US4533724A
Expired / Lapsed
US
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Liquid crystalline poly (2,6-benzothiazole) compositions, process, and products
Assignee: Toyobo Co Ltd
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Filing: 1982-09-17
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Granted: 1985-08-06
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Expires: 2002-09-17
Abstract
Abstract PCT No. PCT/US82/01286 Sec. 371 Date Sep. 17, 1982 Sec. 102(e) Date Sep. 17, 1982 PCT Filed Sep. 17, 1982 PCT Pub. No. WO84/01161 PCT Pub. Date Mar. 29, 1984.Novel compositions comprising a high concentration of poly(2,6-benzothiazole) and certain polyphosphoric acids are prepared. Such compositions are optically anisotropic (liquid crystalline), capable of exhibiting excellent cohesive strength, and are especially suited to the production of high molecular weight ordered polymer fibers by dry-jet wet spinning. These liquid crystalline compositions are capable of being drawn through long air gap distances and spun at exceptionally high spin draw ratios. Fibers, films and other articles formed from these liquid crystalline compositions exhibit exceptionally high physical and heat resistant properties.
Inventors
- 👤 James F. Wolfe
- 👤 Paul D. Sybert
- 👤 Joanne R. Sybert
- 👤 Blake Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C08; C08G; C08G73/00; C08G73/06; C08G73/18; C08G75/00; C08G75/32; D; D01; D01F; D01F6/00; D01F6/58; D01F6/74
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
162 words
A process for preparing an extended chain polymer composition of workable viscosity which is useful as a dope in the production of fibers and films, said composition comprising liquid crystalline poly(2,6-benzothiazole), said process comprises the following steps: (a) mixing a selected monomer with or without oxidation protecting atoms or groups with a preliminary solvent of phosphoric acid having a relatively low phosphorus pentoxide content, (b) heating and optionally placing the resulting mixture under reduced pressure to remove any volatilized protecting atoms or groups present and provide a solution of the monomer in the preliminary solvent, (c) then increasing the phosphorus pentoxide content of the mixture resulting from step (b) by adding phosphorus pentoxide in two or more portions to provide a monomer reaction medium of greater phosphorus pentoxide content suitable for polymerization, (d) causing polymerization of the monomer at a temperature sufficient to effect reaction at a rate to form a homo-oligomeric product having a preselected intrinsic viscosity or a homopolymeric product.
Claim 2
Dependent Claim
162 words
A process for preparing an extended chain polymer composition of workable viscosity which is useful as a dope in the production of fibers and films, said composition comprising liquid crystalline poly(2,6-benzothiazole), said process comprises the following steps: (a) mixing a selected monomer with or without oxidation protecting atoms or groups with a preliminary solvent of phosphoric acid having a relatively low phosphorus pentoxide content, (b) heating and optionally placing the resulting mixture under reduced pressure to remove any volatilized protecting atoms or groups present and provide a solution of the monomer in the preliminary solvent, (c) then increasing the phosphorus pentoxide content of the mixture resulting from step (b) by adding phosphorus pentoxide in two or more portions to provide a monomer reaction medium of greater phosphorus pentoxide content suitable for polymerization, (d) causing polymerization of the monomer at a temperature sufficient to effect reaction at a rate to form a homo-oligomeric product having a preselected intrinsic viscosity or a homopolymeric product.
Claim 3
Dependent Claim
114 words
A process for preparing an extended chain polymer composition of workable viscosity which is useful as a dope in the production of fibers and films, said composition comprising a liquid crystalline poly(2,6-benzothiazole), and said process comprises: (a) incorporating a selected monomer in a preliminary solvent of phosphoric acid having a relatively low phosphorus pentoxide content, (b) increasing the phosphorus pentoxide content of the resultant preliminary solvent by adding phosphorus pentoxide in two or more portions to provide a monomer reaction medium of greater phosphorus pentoxide content suitable for polymerization, (c) causing polymerization of the monomer at a temperature sufficient to effect reaction at a rate to form a polymer having a preselected intrinsic viscosity.
Claim 4
Dependent Claim
114 words
A process for preparing an extended chain polymer composition of workable viscosity which is useful as a dope in the production of fibers and films, said composition comprising a liquid crystalline poly(2,6-benzothiazole), and said process comprises: (a) incorporating a selected monomer in a preliminary solvent of phosphoric acid having a relatively low phosphorus pentoxide content, (b) increasing the phosphorus pentoxide content of the resultant preliminary solvent by adding phosphorus pentoxide in two or more portions to provide a monomer reaction medium of greater phosphorus pentoxide content suitable for polymerization, (c) causing polymerization of the monomer at a temperature sufficient to effect reaction at a rate to form a polymer having a preselected intrinsic viscosity.
Claim 5
Dependent Claim
16 words
A process according to claim 1, or 2 wherein said selected monomer is 3-mercapto-4-aminobenzoic acid hydrochloride.
Claim 6
Dependent Claim
15 words
A process according to claim 1, or 2 wherein said selected monomer is 3-mercapto-4-aminobenzoic acid.
Claim 7
Dependent Claim
30 words
A process according to claim 1, or 2 wherein said phosphorus pentoxide content of step (a) is present in said preliminary solvent in an amount below about 77% by weight.
Claim 8
Dependent Claim
48 words
A process according to claim 5 wherein said phosphorus pentoxide content of said monomer reaction medium of step (c) is of an amount suitable for polymerization to provide a homopolymeric product of said polymerization reaction having a phosphorus pentoxide content between about 82% and about 86% by weight.
Claim 9
Dependent Claim
31 words
A process according to claim 6 wherein said phosphorus pentoxide content of step (d) is present in said homopolymeric product in an amount between about 82% and about 84% by weight.
Claim 10
Dependent Claim
39 words
A process according to claim 7 further comprising the step of spinning said homo-oligomeric product or said homopolymeric product through an air-gap and into a coagulation bath thereby forming a fiber, said spinning being performed at high draw ratios.
Claim 11
Dependent Claim
40 words
A process according to claim 7 further comprising the step of spinning said homo-oligomeric product or said homopolymeric product through an air-gap of from about 1 cm to about 200 cm before entering a coagulation bath thereby forming a fiber.
Claim 12
Dependent Claim
44 words
A process according to claim 6 wherein said phosphorus pentoxide content of step (c) is increased by adding phosphorus pentoxide in two or more portions to provide said monomer reaction medium of greater phosphorus pentoxide content between about 82% and about 84% by weight.
Claim 13
Dependent Claim
31 words
A process according to claim 6 wherein said phosphorus pentoxide content of step (d) is present in said homo-oligomeric product in an amount between about 82% and about 84% by weight.
Claim 14
Dependent Claim
42 words
A process according to claim 7 further comprising the step of drawing said first homo-oligomeric product or said first homopolymeric product and passing said product through a coagulation bath so as to extract substantially all the phosphoric acid thereby forming an article.
Claim 15
Dependent Claim
40 words
A process according to claim 7 further comprising the step of drawing said homo-oligomeric product or said homopolymeric product and passing said product through a coagulation bath so as to extract substantially all the phosphoric acid thereby forming an article.
Claim 16
Dependent Claim
40 words
A process according to claim 7 further comprising the step of extruding said homo-oligomeric product or said homopolymeric product and passing said product through a coagulation bath so as to extract substantially all the phosphoric acid thereby forming a film
Claim 17
Dependent Claim
40 words
A process according to claim 7 further comprising the step of casting said homo-oligomeric product or said homopolymeric product and passing said product through a coagulation bath so as to extract substantially all the phosphoric acid thereby forming an article.
Claim 18
Dependent Claim
26 words
A process according to claim 2 wherein said phosphorus pentoxide content following polymerization is present in an amount between about 82% and about 84% by weight.
Claim 19
Dependent Claim
32 words
A process according to claim 2 wherein said phosphorus pentoxide content of step (b) is present in said monomer reaction medium in an amount between about 82% and about 86% by weight.
Claim 20
Dependent Claim
34 words
A process according to claim 1 or 2 wherein said polymer is ##STR827## wherein n corresponds to a molecular weight of at least about 7 dL/g as determined in methanesulfonic acid at 30° C.
Claim 21
Dependent Claim
12 words
A process according to claim 18 wherein said polymer is crystalline poly(2,6-benzothiazole).
References Cited (Backward Citations)
US2904537A
Cited
US3424720A
Cited
US3642696A
Cited
US3661849A
Cited
US3286992A
Cited
US3644288A
Cited
US3632414A
Cited
US3620999A
Cited
US3873497A
Cited
US3681297A
Cited
US3691136A
Cited
US3800985A
Cited
US3864310A
Cited
US3804791A
Cited
US3836500A
Cited
US4233434A
Cited
US4051108A
Cited
US4054633A
Cited
JPS53128350A
Cited
US4108835A
Cited
US4131748A
Cited
JPS54101337A
Cited
JPS54101339A
Cited
JPS54119941A
Cited
JPS54128357A
Cited
JPS54133358A
Cited
JPS54133360A
Cited
JPS54133361A
Cited
JPS54133359A
Cited
US4207407A
Cited
US4225700A
Cited
US4263245A
Cited
JPS569722A
Cited
US4229566A
Cited
US4312976A
Cited
US4342862A
Cited
US4351917A
Cited
US4351918A
Cited
US4355132A
Cited
US4377546A
Cited
US4359567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |