EP0350203A2
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EP
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Process for preparing polyimide having excellent high temperature stability
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1989-06-28
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Granted: —
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Expires: 2009-06-28
Abstract
Abstract This invention relates to a process for preparing polyimide having good heat-stability and excellent flowability in a molten state. The polyimide is prepared by reacting 3,3′-diaminobenzophnone or bis(3-aminophenyl)sulfone, tetracarboxylic dianhydrides such as pyromellitic dianhydride, 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and bis(3,4-dicarboxyphenyl) ether dianhydride; and dicarboxylic anhydrides such as glutaric anhydride, 1,2-hexanedicarboxylic anhydride, phthalic anhydride and 3,4-benzophenonedicarboxylic anhydride. The molar ratio of aromatic diamine : tetracarboxylic dianhydride : dicarboxylic anhydride is 1 :(0.9 to 1.0) : (0.001 to 1.0).
Inventors
- 👤 Masahiro Ohta
- 👤 Katsuaki Iiyama
- 👤 Saburo Kawashima
- 👤 Shoji Tamai
- 👤 Hideaki Oikawa
- 👤 Akihiro Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 08:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1014; C08G73/1042; C08G73/1075; C08G73/1078
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
168 words
A process for preparing a polyimide comprising reacting (a) an aromatic diamine represented by the formula (IV ) wherein X represents a carbonyl radical or a sulfonyl radical, (b) at least one tetracarboxylic dianhydride represented by the formula ( V ) wherein R represents a tetravalent radical selected from the group consisting of an aliphatic radical having at least two carbon atoms, a cyclic aliphatic radical, a monocyclic aromatic radical, a fused polycyclic aromatic radical,a polycyclic aromatic radical wherein the aromatic rings are linked together directly or via a bridge member; and (c) the reaction is carried out in the presence of dicarboxylic anhydride represented by the formula (VI ) : wherein Z represents a divalent radical selected from the group consisting of an aliphatic radical, cyclic aliphatic radical,monocyclic aromatic radical, fused polycyclic aromatic radical, and polycyclic aromatic radical wherein the aromatic radicals are linked to one another directly or via bridge member;to form a polyamic acid; and dehydrating or imidizing said polyamic acid to form a polyimide.
Claim 2
Dependent Claim
168 words
A process for preparing a polyimide comprising reacting (a) an aromatic diamine represented by the formula (IV ) wherein X represents a carbonyl radical or a sulfonyl radical, (b) at least one tetracarboxylic dianhydride represented by the formula ( V ) wherein R represents a tetravalent radical selected from the group consisting of an aliphatic radical having at least two carbon atoms, a cyclic aliphatic radical, a monocyclic aromatic radical, a fused polycyclic aromatic radical,a polycyclic aromatic radical wherein the aromatic rings are linked together directly or via a bridge member; and (c) the reaction is carried out in the presence of dicarboxylic anhydride represented by the formula (VI ) : wherein Z represents a divalent radical selected from the group consisting of an aliphatic radical, cyclic aliphatic radical,monocyclic aromatic radical, fused polycyclic aromatic radical, and polycyclic aromatic radical wherein the aromatic radicals are linked to one another directly or via bridge member;to form a polyamic acid; and dehydrating or imidizing said polyamic acid to form a polyimide.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein the molar ratio of said tetracarboxylic dianhydride to said aromatic diamine is from about 0.9 to about 1.0 mole of tetracarboxylic dianhydride per mole of aromatic diamine.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the molar ratio of said dicarboxylic anhydride to said aromatic diamine is from about 0.001 to about 1.0 mole of dicarboxylic anhydride per mole of aromatic diamine.
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein said molar ratio is from about 0.01 to about 0.5 mole of dicarboxylic anhydride per mole of aromatic diamine.
Claim 6
Dependent Claim
33 words
The process of claim 2 wherein the molar ratio of said dicarboxylic anhydride to said aromatic diamine is from about 0.001 to about 1.0 mole of dicarboxylic anhydride per mole of aromatic diamine.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said tetracarboxylic dianhydride is 3,3′,4,4′-benzophenonetetracarboxylic dianhydride.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein said dicarboxylic anhydride is phthalic anhydride.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the reaction temperature is from about 0 °C to about 250 °C.
Claim 10
Dependent Claim
16 words
The process of claim 8 wherein the reaction temperature is no greater than about 60 °C.
Claim 11
Dependent Claim
18 words
The process of claim 1 wherein the reaction time is from about 4 hours to about 24 hours.
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein said polyamic acid is dehydrated by heating at a temperature of from about 100 °C to about 400 °C.
References Cited (Backward Citations)
No citation records indexed.
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