bonds in the main chain
- C08G73/1053—Polyimides containing oxygen in the form of ether bonds in the main chain with oxygen only in the tetracarboxylic moiety
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
- C08G73/1064—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
Definitions
- This invention is directed to aryl-diethers derived from the salts of bisphenol compounds and methods for making poiyetherimides therefrom. More particularly, this invention is directed to aryl-diethers of the formula:
- the divalent radical R, of formula I is an organic radical of the general formula
- Z is a member of the class consisting of divalent
- radicals of the formula -C y H 2y -, and -S-, -O-, and m is 0 or 1
- y is a whole number from 1 to 5
- R' is selected from alkyl radicals of from 1 to 5 carbon atoms.
- a preferred class of aryl-diethers which are included by formula I are those wherein R is
- the aryl-diethers of formulas I-IV can be made by effecting reaction between the salt form of a bisphenol compound and halogenated xylenes.
- the salt form of the bisphenol compound is of the formula:
- R is as previously defined and M is an alkali metal, preferably selected from the group consisting of sodium and potassium.
- the preferred halogenated xylenes are of the formulas
- Q is halogen, most preferably chlorine or bromine.
- halogenated xylenes and salts of bisphenol are reacted in the presence of a copper catalyst, such as a copper (I) salt at a temperature preferably above 100°C. Eguimolar portions of the reagents are generally preferred but an excess of either reactant will also provide good yields of the aryl-diethers.
- a quantity of catalyst of about 1 to 30 mole percent based on halogenated xylenes provides acceptable yields, which often exceed 50%.
- Suitable copper salts are CuBr and CuCl.
- the reaction typically takes place within a dipolar aprotic solvent, which is preferably an amide solvent such as dimethylacetamide, dimethylformamide or N-methyl-2-pyrrolidone. Mixtures of these solvents are suitable as are mixtures which contain other dipolar aprotic solvents. Reaction is most preferably accomplished within the range of about 150° to 200°C for 2-4 hours.
- the reaction products are recovered and purified by conventional techniques. These include ether extractions, distillation and column chromatography.
- halogenated xylenes are readily obtained by halogenation of xylenes as described by Wisansky and
- the salts of bisphenol can be obtained by contacting an organic solution of the corresponding bisphenol compound with an aqueous solution of an alkali metal hydroxide, such as NaOH or KOH.
- an alkali metal hydroxide such as NaOH or KOH.
- An example of a suitable process is disclosed in U.S. 4,492,806; which is incorporated by reference.
- Typical bisphenol compounds include
- bisphenol-A 2,2-bis-(4-hydroxyphenyl)-propane hereinafter identified as "bisphenol-A” or "BPA”;
- Oxidation of the terminal aryl groups can be achieved by aralkyl oxidation methods know to the art, which include reaction with oxygen in the presence of a metal-ion catalyst, such as manganese or cobalt.
- a metal-ion catalyst such as manganese or cobalt.
- Hay discloses a process for reacting in liquid phase the alkyl group of an aralkyl compound with oxygen in the presence of a catalyst consisting essentially of a combination of cobalt, bromine and carboxylic acid at a temperature above 80°C. The contents of the Hay patent are incorporated herein by reference.
- a mixture of products may be obtained by this oxidation reaction, particularly where the divalent organic radical R has alkyl radicals bonded to its aromatic nuclei, as in the preferred species where R is derived from bisphenol-A. Oxidation may take place on these alkyl radicals as well.
- the aryl-diethers in oxidized form can be polymerized to provide poiyetherimides by reaction with an organic diamine of the formula
- R 1 is a divalent organic radical selected from the class consisting of
- 1,2-bis(3-aminopropoxy)ethane 1,2-bis(3-aminopropoxy)ethane; m-xylylenediamine; p-xylylenediamine; bis(4-aminocyclohexyl)methane; decamethylenediamine;
- N-methyl-bis(3-aminopropyl)amine N-methyl-bis(3-aminopropyl)amine; hexamethylenediamine; heptamethylenediamine; 2,4-diaminotoluene; nonamethylenediamine; 2,6-diaminotoluene; bis-(3-aminopropyl)tetramethyldisiloxa etc.
- Polymerization of the oxidized aryl-diethers and diamines can be achieved with or without a solvent. Melt polymerization of the organic diamine can be accomplished at temperatures above about 200°C and preferably less than 350°C. Takekoshi describes suitable melt polymerization processes with greater particularity in U.S. Patent 3,833,546, which is incorporated herein by reference.
- Solution polymerization is often more convenient than melt polymerization in that lower temperatures can be utilized.
- Dipolar aprotic solvents such as dimethyl sulfoxide, N,N-dimethyl acetamide, N-methyl pyrrolidone, N,N-dimethyl formamide, N,N-diethyl formamide and the like, which are non-acid, nitrogen and/or oxygen containing solvents, are preferred.
- dipolar aprotic solvent is intended to mean any organic solvent which has no active protons which may interfere with the reaction herein described.
- Mixtures of dipolar aprotic solvents and other inert organic solvents, such as benzene, toluene, xylene and methylene chloride may also be used. Temperatures above about 100°C are preferred for solution polymerization and are most preferably less than 300°C.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Aryl-diethers which are produced by reacting a halogenated xylene compound, preferably 4-chloro-ortho-xylene, and an alkali metal salt of a bisphenol compound, preferably bisphenol-A. These aryl-diethers serve as precursors in a process for producing polyetherimide polymers.
Description
"ARYL-DIETHERS"
This invention is directed to aryl-diethers derived from the salts of bisphenol compounds and methods for making poiyetherimides therefrom. More particularly, this invention is directed to aryl-diethers of the formula:
and methods for making poiyetherimides by oxidation of these aryl-diethers and polymerizing the oxidized product with organic diamine. Polyetherimides are useful in forming films and wire coating enamels that are resistant to high temperatures. The divalent radical R, of formula I, is an organic radical of the general formula
where Z is a member of the class consisting of divalent
radicals of the formula -CyH2y-,
and -S-, -O-,
and
m is 0 or 1, y is a whole number from 1 to 5 and R' is selected from alkyl radicals of from 1 to 5 carbon atoms.
A preferred class of aryl-diethers which are included by formula I are those wherein R is
Included within this class of preferred aryl-diethers are those of the following formulas
The aryl-diethers of formulas I-IV can be made by effecting reaction between the salt form of a bisphenol compound and halogenated xylenes. The salt form of the bisphenol compound is of the formula:
M+-O - R - O-+M
wherein R is as previously defined and M is an alkali metal, preferably selected from the group consisting of sodium and potassium. The preferred halogenated xylenes are of the formulas
and
wherein Q is halogen, most preferably chlorine or bromine.
The halogenated xylenes and salts of bisphenol are reacted in the presence of a copper catalyst, such as a copper (I) salt at a temperature preferably above 100°C. Eguimolar portions of the reagents are generally preferred but an excess of either reactant will also provide good yields of the aryl-diethers. A quantity of catalyst of about 1 to 30 mole percent based on halogenated xylenes provides acceptable yields, which often exceed 50%. Suitable copper salts are CuBr and CuCl.
The reaction typically takes place within a dipolar aprotic solvent, which is preferably an amide solvent such as dimethylacetamide, dimethylformamide or N-methyl-2-pyrrolidone. Mixtures of these solvents are suitable as are mixtures which contain other dipolar aprotic solvents. Reaction is most preferably accomplished within the range of about 150° to 200°C for 2-4 hours.
The reaction products are recovered and purified by conventional techniques. These include ether extractions, distillation and column chromatography.
The halogenated xylenes are readily obtained by halogenation of xylenes as described by Wisansky and
Ansbacher in Organic Synthesis, Coll. Vol. 3, page 198, incorporated herein by reference. The salts of bisphenol can be obtained by contacting an organic solution of the corresponding bisphenol compound with an aqueous solution of an alkali metal hydroxide, such as NaOH or KOH. An example of a suitable process is disclosed in U.S. 4,492,806; which is incorporated by reference. Typical bisphenol compounds include
2,2-bis-(2-hydroxyphenyl)propane; 2,4'-dihydroxydiphenyImethane; bis-(2-hydroxyphenyl)-methane;
2,2-bis-(4-hydroxyphenyl)-propane hereinafter identified as "bisphenol-A" or "BPA";
1,1-bis-(4-hydroxyphenyl)-ethane; 1,1-bis-(4-hydroxyphenyl)-propane;
2,2-bis-(4-hydroxyphenyl)-pentane;
3,3-bis-(4-hydroxyphenyl)-pentane;
4,4'-dihydroxybiphenyl;
4,4'-dihydroxy-3,3',5,5'-tetramethylbiphenyl; 2,4-dihydroxybenzophenone;
4,4'-dihydroxydiphenyl sulfone;
2,4'-dihydroxydiphenyl sulfone;
4,4'-dihydroxydiphenyl sulfoxide;
4,4'-dihydroxydiphenyl sulfide; etc.
Included within the scope of this invention is a method for utiIizing the aryl-diethers of formula I to
prepare poiyetherimides. The methyl radicals on the terminal aryl groups can be oxidized to form a tetra-acid or an aromatic bis(etheranhydride). An example of a tetra-acid obtained from the preferred aryl-diether of formula II is illustrated by formula V
The aromatic bis(etheranhydride)s obtained from oxidizing aryl-diethers of formula I are illustrated by formula VI
Oxidation of the terminal aryl groups can be achieved by aralkyl oxidation methods know to the art, which include reaction with oxygen in the presence of a metal-ion catalyst, such as manganese or cobalt. In U.S. Patent No. 3,139,452, Hay discloses a process for reacting in liquid phase the alkyl group of an aralkyl compound with oxygen in the presence of a catalyst consisting essentially of a combination of cobalt, bromine and carboxylic acid at a temperature above 80°C. The contents of the Hay patent are incorporated herein by reference. A mixture of products may be obtained by this oxidation reaction, particularly where the divalent organic radical R has alkyl radicals bonded to its aromatic nuclei, as in the preferred species where R is
derived from bisphenol-A. Oxidation may take place on these alkyl radicals as well.
The aryl-diethers in oxidized form can be polymerized to provide poiyetherimides by reaction with an organic diamine of the formula
H2N - R1 - NH2 VII
where R1 is a divalent organic radical selected from the class consisting of
(a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof,
(b) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms and
(c) divalent radicals included within the scope of R as defined above by the formula
where Z and m are as previously defined. Included within the organic diamines of formula VII are, for example,
m-phenylenediamine; p-phenylenediamine; 4,4'-diaminodiphenylpropane; 4,4'-diaminodiphenylmethane; benzidine;
4,4'-diaminodiphenyl sulfide;
4,4'-diaminodiphenyl sulfone;
4,4'-diaminodiphenyl ether;
1,5-diaminoaphthalene; 3,3'-dimethylbenzidine;
3,3'-dimethoxybenzidine;
2,4'-diaminotoluene; 2,6-diaminotoluene;
2,4-bis(β-amino-t-butyl)toluene; bis(p-β-methyl-o-aminopentyl)benzene; 1,3-diamino-4-isopropylbenzene;
1,2-bis(3-aminopropoxy)ethane; m-xylylenediamine; p-xylylenediamine; bis(4-aminocyclohexyl)methane; decamethylenediamine;
3-methylheptamethylenediamine;
4,4-dimethylheptamethylenediamine;
2,11-dodecanediamine;
2,2-dimethylpropylenediamine; octamethylenediamine;
3-methoxyhexamethylenediamine;
2 ,5-dimethylhexamethylenediamine;
2,5-dimethylheptamethylenediamine;
3-methylheptamethylenediamine; 5-methylnonamethylenediamine;
1,4-cyclohexanediamine;
1,12-octadecanediamine; bis(3-aminopropyl)sulfide;
N-methyl-bis(3-aminopropyl)amine; hexamethylenediamine; heptamethylenediamine; 2,4-diaminotoluene; nonamethylenediamine; 2,6-diaminotoluene; bis-(3-aminopropyl)tetramethyldisiloxa
etc.
Polymerization of the oxidized aryl-diethers and diamines can be achieved with or without a solvent. Melt polymerization of the organic diamine can be accomplished at temperatures above about 200°C and preferably less than 350°C. Takekoshi describes suitable melt polymerization processes with greater particularity in U.S. Patent 3,833,546, which is incorporated herein by reference.
Solution polymerization is often more convenient than melt polymerization in that lower temperatures can be utilized. Dipolar aprotic solvents, such as dimethyl sulfoxide, N,N-dimethyl acetamide, N-methyl pyrrolidone, N,N-dimethyl formamide, N,N-diethyl formamide and the like, which are non-acid, nitrogen and/or oxygen containing solvents, are preferred. The term "dipolar aprotic solvent" is intended to mean any organic solvent which has no active protons which may interfere with the reaction herein described. Mixtures of dipolar aprotic solvents and other inert organic solvents, such as benzene, toluene, xylene and methylene chloride may also be used. Temperatures above about 100°C are preferred for solution polymerization and are most preferably less than 300°C.
In order that those skilled in the art will be better able to practice the invention, the following examples are given by way of illustration and not by way of limitation. All parts are by weight.
EXAMPLE I
A solution of the dipotassium salt of bisphenol-A (0.76 g, 2.5 mmol); 4-bromo-ortho-xylene (1.11 mg, 6.0 mmol) and the copper chloride salt, CuCl, (37.1 mg, 0.38 mmol) in N-methyl-2-pyrrolidone was heated with stirring in a flask immersed in an oil bath at about 175°C for 3 hours. The
cooled mixture was diluted with ether (about 60 ml) and water (about 30 ml) and transferred to a separatory funnel. The diluted solution was washed with HCl (30 ml, 1.0 N) followed by NaOH (30 ml, 1 N) and then a brine wash. The ethereal solution was dried by passage through a cone of anhydrous CaSO4 and the ether was removed by distillation at reduced pressure. The residue (1.09 g) was chromatographed on 75 g of silicon gel diluted with 5% ethyl acetate/hexane to afford 776 mg (71.2% yield) of an aryl-diether of formula I. Proton NMR in CDCl3 gave peaks at 6.90 (multiplet), 2.05 (singlet) and 1.51 (singlet) ppm. The intensities were 14.12 and 6, respectively. The peaks at 2.05 ppm and 1.51 ppm are consistent with methyl-aromatic nuclei and methy-gem nuclei, respectively.
EXAMPLE II
A solution of the disodium salt of bisphenol-A (75 mmol), 4-bromo ortho xylene (80 mmol) and a copper chloride salt, CuCl, (2.5 mole %) in N-methyl-2-pyrrolidone (ca. 100 ml) was heated with stirring in an oil bath at about 150°C for about 2-4 hours. The cooled mixture was diluted with ether (about 60 ml) and transferred to a separating funnel where the organic phase was washed with water (30 ml), HCl (1.0 N, 30 ml) and brine. The ether extracts were dried by passage through a cone of anhydrous CaSO4. The ether was removed by distillation at reduced pressure and the residue purified by column chromatography. The isolated yield of the aryl-diether of formula I was 48.6%.
Claims
1. An aryl-diether of the formula
2. An aryl-diether of the formula
3. An aryl-diether of a formula selected from the group consisting of
4. An aryl-diether of claim 3 obtained by reacting a halogenated xylene of a formula selected from the group consisting of
5. An aryl-diether of claim 4 wherein Q is selected from the group consisting of chlorine and bromine and M is selected from the group consisting of sodium and potassium.
6. A method for producing polyetherimide which comprises a) reacting a halogenated xylene and the alkali metal salt of a bisphenol compound in the presence of a copper catalyst at a temperature above about 100°C, said halogenated xylene having a formula selected from the group consisting of
wherein Q is halogen, said alkali metal salt of a bisphenol compound having the formula +M-O-R-O-M+, wherein M is an alkali metal and R is a divalent organic radical of the general formula
radicals of the formulas -CyH2y-, -S-, -O-, and m is 0 or 1, y is a whole number from 1 to 5 and R' is selected alkyl radicals of from 1 to 5 carbon atoms, b) oxidizing the aryl-diethers of step a in the liquid phase by reaction with oxygen in the presence of a carboxyllc acid and a catalyst selected from the group consisting of manganese and cobalt, at a temperature above about 80°C, and c) reacting the dianhydride and the tetracids produced within step b with an organic diamine of the formula H-N-R1-NH2 at a temperature in the range of 100-350°C in the presence of a dipolar aprotic solvent where R1 is a divalent organic radical selected from the class consisting of: (i) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (ii) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms and
(iii) divalent radicals included within the scope of R, as previously defined.
7. A method as in claim 6 wherein the copper catalyst is CuCl, Q is selected from the group of halogens consisting of chlorine and bromine, M is selected from the group of alkali metals consisting of sodium and potassium and the carboxylic acid is acetic acid.
8. A method as in claim 7 wherein Z is C3H6 and m is 1.
9. A method as in claim 8 wherein the reaction between said organic diamine and the dianhydrides and teracids takes place in the absence of solvent at a temperature above 200°C.
10. A method as in claim 8 wherein the dipolar aprotic solvent is selected from the group consisting of N,N- dimethyl formamide, dimethyl sulfoxide, N,N-dimerhyl acetamide and N-methyl pyrrolidone.
11. A method as in claim 10 wherein the oxidation catalyst is cobalt promoted with bromine and the temperature falls within the range of 80°C to 115°C.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/712,487 US4600798A (en) | 1985-03-18 | 1985-03-18 | Aryl-diethers |
EP19860904598 EP0274465A1 (en) | 1986-07-02 | 1986-07-02 | Aryl-diethers |
JP50375886A JPH01500112A (en) | 1986-07-02 | 1986-07-02 | aryl-diether |
PCT/US1986/001387 WO1988000178A1 (en) | 1986-07-02 | 1986-07-02 | Aryl-diethers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1986/001387 WO1988000178A1 (en) | 1986-07-02 | 1986-07-02 | Aryl-diethers |
Publications (1)
Publication Number | Publication Date |
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WO1988000178A1 true WO1988000178A1 (en) | 1988-01-14 |
Family
ID=22195559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/US1986/001387 WO1988000178A1 (en) | 1985-03-18 | 1986-07-02 | Aryl-diethers |
Country Status (3)
Country | Link |
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EP (1) | EP0274465A1 (en) |
JP (1) | JPH01500112A (en) |
WO (1) | WO1988000178A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3139452A (en) * | 1957-02-25 | 1964-06-30 | Gen Electric | Oxidation of p-xylene to terephthalic acid |
FR2030905A5 (en) * | 1969-02-13 | 1970-11-13 | Trw Inc | |
FR2112351A1 (en) * | 1970-10-28 | 1972-06-16 | Trw Inc | |
EP0154720A1 (en) * | 1983-12-30 | 1985-09-18 | International Business Machines Corporation | Polyamic acid copolymer solutions for improved semiconductor manufacturing |
-
1986
- 1986-07-02 WO PCT/US1986/001387 patent/WO1988000178A1/en not_active Application Discontinuation
- 1986-07-02 EP EP19860904598 patent/EP0274465A1/en not_active Withdrawn
- 1986-07-02 JP JP50375886A patent/JPH01500112A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3139452A (en) * | 1957-02-25 | 1964-06-30 | Gen Electric | Oxidation of p-xylene to terephthalic acid |
FR2030905A5 (en) * | 1969-02-13 | 1970-11-13 | Trw Inc | |
FR2112351A1 (en) * | 1970-10-28 | 1972-06-16 | Trw Inc | |
EP0154720A1 (en) * | 1983-12-30 | 1985-09-18 | International Business Machines Corporation | Polyamic acid copolymer solutions for improved semiconductor manufacturing |
Non-Patent Citations (2)
Title |
---|
CHEMICAL ABSTRACTS, Volume 72, No. 17, 27 April 1970, (Columbus, Ohio, US), M.M. KOTON et al.: "Synthesis of new Dianhydrides of Aromatic Tetra-Carboxylic Acids. II.", see pages 343-344, Abstract 90000p, & Zh. Org. Khim. 1970, 6(1), 88-90 * |
CHEMICAL ABSTRACTS, Volume 73, No. 22, 30 November 1970, (Columbus, Ohio, US), L.A. LAIUS et al.: "Synthesis of Polyimidazopyrrolones Studied by Infrared Spectroscopy", see page 4, Abstract 110189h, & Vysokomol. Soedin., Ser. A 1970, 12(8), 1834-40 * |
Also Published As
Publication number | Publication date |
---|---|
EP0274465A1 (en) | 1988-07-20 |
JPH01500112A (en) | 1989-01-19 |
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