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US4606875A
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Process for preparing shaped articles of rigid rod heterocyclic liquid crystalline polymers
Assignee: Invista North America LLC
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Filing: 1983-04-11
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Granted: 1986-08-19
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Expires: 2003-04-11
Abstract
Abstract Shaped articles are prepared from rigid rod heterocyclic liquid crystalline polymers. The articles are prepared by polymerizing the polymer in a reaction medium whereby a solution of the polymer is formed and by forming the articles directly from the polymer solution.
Inventors
- 👤 Edward C. Chenevey
- 👤 Thaddeus E. Helminiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:38
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/74; D01D; D01D5/00; D01D5/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
93 words
A process for preparing shaped articles of a rigid rod heterocyclic liquid crystalline polymer comprising: (a) forming a reaction mixture comprising reactants for the formation of a polymer selected from the group consisting of poly [benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl]-1,4-phenylene, its cis isomer, poly(p-phenylene benzobisimidazole), poly(p-phenylene benzobisoxazole), its trans isomer and mixtures thereof and a reaction medium selected from the group consisting of polyphosphoric acid, dehydrating phosphate acids, and mixtures thereof; (b) polymerizing the reactants in the reaction mixture whereby a solution of said polymer is formed; and (c) forming shaped articles directly from the polymer solution.
Claim 2
Dependent Claim
93 words
A process for preparing shaped articles of a rigid rod heterocyclic liquid crystalline polymer comprising: (a) forming a reaction mixture comprising reactants for the formation of a polymer selected from the group consisting of poly [benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl]-1,4-phenylene, its cis isomer, poly(p-phenylene benzobisimidazole), poly(p-phenylene benzobisoxazole), its trans isomer and mixtures thereof and a reaction medium selected from the group consisting of polyphosphoric acid, dehydrating phosphate acids, and mixtures thereof; (b) polymerizing the reactants in the reaction mixture whereby a solution of said polymer is formed; and (c) forming shaped articles directly from the polymer solution.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the reactants comprise from about 3 to about 20% by weight of the reaction mixture.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein polymerizing the reactants is performed at a temperature in the range of from about 150° to about 220° C. and at approximately atmospheric pressure.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein polymerizing the reactants is performed in a substantially inert atmosphere.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the atmosphere is composed of nitrogen.
Claim 7
Dependent Claim
41 words
The process of claim 1 wherein the polymer comprises from about 5 to about 18% by weight of the solution and the article is formed by wet spinning into a coagulation bath or dry jet wet spinning into a coagulation bath.
Claim 8
Dependent Claim
24 words
The process of claim 6 wherein the coagulation bath is selected from the group consisting of water, aqueous phosphoric acid, methanol, and mixtures thereof.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein the shaped article is selected from the group consisting of fibers, filaments, yarns and films.
Claim 10
Dependent Claim
49 words
The process of claim 1 wherein the reaction medium is comprised of polyphosphoric acid and wherein polymerizing the reactants is performed at a temperature in the range of from about 170° to about 200° C. and a pressure in the range of from about 720 to about 800 mm.Hg.
Claim 11
Dependent Claim
16 words
The process of claim 9 wherein polymerizing the reactants is performed in a substantially inert atmosphere.
Claim 12
Dependent Claim
17 words
The process of claim 10 wherein the polymer is poly [benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl]-1,4-phenylene, its cis isomer or mixtures thereof.
Claim 13
Dependent Claim
19 words
The process of claim 1 wherein the polymer has an intrinsic viscosity between about 10 and about 30 dl./g.
Claim 14
Dependent Claim
19 words
The process of claim 12 wherein the polymer has an intrinsic viscosity between about 20 and about 30 dl./g.
Claim 15
Dependent Claim
23 words
The process of claim 1 wherein the shaped article has a tenacity in the range of from about 3 to about 20 g./den.
Claim 16
Dependent Claim
20 words
The process of claim 1 wherein the shaped article has a modulus of from about 300 to about 1500 g./den.
References Cited (Backward Citations)
US3313783A
Cited
US3574170A
Cited
US4051108A
Cited
US4054633A
Cited
US4148774A
Cited
US4225700A
Cited
US4423202A
Cited
US4377546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |