US3963790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-inflammable filaments comprising acrylonitrile/vinylidene chloride copolymers
Assignee: Rhone Poulenc Textile SA
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Filing: 1974-09-03
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Granted: 1976-06-15
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Expires: 1994-09-03
Abstract
Abstract Non-inflammable filaments having good physical characteristics are disclosed, wherein the filaments have a chlorine content of 25-40% by weight and a sticking temperature of at least 215°C, and a shrinkage of less than 32% when subjected to steam at 130°C in the free or unrestrained state. The filaments are formed by spinning a mixture of incompatible polymers, one polymer, used in an amount of 50-99% by weight, containing 79.5 to 58 weight percent of acrylonitrile units, 20-40 weight percent of vinylidene chloride units and 0.5 to 2 weight percent of a comonomer which enhances dyeability, and the other copolymer, used in an amount of from 1-50 weight percent, containing from 20-50 percent by weight of acrylonitrile units and 50-80 percent of vinylidene chloride units. The filaments may be used in textile applications, such as for clothing, furniture upholstery, and the like.
Inventors
- 👤 Paul Couchoud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:23
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/44; D01F6/54; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
Non-inflammable filaments of at least two incompatible copolymers of acrylonitrile and vinylidene chloride, said filaments having: a. a sticking temperature of at least 215°C., b. a shrinkage of less than 32% when subjected to steam at 130°C. in the unrestrained state, c. two distinct phases, a continuous phase and a dispersed phase, the average size of the dispersed phase particles being less than 3 microns, d. the following composition: i. at least about 50 weight percent of the filament being a copolymer of about 79.5 to about 58 weight percent of acrylonitrile, 20 to about 40 weight percent of vinylidene chloride, and about 0.5 to about 2 weight percent of a comonomer which enhances dyeability, and ii. less than about 50 weight percent of a second copolymer of about 20 to about 50 weight percent of acrylonitrile and about 50 to about 80 weight percent of vinylidene chloride, e. and a chlorine content of 25 to about 40% by weight.
Claim 2
Dependent Claim
160 words
Non-inflammable filaments of at least two incompatible copolymers of acrylonitrile and vinylidene chloride, said filaments having: a. a sticking temperature of at least 215°C., b. a shrinkage of less than 32% when subjected to steam at 130°C. in the unrestrained state, c. two distinct phases, a continuous phase and a dispersed phase, the average size of the dispersed phase particles being less than 3 microns, d. the following composition: i. at least about 50 weight percent of the filament being a copolymer of about 79.5 to about 58 weight percent of acrylonitrile, 20 to about 40 weight percent of vinylidene chloride, and about 0.5 to about 2 weight percent of a comonomer which enhances dyeability, and ii. less than about 50 weight percent of a second copolymer of about 20 to about 50 weight percent of acrylonitrile and about 50 to about 80 weight percent of vinylidene chloride, e. and a chlorine content of 25 to about 40% by weight.
Claim 3
Dependent Claim
37 words
Filaments according to claim 1, wherein said filaments are based on a mixture of about 65 to about 75 percent by weight of said copolymer, and about 25 to about 35% by weight of said second copolymer.
Claim 4
Dependent Claim
16 words
Filaments according to claim 1, wherein the filaments have a sticking temperature of 215°C to 235°C.
Claim 5
Dependent Claim
26 words
Filaments according to claim 1, wherein the filaments have a shrinkage when treated with steam at 130°C in the free state of between 25 and 32%.
Claim 6
Dependent Claim
16 words
Filaments according to claim 1, wherein the filaments have a chlorine content of 29-36% by weight.
Claim 7
Dependent Claim
61 words
Filaments according to claim 1, wherein the filaments are obtained by spinning an incompatible mixture of the copolymer and the second copolymer in a common inert polar organic solvent, wherein the solution of the second copolymer forms a dispersed phase in the solution of the said copolymer, said dispersed phase having an average particle size, or droplet size, of 1-3 microns.
Claim 8
Dependent Claim
57 words
Filaments according to claim 1, wherein the said copolymer and said second copolymer are incompatible to the extent that when dissolved in a common solvent at a concentration of 18-25 weight percent, the solution of said second copolymer forms droplets having average particle sizes of about 1 - about 3 microns in the solution of said copolymer.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |