US4083829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt processable thermotropic wholly aromatic polyester
Assignee: Celanese Corp
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Filing: 1977-04-20
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Granted: 1978-04-11
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Expires: 1997-04-20
Abstract
Abstract A wholly aromatic polyester is provided which has been found to be highly amenable to melt extrusion to yield high performance fibers. Such fibers following thermal treatment exhibit high tenacity and tensile modulus properties which are well retained at elevated temperatures while exhibiting a low degree of shrinkage. Unlike wholly aromatic polyesters normally encountered in the prior art, the polymer of the present invention is not intractable and may be melt extruded with ease at temperatures below approximately 300° C., and preferably below approximately 280° C. The aromatic polyester of the present invention consists essentially of recurring units (a) p-oxybenzoyl moiety, (b) 2,6-dicarboxynaphthalene moiety, (c) symmetrical dioxy aryl moiety (as defined), and (d) isophthaloyl moiety and/or metal-dioxy phenylene moiety, and is free of units which possess ring substitution. The wholly aromatic polyester of the present invention forms an atypical thermotropic melt phase which is exhibited in the absence of ring substitution at a relatively low temperature which facilitates fiber formation with ease. The wholly aromatic polyester of the present invention following melt spinning and thermal treatment commonly can exhibit an average single filament tenacity of at least 15 grams per denier, and an average single filament tensile modulus of at least 300 grams per denier.
Inventors
- 👤 Gordon W. Calundann
- 👤 Herbert L. Davis
- 👤 Frederick J. Gorman
- 👤 Robert M. Mininni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; C; C08; C08G; C08G63/00; C08G63/02; C08G63/60
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
125 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR11## III is a symmetrical dioxy aryl moiety of the formula where Ar is a divalent radical comprising at least one aromatic ring, and Iv is selected from the group consisting of ##STR12## and mixtures of (a) and (b), and wherein said polyester comprises approximately 20 to 70 mole percent of moiety I, approximately 3 to 30 mole percent of moiety II, approximately 7.5 to 40 mole percent of moiety III, and approximately 4 to 30 mole percent of moiety IV, and wherein each of said moieties is free of ring substitution.
Claim 2
Dependent Claim
125 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR11## III is a symmetrical dioxy aryl moiety of the formula where Ar is a divalent radical comprising at least one aromatic ring, and Iv is selected from the group consisting of ##STR12## and mixtures of (a) and (b), and wherein said polyester comprises approximately 20 to 70 mole percent of moiety I, approximately 3 to 30 mole percent of moiety II, approximately 7.5 to 40 mole percent of moiety III, and approximately 4 to 30 mole percent of moiety IV, and wherein each of said moieties is free of ring substitution.
Claim 3
Dependent Claim
24 words
An improved melt processable wholly aromatic polyester according to claim 1 which is capable of forming a thermotropic melt phase below approximately 280° C.
Claim 4
Dependent Claim
30 words
An improved melt processable wholly aromatic polyester according to claim 1 wherein said symmetrical dioxy aryl moiety is selected from the group consisting of: ##STR13## and mixtures of the foregoing.
Claim 5
Dependent Claim
16 words
An improved melt processable wholly aromatic polyester according to claim 1 wherein moiety IV is ##STR14##
Claim 6
Dependent Claim
15 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 1.
Claim 7
Dependent Claim
19 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 1 and subsequently thermally treated.
Claim 8
Dependent Claim
75 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300° C. consisting of the recurring moieties I, II, III, and IV wherein: ##STR15## and wherein said polyester comprises approximately 40 to 60 mole percent of moiety I, approximately 3 to 15 mole percent of moiety II, approximately 20 to 30 mole percent of moiety III, and approximately 10 to 27 mole percent of moiety IV.
Claim 9
Dependent Claim
75 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300° C. consisting of the recurring moieties I, II, III, and IV wherein: ##STR15## and wherein said polyester comprises approximately 40 to 60 mole percent of moiety I, approximately 3 to 15 mole percent of moiety II, approximately 20 to 30 mole percent of moiety III, and approximately 10 to 27 mole percent of moiety IV.
Claim 10
Dependent Claim
15 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 7.
Claim 11
Dependent Claim
19 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 7 and subsequently thermally treated.
