Patent EP0130481A1 successfully refreshed from Google Patents.
EP0130481A1
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Polyimide resin
Assignee: Nissan Chemical Corp
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Filing: 1984-06-20
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Granted: —
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Expires: 2004-06-20
Abstract
Abstract A polyimide resin composed essentially of repeating units represented by the general formula: where R is a divalent aromatic hydrocarbon radical.
Inventors
- 👤 Koto Noriaki
- 👤 Abe Toyohiko
- 👤 Otsuka Kanji
- 👤 Suzuki Hideo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 09:33
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
A polyimide resin composed essentially of repeating units represented by the general formula: where R is a divalent aromatic hydrocarbon radical.
Claim 2
Dependent Claim
21 words
A polyimide resin composed essentially of repeating units represented by the general formula: where R is a divalent aromatic hydrocarbon radical.
Claim 3
Dependent Claim
18 words
The polyimide resin according to Claim 1, wherein the hydrocarbon radical is selected from the group consisting of
Claim 4
Dependent Claim
34 words
The polyimide resin according to Claim 1, which comprises at least 90 mol % of the repeating units represented by the general formula I and less than 10 mol % of other repeating units.
Claim 5
Dependent Claim
38 words
The polyimide resin according to Claim 3, wherein said other repeating units are selected from the group consisting of aliphatic imide units, aromatic imide units and alicyclic imide units other than those represented by the general formula I.
Claim 6
Dependent Claim
64 words
A process for preparing a polyimide resin composed essentially of repeating units represented by the general formula: where R is a divalent aromatic hydrocarbon radical, which comprises polycondensing a tetracarboxylic dianhydride composed essentially of cyclobutane-1,2:3,4-tetracarboxylic dianhydride represented by the formula: with a diamine composed essentially of an aromatic diamine represented by the general formula: where R is as defined above, followed by dehydrating cyclization.
Claim 7
Dependent Claim
64 words
A process for preparing a polyimide resin composed essentially of repeating units represented by the general formula: where R is a divalent aromatic hydrocarbon radical, which comprises polycondensing a tetracarboxylic dianhydride composed essentially of cyclobutane-1,2:3,4-tetracarboxylic dianhydride represented by the formula: with a diamine composed essentially of an aromatic diamine represented by the general formula: where R is as defined above, followed by dehydrating cyclization.
References Cited (Backward Citations)
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