§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3984601A Expired / Lapsed US ⏱️ 0.0 years remaining

Acrylonitrile polymer filaments

Assignee: EIDP Inc
•
Filing: 1972-10-02
•
Granted: 1976-10-05
•
Expires: 1992-10-02
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Substantially single-phase compositions which are substantially partial or complete hydrates of an acrylonitrile polymer containing at least 40% acrylonitrile units can be shaped into filaments and films. The nitrile groups of the polymer are hydrated to a selected extent depending on the particular polymer used. Hydration occurs only within a certain elevated temperature range and under at least autogenous pressure. Also disclosed are films and filaments having novel structural features which are spun from the substantially single-phase compositions comprising polymers or copolymers of 80% or more acrylonitrile. The filaments are characterized by a sheath which has a density gradient in which the density increases toward the surface and, after drawing, by a unique luster source ratio related to reflective interfaces. Many of the filaments have surface striations and an optically microvoided core. The filaments contribute good hand and good water absorption properties to fabrics made therefrom.

Inventors

  • 👤 Robert Alan Blickenstaff

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 08:02
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/38; D01F6/02; D01F6/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2935; Y10T428/2964; Y10T428/2967; Y10T428/2973; Y10T428/2978

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 90 words
A synthetic polymer filament of at least 80% by weight units of acrylonitrile and up to about 20% by weight units of one or more copolymerizable addition monomers and characterized by a Luster Source Ratio of at least about 0.7 and a striated sheath having substantially no optical voids but having a positive density gradient to the surface of the filament, said sheath having a thickness of between about 5% and about 50% of the distance from the outer surface of the filament to the central axis of the filament.
Claim 2
Dependent Claim 90 words
A synthetic polymer filament of at least 80% by weight units of acrylonitrile and up to about 20% by weight units of one or more copolymerizable addition monomers and characterized by a Luster Source Ratio of at least about 0.7 and a striated sheath having substantially no optical voids but having a positive density gradient to the surface of the filament, said sheath having a thickness of between about 5% and about 50% of the distance from the outer surface of the filament to the central axis of the filament.
Claim 3
Dependent Claim 48 words
The filament of claim 1 wherein the outer surface of the sheath contains a number of generally longitudinal striations having a depth of between about 0.2 and 2.0 microns, a length of between about 15 and 500 microns and a striation count of between about 6 and 20.
Claim 4
Dependent Claim 34 words
The filament of claim 1 wherein the synthetic polymer employed contains at least 85% by weight units of acrylonitrile and up to about 15% by weight units of one or more copolymerizable addition monomers.
Claim 5
Dependent Claim 41 words
A filament of claim 3 wherein the polymer is a homopolymer of acrylonitrile or a copolymer of acrylonitrile, sodium styrenesulfonate, and either methyl acrylate, vinyl acetate or styrene in which the weight percent of acrylonitrile present is at least 90 percent.
Claim 6
Dependent Claim 24 words
The filament of claim 1 wherein the sheath surrounds a core which has substantially no voids having a diameter greater than about 0.05 micron.
Claim 7
Dependent Claim 48 words
The filament of claim 5 wherein the outer surface of the sheath contains a number of generally longitudinal striations having a depth of between about 0.2 and 2.0 microns, a length of between about 15 and 500 microns, and a striation count of between about 6 and 20.
Claim 8
Dependent Claim 34 words
The filament of claim 6 wherein the synthetic polymer employed contains at least 85% by weight units of acrylonitrile and up to about 15% by weight units of one or more copolymerizable addition monomers.
Claim 9
Dependent Claim 40 words
A filament of claim 7 wherein the polymer is a homopolymer of acrylonitrile or a copolymer of acrylonitrile, sodium styrenesulfonate, and either methyl acrylate, vinyl acetate, or styrene in which the weight percent of acrylonitrile is at least 90 percent.

References Cited (Backward Citations)

US2585444A Cited
US2764468A Cited
US3213071A Cited
US3080210A Cited
US3220902A Cited
US3377323A Cited
US3391051A Cited
US3447998A Cited
US3388202A Cited
US3655857A Cited
US3774387A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-10-05 1980-04-05 1980-10-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-10-05 1984-04-05 1984-10-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-10-05 1988-04-05 1988-10-05 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag