Patent US4651692A successfully refreshed from Google Patents.
Patent US4835047A successfully refreshed from Google Patents.
US4835047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wholly aromatic polyester fiber-reinforced polyetherimide composite and process for preparing same
Assignee: University of Akron
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Filing: 1987-05-14
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Granted: 1989-05-30
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Expires: 2007-05-14
Abstract
Abstract Novel self-reinforced polymer composites of polyetherimide and a melt processable wholly aromatic polyester are prepared according to this invention. The wholly aromatic polyester exhibits anisotropic properties in the melt phase. Mixing is carried out at a temperature at which both the polyetherimide and the wholly aromatic polyester are melt processable. The products of this invention comprise about 35 to 95 percent by weight of wholly aromatic polyester, which is in the form of predominantly unidirectionally oriented continuous fibers primarily in the range of about 1 to 10 micrometers in diameter, distributed in a matrix of polyetherimide. The polymer composites of this invention have high tensile strength, high modulus, satisfactory elongation, good impact strength, and good high temperature properties.
Inventors
- 👤 Avraam Isayev
- 👤 Suresh Swaminathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:21
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08L; C08L67/00; C08L67/02; C08L67/04; C08L79/00; C08L79/04; C08L79/08; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249947; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A self-reinforced polymer composite comprising: (a) from 60 to about 5 percent by weight, based on total polymer weight, of polyetherimide, and (b) from 40 to about 95 percent by weight, based on total polymer weight, of a melt processable wholly aromatic polyester which is anisotropic in the melt phase, said polyester being essentially in the form of long, continuous, predominantly unidirectionally oriented fibers which are formed in situ in a matrix of said polyetherimide.
Claim 2
Dependent Claim
75 words
A self-reinforced polymer composite comprising: (a) from 60 to about 5 percent by weight, based on total polymer weight, of polyetherimide, and (b) from 40 to about 95 percent by weight, based on total polymer weight, of a melt processable wholly aromatic polyester which is anisotropic in the melt phase, said polyester being essentially in the form of long, continuous, predominantly unidirectionally oriented fibers which are formed in situ in a matrix of said polyetherimide.
Claim 3
Dependent Claim
38 words
A polymer composite according to claim 1 comprising from 60 to about 25 percent by weight of said polyetherimide and from 40 to about 75 percent by weight of said wholly aromatic polyester, based on total polymer weight.
Claim 4
Dependent Claim
40 words
A polymer composite according to claim 1 comprising from about 50 to about 25 percent by weight of said polyetherimide and from about 50 to about 75 percent by weight of said wholly aromatic polyester, based on total polymer weight.
Claim 5
Dependent Claim
15 words
A polymer composite according to claim 1 in which said wholly aromatic polyester is thermotropic.
Claim 6
Dependent Claim
24 words
A polymer composite according to claim 1 containing at least about 50% by weight of said wholly aromatic polyester, based on total polymer weight.
Claim 7
Dependent Claim
12 words
A molded composite article formed from the polymer composite of claim 1.
Claim 8
Dependent Claim
14 words
A fiber which has been melt spun from the polymer composite of claim 1.
Claim 9
Dependent Claim
14 words
A film which has been melt extruded from the polymer composite of claim 1.
Claim 10
Dependent Claim
140 words
A process for preparing a self-reinforced polymer composite comprising a polyetherimide and a melt processable wholly aromatic polyester which is antisotropic in the melt phase, which comprises mixing said polyetherimide with from 40 to about 95 percent by weight, based on total polymer weight, of said melt processable wholly aromatic polyester at a temperature at which both polymers are melt processable, and under mixing conditions effective to give, on cooling, a polymer composite in which the wholly aromatic polyester is present in the form of predominantly unidirectionally oriented fibers in a matrix of said polyetherimide, extruding the resulting blend in the melt phase, cooling the blend and recovering a self-reinforced polymer composite comprising said polyetherimide and said wholly aromatic polyester, said wholly aromatic polyester being in the form of continuous predominantly unidirectionally oriented fibers in a matrix of said polyetherimide.
Claim 11
Dependent Claim
140 words
A process for preparing a self-reinforced polymer composite comprising a polyetherimide and a melt processable wholly aromatic polyester which is antisotropic in the melt phase, which comprises mixing said polyetherimide with from 40 to about 95 percent by weight, based on total polymer weight, of said melt processable wholly aromatic polyester at a temperature at which both polymers are melt processable, and under mixing conditions effective to give, on cooling, a polymer composite in which the wholly aromatic polyester is present in the form of predominantly unidirectionally oriented fibers in a matrix of said polyetherimide, extruding the resulting blend in the melt phase, cooling the blend and recovering a self-reinforced polymer composite comprising said polyetherimide and said wholly aromatic polyester, said wholly aromatic polyester being in the form of continuous predominantly unidirectionally oriented fibers in a matrix of said polyetherimide.
Claim 12
Dependent Claim
29 words
A process according to claim 9 in which the amount of said wholly aromatic polyester is from 40 to about 75 percent by weight, based on total polymer weight.
Claim 13
Dependent Claim
30 words
A process according to claim 9 in which the amount of said wholly aromatic polyester is from about 50 to about 75 percent by weight, based on total polymer weight.
Claim 14
Dependent Claim
27 words
A process according to claim 9 in which the mixing temperature of said polyetherimide and said wholly aromatic polyester is from about 300° to about 350° C.
Claim 15
Dependent Claim
14 words
A process according to claim 9 in which said wholly aromatic polyester is thermotropic.
Claim 16
Dependent Claim
45 words
A process according to claim 5 in which particles of said polyetherimide and said wholly aromatic polyester are mixed under conditions forming a physical mixture of said particles and then dried prior to said mixing at a temperature at which both polymers are melt processable.
Claim 17
Dependent Claim
27 words
A process according to claim 9 in which the amount of said wholly aromatic polyester is at least about 50% by weight, based on total polymer weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |