The invention is directed to cross-linked cellulose fibers wherein cellulose pulp is fluffed, aerated, and exposed to a reaction mixture comprising formaldehyde, hydrochloric acid and formic acid as finely divided droplets or vapors. The thus treated fibers are cured by subjecting the fibers to a hot...http://www.google.es/patents/US4204055?utm_source=gb-gplus-sharePatente US4204055 - Cross-linked cellulose fibers
