US4992325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic whisker containing impact enhanced prepregs and formulations formulations
Assignee: Henkel Loctite Corp
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Filing: 1987-12-15
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Granted: 1991-02-12
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Expires: 2007-12-15
Abstract
Abstract A prepeg formulation comprising prepreg filament fibers unidirectionally aligned, and/or woven and nonwoven fabrics, a thermosetting matrix resin and a small amount of well dispersed inorganic whiskers in the resin, alone or in combination with extremely fine fibers of a thermoformable polymer having at least one of a T m or T g greater than about 300° C. or no T m or T g and a decomposition temperature greater than about 300° C. The preferred matrix resin is a blend of a thermosetting epoxy resin and an amorphous thermoplastic polymer having a T g greater than about 195° C.
Inventors
- 👤 Yang S. Kim
- 👤 Paul A. Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:52
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/047; C08J5/24; C08J5/249; C08L; C08L63/00; C08J2363/00; C08J2400/00; C08J2400/22; C08J2481/00; C08J2481/06; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/254; Y10T428/259; Y10T428/30; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3528; Y10T442/3545
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
112 words
A prepreg formulation comprising prepreg fabric and filament fibers unidirectionally aligned, a thermosetting matrix resin of a mixed resin of a thermosetting epoxy resin and an amorphous thermoplastic polymer having a T g greater than about 195° C., a small amount of inorganic whiskers, from the group of carbon whiskers, silicon carbide whiskers, silicon nitride whiskers, and ceramic whiskers, incorporated throughout the resin matrix and a thin surface layer of extremely fine fibers, fibrids or particles of a thermoformable polymer having at least one of a T m or T g greater than about 300° C. or no T m or T g and a decomposition temperature greater than about 300° C.
Claim 2
Dependent Claim
112 words
A prepreg formulation comprising prepreg fabric and filament fibers unidirectionally aligned, a thermosetting matrix resin of a mixed resin of a thermosetting epoxy resin and an amorphous thermoplastic polymer having a T g greater than about 195° C., a small amount of inorganic whiskers, from the group of carbon whiskers, silicon carbide whiskers, silicon nitride whiskers, and ceramic whiskers, incorporated throughout the resin matrix and a thin surface layer of extremely fine fibers, fibrids or particles of a thermoformable polymer having at least one of a T m or T g greater than about 300° C. or no T m or T g and a decomposition temperature greater than about 300° C.
Claim 3
Dependent Claim
23 words
The prepreg formulation of claim 1 wherein the amorphous thermoplastic polymer is one or more of a polyethersulfone, a polyarylsulfone and a polyetherimide.
Claim 4
Dependent Claim
29 words
The prepreg formulation of claim 1 wherein the amount of whiskers employed ranges from about 0.5 to about 5.0 weight % of the weight of the thermosetting matrix resin.
Claim 5
Dependent Claim
32 words
The prepreg formulation of claim 1 wherein the extremely fine fiber is present in an amount of about 0.25 to about 5 weight % based on the weight of the matrix resin.
Claim 6
Dependent Claim
18 words
The prepreg formulation of claim 1 wherein there is present a small amount of a chromium (III) complex.
Claim 7
Dependent Claim
17 words
The prepreg formulation of claim 1 wherein the epoxy resin comprises a low viscosity glycidyl epoxy resin.
Claim 8
Dependent Claim
24 words
The prepreg formulation of claim 2 wherein there is present small amount of a thermoplastic having a T g less than about 195° C.
Claim 9
Dependent Claim
11 words
The prepreg formulation of claim 3 wherein the whiskers are ceramic.
Claim 10
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 1.
Claim 11
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 2.
Claim 12
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 3.
Claim 13
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 4.
Claim 14
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 5.
Claim 15
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 6.
Claim 16
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 7.
Claim 17
Dependent Claim
10 words
A laminate formed of the prepreg formulations of claim 8.
References Cited (Backward Citations)
US4579885A
Cited
US4560603A
Cited
US4690860A
Cited
US4713283A
Cited
US4604319A
Cited
US4604319B1
Cited
JPS61268441A
Cited
US4778716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |