Claims
- 1. A hollow water-absorbing polyester filament textile material, comprising hollow polyester filaments each having at least one hollow extending in parallel to the longitudinal axis of said filament, and a number of caves distributed in at least a portion of the body of said filament and consisting of a number of fine outside concaves formed in the peripheral surface of said filament, a number of fine pores formed within the body of said filament, a number of fine inside concaves formed in the hollow surface of said filament, and a number of fine channels through which said pores are connected to each other, and to said outside concaves and inside concaves, said outside and inside concaves and said pores extending approximately in parallel to the longitudinal axis of said filament, which textile material has been prepared by the process comprising the steps of:
- (A) preparing core-in-sheath type composite filaments in each of which (1) a sheath constituent comprises a blend of (a) a principal polyester component comprising an acid moiety comprising at least one aromatic dicarboxylic acid or its ester-forming derivative and a glycol moiety comprising at least one alkylene glycol having 2 to 6 carbon atoms or its ester-forming derivative, with (b) a cave-forming agent which comprises at least one member selected from the group consisting of
- (i) copolyesters which comprise a glycol compound moiety, and an aromatic dicarboxylic acid compound moiety and an additional divalent organic sulfonic acid compound moiety of the formula (II): ##STR15## wherein Z represents a member selected from the group consisting of trivalent aromatic hydrocarbon radicals and trivalent aliphatic hydrocarbon radicals, M.sup.1 represents a member selected from the group consisting of hydrogen and metal atoms, R.sup.1 represents an ester-forming organic radical, and R.sup.2 represents a member selected from the group consisting of a hydrogen atom and ester-forming organic radicals;
- (ii) phosphorus compounds of the formula (III): ##STR16## wherein R.sup.3 represents a monovalent organic radical, X represents a member selected from the group consisting of --OR.sup.4, wherein R.sup.4 represents a hydrogen atom or a monovalent organic radical, --OM.sup.3, wherein M.sup.3 represents a metal atom, and a monovalent organic radical, M.sup.2 represents a metal atom, and m represents zero or 1, and;
- (iii) aromatic carboxy-sulfonic acid compounds of the formula (IV): ##STR17## wherein Y represents a member selected from the group consisting of a hydrogen atom and ester-forming organic radicals, M.sup.4 represents a metal atom, M.sup.5 represents a metal atom, and n represents an integer of 1 or 2, and (2) the core constituent consists of a polymeric material having a higher degree of alkali solubility than that of said sheath constituent;
- (B) converting said core-in-sheath type composite filaments into a desired type of textile material; and
- (C) removing at least a portion of said cave-forming agent, the entire core constituent, and a portion of said principal polyester component from said core-in-sheath type composite filaments in said textile material by treating it with an alkali aqueous solution.
- 2. The textile material as claimed in claim 1, which textile material is a hard twist yarn having a twist coefficient of 10,000 or more.
- 3. The textile material as claimed in claim 1, which textile material is a false twisted textured yarn.
- 4. The textile material as claimed in claim 1, wherein each of said outside and inside concaves and said pores has a longitudinal size of at the largest 50 times the lateral size thereof, which is in a range of from 0.01 to 3 microns.
- 5. The textile material as claimed in claim 1, wherein said additional divalent organic sulfonic acid moiety in said copolyester (i) is used in an amount corresponding to 2 to 16 molar percent of said aromatic dicarboxylic acid moiety.
- 6. The textile material as claimed in claim 1, wherein said copolyester (i) is used in an amount of 5 to 100 parts by weight per 100 parts by weight of said principal polyester component.
- 7. The textile material as claimed in claim 1, wherein said additional divalent organic sulfonic acid moiety of the formula (II) is selected from the group consisting of sodium and potassium 3,5-di(carbomethoxy) benzene sulfonates.
- 8. The textile material as claimed in claim 1, wherein said cave-forming agent (b) consists of at least one said phosphorus compound (ii) and is used in a molar amount corresponding to 0.3% to 15% of said acid moiety in said principal polyester component (a).
- 9. The textile material as claimed in claim 1, wherein said phosphorus compound of the formula (III) is selected from the group consisting of monomethyldisodium phosphate, dimethylmonosodium phosphate, monomethylmonosodium phosphate, monoethyldisodium phosphate, monohydroxethyldisodium phosphate, monophenyldisodium phosphate, monomethyl-dilithium phosphate, and monomethyldipotassium phosphate.
- 10. The texile material as claimed in claim 1, wherein said cave-forming agent (b) comprises said aromatic carboxy-sulfonic acid compound of the formula (IV) and is used in a molar amount corresponding to 0.3% to 15% of said acid moiety in said principal polyester component (a).
- 11. The textile material as claimed in claim 1, wherein said aromatic carboxy-sulfonic acid compound of the formula (II) is selected from the group consisting of 3-carbomethoxy-sodium benzensulfonate-5-carboxylic sodium salt, 3-carbomethoxy-sodium benzenesulfonate-5-carboxylic potassium salt, 3-carbomethoxy-potassium benzenesulfonate-5-carboxylic potassium salt, 3-hydroxyethoxycarbonyl-sodium benzenesulfonate-5-carboxylic sodium salt, 3-hydroxyethoxycarbonyl-sodium benzene-sulfonate-carboxylicmagnesium salt, 3-carboxy-sodium benzenesulfonate-5-carboxylic sodium salt, sodium benzenesulfonate-3, 5-dicarboxylic disodium salt, and sodium benzenesulfonate-3, 5-dicarboxylic monomagnesium salt.
- 12. The textile material as claimed in claim 1, wherein said alkali aqueous solution contains at least one alkaline compound selected from the group consisting of sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide, sodium carbonate, and potassium carbonate.
- 13. The textile material as claimed in claim 1, wherein the longitudinal size of each of said outside and inside concaves and said pores corresponds to 20 times or less the lateral size thereof.
- 14. The textile material as claimed in claim 1, wherein said hollow filament consists essentially of a polyester having at least 90% by a molar amount of recurring units of the formula (I): ##STR18## wherein l represents an integer of 2 to 6.
- 15. The textile material as claimed in claim 14, wherein said polyester is a polyethylene terephthalate.
- 16. The textile material as claimed in claim 14, wherein said polyester is a polybutylene terephthalate.
- 17. The textile material as claimed in claim 1, wherein the entire cross-sectional area of said hollow in said filament corresponds to 10% to 30% of the entire cross-sectional area of said filament including said hollow.
- 18. The textile material as claimed in claim 1, wherein the total sum of the cross-sectional areas of said outside and inside concaves and pores corresponds to 5% to 30% of the cross-sectional area of said filament excluding said hollow.
- 19. The textile material as claimed in claim 1, wherein said filament has a denier of 10 or less (a dtex of 11.1 or less).
- 20. The textile material as claimed in claim 1, wherein the tensile strength of said filament is 2.0 g/d or more.
- 21. The textile material as claimed in claim 1, wherein said hollow filament has a water-absorbing rate of at least 120 seconds per 0.04 ml of water.
- 22. The textile material as claimed in claim 1, wherein said hollow filament has an absorption percentage of at least 50%.
- 23. The textile material as claimed in claim 1, wherein said hollow filament exhibits a degree to fibrillation of 10% or less.
- 24. The textile material as claimed in claim 1, wherein the total sum of the opening areas of said outside concaves correspond to 2% to 50% of the entire peripheral surface area of said filament.
Priority Claims (2)
Number |
Date |
Country |
Kind |
54-94189 |
Jul 1979 |
JPX |
|
54-115730 |
Sep 1979 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 171,335, filed July 23, 1980, now U.S. Pat. No. 4,361,617.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
Country |
Parent |
171335 |
Jul 1980 |
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