Claim 12
Dependent Claim
126 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR16## III is a symmetrical dioxy aryl moiety of the formula where Ar is a divalent radical comprising at least one aromatic ring, and Iv is selected from the group consisting of ##STR17## and mixtures of (a) and (b), and wherein said polyester comprises approximately 40 to 70 mole percent of moiety I, approximately 7.5 to 30 mole percent of moiety II, approximately 7.5 tp 30 mole percent of moiety III, and approximately 4 to 20 mole percent of moiety IV, and wherein each moiety of said polyester is free of ring substitution.
Claim 13
Dependent Claim
126 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300° C. consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR16## III is a symmetrical dioxy aryl moiety of the formula where Ar is a divalent radical comprising at least one aromatic ring, and Iv is selected from the group consisting of ##STR17## and mixtures of (a) and (b), and wherein said polyester comprises approximately 40 to 70 mole percent of moiety I, approximately 7.5 to 30 mole percent of moiety II, approximately 7.5 tp 30 mole percent of moiety III, and approximately 4 to 20 mole percent of moiety IV, and wherein each moiety of said polyester is free of ring substitution.
Claim 14
Dependent Claim
24 words
An improved melt processable wholly aromatic polyester according to claim 10 which is capable of forming a thermotropic melt phase below approximately 280° C.
Claim 15
Dependent Claim
30 words
An improved melt processable wholly aromatic polyester according to claim 10 wherein said symmetrical dioxy aryl moiety is selected from the group consisting of: ##STR18## and mixtures of the foregoing.
Claim 16
Dependent Claim
16 words
An improved melt processable wholly aromatic polyester according to claim 10 wherein moiety IV is ##STR19##
Claim 17
Dependent Claim
15 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 10.
Claim 18
Dependent Claim
19 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 10, and subsequently thermally treated.
Claim 19
Dependent Claim
90 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximatey 300° C. consisting of the recurring moieties I, II, III, and IV wherein: ##STR20## IV is selected from the group consisting of ##STR21## and mixtures of (a) and (b), and wherein said polyester comprises approximately 40 to 70 mole percent of moiety I, approximately 7.5 to 30 mole percent of moiety II, approximately 7.5 to 30 mole percent of moiety III, and approximately 4 to 20 mole percent of moiety IV.
Claim 20
Dependent Claim
90 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximatey 300° C. consisting of the recurring moieties I, II, III, and IV wherein: ##STR20## IV is selected from the group consisting of ##STR21## and mixtures of (a) and (b), and wherein said polyester comprises approximately 40 to 70 mole percent of moiety I, approximately 7.5 to 30 mole percent of moiety II, approximately 7.5 to 30 mole percent of moiety III, and approximately 4 to 20 mole percent of moiety IV.
Claim 21
Dependent Claim
16 words
An improved melt processable wholly aromatic polyester according to claim 16 wherein moiety IV is ##STR22##
Claim 22
Dependent Claim
43 words
An improved melt processable wholly aromatic polyester according to claim 17 which consists of approximately 60 mole percent of moiety I, approximately 10 mole percent of moiety II, approximately 20 mole percent of moiety III, and approximately 10 mole percent of moiety IV.
Claim 23
Dependent Claim
16 words
An improved melt processable wholly aromatic polyester according to claim 16 wherein moiety IV is ##STR23##
Claim 24
Dependent Claim
43 words
An improved melt processable wholly aromatic polyester according to claim 19 which consists of approximately 60 mole percent of moiety I, approximately 20 mole percent of moiety II, approximately 15 mole percent of moiety III, and approximately 5 mole percent of moiety IV.
Claim 25
Dependent Claim
51 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 16 and subsequently thermally treated, which exhibits an average single filament tenacity of at least 15 grams per denier and an average single filament tensile modulus of at least 300 grams per denier measured at ambient conditions.
Claim 26
Dependent Claim
15 words
A fiber according to claim 21 which has been thermally treated in an inert atmosphere.
Claim 27
Dependent Claim
15 words
A fiber according to claim 21 which has been thermally treated in an oxygen-containing atmosphere.
References Cited (Backward Citations)
US3637595A
Cited
US3890256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |