US4377657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis-maleimide resin/divinyl arylene composites
Assignee: Cytec Technology Corp
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Filing: 1981-03-30
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Granted: 1983-03-22
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Expires: 2001-03-30
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 with a minor portion of maleimide of an aliphatic amine 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. Microcracking is further reduced and transverse strength is increased by the addition of 0 to 15% of compatible elastomers to the resin and cross-linking agent. Room temperature tackiness, heat resistance and cross-link density are improved by the presence of 0 to 10% of a trifunctional curing agent.
Inventors
- 👤 Sidney W. Street
- 👤 Don A. Beckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; C08G73/122; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J5/249; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
158 words
A composite comprising 20 to 50% by weight of a resin system consisting essentially of: 50 to 95% 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 the 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% 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° F. to 250° F.; 0 to 15% by weight of compatible elastomers that are compatible with the bis-imide and cross-linking agent; 0 to 10% by weight of a trifunctional unsaturated curing agent for said bis-imide; 0 to 5% by weight of an oxidation inhibitor; and the remainder of the composite being fiber reinforcement.
Claim 2
Dependent Claim
158 words
A composite comprising 20 to 50% by weight of a resin system consisting essentially of: 50 to 95% 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 the 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% 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° F. to 250° F.; 0 to 15% by weight of compatible elastomers that are compatible with the bis-imide and cross-linking agent; 0 to 10% by weight of a trifunctional unsaturated curing agent for said bis-imide; 0 to 5% by weight of an oxidation inhibitor; and the remainder of the composite being fiber reinforcement.
Claim 3
Dependent Claim
14 words
A composite according to claim 1 in which the cross-linking agent is divinyl benzene.
Claim 4
Dependent Claim
27 words
A composite according to claim 1 in which Y is derived from an acid or anhydride selected from the group consisting of maleic, citraconic, tetrahydrophthalic and tetrahydronaphthalic.
Claim 5
Dependent Claim
23 words
A composite according to claim 1 in which 75 to 95% by weight of the mixture consists of bis-imides derived from aromatic diamines.
Claim 6
Dependent Claim
40 words
A composite according to claim 1 in which the elastomer is present in an amount of 1 to 6 percent by weight and is selected from the group consisting of polyether sulfones, bis phenol linear homopolymeric epoxies or polyacrylic esters.
Claim 7
Dependent Claim
16 words
A composite according to claim 1 in which Y contains from 2 to 6 carbon atoms.
Claim 8
Dependent Claim
27 words
A composite according to claim 5 in which the curing agent is present in an amount from 1 to 7 percent by weight of the resin system.
Claim 9
Dependent Claim
14 words
A composite according to claim 7 in which the curing agent is triallyl isocyanurate.
Claim 10
Dependent Claim
27 words
A composite according to claim 8 in which the oxidation inhibitor is present in an amount from 0.5 to 3.0 percent by weight of the resin system.
Claim 11
Dependent Claim
12 words
A composite according to claim 9 in which the inhibitor is hydroquinone.
Claim 12
Dependent Claim
27 words
A composite according to claim 1 in which the fiber reinforcement is selected from carbon, polyimide, polyvinyl alcohol graphite or fiberglass in filament, fiber or cloth form.
Claim 13
Dependent Claim
13 words
A composite according to claim 3 in which the bis-imide is an N,N'-bis-maleimide.
Claim 14
Dependent Claim
52 words
A composite according to claim 12 which the maleimide is derived from at least one diamine selected from the group consisting of ethylene diamine, hexamethylene diamine, phenylene diamine, trimethylhexamethylene 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 and mixtures thereof.
Claim 15
Dependent Claim
42 words
A composite according to claim 12 in which the bis-imide is a low melting mixture of N,N'-bis-maleimides derived from diamines consisting essentially of a major portion of at least one aromatic diamine and a minor portion of at least one aliphatic diamine.
Claim 16
Dependent Claim
37 words
A composite according to claim 14 in which the mixture of bis-maleimides is derived from diamines consisting essentially of 50 to 80% methylene dianiline, 5 to 30% toluene diamine and 5 to 25% of trimethyl hexamethylene diamine.
Claim 17
Dependent Claim
16 words
A composite according to claim 11 in which the fiber reinforcement is graphite in fiber form.
Claim 18
Dependent Claim
19 words
A composite according to claim 14 in which the mixture has a melting point between 70° and 125° C.
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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) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |