US4537834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal (II) 4,4',4",4'"-phthalocyanine tetraamines as curing agents for epoxy resins
Assignee: National Aeronautics and Space Administration
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Filing: 1984-04-11
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Granted: 1985-08-27
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Expires: 2004-04-11
Abstract
Abstract Metal, preferably divalent copper, cobalt or nickel, phthalocyanine tetraamines are used as curing agents for epoxides. The resulting copolymers have high thermal and chemical resistance and are homogeneous. They are useful as binders for laminates, e.g. graphite cloth laminate.
Inventors
- 👤 Bappalige N. Achar
- 👤 George M. Fohlen
- 👤 John A. Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:44
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20; C08G73/10; C08G73/1085; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31511; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3528; Y10T442/3569; Y10T442/3585
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
14 words
A homogeneous cured polymer of metal 4,4',4",4'"-phthalocyanine tetraamine and one or more epoxy compounds.
Claim 2
Dependent Claim
14 words
A homogeneous cured polymer of metal 4,4',4",4'"-phthalocyanine tetraamine and one or more epoxy compounds.
Claim 3
Dependent Claim
22 words
The homogeneous cured polymer of claim 1 wherein the metal is a divalent metal having an atomic radius of about 1.35 Å.
Claim 4
Dependent Claim
16 words
The homogeneous cured polymer of claim 2 wherein the metal is divalent copper, cobalt or nickel.
Claim 5
Dependent Claim
13 words
The homogeneous cured polymer of claim 2 wherein the metal is Cu II.
Claim 6
Dependent Claim
13 words
The homogeneous cured polymer of claim 2 wherein the metal is Co II.
Claim 7
Dependent Claim
13 words
The homogeneous cured polymer of claim 2 wherein the metal is Ni II.
Claim 8
Independent Claim
39 words
A method of preparing a heat resistant homogeneous cured polymer which comprises curing an epoxide with a metal 4,4',4",4'"-phthalocyanine tetraamine, said metal 4,4',4",4'"-phthalocyanine tetraamine being a pure material having been produced by the process of reducing metal 4,4',4",4'"-tetranitro phthalocyanine.
Claim 9
Independent Claim
39 words
A method of preparing a heat resistant homogeneous cured polymer which comprises curing an epoxide with a metal 4,4',4",4'"-phthalocyanine tetraamine, said metal 4,4',4",4'"-phthalocyanine tetraamine being a pure material having been produced by the process of reducing metal 4,4',4",4'"-tetranitro phthalocyanine.
Claim 10
Dependent Claim
20 words
The method of claim 7 wherein the metal is a divalent metal having an atomic radius of about 1.35 Å.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein the metal is copper, cobalt or nickel.
Claim 12
Dependent Claim
10 words
A laminate impregnated with the cured polymer of claim 1.
Claim 13
Dependent Claim
16 words
The laminate of claim 10 wherein the metal is Cu II, Co II or Ni II.
Claim 14
Dependent Claim
8 words
The laminate of claim 11 including an elastomer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |