Patent US4034579A successfully refreshed from Google Patents.
Patent US4454283A successfully refreshed from Google Patents.
US4454283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis-maleimide resin with inhibitor
Assignee: Cytec Technology Corp
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Filing: 1983-01-24
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Granted: 1984-06-12
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Expires: 2003-01-24
Abstract
Abstract A novel bis-imide matrix resin system comprising 50 to 95 percent by weight of ethylenically unsaturated bis-imides, preferably a low melting mixture of a major portion of maleimides of aromatic amines such as toluene diamine and methylene dianiline with a minor portion of maleimide of an aliphatic amine such as trimethyl hexamethylene diamine and 5 percent to 35 percent by weight of a diunsaturated low-temperature cross-linking agent such as divinyl benzene which gels the bis-imide at low temperatures. This reduces stress between the matrix resin and the surface of the reinforcing fiber, thus reducing the tendency to form microcracks. Room temperature stability is improved by the presence of 0.5 to 5 percent of an oxidation inhibitor such as hydroquinone. The resin is useful as a matrix resin for high performance, graphite fiber reinforced composites.
Inventors
- 👤 Sidney W. Street
- 👤 Don A. Beckely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; C08G73/122
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A resin system consisting essentially of: 50 to 95 percent by weight of a mixture of unsaturated N,N'-bis-imides of the formula: ##STR2## where Y represents a divalent radical of at least 2 carbon atoms and contains a carbon-carbon double bond and in major portion of the mixture, Z is the residue of at least one aromatic diamine and in the minor portion of the mixture Z is the residue of an aliphatic diamine; 5to 35 percent by weight of a divinyl-arylene, cross-linking agent capable of addition polymerization cross-linking with the bis-imides at a temperature from above 100 degrees F. to 250 degrees F.; and 0.5 to 5 percent by weight of an oxidation inhibitor.
Claim 2
Dependent Claim
114 words
A resin system consisting essentially of: 50 to 95 percent by weight of a mixture of unsaturated N,N'-bis-imides of the formula: ##STR2## where Y represents a divalent radical of at least 2 carbon atoms and contains a carbon-carbon double bond and in major portion of the mixture, Z is the residue of at least one aromatic diamine and in the minor portion of the mixture Z is the residue of an aliphatic diamine; 5to 35 percent by weight of a divinyl-arylene, cross-linking agent capable of addition polymerization cross-linking with the bis-imides at a temperature from above 100 degrees F. to 250 degrees F.; and 0.5 to 5 percent by weight of an oxidation inhibitor.
Claim 3
Dependent Claim
14 words
A system according to claim 1 in which the cross-linking agent is divinyl benzene.
Claim 4
Dependent Claim
22 words
A system according to claim 1 in which Y is derived from an acid or anhydride selected from maleic, citraconic, or tetrahydronaphthalic.
Claim 5
Dependent Claim
51 words
A system according to claim 3 in which the bis-imide is a maleimide derived from at least one diamine selected from ethylene diamine, hexamethylene diamine, phenylene diamine, trimethyl-hexamethylene diamine, methylene dianiline, toluene diamine, 4,4'-diphenylmethane diamine, 4,4'-diphenylether diamine, 4,4'-diphenylsulfone diamine, 4,4'-dicyclohexanemethane diamine, metaxylylene diamine, 4,4'-diphenylcyclohexane diamine, 3,3'-diphenyl sulfone diamine or mixtures thereof.
Claim 6
Dependent Claim
24 words
A system according to claim 1 in which 75 to 95 percent by weight of the mixture consists of bis-imides derived from aromatic diamines.
Claim 7
Dependent Claim
20 words
A system according to claim 5 in which the mixture has a melting point between 70 and 125 degrees C.
Claim 8
Dependent Claim
16 words
A system according to claim 1 in which Y contains from 2 to 6 carbon atoms.
Claim 9
Dependent Claim
13 words
A system according to claim 1 in which the bis-imide is an N,N'-bis-maleimide.
Claim 10
Dependent Claim
42 words
A system according to claim 8 in which the mixture of bis-imides is derived from diamines consisting essentially of 50 to 80 percent of methylene dianiline, 5 to 30 percent of toluene diamine and 5 to 25 percent of trimethyl hexamethylene diamine.
Claim 11
Dependent Claim
23 words
A system according to claim 9 in which the oxidation inhibitor is present in an amount from 0.5 to 3.0 percent by weight.
Claim 12
Dependent Claim
12 words
A system according to claim 10 in which the inhibitor is hydroquinone.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |