Patent US4419478A successfully refreshed from Google Patents.
US4656207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy thermosets having improved toughness
Assignee: Hexcel Corp
•
Filing: 1985-02-19
•
Granted: 1987-04-07
•
Expires: 2005-02-19
Abstract
Abstract Disclosed is a stiff, tough thermoset composite, the composite comprising a crosslinked epoxy resin matrix and high strength filaments. The resin matrix comprises a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout the resin matrix. Volume fractions of the discontinuous phase are at least about 35% of the total volume of the continuous and discontinuous phases combined in exceptionally tough composites. Also disclosed are novel resin compositions suitable for making these thermosets.
Inventors
- 👤 Harold Jabloner
- 👤 Brian J. Swetlin
- 👤 Sung G. Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:49
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5033; C08G59/56; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08L; C08L63/00; C08J2363/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0326; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S525/00; Y10S525/906; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
67 words
A thermoset comprising a crosslinked epoxy resin matrix with a fracture toughness, K IC , of at least 1.0 MPam 1/2 , a Tg of at least 125° C. and comprising a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout said resin matrix, said discontinuous phase constituting at least about 35 volume % of the total volume of said discontinuous and continuous phases.
Claim 2
Dependent Claim
67 words
A thermoset comprising a crosslinked epoxy resin matrix with a fracture toughness, K IC , of at least 1.0 MPam 1/2 , a Tg of at least 125° C. and comprising a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout said resin matrix, said discontinuous phase constituting at least about 35 volume % of the total volume of said discontinuous and continuous phases.
Claim 3
Dependent Claim
14 words
A thermoset in accordance with claim 1, wherein said matrix contains high strength filaments.
Claim 4
Dependent Claim
14 words
A thermoset in accordance with claim 1, wherein said matrix contains carbon (graphite) fiber.
Claim 5
Dependent Claim
28 words
A thermoset in accordance with claim 1, wherein said discontinuous phase constitutes between about 45% and about 55% of the total volume of the discontinuous and continuous phases.
Claim 6
Dependent Claim
28 words
A thermoset in accordance with claim 1, wherein said continuous phase exhibits a higher electron density than said continuous phase upon staining said matrix with RuO 4 .
Claim 7
Dependent Claim
24 words
A thermoset in accordance with claim 1, wherein said discontinuous phase comprises domains having a largest dimension of between about 0.1 and 5 microns.
Claim 8
Dependent Claim
90 words
A thermoset composite comprising a crosslinked epoxy resin matrix containing high strength filaments or fibers, said matrix having a fracture toughness, K IC , of at least 1.0 MPam 1/2 and a Tg of at least 125° C., and comprising a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout said matrix, said continuous phase exhibiting a higher electron density than said discontinuous phase upon staining said matrix with RuO 4 and constituting at least about 35% of the total volume of said discontinuous and continuous phases.
Claim 9
Dependent Claim
90 words
A thermoset composite comprising a crosslinked epoxy resin matrix containing high strength filaments or fibers, said matrix having a fracture toughness, K IC , of at least 1.0 MPam 1/2 and a Tg of at least 125° C., and comprising a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout said matrix, said continuous phase exhibiting a higher electron density than said discontinuous phase upon staining said matrix with RuO 4 and constituting at least about 35% of the total volume of said discontinuous and continuous phases.
Claim 10
Dependent Claim
24 words
A thermoset composite in accordance with claim 7, wherein said discontinuous phase comprises domains having a largest dimension between about 0.1 and 5 microns.
Claim 11
Dependent Claim
31 words
A thermoset composite in accordance with claim 8, wherein said discontinuous phase has a volume that is between about 45 and 55% of the total volume of continuous and discontinuous phases.
Claim 12
Dependent Claim
25 words
A thermoset composite in accordance with claim 9, wherein between about 40 and 70% of the total volume of said composite comprises carbon (graphite) fibers.
Claim 13
Dependent Claim
89 words
A thermoset composite comprising a crosslinked epoxy resin matrix containing high strength filaments or fiber, said matrix having a Tg of at least 125° C., and comprising a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout said matrix, said discontinuous phase constituting at least about 35 volume % of the total volume of said continuous and discontinuous phases, said composite having a post impact compression value at an impact energy of 1500 inch-pounds per inch thickness of at least about 30,000 pounds per square inch.
Claim 14
Dependent Claim
89 words
A thermoset composite comprising a crosslinked epoxy resin matrix containing high strength filaments or fiber, said matrix having a Tg of at least 125° C., and comprising a glassy discontinuous phase dispersed in a glassy continuous phase that continues throughout said matrix, said discontinuous phase constituting at least about 35 volume % of the total volume of said continuous and discontinuous phases, said composite having a post impact compression value at an impact energy of 1500 inch-pounds per inch thickness of at least about 30,000 pounds per square inch.
Claim 15
Dependent Claim
24 words
A thermoset composite in accordance with claim 11, wherein said discontinuous phase comprises domains having a largest dimension between about 0.1 and 5 microns.
Claim 16
Dependent Claim
31 words
A thermoset composite in accordance with claim 11, wherein said discontinuous phase has a volume that is between about 45 and 55% of the total volume of continuous and discontinuous phases.
Claim 17
Dependent Claim
25 words
A thermoset composite in accordance with claim 11, wherein between about 40 and 70% of the total volume of said composite comprises carbon (graphite) fibers.
Claim 18
Dependent Claim
25 words
A thermoset composite in accordance with claim 11, wherein said continuous phase exhibits a higher electron density upon staining said matrix with RuO 4 .
Claim 19
Dependent Claim
19 words
A thermoset composite in accordance with claim 15, wherein said higher electron density is attributable to a polysulfone oligomer.
Claim 20
Dependent Claim
17 words
A thermoset composite in accordance with claim 16, wherein said oligomer is concentrated in said continuous phase.
Claim 21
Dependent Claim
30 words
A thermoset composite in accordance with claim 17, wherein said continuous phase comprises between about 45 and 55 volume % of the total volume of said continuous and discontinuous phases.
Claim 22
Dependent Claim
25 words
A thermoset composite in accordance with claim 18, wherein said discontinuous phase comprises domains that have a largest dimension between about 0.1 and 10 microns.
Claim 23
Dependent Claim
21 words
A thermoset composite in accordance with claim 19, wherein said discontinuous phase comprises domains that are spherical or ellipsoidal in configuration.
References Cited (Backward Citations)
GB1306231A
Cited
US3950451A
Cited
US3920768A
Cited
JPS5398400A
Cited
JPS5464599A
Cited
FR2427910A1
Cited
JPS5714889A
Cited
US4330659A
Cited
US4430473A
Cited
EP0126494A1
Cited
EP0127198A1
Cited
EP0130270A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |