Patent US4374228A successfully refreshed from Google Patents.
US4374228A
Expired / Lapsed
US
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Wholly aromatic polyester capable of forming an anisotropic melt phase consisting essentially of para-oxybenzoyl moiety, bromo-substituted-para-oxybenzoyl moiety, and meta-oxybenzoyl moiety
Assignee: Celanese Corp
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Filing: 1981-08-03
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Granted: 1983-02-15
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Expires: 2001-08-03
Abstract
Abstract A novel wholly aromatic polyester is provided which exhibits an anisotropic melt phase and which is capable of readily undergoing melt processing. The polyester of the present invention consists essentially of the recurring units (a) paraoxybenzoyl moiety, (b) bromo-substituted-para-oxybenzoyl moiety, and (c) meta-oxybenzoyl moiety. The resulting polymer may be economically produced. Additionally, it may be melt processed at an advantageous temperature which makes possible the utilization of standard equipment such as that heretofore utilized for the melt processing of polyethylene terephthalate.
Inventors
- 👤 Jeffrey T. Langley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6822
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
64 words
A melt processable wholly aromatic polyester capable of forming an anisotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, and III wherein: ##STR8## wherein said polyester comprises approximately 35 to 70 mole percent of moiety I, approximately 15 to 45 mole percent of moiety II, and approximately 15 to 45 mole percent of moiety III.
Claim 2
Dependent Claim
64 words
A melt processable wholly aromatic polyester capable of forming an anisotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, and III wherein: ##STR8## wherein said polyester comprises approximately 35 to 70 mole percent of moiety I, approximately 15 to 45 mole percent of moiety II, and approximately 15 to 45 mole percent of moiety III.
Claim 3
Dependent Claim
26 words
A melt processable wholly aromatic polyester according to claim 1 which is capable of forming an anisotropic melt phase at a temperature below approximately 290° C.
Claim 4
Dependent Claim
26 words
A melt processable wholly aromatic polyester according to claim 1 which is capable of forming an anisotropic melt phase at a temperature below approximately 280° C.
Claim 5
Dependent Claim
33 words
A melt processable wholly aromatic polyester according to claim 1 which is capable of being injection molded to form a three-dimensional shaped article while at a temperature of approximately 240° to 350° C.
Claim 6
Dependent Claim
22 words
A melt processable wholly aromatic polyester according to claim 1 wherein recurring moieties I, II and III are the sole moieties present.
Claim 7
Dependent Claim
34 words
A melt processable wholly aromatic polyester according to claim 1 which exhibits an inherent viscosity of at least 1 dl./gram when dissolved in a concentration of 0.03 weight/volume percent in pentafluorophenol at 60° C.
Claim 8
Dependent Claim
35 words
A melt processable wholly aromatic polyester according to claim 1 which exhibits an inherent viscosity of approximately 1.5 to 4 dl./gram when dissolved in a concentration of 0.03 weight/volume percent in pentafluorophenol at 60° C.
Claim 9
Dependent Claim
29 words
A molding compound comprising the melt processable wholly aromatic polyester of claim 1 which incorporates approximately 1 to 60 percent by weight of a solid filler and/or reinforcing agent.
Claim 10
Dependent Claim
13 words
A molded article comprising the melt processable wholly aromatic polyester of claim 1.
Claim 11
Dependent Claim
64 words
A melt processable wholly aromatic polyester capable of forming an anisotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, and III wherein: ##STR9## wherein said polyester comprises approximately 40 to 50 mole percent of moiety I, approximately 30 to 40 mole percent of moiety II, and approximately 15 to 25 mole percent of moiety III.
Claim 12
Dependent Claim
64 words
A melt processable wholly aromatic polyester capable of forming an anisotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, and III wherein: ##STR9## wherein said polyester comprises approximately 40 to 50 mole percent of moiety I, approximately 30 to 40 mole percent of moiety II, and approximately 15 to 25 mole percent of moiety III.
Claim 13
Dependent Claim
26 words
A melt processable wholly aromatic polyester according to claim 10 which is capable of forming an anisotropic melt phase at a temperature below approximately 290° C.
Claim 14
Dependent Claim
26 words
A melt processable wholly aromatic polyester according to claim 10 which is capable of forming an anisotropic melt phase at a temperature below approximately 280° C.
Claim 15
Dependent Claim
33 words
A melt processable wholly aromatic polyester according to claim 10 which is capable of being injection molded to form a three-dimensional shaped article while at a temperature of approximately 240° to 350° C.
Claim 16
Dependent Claim
21 words
A melt processable wholly aromatic polyester according to claim 10 wherein moieties I, II, and III are the sole moieties present.
Claim 17
Dependent Claim
34 words
A melt processable wholly aromatic polyester according to claim 10 which comprises approximately 50 mole percent of moiety I, approximately 30 mole percent of moiety II, and approximately 20 mole percent of moiety III.
Claim 18
Dependent Claim
34 words
A melt processable wholly aromatic polyester according to claim 10 which comprises approximately 40 mole percent of moiety I, approximately 40 mole percent of moiety II, and approximately 20 mole percent of moiety III.
Claim 19
Dependent Claim
34 words
A melt processable wholly aromatic polyester according to claim 10 which exhibits an inherent viscosity of at least 1 dl./gram when dissolved in a concentration of 0.03 weight/volume percent in pentafluorophenol at 60° C.
Claim 20
Dependent Claim
35 words
A melt processable wholly aromatic polyester according to claim 10 which exhibits an inherent viscosity of approximately 1.5 to 4 dl./gram when dissolved in a concentration of 0.03 weight/volume percent in pentafluorophenol at 60° C.
Claim 21
Dependent Claim
29 words
A molding compound comprising the melt processable wholly aromatic polyester of claim 10 which incorporates approximately 1 to 60 percent by weight of a solid filler and/or reinforcing agent.
Claim 22
Dependent Claim
13 words
A molded article comprising the melt processable wholly aromatic polyester of claim 1.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |