US3948840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous solvent for halogen-containing acrylonitrile polymer
Assignee: Wyeth Holdings LLC
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Filing: 1974-04-10
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Granted: 1976-04-06
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Expires: 1994-04-10
Abstract
Abstract Aqueous solutions containing at least 30% sodium thiocyanate and 2 to 25% dipropylene glycol are solvents for acrylonitrile polymers containing 55 to 80% acrylonitrile and 15 to 40% vinyl chloride, vinyl bromide, vinylidene chloride, vinylidene chlorobromide, and/or vinylidene bromide useful in forming solutions of 8 to 15% of such polymers for wet-spinning into fibers.
Inventors
- 👤 Jeno G. Szita
- 👤 Arutun Maranci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:30
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08K; C08K3/00; C08K3/30; C08K5/00; C08K5/04; C08K5/06; D; D01; D01D; D01D1/00; D01D1/02; D01F; D01F6/00; D01F6/28; D01F6/40; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
An aqueous solvent for acrylonitrile polymers containing 55 to 80% acrylonitrile and 15 to 40% halogencontaining comonomer comprising at least one of vinyl chloride, vinylidene chloride, vinylidene chlorobromide, vinyl bromide, and vinylidene bromide, said solvent comprising an aqueous solution of at least 30% on weight of solvent of sodium thiocyanate and 2% to 25% on weight of solvent of dipropylene glycol.
Claim 2
Dependent Claim
61 words
An aqueous solvent for acrylonitrile polymers containing 55 to 80% acrylonitrile and 15 to 40% halogencontaining comonomer comprising at least one of vinyl chloride, vinylidene chloride, vinylidene chlorobromide, vinyl bromide, and vinylidene bromide, said solvent comprising an aqueous solution of at least 30% on weight of solvent of sodium thiocyanate and 2% to 25% on weight of solvent of dipropylene glycol.
Claim 3
Dependent Claim
22 words
A composition as defined in claim 1 wherein the concentration of sodium thiocyanate is between 40 and 55% on weight of solvent.
Claim 4
Dependent Claim
69 words
An acrylonitrile polymer solution comprising 8 to 15% of acrylonitrile polymer containing 55 to 80% acrylonitrile and 15 to 40% of halogen-containing comonomer comprising at least one of vinyl chloride, vinylidene chloride, vinylidene chlorobromide, vinyl bromide, and vinylidene bromide dissolved in a solvent comprising an aqueous solution of at least 30% on weight of solvent of sodium thiocyanate and 2 to 25% on weight of solvent of dipropylene glycol.
Claim 5
Dependent Claim
69 words
An acrylonitrile polymer solution comprising 8 to 15% of acrylonitrile polymer containing 55 to 80% acrylonitrile and 15 to 40% of halogen-containing comonomer comprising at least one of vinyl chloride, vinylidene chloride, vinylidene chlorobromide, vinyl bromide, and vinylidene bromide dissolved in a solvent comprising an aqueous solution of at least 30% on weight of solvent of sodium thiocyanate and 2 to 25% on weight of solvent of dipropylene glycol.
Claim 6
Dependent Claim
22 words
A composition as defined in claim 3 wherein the concentration of sodium thiocyanate is between 40 and 55% on weight of solvent.
Claim 7
Dependent Claim
16 words
A process for forming fibers comprising wet-spinning an acrylonitrile polymer solution as defined in claim 3.
Claim 8
Dependent Claim
32 words
A process as defined in claim 5 wherein said polymer solution contains 10 to 13% acrylonitrile polymer and the concentration of sodium thiocyanate is between 40 and 55% on weight of solvent.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |