Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1997-11-21
1999-11-16
Kunz, Gary L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
536118, 536102, 536 92, 536 84, 536 59, 536 57, C07H 1312, C07H 100
Patent
active
059860871
DESCRIPTION:
BRIEF SUMMARY
Viscose fiber has essentially the same dyeing characteristics as cotton fiber. The dyeing of natural or regenerated cellulosic fiber therefore requires the presence of alkali-donating agents and also electrolytes in order that satisfactory fixation results may be obtained with reactive dyes.
However, there is also a need for regenerated cellulose fiber which can be dyed with cationic dyes under neutral conditions. Such a fiber, for example in a blend with acrylic fiber, would make it possible to dye the two fiber portions in a single bath and would offer time and hence economic advantages in the dyeing process as well as ecological advantages.
It is an object of the present invention to provide regenerated cellulose fiber which behaves like acrylic fiber as regards dyeing with cationic dyes under weakly acidic conditions.
This object is surprisingly achieved by admixture to a viscose dope, to alkali cellulose or to a cellulose solution of a sulfonated starch derivative or a polymeric sulfonic acid.
The present invention accordingly provides sulfonated regenerated cellulose fiber obtained by adding a modifier to a viscose dope or alkali cellulose or cellulose solution and spinning fiber therefrom, wherefor the modifier is a starch etherified with C.sub.2 -C.sub.5 -alkylsulfonic acid radicals and having a degree of substitution of 0.1 to 3, a starch admixed with vinylsulfonic acid or a styrenesulfonic acid, or a polymeric styrenesulfonic acid or polymeric vinylsulfonic acid.
The etherified starches have a degree of substitution between 0.1 and 3. A degree of substitution of 3 means that every one of the three free OH groups is etherified in every glucose unit. A degree of substitution of 0.1 means that, on average, every tenth glucose unit has one etherified OH group.
Sulfonated starches having a degree of substitution of about 0.05 are known per se (Houben-Weyl, 1987, vol. E 20, part 3, pages 2135-2151), but sulfonated starches having a degree of substitution of 0.1 or higher have not been described before.
The present invention therefore also provides above-described (C.sub.2 -C.sub.5)-alkylsulfonic acid-etherified starches having a degree of substitution between 0.1 and 3, preferably 0.11 to 2, in particular 0.2 to 1.
Preference for the purposes of the present invention is given to those starch ethers whose ether group has the formula --O--(CH.sub.2).sub.x --SO.sub.3 M or --O--CH.sub.2 --CHOH--CH.sub.2 --SO.sub.3 M, where M is hydrogen, an alkali metal, such as Li, Na or K, or an alkaline earth metal, such as Mg or Ca, and x is 2 or 3. Particular preference is given to those starch ethers whose ether group has the formula --O--CH.sub.2 CH.sub.2 --SO.sub.3 M or --O--(CH.sub.2).sub.3 --SO.sub.3 M.
The novel starch ethers having said high degree of substitution form as approximately 20% strength solutions in water fluent to highly viscous materials ranging in viscosity from 2 to 25 Pas, which, in the production of the regenerated cellulose fiber, can be added to the spinning dope, alkali cellulose or cellulose solution without further workup.
The degree of polymerization of the starch ethers of this invention is advantageously between 100 and 1000, preferably 200 and 600, anhydroglucose units. If the degree of polymerization were smaller than 100, the starch ether could be washed out of the fiber after spinning.
The starch ethers of this invention are prepared by reacting any desired starch, for example potato starch, maize starch or wheat starch, with a substituted C.sub.2 -C.sub.5 -alkylsulfonic acid whose substituent or substituents is or are reactive toward OH groups, having for example an .alpha.-chloro-.beta.-hydroxy, a 1,2-epoxy or a 1-(sulfatoethyl sulfone) group, or with a cyclic sulfonate at a pH of 9 to 14, preferably of from 10 to 13. The reaction temperature is advantageously 15 to 80.degree. C. The C.sub.2 -C.sub.5 -alkyl-sulfonic acid is reacted in a molar ratio of alkyl-sulfonic acid:one anhydroglucose unit of 0.1:1 to advantageously 4:1, depending on the degree of substitution desired for th
REFERENCES:
patent: H493 (1988-07-01), Tegiacchi et al.
patent: 3066032 (1962-11-01), Fukushima et al.
Huber Bernd
Schrell Andreas
DyStar Textilfarben GmbH & Co. Deutschland KG
Kunz Gary L.
LandOfFree
Sulfonation of regenerated cellulose with sulfonated polymers an does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sulfonation of regenerated cellulose with sulfonated polymers an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sulfonation of regenerated cellulose with sulfonated polymers an will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1326424