Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Woven fabric
Reexamination Certificate
2000-09-19
2004-06-29
Morris, Terrel (Department: 1771)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Woven fabric
C442S364000, C057S243000, C057S244000, C057S908000, C057S246000
Reexamination Certificate
active
06756329
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a synthetic fiber capable of absorbing and disabsorbing moisture, entangled and mixed yarn using the same, knitted and woven fabrics using the same, and the transparency of nonwoven fabric using the same.
BACKGROUND OF THE INVENTION
Synthetic fiber is superior to natural fiber such as cotton in the property of tensile strength, abrasion resistance, dimensional stability, a quick drying, and broadly used in the field of clothing material. However, synthetic fiber does not have the superior moisture absorption as in natural fiber, and by perspiration in wearing, there occur over humidity and tackiness to skin, resulting in poorer comfortable wearing than natural fiber.
On this account a lot of trials in various ways have been carried out to give moisture absorption and water absorption to synthetic fiber. For example, a moisture absorbing fiber, having a value of equal to or more than 2.5% or 1.5%, respectively, in terms of &Dgr;MR using polyetherester amide as moisture absorbing component, is disclosed in JP-A-9-41204 or JP-A-9-41221. &Dgr;MR is a difference between moisture content of fiber allowed to stand in the atmosphere of 30° C.×90%RH for 24 hours and moisture content of fiber allowed to stand in the atmosphere of 20° C.×65%RH for 24 hours, defined as a moisture absorbing and disabsorbing coefficient.
&Dgr;MR is, however, a value which is calculated from moisture contents of the fiber after allowed to stand under different conditions of temperature and humidity for 24 hours. It is practically important for synthetic fiber to absorb or desorb moisture quickly when a condition of temperature and humidity has changed. However, JP-A-9-41204 or JP-A-9-41221 does not give any suggestion about this fact.
On the other hand, JP-A-63-227871, JP-A-63-227872, or the like suggest comfortable materials for apparel with a capability of absorbing and disabsorbing moisture, and also describe the moisture absorbing rate after 15 min. when the material is moved from the circumstance of 20° C.×65%RH to the circumstance of 30° C.×90%RH, and also the moisture disabsorbing rate after 15 min. when the material is moved from the circumstance of 30° C.×90%RH to the circumstance of 20° C.×65%RH. However, the technology mentioned in these document is related to moisture of a absorbing component to a surface of knitted and woven fabrics made of polyester or polyamide fiber by graft polymerization, and results in disadvantages such as harsh touch, and slippy touch, uneven dyeing, a marked reduction in color fastness upon wetting.
Moreover, in general, many of thermoplastic polymers with superior capability of moisture absorption and water absorption are originally colored or have a tendency of gradual coloring with time, resulting in deterioration of quality and grade of fiber goods. For example, a compound fiber with superior moisture absorbing and disabsorbing capability is disclosed in JP-A-8-209450, JP-A-8-311719 or the like. In these documents, modified polyethyleneoxide is used as a component with a moisture absorbing and disabsorbing capability to provide fiber with a superior moisture absorbing and disabsorbing. The documents, however, describe that diisocyanate compounds are used as a modifier for polyethyleneoxide, but they fail to give any suggestion that a change in color tone of fiber materials is successfully controlled. A modified polyethyleneoxide mentioned in examples (a product name: Aquacoke) is modified with aromatic diisocyanate compounds, and the fiber has a problem of gradual change in color tone.
In U.S. Pat. No. 4767825, a nonwoven fabric which is composed of a water absorbing polymer with polyoxymethylene soft segment and hard segment is suggested. This nonwoven fabric, however, is excellent in moisture absorbing and disabsorbing, a property of fiber and fiber-forming, but has a problem of color yellowing or of poor weather-resistance when used long.
A technical subject of the present invention is to provide a synthetic fiber with a superior moisture absorbing and disabsorbing capability, which exhibits a moisture absorption or desorption function according to the condition of temperature and humidity of atmosphere and can exhibit the moisture absorbing and disabsorbing function repeatedly with changes in temperature and humidity, which has less tendency toward a change in color tone, especially yellowing, in storage over a long period of time, which has no problems in touch or dyeability when used as clothing materials; entangled and mixed yarn, knitted and woven fabrics, and nonwoven fabric using the above mentioned synthetic fiber.
DISCLOSURE OF THE INVENTION
The present invention is achieved as a result of having studied zealously to solve above mentioned subjects.
A synthetic fiber capable of absorbing and disabsorbing moisture of the present invention comprising a component capable of absorbing and disabsorbing moisture component and a fiber-forming polymer has a moisture absorption of 1.5% or more when it is allowed to reach a moisture equilibrium under the circumstance of 25° C.×60%RH and then is allowed to stand for 30 min. under the circumstance of 34° C.×90%RH, and has a moisture disabsorption of 2% or more when it is allowed to reach a moisture equilibrium under the circumstance of 34° C.×90%RH and then is allowed to stand for 30 min. under the circumstance of 25° C.×60%RH. The fiber also has a value of −1 to 5 in terms of b value in the CIE-LAB color system when it is allowed to stand for 30 days.
In the entangled and mixed yarn of the present invention, the first fiber comprising the above described synthetic fiber capable of absorbing and disabsorbing moisture and the second fiber comprising a polyester fiber are entangled and blended. The above described yarn blend has a mixing weight ratio of (the first fiber)/(the second fiber)=20/80 to 80/20, and the first fiber has a higher boiling water shrinkage than the second fiber.
The knitted and woven fabrics of the present invention is principally constituted by the above mentioned entangled and mixed yarn.
The nonwoven fabric of the present invention is constituted by a synthetic fiber capable of absorbing and disabsorbing moisture having the structure of moisture absorbing and disabsorbing component located in the core and fiber-forming polymer located in the sheath. The above mentioned moisture absorbing and disabsorbing component is a modified polyalkylene oxides obtained as the reaction product of polyalkylene oxides, polyols and aliphatic diisocyanates, and the fiber-forming polymer in the sheath component is obtained from polyamide or polyester.
The modified polyalkylene oxide core component has a weight ratio of 5 to 30 weight % based on the weight of the total fiber. The nonwoven fabric has a designated structure of the bonded structure through the sheath components of the synthetic fiber or of three-dimensional entanglement of the synthetic fiber.
Consequently in the present invention there is provided that a synthetic fiber with a superior moisture absorbing and disabsorbing capability, which exhibits a moisture absorption or desorption function according to the condition of temperature and humidity of atmosphere and can exhibit the moisture absorbing and disabsorbing function repeatedly with changes in temperature and humidity, which has less tendency toward a change in color tone, especially yellowing, in storage over a long period of time, which has no problems in touch or dyeability when used as clothing materials; entangled and mixed yarn, knitted and woven fabrics, and nonwoven fabric using the above mentioned synthetic fiber.
Embodiments
The detailed description of the present invention will be given in the following paragraph.
The synthetic fiber capable of absorbing and disabsorbing moisture of the present invention comprises the moisture absorbing and the disabsorbing component and the fiber-forming polymer. It is necessary that the fiber has a moisture absorption o
Akasaki Kunio
Kurushima Yoshiaki
Murakami Shiro
Murase Shigemitsu
Ono Kazuyuki
Harness & Dickey & Pierce P.L.C.
Morris Terrel
Unitika Ltd.
Wachtel Alexis
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