REDUCED FURFURAL CONTENT IN POLYACRYLIC ACID CROSSLINKED CELLULOSE FIBERS

• Main Authors: BUSAM Ludwig, BERUDA Holger, ENDRES Jörg, STOYANOV Angel
• Format: Patent
• Language: English; Spanish
• Published: 08.06.2021
• Subjects: APPARATUS THEREFOR; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; IMPREGNATING OR COATING OF PAPER; LAUNDERING; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS; PULP COMPOSITIONS; REGENERATION OF PULPING LIQUORS; TEXTILES; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS

Bleached polycrylic acid crosslinked cellulose fibers with reduced furfural content are disclosed. The reduced furfural content is accompanied by a strong reduction of malodor associated with crosslinked fibers. Methods of furfural 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. Se describen fibras de celulosa entrelazadas con ácido poliacrílico blanqueadas que exhiben contenido reducido de furfural; el contenido reducido de furfural va acompañado de una fuerte reducción del mal olor asociado con las fibras entrelazadas; los métodos de reducción del furfural incluyen el tratamiento con peróxido de hidrógeno en ausencia de agentes de blanqueo alcalinos u otros agentes de blanqueo, subsiguiente a la curación de las fibras de celulosa entrelazadas con ácido poliacrílico; algunas modalidades de las fibras de celulosa entrelazadas con ácido poliacrílico tratadas tienen un contenido de furfural menor de 1.3 ppm; en algunas modalidades, la reducción del contenido de furfural de las fibras entrelazadas tratadas en comparación con las fibras entrelazadas no tratadas es de por lo menos 55%; en algunas modalidades, el contenido de furfural disminuye con el envejecimiento de las fibras entrelazadas Tratadas.