Patent US4550129A successfully refreshed from Google Patents.
US4550129A
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Toughening reinforced epoxy composites with brominated polymeric additives
Assignee: United States, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION THE, Administrator of
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Filing: 1983-05-12
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Granted: 1985-10-29
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Expires: 2003-05-12
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 precure 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
2026-11-09 02:14
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/38; C08G59/02; C08G59/12; C08G59/22; C08G59/226; C08L; C08L63/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 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.
Claim 2
Dependent Claim
60 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.
Claim 3
Dependent Claim
36 words
The epoxy resin composition of claim 1 wherein the brominated diglycidyl additive is selected from diglycidyl tetrabromo bisphenol A and diglycidyl poly(tetrabromo bisphenol (A) having an epoxy equivalency value of from about 250 to about 1500.
Claim 4
Dependent Claim
21 words
The resin composition of claim 1 additionally comprising a pre-formed copolymer of said brominated diglycidyl addition with said polyfunctional epoxy resin.
Claim 5
Dependent Claim
25 words
The epoxy resin composition of claim 2 wherein the epoxy resin is TEN epoxy resin and the brominated diglycidyl additive is diglycidyl tetrabromo bisphenol A.
Claim 6
Dependent Claim
25 words
The epoxy resin composition of claim 2 wherein the epoxy resin is TGDDM epoxy resin and the brominated diglycidyl additive is diglycidyl tetrabromo bisphenol A.
Claim 7
Dependent Claim
37 words
The epoxy resin composition of claim 2 wherein the epoxy resin is TEN epoxy resin and the brominated diglycidyl additive is diglycidyl poly(tetrabromo bisphenol A) having an epoxy equivalency value of from about 250 to about 1500.
Claim 8
Dependent Claim
37 words
The epoxy resin composition of claim 2 wherein the epoxy resin is TGDDM epoxy resin and the brominated diglycidyl additive is diglycidyl poly(tetrabromo bisphenol A) having an epoxy equivalency value of from about 250 to about 1500.
Claim 9
Dependent Claim
77 words
An epoxy resin composition comprising 10 parts of 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.
Claim 10
Dependent Claim
77 words
An epoxy resin composition comprising 10 parts of 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.
Claim 11
Dependent Claim
13 words
A tough cured epoxy resin body comprising the composition of claim 8, cured.
Claim 12
Dependent Claim
11 words
The cured epoxy resin body of claim 9 additionally comprising reinforcement.
Claim 13
Dependent Claim
27 words
The cured epoxy resin body of claim 10 wherein said reinforcement is selected from glass fiber, graphite fiber, aramid fiber, boron nitride fiber and silicon carbide fiber.
Claim 14
Dependent Claim
14 words
The cured epoxy resin body of claim 11 in the form of a laminate.
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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |