EP0099997A1
Expired / Lapsed
EP
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Process for producing aromatic polyamide
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1983-07-01
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Granted: —
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Expires: 2003-07-01
Abstract
Abstract An aromatic polyamide having a high molecular weight is produced by a polycondensation reaction of an aromatic aminocarboxylic acid and/or a mixture of an aromatic dicarboxylic acid and an aromatic diamine in a polar solvent in the presence of a dehydrating catalyst with heating at a temperature of about 160°C or higher.
Inventors
- 👤 Katsuji Ueno
- 👤 Kenji Nagaoka
- 👤 Akira Miyashita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:01
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G69/08; C08G69/12; C08G69/36
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A process for producing an aromatic polyamide which comprises conducting a polycondensation reaction of an aromatic aminocarboxylic acid and/or a mixture of an aromatic dicarboxylic acid and an aromatic diamine in a polar solvent in the presence of a dehydrating catalyst with heating at a temperature of about 160°C or higher.
Claim 2
Dependent Claim
51 words
A process for producing an aromatic polyamide which comprises conducting a polycondensation reaction of an aromatic aminocarboxylic acid and/or a mixture of an aromatic dicarboxylic acid and an aromatic diamine in a polar solvent in the presence of a dehydrating catalyst with heating at a temperature of about 160°C or higher.
Claim 3
Dependent Claim
27 words
A process according to Claim 1, wherein the aromatic aminocarboxylic acid is at least one compound of the formula: wherein Ar 1 is a bivalent aromatic residue.
Claim 4
Dependent Claim
17 words
A process according to Claim 2, wherein the aromatic aminocarboxylic acid is p-aminobenzoic acid or m-aminobenzoic acid.
Claim 5
Dependent Claim
27 words
A process according to Claim 1, wherein the aromatic dicarboxylic acid is at least one compound of the formula: wherein Ar 2 is a bivalent aromatic residue.
Claim 6
Dependent Claim
44 words
A process according to Claim 4, wherein the aromatic dicarboxylic acid is at least one member selected from the group consisting of terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-benzophenonedicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid, 4,4'-diphenylsulfone dicarboxylic acid, and 2-methylterephthalic acid.
Claim 7
Dependent Claim
26 words
A process according to Claim 1, wherein the aromatic diamine is at least one compound of the formula: wherein Ar 3 is a bivalent aromatic residue.
Claim 8
Dependent Claim
35 words
A process according to Claim 6, wherein the aromatic diamine is at least one member selected from the group consisting of p-phenylenediamine, m-phenylenediamine, toluylenediamine, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-diaminobiphenyl, 3,3'-dimethyl-4,4'-diaminobiphenyl, 4,4'-diaminodinhenyl- sulfide, and 2,6-diaminonaphthalene.
Claim 9
Dependent Claim
28 words
A process according to Claim 1, wherein the polar solvent is a mixture of organic solvents containing about 20% by weight or more of an aprotic polar solvent.
Claim 10
Dependent Claim
20 words
A process according to Claim 1, wherein the dehydrating catalyst is a phosphorus compound, a boron compound or a heteropoly-acid.
Claim 11
Dependent Claim
25 words
A process according to Claim 1, wherein the polar solvent is a mixture of organic solvents containing about 20% by weight or more of sulfolane.
Claim 12
Dependent Claim
12 words
A process according to Claim 1, wherein the polar solvent is sulfolane.
Claim 13
Dependent Claim
36 words
A process according to Claim 1, wherein the dehydrating catalyst is used in an amount of 0.001 to 0.2 mole per mole of a total of the aromatic aminocarboxylic acid used and the aromatic diamine used.
Claim 14
Dependent Claim
14 words
A process according to Claim 1, wherein the reaction temperature is 200 to 250°C.
Claim 15
Dependent Claim
38 words
A process according to Claim 1, wherein the aromatic aminocarboxylic acid and/or the mixture of aromatic dicarboxylic acid and an aromatic diamine is a mixture of isophthalic acid and/or terephthalic acid and aromatic diamines containing mainly 3,4'-diaminodiphenyl ether.
Claim 16
Dependent Claim
14 words
A process according to Claim 1, wherein the dehydrating catalyst is a phosphorus compound.
Claim 17
Dependent Claim
15 words
A process according to Claim 1, wherein the dehydrating catalyst is a phosphorous acid ester.
Claim 18
Dependent Claim
13 words
A process according to Claim 1, wherein the dehydrating catalyst is boric acid.
References Cited (Backward Citations)
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