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AssigneeInternational Paper Company
InventorsAngel Stoyanov, Joerg Endres, Holger Beruda, Ludwig Busam
Estimating the term…
Bleached polycrylic acid crosslinked cellulose fibers with reduced furfurai content are disclosed. The reduced furfural content is accompanied by a strong reduction of malodor associated with crosslinked fibers. Methods of furfurai reduction include treatment with hydrogen peroxide in the absence of alkaline or other bleaching agents subsequent to curing polyacrylic acid crosslinked cellulose fibers. Some embodiments of treated polycrylic acid crosslinked cellulose fibers have a furfural content lower than 1.3 ppm. In some embodiments, the reduction of furfural content of the treated crosslinked fibers compared to untreated crosslinked fibers is at least 55%. in some embodiments, furfural content decreases with aging of the treated crosslinked fibers.
A method of reducing the furfural content of polyacrylic acid crosslinked cellulosic fibers, the method comprising treating the polyacrylic acid crosslinked cellulosic fibers with hydrogen peroxide alone in the absence of sodium hydroxide, in a bleaching stage subsequent to a curing stage, to polyacrylic acid crosslinked cellulosic fibers, in an amount of from about 0.1 to about 20 pounds (about 0.045 to about 9.07 kg) per ADMT of fiber and at a hydrogen peroxide pH of between about 4.5 and about 5, wherein the amount of furfural in the treated crosslinked fibers reduces from a first value determined at one day after the treatment of the crosslinked fibers to a second, subsequent value determined at 12 days, 14 days, or 21 days after treatment.
A method of reducing the malodor associated with the presence of furfural in polyacrylic acid crosslinked fibers comprising applying hydrogen peroxide in the absence of alkaline agents to the crosslinked fibers subsequent to curing the crosslinked fibers and reducing the furfural content of the crosslinked fibers by at least about 55% at 12 days after hydrogen peroxide application, compared to a furfural content of polyacrylic acid crosslinked fibers that have not been treated with hydrogen peroxide after curing, at day 0.
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