Patent US4036803A successfully refreshed from Google Patents.
US4036803A
Expired / Lapsed
US
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Process for producing flame retardant acrylic synthetic fibers
Assignee: Japan Exlan Co Ltd
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Filing: 1975-11-11
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Granted: 1977-07-19
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Expires: 1995-11-11
Abstract
Abstract In a process for the production of flame retardant acrylic synthetic fibers by mixing a spinning solution of a acrylonitrile polymer with an emulsion of a polymer of a vinyl halide and/or vinylidene halide, and wet-spinning the resulting mixed solution, the improvement which comprises using, as said emulsion, an emulsion obtained by polymerizing a vinyl halide and/or vinylidene halide in an aqueous medium in the presence of certain water-soluble polymer.
Inventors
- 👤 Toshiyuki Kobashi
- 👤 Kenichi Masuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:15
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08L; C08L33/00; C08L33/18; C08L33/20; D; D01; D01F; D01F6/00; D01F6/44; D01F6/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
In a process for the production of a flame retardant acrylic synthetic fiber by mixing a spinning solution composed of an inorganic solvent solution of an acrylonitrile polymer with an emulsion of a polymer of a vinyl halide and/or vinylidene halide, and wet spinning the resulting mixed solution, the improvement which comprises using, as said emulsion, an emulsion obtained by polymerizing a vinyl halide and/or vinylidene halide, or a mixture of such monomers with other unsaturated monomers copolymerizable therewith, in an aqueous medium below a pH of 4 using a water-soluble cataylst, in the presence of a water-soluble polymer containing copolymerized monomer units consisting essentially of an ethylenically unsaturated carboxylic acid or a salt thereof and monomer units consisting of an ethylenically unsaturated sulfonic acid or a salt thereof, the ratio of monomeric units of ethylenically unsaturated carboxylic acid or its salt to monomeric units of ethylenically unsaturated sulfonic acid or its salt being 30-80:70- 20 in weight ratio.
Claim 2
Dependent Claim
159 words
In a process for the production of a flame retardant acrylic synthetic fiber by mixing a spinning solution composed of an inorganic solvent solution of an acrylonitrile polymer with an emulsion of a polymer of a vinyl halide and/or vinylidene halide, and wet spinning the resulting mixed solution, the improvement which comprises using, as said emulsion, an emulsion obtained by polymerizing a vinyl halide and/or vinylidene halide, or a mixture of such monomers with other unsaturated monomers copolymerizable therewith, in an aqueous medium below a pH of 4 using a water-soluble cataylst, in the presence of a water-soluble polymer containing copolymerized monomer units consisting essentially of an ethylenically unsaturated carboxylic acid or a salt thereof and monomer units consisting of an ethylenically unsaturated sulfonic acid or a salt thereof, the ratio of monomeric units of ethylenically unsaturated carboxylic acid or its salt to monomeric units of ethylenically unsaturated sulfonic acid or its salt being 30-80:70- 20 in weight ratio.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1 wherein the said water soluble polymer is present in the polymerization system in an amount of 0.5-10% by weight based on the monomer(s).
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1 wherein the said water soluble polymer is a copolymer of methacrylic acid and sodium p-styrenesulfonate.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1 wherein vinyl halide is vinyl chloride or vinyl bromide.
Claim 6
Dependent Claim
13 words
A process as claimed in claim 1 wherein vinylidene halide is vinylidene chloride.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 1 wherein there is used an emulsion containing 10 - 60% by weight of a polymer of vinyl halide and/or vinylidene halide.
Claim 8
Dependent Claim
46 words
A process as claimed in claim 1 wherein the polymer of vinyl halide and/or vinylidene halide is introduced into the spinning solution in an amount of 5 - 60% by weight based on total of said polymer of vinyl halide and/or vinylidene halide and acrylonitrile polymer.
Claim 9
Dependent Claim
19 words
A process as claimed in claim 1 wherein the acrylonitrile polymer contains at least 60% by weight of acrylonitrile.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 1 wherein the inorganic solvent is a concentrated aqueous solution of thiocyanate.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |