US3616183A
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Polyester sheath-core conjugate filaments
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-03-17
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Granted: 1971-10-26
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Expires: 1989-03-17
Abstract
Abstract Sheath/core conjugate filaments which combine the tensile properties of poly(ethylene terephthalate) as core with the surface properties of a copolyester of ethylene terephthalate/polyoxyethylene terephthalate as sheath.
Inventors
- 👤 John Raymond Brayford
- 👤 Michael Mundie Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:19
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/12; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/34; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
52 words
A sheath-core conjugate filament according to claim 1 wherein the proportion of the structural units of the copolyester of the core containing poly(alkylene oxide) radicals is such as would result from no more than 3 parts by weight of poly(alkylene oxide) per 100 parts by weight of the copolyester of the core.
Claim 2
Dependent Claim
31 words
A sheath-core conjugate filament according to claim 1 wherein the sheath component occupies no less than 5 percent and no more than 40 percent of the cross-sectional area of the filament.
Claim 3
Dependent Claim
30 words
A sheath-core conjugate filament according to claim 1 wherein the sheath component occupies no less than 7 and no more than 33 percent of the cross-sectional area of the filament.
Claim 4
Dependent Claim
33 words
A sheath-core conjugate filament according to claim 1 wherein the poly(alkylene oxide) of average molecular weight at least 500 is of average molecular weight not less than 1,000 and not greater than 20,000.
Claim 5
Dependent Claim
18 words
A sheath-core conjugate filament according to claim 5 wherein the average molecular weight is not greater than 6,000.
Claim 6
Dependent Claim
57 words
A sheath-core conjugate filament according to claim 1 wherein the proportion of the structural units of the copolyester or admixed copolyester of the sheath containing poly(alkylene oxide) radicals is such as would result from the reaction of not more than 40 parts of poly(alkylene oxide) per 100 parts by weight of the final copolyester or copolyester admixture.
Claim 7
Dependent Claim
38 words
A sheath-core conjugate filament according to claim 1 wherein the core material derives its fiber-forming properties from terephthalate linkages and the sheath is composed of a copolyester, or has as a constituent a copolyester, based on terephthalate units.
Claim 8
Dependent Claim
17 words
A sheath-core conjugate filament according to claim 8 wherein the terephthalate is ethylene terephthalate or tetramethylene terephthalate.
Claim 9
Dependent Claim
30 words
A sheath-core conjugate filament according to claim 1 wherein the core is composed of poly(ethylene terephthalate) and the sheath is composed of a copolyester of ethylene terephthalate and polyoxyethylene terephthalate.
Claim 10
Dependent Claim
186 words
A process for the preparation of a conjugate filament by the Extrusion in sheath-core relationship of a. a stream of molten, fiber-forming, polyester or copolyester based on a simple glycol or copolyester in the molecular chain of which there are, in addition to units based on a simple glycol, poly(alkylene oxide)-containing units selected from the group consisting of oxyethylene and oxypropylene in proportion such as would result from the reaction of less than 5 parts by weight of poly(alkylene oxide) per 100 parts by weight of the final copolyester, and b. a stream of copolyester or admixed copolyester of which the proportion of the structural units containing poly(alkylene oxide) radicals selected from the group consisting of oxyethylene and oxypropylene is such as would result from the reaction of not less than 5 and not greater than 60 parts by weight of poly(alkylene oxide) of average molecular weight 500 per 100 parts by weight of the final copolyester or copolyester admixture, (a) being the core and (b) being the sheath, and allowing the composite stream to solidify to form a filament and subsequently orienting by cold drawing.
Claim 11
Dependent Claim
56 words
A process for the preparation of a conjugate filament according to claim 12 wherein the proportion of the structural units of the copolyester of component (a) containing poly(alkylene oxide) radicals is such as would result from the reaction of not more than 3 parts by weight of poly(alkylene oxide) per 100 parts of the component (a).
Claim 12
Dependent Claim
35 words
A process for the preparation of a conjugate filament according to claim 12 wherein component (b) occupies no less than 5 percent and no more than 40 percent of the cross-sectional area of the filament.
Claim 13
Dependent Claim
38 words
A process for the preparation of a conjugate filament according to claim 12 wherein the poly(alkylene oxide) of average molecular weight at least 500 is of average molecular weight not less than 1,000 and not greater than 20,000.
Claim 14
Dependent Claim
23 words
A process for the preparation of a conjugate filament according to claim 15 wherein the average molecular weight is not greater than 6,000.
Claim 15
Dependent Claim
64 words
A process for the preparation of a conjugate filament according to claim 12 wherein the proportion of the structural units of the copolyester or admixed copolyester of the sheath containing poly(alkylene oxide) radicals is such as would result from the reaction of not more than 40 parts by weight of poly(alkylene oxide) per 100 parts by weight of the final copolyester or copolyester admixture.
Claim 16
Dependent Claim
43 words
A process for the preparation of a conjugate filament according to claim 12 wherein the core material derives its fiber-forming properties from terephthalate units and the sheath is composed of a copolyester, or has as a constituent a copolyester, based on terephthalate units.
Claim 17
Dependent Claim
22 words
A process for the preparation of a conjugate filament according to claim 16 wherein the terephthalate is ethylene terephthalate or tetramethylene terephthalate.
Claim 18
Dependent Claim
26 words
A process according to claim 12 wherein the core material is poly(ethylene terephthalate) and the sheath material is a copolyester of ethylene terephthalate and polyoxyethylene terephthalate.
Claim 19
Dependent Claim
12 words
A textile material composed of, or containing, fibers according to claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |