Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1994-03-07
1995-01-31
Acquah, Samuel A.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428364, 428366, 428370, 428373, 428393, 428395, 428401, D02G 300
Patent
active
053857844
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a dyed polyester fabric having a good color depth, which is comparable to or superior to those of fabrics of natural fibers.
By the term "good color depth" used herein, we mean that the fabric is dyed not only deeply but also with an enhanced brilliancy, i.e., deeply dyed without turbidity and light-brownish coloration.
BACKGROUND ART
Recently, the characteristics of polyester fibers have been remarkably improved. Especially, feeling, touch and drape of polyester fabrics have been improved to a level comparable to that of natural fibers (for example, Japanese Examined Patent Publication No. 61-36099). Nevertheless, appearance, particularly the color depth, of the dyed polyester fabrics is not attractive as compared with those of fabrics of natural fibers such as silk and wool. It is therefore usual that consumers' interest is not excited at the first sight, even though the feeling and other characteristics are improved.
Proposals of improving the dyeability and other dyeing properties have heretofore been made, which include, for example, the copolymerization of a specific comonomer to effect relaxation of the fibrous structure (Japanese Examined Patent Publication No. 63-39686) and the formation of micropores in the surface portion of the fiber to effect diffused reflection (Japanese Examined Patent Publication No. 62-28229). However, dyed polyester fabrics made by these proposals are still not satisfactory in the color depth which term is used in a broad sense in the present specification, i.e., in the color depth with brilliancy, although they are dyed deeply.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a dyed polyester fabric exhibiting a good color depth which is comparable or superior to those of natural fiber fabrics, as well as a good feeling, touch and drape.
In accordance with the present invention, there is provided a dyed polyester fabric composed of warps and wefts, which are dyed with a lightness index L* value of 25 to 65; fibers at least in the surface layer portion of either or both of the weft and the warp exhibiting a light transmittance to an extent such that the difference (.DELTA.X in %) between the light transmittance (X.perp. in %) of polarized light vibrating perpendicular to the fiber axis at a wavelength of the maximum absorption and the light transmittance (X.sup.[ in %) of polarized light vibrating parallel to the fiber axis at the same wavelength is not larger than 10%.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 shows graphs of light transmittances of fibers in the surface layer portion of the yarn constituting an example of the dyed polyester fabric of the present invention;
FIG. 2 shows graphs of light transmittances of fibers of a conventional dyed polyester fabric having an improved feeling;
FIG. 3 is a diagram illustrating the vibrating plane of natural light;
FIG. 4 is a diagram illustrating a principle of color development;
FIG. 5 is a diagram illustrating a light transmittance (A) of polarized light having a vibrating plane parallel to the fiber axis, and a light transmittance (B) of polarized light having a vibrating plane perpendicular to the fiber axis;
FIG. 6 is a diagram illustrating the state wherein dye molecules are distributed in a random manner within a polyester fiber and thus the vibrating planes of natural light which are distributed in all directions are absorbed;
FIG. 7 is a diagram illustrating the state where dye molecules are oriented in one direction within a polyester fiber and thus only one vibrating plane of natural light which is oriented in one direction is absorbed; and
FIGS. 9 through 30 show graphs of light transmittances of fibers in the surface layer portions of the yarns of the dyed polyester fabrics made in Examples 1 through 8 and Comparative Examples 1 through 5, described below .
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is graphs of light transmittances of polarized light through fibers in the surface layer portion of the warp and/or weft constitut
Asada Kaoru
Kasaoka Katsuyuki
Kobayashi Shigenobu
Matsubara Tomio
Sasaki Yoshiyuki
Acquah Samuel A.
Teijin Limited
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