US4418164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aramid fiber coated with polyfunctional aziridine
Assignee: EIDP Inc
•
Filing: 1982-07-19
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Granted: 1983-11-29
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Expires: 2002-07-19
Abstract
Abstract Coating of aramid filaments with certain polyfunctional aziridines increases interlaminar shear strength of unsaturated polyester matrix composites.
Inventors
- 👤 Francis M. Logullo, Sr.
- 👤 Yun-Tai Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/48; C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08L; C08L67/00; C08L67/06; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31786; Y10T428/31794
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
Aramid fiber coated with an aziridine of the formula ##STR6## R' is alkyl or hydroxyalkyl of from 1 to 4 carbon atoms; R" and R'" are independently selected from hydrogen and methyl.
Claim 2
Dependent Claim
32 words
Aramid fiber coated with an aziridine of the formula ##STR6## R' is alkyl or hydroxyalkyl of from 1 to 4 carbon atoms; R" and R'" are independently selected from hydrogen and methyl.
Claim 3
Dependent Claim
26 words
Aramid fiber of claim 1 wherein the aziridine is a member of the group consisting of trimethylol propane tris[beta(N-aziridinyl)-propionate], pentaerythritol tris[beta(N-aziridinyl)-propionate], and trimethylol propane tris[beta(N-2-methyl aziridinyl)propionate].
Claim 4
Dependent Claim
11 words
Aramid fiber of claim 2 wherein the aramid is poly(p-phenylene terephthalamide).
Claim 5
Dependent Claim
12 words
Aramid fiber according to claim 3 in the form of continuous filaments.
Claim 6
Dependent Claim
12 words
Aramid fiber according to claim 3 in the form of staple fiber.
Claim 7
Dependent Claim
47 words
A reinforced composite having an unsaturated polyester matrix and an aramid fiber reinforcement, said fiber having been precoated with an aziridine of the formula ##STR7## R' is alkyl or hydroxyalkyl of from 1 to 4 carbon atoms; R" and R'" are independently selected from hydrogen and methyl.
Claim 8
Dependent Claim
47 words
A reinforced composite having an unsaturated polyester matrix and an aramid fiber reinforcement, said fiber having been precoated with an aziridine of the formula ##STR7## R' is alkyl or hydroxyalkyl of from 1 to 4 carbon atoms; R" and R'" are independently selected from hydrogen and methyl.
Claim 9
Dependent Claim
26 words
The composite of claim 6 wherein the aziridine is a member of the group consisting of trimethylol propane tris[beta(N-aziridinyl)-propionate], pentaerythritol tris[beta(N-2-methyl aziridinyl)propionate] and trimethylol propane tris[beta(N-aziridinyl)propionate].
Claim 10
Dependent Claim
16 words
The composite of claim 6 wherein the aramid fiber is poly(p-phenylene terephthalamide) in continuous filament form.
Claim 11
Dependent Claim
16 words
The composite of claim 6 wherein the aramid fiber is poly(p-phenylene terephthalamide) in staple fiber form.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |