US4060968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester fibers having wool-like hand and process for producing same
Assignee: Rhone Poulenc Textile SA
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Filing: 1974-08-05
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Granted: 1977-12-06
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Expires: 1994-08-05
Abstract
Abstract Bicomponent polyester fibers exhibiting a hand similar to wool, a crimp contraction less than 60%, and a crimp frequency of at least 7 half-waves per centimeter, and the process for producing the same, are disclosed. These crimped bicomponent fibers are useful in the textile field, particularly to at least partially replace the wool in polyester/wool blends.
Inventors
- 👤 Gerard Barbe
- 👤 Andre Deyres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:02
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/14; Y; Y10; Y10S; Y10S57/00; Y10S57/905; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
Crimped bicomponent polyester staple fibers having a hand similar to wool, good processability as staple fibers, a crimp contraction less than 60%, and at least 7 crimp half waves/cm, said fibers of 50 to 80% by weight of one component which comprises crosslinked polyethylene terephthalate having about 0.20 to 0.70 mole percent of crosslinking agent, based on the moles of terephthalate units, and having an intrinsic viscosity of about 0.45 to 0.60, and 50 to 20% by weight of the second component which comprises a sparingly crosslinked polybutylene terephthalate having about 0.20 to about 0.60 mole percent of cross-linking agent and having a viscosity in the molten state at 260°C. less than 4,000 poises.
Claim 2
Dependent Claim
114 words
Crimped bicomponent polyester staple fibers having a hand similar to wool, good processability as staple fibers, a crimp contraction less than 60%, and at least 7 crimp half waves/cm, said fibers of 50 to 80% by weight of one component which comprises crosslinked polyethylene terephthalate having about 0.20 to 0.70 mole percent of crosslinking agent, based on the moles of terephthalate units, and having an intrinsic viscosity of about 0.45 to 0.60, and 50 to 20% by weight of the second component which comprises a sparingly crosslinked polybutylene terephthalate having about 0.20 to about 0.60 mole percent of cross-linking agent and having a viscosity in the molten state at 260°C. less than 4,000 poises.
Claim 3
Dependent Claim
14 words
Fibers of claim 1, wherein said fibers have a crimp contraction less than 40%.
Claim 4
Dependent Claim
16 words
Fibers of claim 1, wherein said fibers have from 7 to about 10 crimp half waves/cm.
Claim 5
Dependent Claim
29 words
Fibers of claim 3, wherein the polyethylene terephthalate contains from 0.20 to 0.70 mol % of a trifunctional or tetrafunctional cross-linking agent, based on the mols of terephthalate units.
Claim 6
Dependent Claim
31 words
Fibers of claim 3, wherein the polybutylene terephthalate is sparingly crosslinked by 0.20 to 0.60 mol % of a trifunctional or tetrafunctional ester-forming cross-linking agent, based on moles of terephthalate units.
Claim 7
Dependent Claim
16 words
Fibers of claim 3, wherein the crosslinked polyethylene terephthalate has an intrinsic viscosity of about 0.55.
Claim 8
Dependent Claim
17 words
Fibers according to claim 3, wherein the cross-linked polyethylene terephthalate has an intrinsic viscosity of about 0.50.
Claim 9
Dependent Claim
118 words
Spun yarn containing crimped bicomponent polyester staple fibers having a hand similar to wool, good processability as staple fibers, a crimp contraction less than 60%, and at least 7 crimp half waves/cm, said fibers of 50 to 80% by weight of one component which comprises crosslinked polyethylene terephthalate having about 0.20 to 0.70 mole per cent of crosslinking agent, based on the moles of terephthalate units, and having an intrinsic viscosity of about 0.45 to 0.60, and 50 to 20% by weight of the second component which comprises a sparingly crosslinked polybutylene terephthalate having about 0.20 to about 0.60 mole percent of cross-linking agent and having a viscosity in the molten state at 260°C. less than 4,000 poises.
Claim 10
Dependent Claim
118 words
Spun yarn containing crimped bicomponent polyester staple fibers having a hand similar to wool, good processability as staple fibers, a crimp contraction less than 60%, and at least 7 crimp half waves/cm, said fibers of 50 to 80% by weight of one component which comprises crosslinked polyethylene terephthalate having about 0.20 to 0.70 mole per cent of crosslinking agent, based on the moles of terephthalate units, and having an intrinsic viscosity of about 0.45 to 0.60, and 50 to 20% by weight of the second component which comprises a sparingly crosslinked polybutylene terephthalate having about 0.20 to about 0.60 mole percent of cross-linking agent and having a viscosity in the molten state at 260°C. less than 4,000 poises.
Claim 11
Dependent Claim
15 words
Spun yarn of claim 8 wherein the yarn contains a low content of wool fibers.
Claim 12
Dependent Claim
13 words
Knit or woven textile articles made of the spun yarn of claim 8.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |