US3642565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite filaments having an elastic crimping property
Assignee: SNIA Viscosa SpA
•
Filing: 1969-03-17
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Granted: 1972-02-15
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Expires: 1989-03-17
Abstract
Abstract Composite filament having an elastic crimping property, comprised of at least two components disposed in an eccentric sheath-core relation along the longitudinal axis of the filament, in which one component is composed of a polyester consisting mainly of polyethylene terephthalate and another component or components comprise highly shrinkable polyamide having a shrinking percentage of 15-80 percent and the percent by weight of the core or cores in the filament is 5-50. It is preferable that the core component is composed of the polyester and the sheath component is composed of the polyamide. Furthermore, the eccentricity of the sheath-core relation is preferably at least 5. The core component may be constituted with a plurality number of cores.
Inventors
- 👤 Fumimaro Ogata
- 👤 Tsutomu Naruse
- 👤 Torazo Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2973
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
17 words
The composite filament as claimed in claim 1, wherein said shrinking percentage is at least 20 percent.
Claim 2
Dependent Claim
24 words
The composite filament as claimed in claim 1, wherein said percent by weight of the core or cores in the filament is 20 *40.
Claim 3
Dependent Claim
14 words
The composite filament as claimed in claim 1 which has at least two cores.
Claim 4
Dependent Claim
22 words
The composite filament as claimed in claim 1, wherein said polyamide is a homopolyamide having an intrinsic viscosity of at least 1.15.
Claim 5
Dependent Claim
15 words
The composite filament as claimed in claim 1, wherein said homopolyamide is nylon-6 or nylon-66.
Claim 6
Dependent Claim
45 words
The composite filament as claimed in claim 1, wherein said polyamide is a copolyamide of more than 95 percent by weight of a polyamide-forming constituent and less than 5 percent by weight of another polyamide-forming constituent and having an intrinsic viscosity of at least 1.15.
Claim 7
Dependent Claim
34 words
The composite filament as claimed in claim 1, wherein said polyamide is a copolyamide of 95 *70 percent by weight of a polyamide-forming constituent and 5 *30 percent by weight of another polyamide-forming constituent.
Claim 8
Dependent Claim
21 words
The composite filament as claimed in claim 1, wherein said polyamide is of poly(caproamide/hexamethylene adipamide), poly(caproamide/hexamethylene isophthalamide) or poly(hexamethylene adipamide/hexamethylene sebacamide).
Claim 9
Dependent Claim
72 words
The composite filament as claimed in claim 1, wherein the sheath is constituted with two polyamide components disposed eccentrically to each other in distinct zone with intimate adherent surface extending along the filament axis, one of said components consists of a homopolyamide, the other of said components consists of a copolyamide and further the core composed of said polyester component is embedded in said homopolyamide component without contacting with said copolyamide component.
Claim 10
Dependent Claim
84 words
The composite filament as claimed in claim 10, wherein the core and the copolyamide component of the sheath are arranged under such a condition that the lesser angle Alpha formed by two straight lines, one of which connects the center of gravity of said core with the center of the filament and the other of which connects the center of gravity of said copolyamide component with the center of filament, in the cross section of the filament, is the range between 90* and 180*.
Claim 11
Dependent Claim
28 words
The composite filament as claimed in claim 10, wherein the shrinking percentage of the copolyamide component is at least 3 percent higher than that of the homopolyamide component.
Claim 12
Dependent Claim
34 words
The composite filament as claimed in claim 10, wherein said copolyamide consists of less than 95 percent by weight of a polyamide-forming constituent and more than 5 percent by weight of another polyamide-forming constituent.
Claim 13
Dependent Claim
17 words
The composite filament as claimed in claim 10, wherein said homopolyamide component is of nylon-6 or nylon-66.
Claim 14
Dependent Claim
22 words
The composite filament as claimed in claim 10, wherein said copolyamide component is of poly(caproamide/hexamethylene adipamide), poly(caproamide/hexamethylene isophthalamide) or poly(hexamethylene adipamide/hexamethylene sebacamide).
Claim 15
Dependent Claim
20 words
The composite filament as claimed in claim 10, wherein said homopolyamide and said copolyamide are arranged in a side-by-side relation.
Claim 16
Dependent Claim
21 words
The composite filament as claimed in claim 10, wherein said homopolyamide and said copolyamide are arranged in an eccentric sheath-core relation.
Claim 17
Dependent Claim
19 words
The composite filament of claim 1, wherein polyethylene terephthalate comprises at least 95 percent of said first component (a).
References Cited (Backward Citations)
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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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |