Patent US5268225A successfully refreshed from Google Patents.
US5268225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self reinforced thermoplastic composite laminate
Assignee: University of Akron
•
Filing: 1991-12-02
•
Granted: 1993-12-07
•
Expires: 2011-12-02
Abstract
Abstract Composite laminates are prepared from thin sheets of thermotropic liquid crystal polymer blends. A preferred blend contains 2 thermotropic liquid crystal polymers, i.e., a first liquid crystal polymer in LCP-1, and a second liquid crystal polymer (LCP-2), the second liquid crystal polymer having a higher melting point than the first. The second liquid crystal polymer is molecularly oriented and is preferably at least partially in the form of microscopic fibers in a matrix of the first liquid crystal polymer. The two liquid crystal polymers are phase separated in the solid phase and have overlapping melt processing temperatures.
Inventors
- 👤 Avraam Isayev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:47
CPC Classifications
C; C08; C08L; C08L67/00; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; C09; C09K; C09K19/00; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/50; B32B2307/51; B32B2307/54; B32B2307/558; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A self reinforced composite laminate formed from a plurality of layers of a blend of thermotropic liquid crystal polymers having overlapping processing temperature ranges, said liquid crystal polymers including a first liquid crystal polymer and a second liquid crystal polymer which are incompatible in the solid state, each layer comprising fibers of said second liquid crystal polymer in a matrix of said first liquid crystal polymer, wherein the second liquid crystal polymer has a higher minimum processing temperature than the first liquid crystal polymer and wherein the said blend contains from about 2% to about 98% by weight each of said first and second liquid crystal polymers, based on the total liquid crystal polymer weight in said blend.
Claim 2
Dependent Claim
118 words
A self reinforced composite laminate formed from a plurality of layers of a blend of thermotropic liquid crystal polymers having overlapping processing temperature ranges, said liquid crystal polymers including a first liquid crystal polymer and a second liquid crystal polymer which are incompatible in the solid state, each layer comprising fibers of said second liquid crystal polymer in a matrix of said first liquid crystal polymer, wherein the second liquid crystal polymer has a higher minimum processing temperature than the first liquid crystal polymer and wherein the said blend contains from about 2% to about 98% by weight each of said first and second liquid crystal polymers, based on the total liquid crystal polymer weight in said blend.
Claim 3
Dependent Claim
42 words
A composite laminate according to claim 1 wherein said first liquid crystal polymer and said second liquid crystal polymer each have melting point, the melting points of said second liquid crystal polymer being higher than that of the first liquid crystal polymer.
Claim 4
Dependent Claim
20 words
A composite laminate according to claim 1 wherein at least said first liquid crystal polymer is a wholly aromatic co-polyester.
Claim 5
Dependent Claim
33 words
A composite laminate according to claim 1 wherein said blend contains from about 20% to about 80% each of said first and second liquid crystal polymers, based on total liquid crystal polymer weight.
Claim 6
Dependent Claim
24 words
A composite laminate according to claim 1 wherein said blend consists essentially of said first liquid crystal polymer and said second liquid crystal polymer.
Claim 7
Dependent Claim
45 words
A composite according to claim 1, said laminate being formed from individual sheets of said blend at a lamination temperature which is equal to or above the minimum processing temperature of the first liquid crystal polymer but below that of the second liquid crystal polymer.
Claim 8
Dependent Claim
10 words
A shaped article formed from a laminate of claim 1.
Claim 9
Dependent Claim
25 words
A composite laminate according to claim 1 in which the direction of fiber orientation is different in different layers, whereby said laminate is essentially isotropic.
Claim 10
Dependent Claim
26 words
A composite laminate according to claim 1 in which the direction of fiber orientation in all layers is essentially the same, whereby said laminate is anisotropic.
References Cited (Backward Citations)
US4267289A
Cited
US4650836A
Cited
US4728698A
Cited
US4837268A
Cited
US4820568A
Cited
US4902369A
Cited
WO1991001879A1
Cited
US5070157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |