Patent US4263180A successfully refreshed from Google Patents.
US4263180A
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Method for occluding sequestering agents in filamentary structure, occluded sequestering agents thus obtained and their applications
Assignee: Anic SpA
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Filing: 1976-06-04
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Granted: 1981-04-21
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Expires: 1996-06-04
Abstract
Abstract A method is disclosed for embedding sequestering agents in filamentary structures, the method comprising the steps of preparing an emulsion formed by an aqueous or nearly aqueous solution of the sequestering agent and a solution of the filament-forming polymer in an appropriate solvent, and spinning the emulsion in a coagulation bath.
Inventors
- 👤 Walter Marconi
- 👤 Francesco Bartoli
- 👤 Silvio Gulinelli
- 👤 Franco Morisi
- 👤 Delio Zaccardelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:56
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; B; B01; B01J; B01J47/00; B01J47/12; B01J47/127
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A method for preparing a sequestering structure in filamentary form consisting essentially of the steps of: (a) dissolving a filament-forming polymer selected from the group consisting of cellulose polymers, polyamides, acrylonitrile polymers and copolymers, butadiene and isoprene copolymers, acrylate polymers and copolymers, methacrylate polymers and copolymers, vinyl ester polymers and copolymers, vinyl chloride polymers and copolymers, vinylidene chloride polymers and copolymers, styrene polymers and copolymers, vinyl butyrate polymers and copolymers, and gamma-methyl glutamate polymers and copolymers in a solvent which is immiscible with water and mixtures of water and glycerol; (b) dissolving the sequestering agent consisting of dextran, acrylimide-acrylic acid copolymers, carboxy methyl cellulose, p-amino benzyl cellulose, polyethyleneimine hydrochloride, albumin, poly-L-lysine hydrobromide and polyacrylic acid which is chemically non-reactive with the filament-forming polymer in a solvent selected from the group consisting of water or mixtures of water and glycerol to form a disperse solution; (c) adding the disperse solution containing the sequestering agent to the solution containing the filament-forming polymer; (d) stirring the disperse solution containing the sequestering agent and the solution containing the filament-forming polymer until a homogeneous emulsion is obtained; (e) spinning the homogeneous emulsion through a spinneret submerged in a coagulation bath; (f) collecting the polymer fibers having sequestering agents occluded therein; and (g) removing the coagulation liquor and the polymer solvent from the fiber.
Claim 2
Independent Claim
218 words
A method for preparing a sequestering structure in filamentary form consisting essentially of the steps of: (a) dissolving a filament-forming polymer selected from the group consisting of cellulose polymers, polyamides, acrylonitrile polymers and copolymers, butadiene and isoprene copolymers, acrylate polymers and copolymers, methacrylate polymers and copolymers, vinyl ester polymers and copolymers, vinyl chloride polymers and copolymers, vinylidene chloride polymers and copolymers, styrene polymers and copolymers, vinyl butyrate polymers and copolymers, and gamma-methyl glutamate polymers and copolymers in a solvent which is immiscible with water and mixtures of water and glycerol; (b) dissolving the sequestering agent consisting of dextran, acrylimide-acrylic acid copolymers, carboxy methyl cellulose, p-amino benzyl cellulose, polyethyleneimine hydrochloride, albumin, poly-L-lysine hydrobromide and polyacrylic acid which is chemically non-reactive with the filament-forming polymer in a solvent selected from the group consisting of water or mixtures of water and glycerol to form a disperse solution; (c) adding the disperse solution containing the sequestering agent to the solution containing the filament-forming polymer; (d) stirring the disperse solution containing the sequestering agent and the solution containing the filament-forming polymer until a homogeneous emulsion is obtained; (e) spinning the homogeneous emulsion through a spinneret submerged in a coagulation bath; (f) collecting the polymer fibers having sequestering agents occluded therein; and (g) removing the coagulation liquor and the polymer solvent from the fiber.
Claim 3
Dependent Claim
34 words
The method as set forth in claim 1 wherein the filament-forming polymer is cellulose triacetate and the sequestering agent is selected from the group consisting of polyethyleneimine hydrochloride, albumin, poly-L-lysine hydrobromide and polyacrylic acid.
Claim 4
Dependent Claim
169 words
A sequestering structure in filamentary form having occluded therein a sequestering agent selected from the group consisting of dextran, acrylimide-acrylic acid copolymers, carboxy methyl cellulose, p.amino benzyl cellulose, polyethyleneimine hydrochloride, albumin, poly-L-lysine hydrobromide and polyacrylic acid prepared by the method consisting essentially of: (a) dissolving a filament-formng polymer in a solvent which is immiscible with water and mixtures of water and glycerol; (b) dissolving the sequestering agent which is chemically non-reactive with the filament-forming polymer in a solvent from the group consisting of water or mixtures of water and glycerol to form a disperse solution; (c) adding the disperse solution containing the sequestering agent to the solution containing the filament-forming polymer; (d) stirring the disperse solution containing the sequestering agent and the solution containing the filament-forming polymer until a homogeneous emulsion is obtained; (e) spinning the homogeneous emulsion through a spinneret submerged in a coagulation bath; (f) collecting the polymer fibers having sequestering agents occluded therein; and (g) removing the coagulation liquor and the polymer solvent from the fiber.
Claim 5
Dependent Claim
169 words
A sequestering structure in filamentary form having occluded therein a sequestering agent selected from the group consisting of dextran, acrylimide-acrylic acid copolymers, carboxy methyl cellulose, p.amino benzyl cellulose, polyethyleneimine hydrochloride, albumin, poly-L-lysine hydrobromide and polyacrylic acid prepared by the method consisting essentially of: (a) dissolving a filament-formng polymer in a solvent which is immiscible with water and mixtures of water and glycerol; (b) dissolving the sequestering agent which is chemically non-reactive with the filament-forming polymer in a solvent from the group consisting of water or mixtures of water and glycerol to form a disperse solution; (c) adding the disperse solution containing the sequestering agent to the solution containing the filament-forming polymer; (d) stirring the disperse solution containing the sequestering agent and the solution containing the filament-forming polymer until a homogeneous emulsion is obtained; (e) spinning the homogeneous emulsion through a spinneret submerged in a coagulation bath; (f) collecting the polymer fibers having sequestering agents occluded therein; and (g) removing the coagulation liquor and the polymer solvent from the fiber.
Claim 6
Dependent Claim
68 words
A structure as claimed in claim 3 wherein the fiber forming polymer is selected from the group consisting of cellulose polymers, polyamides, acrylonitrile polymers and copolymers, butadiene and isoprene copolymers, acrylate polymers and copolymers, methacrylate polymers and copolymers, vinyl ester polymers and copolymers, vinyl chloride polymers and copolymers, vinylidene chloride polymers and copolymers, styrene polymers and copolymers, vinyl butyrate polymers and copolymers, and gamma-methyl glutamate polymers and copolymers.
Claim 7
Dependent Claim
33 words
A structure as claimed in claim 4 wherein said filament-forming polymer is cellulose triacetate and said sequestering agent is selected from the group consisting of polyethyleneimine hydrochloride, albumin, poly-L-lysine hydrobromide and polyacrylic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |