US4451423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of flame resistant moulded polymer articles
Assignee: Bayer AG
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Filing: 1982-09-23
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Granted: 1984-05-29
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Expires: 2002-09-23
Abstract
Abstract Flame resistant moulded halogen-containing polymer articles which contain antimony oxide are advantageously obtained by adding a soluble antimony compound which gives rise to an antimony oxide to the solution of halogen-containing polymer in an organic solvent, producing the moulded polymer article from the polymer solution and converting the antimony compound to antimony oxide in this article before or during the after-treatment.
Inventors
- 👤 Ulrich Reinehr
- 👤 Toni Herbertz
- 👤 Gunter Spilgies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:12
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/07; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/2279; D01F6/00; D01F6/44; D01F6/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A process for the production of polyacrylonitrile filaments which contain antimony trioxide comprising adding antimony halide to a solution of a halogen-containing acrylonitrile polymer in an organic solvent, said antimony halide added in a quantity of from 1 to 10% by weight, based on the polymer content, spinning the solution to form filaments and contacting said filaments with water.
Claim 2
Dependent Claim
59 words
A process for the production of polyacrylonitrile filaments which contain antimony trioxide comprising adding antimony halide to a solution of a halogen-containing acrylonitrile polymer in an organic solvent, said antimony halide added in a quantity of from 1 to 10% by weight, based on the polymer content, spinning the solution to form filaments and contacting said filaments with water.
Claim 3
Dependent Claim
31 words
A process according to claim 1, wherein the antimony halide is added to the polymer solution in a quantity of from 2 to 5% by weight, based on the polymer content.
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein the antimony halide is added in the form of a solution in an organic solvent.
Claim 5
Dependent Claim
12 words
A process according to claim 3, wherein the solvent is dimethyl formamide.
Claim 6
Dependent Claim
18 words
A process according to claim 1, wherein substances which are alkaline in reaction are added to the water.
Claim 7
Dependent Claim
29 words
A process according to claim 1, wherein said acrylonitrile polymer contains at least 40% by weight, of acrylonitrile units and at least 15% by weight, of vinylidene chloride units.
Claim 8
Dependent Claim
13 words
A process according to claim 1, wherein said antimony halide is antimony trichloride.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |