Patent US4721639A successfully refreshed from Google Patents.
US4721639A
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Bis-maleimide resin systems and structural composites prepared therefrom
Assignee: Cytec Technology Corp
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Filing: 1986-11-24
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Granted: 1988-01-26
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Expires: 2006-11-24
Abstract
Abstract The use of organophosphines, organophosphonium salts or organophosphine complexes as cure catalysts in the cure of maleimide resin systems produces products having excellent physical properties and improved gel times. These systems are especially useful in the production of advanced structural composites.
Inventors
- 👤 David A. Shimp
- 👤 Jack D. Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:21
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J5/249; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/14; Y10T428/1414; Y10T428/28; Y10T428/2852; Y10T428/2878; Y10T428/2883; Y10T428/2891; Y10T428/2896; Y10T428/30
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
115 words
A release paper backed, heat-curable prepreg, comprising: (a) a heat-curable resin comprising (i) a maleimide-group-containing resin, and (ii) an effective amount of a catalyst selected from the group consisting of organophosphines, organophosphonium salts, or complexes thereof; (b) a fiber support selected from the group consisting of (i) a fine denier carrier web comprising woven or non-woven polyamide, polyurea, polyurethane, polybenzimidazole, polyacrylic, or polyester fibers, and (ii) fiber-reinforcement comprising woven or unidirectional reinforcing fibers selected from the group consisting of carbon/graphite, glass, boron, and aramid fibers; wherein said fiber support is impregnated by said heat curable resin, and (c) a release-paper backing strippably adherent to at least one side of said heat-curable resin impregnated fiber support.
Claim 2
Dependent Claim
115 words
A release paper backed, heat-curable prepreg, comprising: (a) a heat-curable resin comprising (i) a maleimide-group-containing resin, and (ii) an effective amount of a catalyst selected from the group consisting of organophosphines, organophosphonium salts, or complexes thereof; (b) a fiber support selected from the group consisting of (i) a fine denier carrier web comprising woven or non-woven polyamide, polyurea, polyurethane, polybenzimidazole, polyacrylic, or polyester fibers, and (ii) fiber-reinforcement comprising woven or unidirectional reinforcing fibers selected from the group consisting of carbon/graphite, glass, boron, and aramid fibers; wherein said fiber support is impregnated by said heat curable resin, and (c) a release-paper backing strippably adherent to at least one side of said heat-curable resin impregnated fiber support.
Claim 3
Dependent Claim
16 words
The prepreg of claim 1 wherein said maleimide-group-containing resin comprises a bismaleimide, polyaminobismaleimide, or mixtures thereof.
Claim 4
Dependent Claim
21 words
The prepreg of claim 2 wherein said polyaminobismaleimide comprises a polyaminobismaleimide prepared by reacting a bis-maleimide with one or more diamines.
Claim 5
Dependent Claim
29 words
The prepreg of claim 3 wherein said diamine is selected from the group consisting of cyclohexanediamine, hexanediamine, phenylenediamine, toluenediamine, diaminodiphenylmethane, xylylenediamine, isophoronediamine, dodecanediamine, diaminodiphenyloxide, diaminodiphenylsulfide, and 3,3'- and 4,4'-diaminodiphenylsulfone.
Claim 6
Dependent Claim
11 words
The prepreg of claim 1 further comprising (d) an unsaturated co-monomer.
Claim 7
Dependent Claim
14 words
The prepreg of claim 5 wherein said unsaturated co-monomer is a multiply unsaturated co-monomer.
Claim 8
Dependent Claim
26 words
The prepreg of claim 6 whrein said multiply unsaturated co-monomer is a bis-unsaturated co-monomer selected from the group consisting of diallylphthalate, 2,2'-diallylbisphenol A, and 2,2'-dipropenylbisphenol A.
Claim 9
Dependent Claim
16 words
The prepreg of claim 1 further comprising (d) an unsaturated co-monomer and (e) a diamine co-monomer.
Claim 10
Dependent Claim
27 words
The prepreg of claim 8 wherein said diamine is selected from the group consisting of cyclohexanediamine, hexanediamine, phenylenediamine, toluenediamine, diaminodiphenylmethane, xylylenediamine, isophoronediamine, dodecanediamine, diaminodiphenylsulfide, diaminodiphenylsulfone and diaminodiphenyloxide.
Claim 11
Dependent Claim
50 words
The prepreg of claim 8 wherein said diamine co-monomer is selected from the group consisting of cyclohexanediamine, hexanediamine, phenylenediamine, toluenediamine, diaminodiphenylmethane, xylylenediamine, isophoronediamine, dodecanediamine, 3,3'- and 4,4-diaminodiphenylsulfone and diaminodiphenyloxide, and wherein said unsaturated co-monomer is a bis-unsaturated co-monomer selected from the group consisting of diallylphthalate, 2,2'-diallybisphenol A, and 2,2'-dipropenylbisphenol A.
Claim 12
Dependent Claim
28 words
The prepreg of claim 1 wherein said maleimide-group-containing resin comprises a mixture of the bismaleimides of dodecanediamine and diaminodiphenylmethane and the reaction products of these bis-maleimides with diaminodiphenylmethane.
Claim 13
Dependent Claim
19 words
The prepreg of claim 1 wherein said fiber reinforcement comprises woven or unidirectional carbon/graphite fiber yarn, cloth or tape.
Claim 14
Dependent Claim
19 words
The prepreg of claim 2 wherein said fiber reinforcement comprises woven or unidirectional carbon/graphite fiber yarn, cloth or tape.
Claim 15
Dependent Claim
19 words
The prepreg of claim 5 wherein said fiber reinforcement comprises woven or unidirectional carbon/graphite fiber yarn, cloth or tape.
Claim 16
Dependent Claim
19 words
The prepreg of claim 7 wherein said fiber reinforcement comprises woven or unidirectional carbon/graphite fiber yarn, cloth or tape.
Claim 17
Dependent Claim
19 words
The prepreg of claim 11 wherein said fiber reinforcement comprises woven or unidirectional carbon/graphite fiber yarn, cloth or tape.
Claim 18
Dependent Claim
12 words
The prepreg of claim 1 wherein said prepreg is a structural adhesive.
Claim 19
Dependent Claim
45 words
A heat-curable, release-paper-backed maleimide-group-containing resin film assembly, comprising (a) a heat-curable resin film comprising (i) a maleimide-group-containing resin, and (ii) an effective amount of a catalyst comprising an organophosphine, organophosphonium salt, or complex thereof; and (b) a release-paper backing strippably adherent to said resin film.
Claim 20
Dependent Claim
45 words
A heat-curable, release-paper-backed maleimide-group-containing resin film assembly, comprising (a) a heat-curable resin film comprising (i) a maleimide-group-containing resin, and (ii) an effective amount of a catalyst comprising an organophosphine, organophosphonium salt, or complex thereof; and (b) a release-paper backing strippably adherent to said resin film.
Claim 21
Dependent Claim
28 words
The film of claim 18 wherein said catalyst is present in an amount of from 0.05 percent to about 1.0 percent by weight relative to the film weight.
Claim 22
Dependent Claim
11 words
The film of claim 19 further comprising (d) an unsaturated co-monomer.
Claim 23
Dependent Claim
22 words
The film of claim 20 wherein said unsaturated co-monomer is selected from the group consisting of diallylphthalate, 2,2'-diallylbisphenol A, and 2,2'-dipropenylbisphenol A.
Claim 24
Dependent Claim
11 words
The film of claim 18 wherein said film is an adhesive.
Claim 25
Dependent Claim
58 words
A multilayer fiber-reinforced composite, prepared by the process of (a) removing the release paper from the fiber-reinforced prepreg of claim 1 (b) (ii); (b) assembling a multiplicity of said prepregs of step (a) into a multilayer structure; (c) curing said structure (b), at an elevated temperature effective to activate sadi catalyst, into an integral and substantially unitary structure.
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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |