Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1995-10-27
1998-05-19
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428393, 536 57, D02G 300, C08B 1600
Patent
active
057533679
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to disperse dye-dyeable regenerated cellulose fiber and a method for producing the same, and a textile product containing the fiber. More specifically, the present invention relates to a textile product comprising the fiber and a polyester fiber, and a method for dyeing the same products.
TECHNICAL BACKGROUND
Heretofore, regenerated cellulose fibers represented by viscose rayon and cuprammonium rayon have been dyed with direct dyes, reactive dyes or indanthrene dyes. It has been impossible to dye regenerate cellulose fibers with other dyes (e.g., disperse dyes).
However, dyeing with these dyes which have so far been used has never been satisfactory. For example, direct dyes are not satisfactory in color fastness in some colors, and although dyeing with reactive dyes gives good color fastness, reactive dyes are expensive and have a problem on productivity because dyeing for long hours with alkalis under high pH values and high temperatures is necessary. Further, indanthrene dyes have drawbacks that they are expensive and lack general purpose-properties since usable colors are limited.
As seen, for example, in cationization or anionization, a history of study to improve dyeability of regenerated cellulose fiber is long, but these means given therefrom do not provide satisfactory color fastness and also result in substantial lowering in fiber strength due to addition of various compounds to fiber, and thus lack practicability, and are now not industrially conducted.
Thus, although various attempts have so far been made to improve dyeability of regenerated cellulose fiber, fully satisfactory results have not been obtained when assessment is made taking up to color fastness and physical properties of fiber into account.
On the other hand, regenerated cellulose fiber has come to be frequently used, in resent years, together with synthetic fibers such as polyester fiber, in order to make the best use of excellent hygroscopicity and peculiar feeling of regenerated cellulose fiber for outer clothing.
However, as mentioned above, regenerated cellulose fiber is dyed with direct or reactive dye, whereas polyester fiber is dyed with disperse dye. Thus, when fabric or knitted webs comprising regenerated cellulose fiber and polyester fiber are dyed, there are troublesomeness that the polyester fiber should be dyed with disperse dye and regenerated cellulose fiber should be dyed with reactive or direct dye.
Although this dyeing process is a process actually carried out at present, the process takes long time to dye regenerated cellulose fiber, and it is the present state of things that dyeing treatment of the order of only 3 batches a day per one dyeing machine is made at most. On the other hand, when polyester fiber alone is dyed with disperse dye, dyeing treatment of the order of 9 batches a day per one dyeing machine is possible.
Dyeing treatment ability on woven fabric or knitted webs comprising regenerated cellulose fiber and polyester fiber is extremely lower than that on woven fabric or knitted webs comprising polyester fiber alone so that dyeing costs of the former become higher. The higher dyeing costs are a cause of weakening the competitive position of woven fabric or knitted webs comprising regenerated cellulose fiber and polyester fiber against woven fabric or knitted webs comprising polyester fiber alone.
Even though, from the above point of view, if regenerated cellulose fiber dyeable with disperse dye as in polyester fiber were obtained, the above troublesomeness at the time of dyeing could be solved all at once, there has been no idea or emphasis to make regenerated cellulose fiber practically dyeable with disperse dyes as in the present invention.
Furthermore, not based on dyeing fiber, there is also known a spun-dyed fiber comprising adding various inorganic pigments to spinning solution for regenerated cellulose fiber, and a method comprising adding previously colored organic fine particles to spinning solution in order to improve the drawbacks of inorg
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Aruga Mitutake
Hirakawa Kiyoshi
Inoue Ichirou
Iwasa Eiji
Kawamura Tsutomu
Edwards Newton
Kuraray Co. Ltd.
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