US4358579A
Expired / Lapsed
US
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Polyimides from tetramethylcyclobutane-1,2,3,4,-tetracarboxylic dianhydride and diamines
Assignee: BP Corp North America Inc
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Filing: 1981-07-24
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Granted: 1982-11-09
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Expires: 2001-07-24
Abstract
Abstract Novel polyimides and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride and diamines. Also glass and graphite filled polyimides are prepared. The polyimides are useful as engineering plastics.
Inventors
- 👤 Tayseer S. Nimry
- 👤 Ellis K. Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1046; C08G73/105; C08L; C08L79/00; C08L79/04; C08L79/08
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
22 words
A polyimide consisting essentially of the following recurring structure: ##STR3## wherein R is a divalent aliphatic, cycloaliphatic, araliphatic or aromatic hydrocarbon radical.
Claim 2
Dependent Claim
22 words
A polyimide consisting essentially of the following recurring structure: ##STR3## wherein R is a divalent aliphatic, cycloaliphatic, araliphatic or aromatic hydrocarbon radical.
Claim 3
Dependent Claim
17 words
The polymer of claim 1 wherein R is an aliphatic hydrocarbon from 2 to 18 carbon atoms.
Claim 4
Dependent Claim
17 words
The polyimide of claim 1 wherein R is an aromatic hydrocarbon from 6 to 20 carbon atoms.
Claim 5
Dependent Claim
39 words
The polyimide of claim 1 wherein the aromatic hydrocarbon radical contains from 6 to 10 carbon atoms joined directly or by stable linkage selected from the group consisting of --O--, methylene, ##STR4## --SO--, --SO 2 -- and --S-- radicals.
Claim 6
Dependent Claim
16 words
The polyimides of claim 1 wherein the polyimide is in the form of a molded object.
Claim 7
Dependent Claim
15 words
The polyimide of claim 1 wherein the polyimide is in the form of a laminate.
Claim 8
Dependent Claim
15 words
The polyimide of claim 1 wherein the polyimide is in the form of a film.
Claim 9
Dependent Claim
20 words
The polyimide of claim 1 wherein the polyimide is in the form of a metal coating suitable for electrical service.
Claim 10
Dependent Claim
10 words
A polyimide consisting essentially of the following recurring structure: ##STR5##
Claim 11
Dependent Claim
10 words
A polyimide consisting essentially of the following recurring structure: ##STR5##
Claim 12
Dependent Claim
16 words
A polyimide of claim 9 wherein the polyimide is in the form of a molded object.
Claim 13
Dependent Claim
15 words
The polyimide of claim 9 wherein the polyimide is in the form of a laminate.
Claim 14
Dependent Claim
15 words
The polyimide of claim 9 wherein the polyimide is in the form of a film.
Claim 15
Dependent Claim
10 words
A polyimide consisting essentially of the following recurring structure: ##STR6##
Claim 16
Dependent Claim
10 words
A polyimide consisting essentially of the following recurring structure: ##STR6##
Claim 17
Dependent Claim
16 words
A polyimide of claim 13 wherein the polyimide is in the form of a molded object.
Claim 18
Dependent Claim
15 words
The polyimide of claim 13 wherein the polyimide is in the form of a laminate.
Claim 19
Dependent Claim
15 words
The polyimide of claim 13 wherein the polyimide is in the form of a film.
Claim 20
Dependent Claim
10 words
A polyimide consisting essentially of the following recurring structure: ##STR7##
Claim 21
Dependent Claim
10 words
A polyimide consisting essentially of the following recurring structure: ##STR7##
Claim 22
Dependent Claim
16 words
The polyimide of claim 17 wherein the polyimide is in the form of a molded object.
Claim 23
Dependent Claim
15 words
The polyimide of claim 17 wherein the polyimide is in the form of a laminate.
Claim 24
Dependent Claim
15 words
The polyimide of claim 17 wherein the polyimide is in the form of a film.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |