US4130545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt processable thermotropic wholly aromatic polyester comprising both para-oxybenzoyl and meta-oxybenzoyl moieties
Assignee: Celanese Corp
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Filing: 1977-09-12
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Granted: 1978-12-19
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Expires: 1997-09-12
Abstract
Abstract A wholly aromatic polyester is provided which unlike the aromatic polyesters normally encountered in the prior art is not intractable or difficultly tractable and readily undergoes melt processing with ease. The aromatic polyester of the present invention consists essentially of the recurring units (a) p-oxybenzoyl moiety, (b) m-oxybenzoyl moiety, (c) 2,6-dicarboxynaphthalene moiety, and (d) symmetrical dioxy aryl moiety (as defined), and is free of units which possess ring substitution. The resulting polyester exhibits a melting point below approximately 310° C., and preferably below 300° C. The ability of the wholly aromatic polyester readily to undergo melt processing can be attributed to its atypical inherent propensity to form a thermotropic melt phase at relatively low temperatures. The wholly aromatic polyester may be formed by a variety of procedures including a slurry polymerization technique (as defined) or a melt polymerization technique. The presence of the meta-oxybenzoyl moiety in the wholly aromatic polyester (as described) has been found to render the polymer melt processable at even lower temperatures than if this component were omitted.
Inventors
- 👤 Gordon W. Calundann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:28
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; D; D01; D01F; D01F6/00; D01F6/78; D01F6/84
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 310° C., consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR11## and IV is a symmetrical dioxy aryl moiety of the formula --O--Ar--O-- where Ar is a divalent radical comprising at least one aromatic ring, wherein said polyester comprises approximately 30 to 70 mole percent of moiety I and approximately 3 to 10 mole percent of moiety II.
Claim 2
Dependent Claim
80 words
A melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 310° C., consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR11## and IV is a symmetrical dioxy aryl moiety of the formula --O--Ar--O-- where Ar is a divalent radical comprising at least one aromatic ring, wherein said polyester comprises approximately 30 to 70 mole percent of moiety I and approximately 3 to 10 mole percent of moiety II.
Claim 3
Dependent Claim
23 words
A melt processable wholly aromatic polyester according to claim 1 which is capable of forming a thermotropic melt phase below approximately 300° C.
Claim 4
Dependent Claim
30 words
A melt processable wholly aromatic polyester according to claim 1 wherein said symmetrical dioxy arly moiety IV is selected from the group consisting of: ##STR12## and mixtures of the foregoing.
Claim 5
Dependent Claim
19 words
A melt processible wholly aromatic polyester according to claim 1 wherein said symmetrical dioxy aryl moiety IV is: ##STR13##
Claim 6
Dependent Claim
21 words
A melt processable wholly aromatic polyester according to claim 1 wherein the molar quantities of III and IV are substantially equal.
Claim 7
Dependent Claim
49 words
A melt processable wholly aromatic polyester according to claim 1 which comprises approximately 30 to 70 mole percent of moiety I, approximately 3 to 10 mole percent of moiety II, approximately 10 to 32.5 mole percent of moiety III, and approximately 10 to 32.5 mole percent of moiety IV.
Claim 8
Dependent Claim
49 words
A melt processable wholly aromatic polyester according to claim 1 which comprises approximately 60 to 70 mole percent of moiety I, approximately 3 to 10 mole percent of moiety II, approximately 10 to 18.5 mole percent of moiety III, and approximately 10 to 18.5 mole percent of moiety IV.
Claim 9
Dependent Claim
13 words
A molded article comprising the melt processable wholly aromatic polyester of claim 1.
Claim 10
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 11
Dependent Claim
15 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 1.
Claim 12
Dependent Claim
74 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 310° C. consisting of the recurring moieties I, II, III, and IV wherein: ##STR14## wherein the polyester comprises approximately 30 to 70 mole percent of moiety I, approximately 3 to 10 mole percent of moiety II, approximately 10 to 32.5 mole percent of moiety III, and approximately 10 to 32.5 mole percent of moiety IV.
Claim 13
Dependent Claim
74 words
An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 310° C. consisting of the recurring moieties I, II, III, and IV wherein: ##STR14## wherein the polyester comprises approximately 30 to 70 mole percent of moiety I, approximately 3 to 10 mole percent of moiety II, approximately 10 to 32.5 mole percent of moiety III, and approximately 10 to 32.5 mole percent of moiety IV.
Claim 14
Dependent Claim
23 words
A melt processable wholly aromatic polyester according to claim 11 which is capable of forming a thermotropic melt phase below approximately 300° C.
Claim 15
Dependent Claim
22 words
A melt processable wholly aromatic polyester according to claim 11 wherein the molar quantities of moieties III and IV are substantially equal.
Claim 16
Dependent Claim
49 words
A melt processable wholly aromatic polyester according to claim 11 which comprises approximately 60 to 70 mole percent of moiety I, approximately 3 to 10 mole percent of moiety II, approximately 10 to 18.5 mole percent of moiety III, and approximately 10 to 18.5 mole percent of moiety IV.
Claim 17
Dependent Claim
41 words
A melt processable wholly aromatic polyester according to claim 11 which comprises approximately 65 mole percent of moiety I, approximately 5 mole percent of moiety II, approximately 15 mole percent of moiety III, and approximately 15 mole percent of moiety IV.
Claim 18
Dependent Claim
13 words
A molded article comprising the melt processable wholly aromatic polyester of claim 11.
Claim 19
Dependent Claim
29 words
A molding compound comprising the melt processable wholly aromatic polyester of claim 11 which incorporates approximately 1 to 60 percent by weight of a solid filler and/or reinforcing agent.
Claim 20
Dependent Claim
15 words
A fiber which has been melt spun from the wholly aromatic polyester of claim 11.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |