Patent US4375530A successfully refreshed from Google Patents.
US4375530A
Expired / Lapsed
US
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Polyester of 2,6-naphthalene dicarboxylic acid, 2,6-dihydroxy naphthalene, terephthalic acid, and hydroquinone capable of forming an anisotropic melt
Assignee: Celanese Corp
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Filing: 1982-07-06
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Granted: 1983-03-01
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Expires: 2002-07-06
Abstract
Abstract A novel wholly aromatic polyester is provided which contains specified concentrations of recurring 2,6-dicarboxynaphthalene moiety, 2,6-dioxynaphthalene moiety, terephthaloyl moiety, and 1,4-dioxybenzene moiety. It has been found that such polyester is capable of exhibiting an anisotropic melt phase which is readily melt processable to form quality fibers, films, molded articles, etc. The absence in the polymer chain of moieties derived from hydroxy acids has been found to yield a highly linear more extended polymer chain along the polyester which contributes to the stiffness characteristics of shaped articles comprising the same.
Inventors
- 👤 Ian L. Hay
- 👤 Anthony J. East
- 👤 Gordon W. Calundann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:13
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/197
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
A melt processable polyester capable of forming an anisotropic melt phase at a temperature below approximately 350° C. consisting essentially of the recurring moieties I, II, III, and IV which are free of ring substitution wherein: ##STR9## wherein said polyester comprises approximately 20 to 30 mole percent of moiety I, approximately 20 to 30 mole percent of moiety II, approximately 20 to 30 mole percent of moiety III, and approximately 20 to 30 mole percent of moiety IV, and wherein the total molar concentration of moieties I and III is substantially identical to the total molar concentration of moieties II and IV.
Claim 2
Dependent Claim
102 words
A melt processable polyester capable of forming an anisotropic melt phase at a temperature below approximately 350° C. consisting essentially of the recurring moieties I, II, III, and IV which are free of ring substitution wherein: ##STR9## wherein said polyester comprises approximately 20 to 30 mole percent of moiety I, approximately 20 to 30 mole percent of moiety II, approximately 20 to 30 mole percent of moiety III, and approximately 20 to 30 mole percent of moiety IV, and wherein the total molar concentration of moieties I and III is substantially identical to the total molar concentration of moieties II and IV.
Claim 3
Dependent Claim
24 words
A melt processable polyester according to claim 1 which is capable of forming an anisotropic melt phase at a temperature below approximately 340° C.
Claim 4
Dependent Claim
28 words
A melt processable polyester according to claim 1 which is capable of exhibiting a differential scanning calorimeter melting temperature in the range of approximately 310° to 340° C.
Claim 5
Dependent Claim
32 words
A melt processable polyester according to claim 1 which exhibits an inherent viscosity of at least 3.5 when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C.
Claim 6
Dependent Claim
33 words
A melt processable polyester according to claim 1 which exhibits an inherent viscosity of approximately 3.5 to 12 when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C.
Claim 7
Dependent Claim
13 words
A fiber which has been melt spun from the polyester of claim 1.
Claim 8
Dependent Claim
13 words
A film which has been melt extruded from the polyester of claim 1.
Claim 9
Dependent Claim
9 words
A molded article comprising the polyester of claim 1.
Claim 10
Dependent Claim
25 words
A molding compound comprising the polyester of claim 1 which incorporates approximately 1 to 60 percent by weight of a solid filler and/or reinforcing agent.
Claim 11
Dependent Claim
70 words
A melt processable polyester capable of forming an anisotropic melt phase at a temperature below approximately 350° C. consisting essentially of the recurring moieties I, II, III, and IV which are free of ring substitution wherein: ##STR10## wherein said polyester comprises approximately 25 mole percent of moiety I, approximately 25 mole percent of moiety II, approximately 25 mole percent of moiety III, and approximately 25 mole percent of moiety IV.
Claim 12
Dependent Claim
70 words
A melt processable polyester capable of forming an anisotropic melt phase at a temperature below approximately 350° C. consisting essentially of the recurring moieties I, II, III, and IV which are free of ring substitution wherein: ##STR10## wherein said polyester comprises approximately 25 mole percent of moiety I, approximately 25 mole percent of moiety II, approximately 25 mole percent of moiety III, and approximately 25 mole percent of moiety IV.
Claim 13
Dependent Claim
24 words
A melt processable polyester according to claim 10 which is capable of forming an anisotropic melt phase at a temperature below approximately 340° C.
Claim 14
Dependent Claim
28 words
A melt processable polyester according to claim 10 which is capable of exhibiting a differential scanning calorimeter melting temperature in the range of approximately 310° to 340° C.
Claim 15
Dependent Claim
32 words
A melt processable polyester according to claim 10 which exhibits an inherent viscosity of at least 3.5 when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C.
Claim 16
Dependent Claim
33 words
A melt processable polyester according to claim 10 which exhibits an inherent viscosity of approximately 3.5 to 12 when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C.
Claim 17
Dependent Claim
13 words
A fiber which has been melt spun from the polyester of claim 10.
Claim 18
Dependent Claim
13 words
A film which has been melt extruded from the polyester of claim 10.
Claim 19
Dependent Claim
9 words
A molded article comprising the polyester of claim 10.
Claim 20
Dependent Claim
25 words
A molding compound comprising the polyester of claim 10 which incorporates approximately 1 to 60 percent by weight of a solid filler and/or reinforcing agent.
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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) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |