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US5189127A
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Crosslinked polyimides prepared from N-(3-ethynylphenyl)maleimide
Assignee: National Aeronautics and Space Administration
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Filing: 1991-12-03
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Granted: 1993-02-23
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Expires: 2011-12-03
Abstract
Abstract The compound N-(3-ethynylphenyl)maleimide (NEPMI) was used to prepare thermally stable, glassy polyimides which did not exhibit glass transition temperatures below 500° C. NEPMI was blended with the maleimide of methylene dianiline (BMI) and heated to form the polyimide. NEPMI was also mixed with Thermid 600®, a commercially available bisethynyl oligomeric material, and heated to form a thermally stable, glassy polyimide. Lastly, NEPMI was blended with both BMI and Thermid 600® to form thermally stable, glassy polyimides.
Inventors
- 👤 Margaret K. Gerber
- 👤 Terry L. St. Clair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:05
CPC Classifications
C; C08; C08F; C08F290/00; C08F290/02; C08F290/06; C08F38/00; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
A thermally stable, glassy, crosslinked polymer prepared from a monomer composition consisting essentially of at least one ethynyl imide (I) having the following general structural formula: ##STR6## where Ar is any aromatic moiety; and a member selected from the group consisting of: ##STR7## where Ar is any aromatic moiety and n=1-50; and said polymer has a glass transition temperature of at least 500° C.
Claim 2
Dependent Claim
64 words
A thermally stable, glassy, crosslinked polymer prepared from a monomer composition consisting essentially of at least one ethynyl imide (I) having the following general structural formula: ##STR6## where Ar is any aromatic moiety; and a member selected from the group consisting of: ##STR7## where Ar is any aromatic moiety and n=1-50; and said polymer has a glass transition temperature of at least 500° C.
Claim 3
Dependent Claim
18 words
A thermally stable, glassy, crosslinked polymer according to claim 1, wherein (I) has the following structural formula: ##STR8##
Claim 4
Dependent Claim
17 words
A thermally stable, glassy, crosslinked according to claim 1, wherein (II) has the following structural formula: ##STR9##
Claim 5
Dependent Claim
23 words
A thermally stable, glassy, crosslinked polymer according to claim 3, wherein the ratio of NEPMI to BMI is between about 90:10 and 20:80.
Claim 6
Dependent Claim
20 words
A thermally stable, glassy, crosslinked polymer according to claim 1, wherein (III) has the following structural formula: ##STR10## where n=1-10.
Claim 7
Dependent Claim
23 words
A thermally stable, glassy, crosslinked polymer according to claim 5, wherein the ratio of NEPMI to (IV) is between about 90:10 and 20:80.
Claim 8
Dependent Claim
24 words
A thermally stable, glassy, crosslinked polymer according to claim 1, wherein (I), (II), and (III) have the following structural formulas, respectively: ##STR11## where n=1-10.
Claim 9
Dependent Claim
21 words
A thermally stable, glassy, crosslinked polymer according to claim 7, wherein the ratio of NEPMI to BMI to (IV) is 1:1:1.
Claim 10
Dependent Claim
21 words
A thermally stable, glassy, crosslinked polymer according to claim 7, wherein the ratio of NEPMI to BMI to (IV) is 1:0.5:3.
Claim 11
Dependent Claim
21 words
A thermally stable, glassy, crosslinked polymer according to claim 7, wherein the ratio of NEPMI to BMI to (IV) is 1:3:2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-23 | 1996-08-24 | 1997-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-23 | 2000-08-24 | 2001-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-23 | 2004-08-24 | 2005-02-23 | $7700.00 | Window Closed / Lapsed |