Patent US4588778A successfully refreshed from Google Patents.
US4588778A
Expired / Lapsed
US
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Toughening reinforced epoxy composites with brominated polymeric additives
Assignee: National Aeronautics and Space Administration
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Filing: 1985-08-15
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Granted: 1986-05-13
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Expires: 2005-08-15
Abstract
Abstract Cured polyfunctional epoxy resins including tris(hydroxyphenyl)methane triglycidyl ether are toughened by addition of polybrominated polymeric additives having an EE below 1500 to the pre-cure composition. Carboxy-terminated butadiene-acrylonitrile rubber is optionally present in the pre-cure mixture as such or as a pre-formed copolymer with other reactants. Reinforced composites, particularly carbon-reinforced composites, of these resins are disclosed and shown to have improved toughness.
Inventors
- 👤 Zohar Nir
- 👤 William J. Gilwee, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:48
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/38; C08G59/02; C08G59/12; C08G59/22; C08G59/226; C08G59/40; C08G59/42; C08G59/4246; C08G59/4261
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
An epoxy resin composition comprising a polyfunctional epoxy resin selected from the group consisting of TEN epoxy resin of formula: ##STR8## TGDDM epoxy resin of formula: ##STR9## and mixtures thereof admixed with a toughening amount of a brominated diglycidyl additive having an epoxy equivalence of from about 250 to about 1500 and a bromine content of about 50% by weight, said epoxy resin composition additionally comprising a pre-formed copolymer of said brominated digycidyl additive with carboxy-terminated butadiene acrylonitrile rubber.
Claim 2
Dependent Claim
79 words
An epoxy resin composition comprising a polyfunctional epoxy resin selected from the group consisting of TEN epoxy resin of formula: ##STR8## TGDDM epoxy resin of formula: ##STR9## and mixtures thereof admixed with a toughening amount of a brominated diglycidyl additive having an epoxy equivalence of from about 250 to about 1500 and a bromine content of about 50% by weight, said epoxy resin composition additionally comprising a pre-formed copolymer of said brominated digycidyl additive with carboxy-terminated butadiene acrylonitrile rubber.
Claim 3
Dependent Claim
17 words
The epoxy resin composition of claim 1 wherein said epoxy resin composition additionally comprises carboxy-terminated butadiene-nitrile rubber.
Claim 4
Dependent Claim
93 words
A cured epoxy resin composite comprising the cured product of the admixture comprising 10 parts of a polyfunctional epoxy resin selected from the group consisting of TEN resin of formula: ##STR10## and TGDDM resin of formula ##STR11## and mixtures thereof, from 6 to 12 parts of brominated diglycidyl additive selected from diglycidyl tetrabromo bisphenol A and diglycidyl poly(tetrabromo bisphenol A) having an epoxy equivalency value of from about 250 to about 1000 and from 0.65 to 1.2 equivalents, basis epoxy, of an amine-containing epoxy curing agent, said admixture additionally comprising carboxy-terminated butadiene-nitrile rubber.
Claim 5
Dependent Claim
93 words
A cured epoxy resin composite comprising the cured product of the admixture comprising 10 parts of a polyfunctional epoxy resin selected from the group consisting of TEN resin of formula: ##STR10## and TGDDM resin of formula ##STR11## and mixtures thereof, from 6 to 12 parts of brominated diglycidyl additive selected from diglycidyl tetrabromo bisphenol A and diglycidyl poly(tetrabromo bisphenol A) having an epoxy equivalency value of from about 250 to about 1000 and from 0.65 to 1.2 equivalents, basis epoxy, of an amine-containing epoxy curing agent, said admixture additionally comprising carboxy-terminated butadiene-nitrile rubber.
Claim 6
Dependent Claim
11 words
The cured epoxy resin composite of claim 3 additionally comprising reinforcement.
Claim 7
Dependent Claim
27 words
The cured epoxy resin composite of claim 4 wherein said reinforcement is selected from glass fiber, graphite fiber, aramid fiber, boron nitride fiber and silicon carbide fiber.
Claim 8
Dependent Claim
18 words
The cured epoxy resin composite of claim 5 wherein said reinforcement is in the form of a laminate.
Claim 9
Dependent Claim
14 words
The cured epoxy resin composite of claim 6 wherein said reinforcement is graphite fiber.
References Cited (Backward Citations)
US3947522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |