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US4526738A
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US
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Polyester fiber and method for the production thereof
Assignee: Toray Industries Inc
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Filing: 1983-07-08
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Granted: 1985-07-02
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Expires: 2003-07-08
Abstract
Abstract A polyester fiber having a tenacity of at least 4.0 g/d is formed from a copolyester having a degree of polymerization of from 80 to 100 of which copolyester 1.0 to 2.0 mol % of its acid component has a metal sulfoisophthalic group and 0.5 to 1.9 weight % of which copolyester is provided by a glycol component provided by glycol having a molecular weight of from 400 to 6000. The polyester fiber is readily dyed with basic dyes. The polyester fiber can be prepared by spinning the copolyester at a shear rate of≦10 4 sec -1 , a spinning draft ratio of ≦250, a back pressure of the spinneret of≧40 kg/cm 2 and a shear stress of ≦(Q+0.7)×10 7 dyne/cm 2 , where Q is the mass output rate per single hole (g/min).
Inventors
- 👤 Takehiko Miyoshi
- 👤 Tadayuki Matsumoto
- 👤 Keizo Sano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:23
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/86; D01F6/84; C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A polyester fiber having a tenacity of at least 4.0 g/d which fiber comprises a copolyester having a degree of polymerization of from 80 to 100, the copolyester including an acid component and a glycol component, 1.0 to 2.0 mol percent of said acid component being metal sulfoisophthalic residues, and 0.5 to 1.9 weight percent of the copolyester being glycol residues provided by a glycol having a molecular weight of from 400 to 6000.
Claim 2
Dependent Claim
74 words
A polyester fiber having a tenacity of at least 4.0 g/d which fiber comprises a copolyester having a degree of polymerization of from 80 to 100, the copolyester including an acid component and a glycol component, 1.0 to 2.0 mol percent of said acid component being metal sulfoisophthalic residues, and 0.5 to 1.9 weight percent of the copolyester being glycol residues provided by a glycol having a molecular weight of from 400 to 6000.
Claim 3
Dependent Claim
61 words
A polyester fiber according to claim 1, wherein the glycol is a polyalkylene glycol of the formula, A(C.sub.n H.sub.2n O).sub.m H wherein A is selected from C l H 2l+1 O and OH, l is an integer of from 1 to 10, n is an integer of from 2 to 5 and m is an integer of from 3 to 100.
Claim 4
Dependent Claim
21 words
A polyester fiber according to claim 1, wherein the remaining acid component of the copolyester is derived mainly from terephthalic acid.
Claim 5
Dependent Claim
29 words
A polyester fiber according to claim 1, wherein the glycol component is derived mainly from a low molecular weight glycol selected from ethylene glycol and 1, 4 butane diol.
Claim 6
Dependent Claim
60 words
A polyester fiber according to claim 1 wherein the metal sulfoisophthalic residues are provided by a compound which has the formula ##STR4## wherein M is an alkali metal and each of A and A' are, independently of one another, selected from the group consisting of hydrogen, aliphatic hydrocarbon and (CH 2 ) x OH, wherein x is at least 2.
Claim 7
Dependent Claim
18 words
A polyester fiber according to claim 1, which has a cross-section selected from trilobular, quadrilobular and pentalobular cross-sections.
Claim 8
Dependent Claim
37 words
A polyester fiber according to claim 1, which is formed from a copolymer composition additionally including from 0.1 to 4 weight percent of inert inorganic microfine particles having an average diameter of no more than 100 millimicrons.
Claim 9
Independent Claim
121 words
A method for producing a polyester fiber, which method includes spinning a copolyester having a degree of polymerization of from 82 to 105, the copolyester including an acid component, and a glycol component, 1.0 to 2.0 mol percent of said acid component being metal sulfoisophthalic residues and 0.5 to 1.9 weight percent of the copolyester being glycol residues provided by a glycol having a molecular weight of from 400 to 6000 which spinning is effected by a spinneret under the following conditions, Shear rate (γ)≦10 4 sec -1 Spinning draft ratio≦250 Back pressure of spinneret ≧40 kg/cm 2 Shear stress (ζ)≦(Q+0.7)×10 7 dyne/cm 2 wherein Q is the mass output rate per single hole (g/min), and thereafter drawing the resultant fibers.
Claim 10
Independent Claim
121 words
A method for producing a polyester fiber, which method includes spinning a copolyester having a degree of polymerization of from 82 to 105, the copolyester including an acid component, and a glycol component, 1.0 to 2.0 mol percent of said acid component being metal sulfoisophthalic residues and 0.5 to 1.9 weight percent of the copolyester being glycol residues provided by a glycol having a molecular weight of from 400 to 6000 which spinning is effected by a spinneret under the following conditions, Shear rate (γ)≦10 4 sec -1 Spinning draft ratio≦250 Back pressure of spinneret ≧40 kg/cm 2 Shear stress (ζ)≦(Q+0.7)×10 7 dyne/cm 2 wherein Q is the mass output rate per single hole (g/min), and thereafter drawing the resultant fibers.
Claim 11
Dependent Claim
62 words
A method according to claim 8, wherein the glycol of the copolyester is a polyalkylene glycol of the formula A(C.sub.n H.sub.2n O).sub.m H wherein A is selected from C l H 2l+1 O and OH, is an integer of from 1 to 10, n is an integer of from 2 to 5, and m is an integer of from 3 to 100.
Claim 12
Dependent Claim
40 words
A method according to claim 8, wherein the cross-section of the spinneret selected trilobular, quadrilobular and pentalobular cross sections and the shear stress is not more than (0.43Q+0.64)×10 7 dyne/cm 2 , wherein Q is as defined in claim 8.
Claim 13
Dependent Claim
47 words
A method according to claim 8 which includes the preliminary step of providing a composition containing the copolyester, the composition additionally containing from 0.1 to 4 percent by weight of the composition of inert inorganic microfine particles having an average diameter of no more than 100 millimicron.
Claim 14
Dependent Claim
26 words
A method according to claim 11, which includes the subsequent step of alkaline scouring the resultant fiber so as to provide recesses in the fiber surface.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |