Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
2001-05-16
2003-10-21
Yamnitzky, Marie (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S375000, C428S378000, C428S394000, C008S456000, C008S464000, C008S115700, C008S920000, C008S922000, C008S926000
Reexamination Certificate
active
06635347
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a dyed mixed fiber article composed of fiber dyeable with disperse dye (hereinafter referred to as “disperse dyeable fiber) and polyurethane fiber, and a method for fast-dyeing the mixed fiber article with disperse dye, more specifically to a dyed mixed fiber article composed of disperse dyeable fiber and polyurethane fiber, which is excellent in color value and color fastness, and a method for fast-dyeing the mixed fiber article.
BACKGROUND ART
When a mixed fiber fabric composed of a disperse dyeable fiber, typically polyethylene terephthalate fiber, and a polyurethane fiber is dyed with disperse dye, there is a problem in that since the disperse dye is excessively adsorbed in the polyurethane fiber, the color fastness of the dyed mixed fiber fabric is significantly lowered. To solve this problem, it is necessary to remove the disperse dye excessively adsorbed in the polyurethane fiber by reduction clearing of the dyed fabric.
Since the disperse dye excessively adsorbed in the polyurethane fiber in the mixed fiber article is difficult to sufficiently remove therefrom by reduction clearing, however, it is impossible to obtain a dyed mixed fiber article satisfactory in color fastness. Particularly, a dyed mixed fiber fabric dyed with disperse dye is weak, in color fastness, to perspiration-alkali.
There has also been a problem in color fastness to dry cleaning of the dyed mixed fiber fabric. This is because a dry cleaning liquid becomes significantly dirty to reversely contaminate the white part of the fabric or other fibers. A cause of the contamination of the dry cleaning liquid is the disperse dye remaining in the polyurethane fiber, and the degree of contamination of the dry cleaning liquid is approximately proportional to the residual concentration of the disperse dye. For this reason, it is necessary to carry out reduction clearing of the dyed mixed fiber article dyed with disperse dye under severe conditions wherein the concentration of a reduction agent and an alkaline agent is higher than the ordinary level, for example, 10 g/l, and a treatment temperature is as high as 90° C. to intensify the rinsing conditions. In a mixed fiber article such as a covering yarn having a high covering degree of polyurethane fiber, however, even if the reduction clearing condition becomes severe, it is impossible to remove the disperse dye in the polyurethane fiber to a satisfactory extent, and the color value of the disperse dyeable fiber is lowered to aggravate the shade variation in every dyeing batch.
To obviate such a problem, there may be a case wherein dyes easily decomposable by the alkali reduction clearing are used, such as heterocyclic azo type, condensation type or diester type disperse dyes. This is problematic, however, because it is difficult to obtain all colors with such dyes and the price of the dye is high. Also, since spandex is excessively deeply dyed, no improvement is seen in the mismatching and unevenness of color shades. Under the existing circumstances now stands, deep dyed articles of clothings having a, sufficient color fastness have not been obtained especially in the outer wears and inner wears (under wear).
Also, for the purpose of suppressing the adsorption of dye in spandex, disperse dyeable fiber is initially dyed and then mixed with non-dyed spandex to result in a mixed fiber fabric having a high color fastness.
In Japanese Examined Patent Publication (Kokoku) No. 62-38479, a method for improving a color fastness, especially that to laundering, is proposed wherein a mixed fiber article containing elastomeric polyester filament is dyed with disperse dye and then treated with an aqueous solution of tannic acid and tartar emetic, although it is irrelevant to a mixed fiber article containing elastomeric polyurethane fiber. However, there is a problem in that, since a large amount of disperse dye remains in the elastomeric polyester filament itself, a dry cleaning liquid is significantly contaminated therewith when the mixed fiber article is subjected to a dry cleaning. Also, color fastness to perspiration does not reach a satisfactory level.
Accordingly, at present, there is no superior mixed fiber fabric which is high in color fastness, low in contamination of dry cleaning liquid. Since disperse dye is excessively adsorbed in the polyurethane fiber in the mixed fiber fabric composed of fiber dyeable with disperse dye and polyurethane fiber, the color value of the disperse dyeable fiber becomes, lower to result in a product with a poor appearance.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a dyed mixed fiber article composed of disperse dyeable fiber and polyurethane fiber excellent in wet color fastness such as that to perspiration-alkali or to washing. Another object of the present invention is to provided a method for fast color dyeing a mixed fiber article composed of disperse dyeable fiber and polyurethane fiber with the disperse dye at a predetermined color density while suppressing the dyeing of the polyurethane fiber.
The present invention is a dyed mixed fiber article composed of disperse dyeable fiber and polyurethane fiber, having a color fastness to a perspiration-alkali of grade 3or higher according to JIS L-0848-A Method and a surface color depth of 20 or less in term of color value L.
Preferably, the dyed mixed fiber article composed of disperse dyeable fiber and polyurethane fiber further satisfies at least one of a color fastness to perspiration-alkali of grade 4 or higher according to JIS L-0848-A Method and a dry cleaning liquid contamination value of grade 3 or higher according to JIS L-0860-A Method.
If the dyed mixed fiber article according to the present invention has a perspiration-alkali of grade 4 or higher according to JIS L-0848-A Method, the disperse dyeable fiber forming the mixed fiber article is preferably dyed with heterocyclic azo type, condensation type or diester type disperse dyes.
A degree of color depth of the polyurethane fiber contained in the mixed fiber article is preferably 60 or less. Thus, it is possible to maintain a wet color fastness of grade 3 or higher even if the dyed fiber mixed article according to the present invention is a piece-dyed product dyed with disperse dye.
A ratio of the polyurethane fiber to the disperse dyeable fiber in the dyed mixed fiber article according to the present invention is generally 40% or less. The mixing ratio may be suitably selected in accordance with forms or uses of the mixed fiber article. The remaining component in the mixed fiber article, i.e., the disperse dyeable fiber, may be mixed with wool, cotton, silk, ramie, cuprammonium rayon, viscose rayon or others. In a composite article composed of disperse dye dyeable fiber and another fiber such as cellulose fiber which is not dyeable with disperse dye, two-bath dyeing may be adopted, wherein the method according to the present invention is applied when the disperse dyeable fiber is dyed, and then the cellulose fiber is dyed with a direct dye or a reactive dye.
Alternatively, a mixed fiber article may be initially dyed by the method according to the present invention, and then further dyed by one-bath dyeing or two-bath dyeing, whereby the dyed mixed fiber article excellent in color fastness according to the present invention is obtainable.
A mixed fiber article composed of disperse dyeable fiber and polyurethane fiber may of a yarn structure and a fabric structure.
Examples of the yarn structure include a so-called covering yarn in which a bare yarn of the polyurethane fiber (having a thickness of 10 to 500 dtex) is covered with the disperse dye dyeable fiber (single and double covering yarns), a twisted yarn, a core yarn, or an entangled yarn.
On the other hand, examples of the fabric structure include a knit fabric, a woven fabric, a non-woven fabric and a composite fabric thereof (such as a laminated fabric). Concretely, there is an on-machine mixed fiber fabric in which bare yarns or covering yarns of the polyurethane fiber are arrang
Asahi Kasei Kabushiki Kaisha
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Gray J. M.
Yamnitzky Marie
LandOfFree
Blended dyed product of fiber dyeable with disperse dye and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Blended dyed product of fiber dyeable with disperse dye and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Blended dyed product of fiber dyeable with disperse dye and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3137270