US4056506A
Expired / Lapsed
US
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Homogeneous polyepoxide-polyanhydride compositions
Assignee: Quantum Composites Inc
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Filing: 1976-12-08
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Granted: 1977-11-01
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Expires: 1996-12-08
Abstract
Abstract A homogeneous mixture of a polyanhydride and a polyepoxide is prepared by the copolymerization of an olefinically unsaturated monomer capable of polymerization by free-radical means with an olefinically unsaturated monoanhydride and an olefinically saturated polyanhydride in the presence of a polyepoxide and an anhydride accelerator without substantial anhydride-epoxide cross-linking. As an example, reinforcing glass fibers are impregnated with a solution of styrene, maleic anhydride, styrene-maleic anhydride copolymer, a diglycidyl ether of bisphenol A and 1-methylimidazole and the resin is thickened in situ by copolymerization of the styrene, maleic anhydride and styrene-maleic anhydride copolymer to form a moldable, homogeneous mixture of styrene-maleic anhydride copolymer, diglycidyl ether of bisphenol A, 1-methylimidazole and reinforcing glass fibers.
Inventors
- 👤 William J. Heilman
- 👤 Frank C. Peterson
- 👤 Mical C. Renz
- 👤 Leslie P. Theard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:11
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4246; C08G59/4261; C08F; C08F283/00; C08F283/10; C08K; C08K5/00; C08K5/0008; C08K5/0025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
240 words
A handleable, thermosettable composition which comprises a homogeneous resin mixture of polyanhydride molecules, polyepoxide molecules of an epoxy resin having a 1,2-epoxy equivalent value greater than 1, a saturated monoanhydride, a monoepoxy compound, and from about 0.01 to about 10 weight percent of an anhydride accelerator, said polyanhydride comprising the addition copolymer of (1) styrene and (2) maleic anhydride in a molar ratio of styrene (1) to maleic anhydride (2) of about 0.5:1 to about 8:1 and (3) a styrene-maleic anhydride copolymer having between two and about 500 repeating units and a styrene to maleic anhydride ratio between about 1:1 and about 10:1; said saturated monoanhydride selected from phthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, dodecenylsuccinic anhydride, chlorendic anhydride and a mixture of methyl bicyclo(2.2.1)heptane-2,3-dicarboxylic anhydride isomers; the ratio of anhydride equivalents derived from said maleic anhydride (2) to the total sum of the anhydride equivalents in said homogeneous resin mixture being between about 0.2:1 and about 1:1 and the ratio of anhydride equivalents in said saturated monoanhydride to the anhydride equivalents derived from said styrene-maleic anhydride copolymer (3) being between zero and about 1:1; the A/E ratio of total anhydride equivalents to total epoxy equivalents in said composition being between about 0.1:1 to about 2.5:1 and the ratio of epoxy equivalents in the epoxy resin to the epoxy equivalents in the monoepoxy compound being at least about 1:1; and said handleable, thermosettable composition being substantially free of any volatile component.
Claim 2
Dependent Claim
240 words
A handleable, thermosettable composition which comprises a homogeneous resin mixture of polyanhydride molecules, polyepoxide molecules of an epoxy resin having a 1,2-epoxy equivalent value greater than 1, a saturated monoanhydride, a monoepoxy compound, and from about 0.01 to about 10 weight percent of an anhydride accelerator, said polyanhydride comprising the addition copolymer of (1) styrene and (2) maleic anhydride in a molar ratio of styrene (1) to maleic anhydride (2) of about 0.5:1 to about 8:1 and (3) a styrene-maleic anhydride copolymer having between two and about 500 repeating units and a styrene to maleic anhydride ratio between about 1:1 and about 10:1; said saturated monoanhydride selected from phthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, dodecenylsuccinic anhydride, chlorendic anhydride and a mixture of methyl bicyclo(2.2.1)heptane-2,3-dicarboxylic anhydride isomers; the ratio of anhydride equivalents derived from said maleic anhydride (2) to the total sum of the anhydride equivalents in said homogeneous resin mixture being between about 0.2:1 and about 1:1 and the ratio of anhydride equivalents in said saturated monoanhydride to the anhydride equivalents derived from said styrene-maleic anhydride copolymer (3) being between zero and about 1:1; the A/E ratio of total anhydride equivalents to total epoxy equivalents in said composition being between about 0.1:1 to about 2.5:1 and the ratio of epoxy equivalents in the epoxy resin to the epoxy equivalents in the monoepoxy compound being at least about 1:1; and said handleable, thermosettable composition being substantially free of any volatile component.
Claim 3
Dependent Claim
17 words
A handleable, thermosettable composition in accordance with claim 1 having a fibrous substrate incorporated in said composition.
Claim 4
Dependent Claim
27 words
A handleable, thermosettable composition in accordance with claim 2 in which said fibrous substrate comprises glass fibers from about 3 mm. to about 50 mm. in length.
Claim 5
Dependent Claim
45 words
A handleable, thermosettable composition in accordance with claim 3 having a melt viscosity sufficient during compression molding to permit the resin-glass fiber mixture to flow and fill the mold at the molding conditions and produce a uniform distribution of glass fibers in the cured resin.
Claim 6
Dependent Claim
31 words
A handleable, thermosettable composition in accordance with claim 4 in which said melt viscosity is provided by a controlled number of anhydride-epoxy bonds in said resin insufficient to form a gel.
Claim 7
Dependent Claim
19 words
A handleable, thermosettable composition in accordance with claim 3 in which said anhydride accelerator is a tertiary nitrogen compound.
Claim 8
Dependent Claim
86 words
A handleable, thermosettable composition in accordance with claim 3 in which the ratio of styrene (1) to maleic anhydride (2) is about 1:1 to about 4.5:1, the ratio of styrene to maleic anhydride in the styrene-maleic anhydride copolymer (3) is about 1:1 and about 3:1, the said ratio of anhydride equivalents derived from said maleic anhydride (2) to the total sum of the anhydride equivalents in said homogeneous resin mixture is from about 0.4:1 to about 0.9:1, the A/E ratio is about 0.3:1 to about 1.5:1.
Claim 9
Dependent Claim
97 words
A handleable, thermosettable composition in accordance with claim 3 in which the ratio of styrene (1) to maleic anhydride (2) is about 1:1 to about 3:1, the ratio of styrene to maleic anhydride in the styrene-maleic anhydride copolymer (3) is about 1:1 to about 3:1, the said ratio of anhydride equivalents derived from said maleic anhydride (2) to the total sum of the anhydride equivalents in said homogeneous resin mixture is from about 0.5:1 to about 0.8:1 and the polyepoxide is a diglycidyl ether of bisphenol A at an A/E ratio of about 0.5:1 to about 1.3:1.
Claim 10
Dependent Claim
63 words
A handleable, thermosettable composition in accordance with claim 8 in which the ratio of styrene (1) to maleic anhydride (2) is about 2:1, the ratio of styrene to maleic anhydride in the styrene-maleic anhydride copolymer (3) is about 2:1, and the said ratio of anhydride equivalents in said saturated monoanhydride to the anhydride equivalents derived from said styrene-maleic anhydride copolymer (3) is zero.
Claim 11
Dependent Claim
52 words
A handleable, thermosettable composition in accordance with claim 1 comprising glass fibers from about 5 mm. to about 25 mm. in length and comprising from about 10 to about 80 weight percent of said composition and said composition having from about 5 to about 80 weight percent of a particulate filler material.
Claim 12
Dependent Claim
28 words
A handleable, thermosettable composition in accordance with claim 10 in which said glass fibers comprise from about 20 to about 60 weight percent and the particulate filler material
Claim 13
Dependent Claim
18 words
A handleable, thermosettable composition in accordance with claim 1 having a powdered inert filler incorporated in said composition.
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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |