EP0207489A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Highly-shrinkable polyester fiber, process for preparation thereof, blended polyester yarn and process for preparation thereof
Assignee: Teijin Ltd
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Filing: 1986-07-01
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Granted: —
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Expires: 2006-07-01
Abstract
Abstract A highly-shrinkable polyester fiber composed of a polyester comprising ethylene terephthalate units as main recurring units and having a birefringence ( DELTA n) of from 0.130 to 0.165, wherein the boiling water shrinkage is at least 30% and the peak temperature and peak value of the thermal stress are 90 to 105 DEG C and at least 0.4 g/de, respectively. The fiber has excellent shrinkability as well as high heat resistance, dimensional stability and alkali resistance and provides a blended polyester yarn excellent in bulkiness and hand.
Inventors
- 👤 Takumi Shimazu
- 👤 Hiroyuki Nagai
- 👤 Masakazu Fujita
- 👤 Masahiro Matsui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 17:22
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/098; D01F; D01F6/00; D01F6/58; D01F6/62; D02; D02G; D02G1/00; D02G1/18
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
A highly-shrinkable polyester fiber composed of a polyester comprising ethylene terephthalate units as main recurring untis and having a birefringence (An) of from 0.130 to 0.165, wherein the boiling water shrinkage is at least 30% and the peak temperature and peak value of the thermal stress are 90 to 105°C and at least 0.4 g/de, respectively.
Claim 2
Dependent Claim
56 words
A highly-shrinkable polyester fiber composed of a polyester comprising ethylene terephthalate units as main recurring untis and having a birefringence (An) of from 0.130 to 0.165, wherein the boiling water shrinkage is at least 30% and the peak temperature and peak value of the thermal stress are 90 to 105°C and at least 0.4 g/de, respectively.
Claim 3
Dependent Claim
19 words
A highly-shrinkable polyester fiber as set forth in claim 1, wherein the birefringence (An) is not less than 0.133.
Claim 4
Dependent Claim
20 words
A highly-shrinkable polyester fiber as set forth in claim 1, wherein the boiling water shrinkage is not higher than 45%.
Claim 5
Dependent Claim
92 words
A process for the preparation of a highly-shrinkable polyester fiber, comprising extruding a melt of a polyester having ethylene terephthalate units as main recurring units from a spinneret into an atmosphere maintained at a temperature not lower than 200°C, cooling and solidifying the extrudate by blowing cooling air to the extrudate, travelling the resulting filamentary yarn in an atmosphere heated at 120 to 160°C and extending along a length of 80 to 200 cm in the yarn travelling direction, and taking up the yarn at a speed of 4,000 to 6,000 m/min.
Claim 6
Dependent Claim
92 words
A process for the preparation of a highly-shrinkable polyester fiber, comprising extruding a melt of a polyester having ethylene terephthalate units as main recurring units from a spinneret into an atmosphere maintained at a temperature not lower than 200°C, cooling and solidifying the extrudate by blowing cooling air to the extrudate, travelling the resulting filamentary yarn in an atmosphere heated at 120 to 160°C and extending along a length of 80 to 200 cm in the yarn travelling direction, and taking up the yarn at a speed of 4,000 to 6,000 m/min.
Claim 7
Dependent Claim
23 words
A process as set forth in claim 4, wherein the temperature for the extrusion of the polyester melt is not lower than 290°C.
Claim 8
Dependent Claim
44 words
A process as set forth in claim 4, wherein the zone of the polyester melt-extruding atmosphere maintained at a temperature not lower than 200°C extends along a length of at least 13 cm from the surface of the spinneret in the yarn travelling direction.
Claim 9
Dependent Claim
50 words
A process as set forth in claim 4, wherein the cooling solidification of the extruded yarn is effected by blowing cooling air maintained below 20°c along a length of 100 to 150 cm to the yarn which has passed through the atmosphere maintained at a temperature not lower than 200°C.
Claim 10
Dependent Claim
35 words
A blended polyester yarn comprising a highly-shrinkable polyester ; fiber as defined in claim 1 in admixture with a lowly-shrinkable polyester fiber having a boiling water shrinkage lower than that of said highly-shrinkable polyester fiber.
Claim 11
Dependent Claim
23 words
A blended polyester yarn as set forth in claim 8, wherein the birefringence of the highly-shrinkable polyester fiber is not less than 0.133.
Claim 12
Dependent Claim
25 words
A blended polyester yarn as set forth in claim 8, wherein the boiling water shrinkage of the highly-shrinkable polyester fiber is not higher than 45%.
Claim 13
Dependent Claim
25 words
A blended polyester yarn as set forth in claim 8, wherein the boiling water shrinkage of the lowly-shrinkable polyester fiber is not higher than 12%.
Claim 14
Dependent Claim
32 words
A blended polyester yarn as set forth in claim 8, wherein the difference in boiling water shrinkage between the highly-shrinkable polyester fiber and the lowly-shrinkable polyester fiber is not less than 30%.
Claim 15
Dependent Claim
39 words
A blended polyester yarn as set forth in claim 8, wherein the ratio (A/B) of the monofilament denier (A) of the highly-shrinkable polyester fiber to the monofilament denier (B) of the lowly-shrinkable polyester fiber is not less than 1.5.
Claim 16
Dependent Claim
16 words
A blended polyester yarn as set forth in claim 8, wherein the blended yarn has entanglements.
Claim 17
Dependent Claim
23 words
A blended polyester yarn as set forth in claim 8, wherein the number of the entanglements is 5 to 70 per 1 meter.
Claim 18
Dependent Claim
53 words
A process for the preparation of a blended polyester yarn, comprising blending a highly-shrinkable polyester fiber having a boiling water shrinkage of at least 30% and obtained by a process as defined in claim 4 with a lowly-shrinkable polyester fiber having a boiling water shrinkage lower than that of said highly-shrinkable polyester fiber.
Claim 19
Dependent Claim
23 words
A process as set forth in claim 16, wherein the temperature for the extrusion of the polyester melt is not lower than 290°C.
Claim 20
Dependent Claim
44 words
A process as set forth in claim 16, wherein the zone of the polyester melt-extruding atmosphere maintained at a temperature not lower than 200°C extends along a length of at least 13 cm from the surface of the spinneret in the yarn travelling direction.
Claim 21
Dependent Claim
50 words
A process as set forth in claim 16, wherein the cooling solidification of the extruded yarn is effected by blowing cooling air maintained below 20°C along a length of 100 to 150 cm to the yarn which has passed through the atmosphere maintained at a temperature not lower than 200°C.
Claim 22
Dependent Claim
23 words
A process as set forth in claim 16, wherein the boiling water shrinkage of the highly-shrinkable polyester fiber is not higher than 45%.
Claim 23
Dependent Claim
23 words
A process as set forth in claim 16, wherein the boiling water shrinkage of the lowly-shrinkable polyester fiber in not higher than 12%.
Claim 24
Dependent Claim
30 words
A process as set forth in claim 16, wherein the difference in boiling water shrinkage between the highly-shrinkable polyester fiber and the lowly-shrinkable polyester fiber is not less than 30%.
Claim 25
Dependent Claim
24 words
A process as set forth in claim 16, wherein the highly-shrinkable fiber and the lowly-shrinkable fiber are blended by a compressed air entangling treatment.
Claim 26
Dependent Claim
25 words
A process as set forth in claim 16, wherein the number of the entanglements applied to the yarn is 5 to 70 per 1 meter.
References Cited (Backward Citations)
No citation records indexed.
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