Reaction of formaldehyde with cellulose in the presence of phosphoric acid



The extent and rate of reaction between cotton yarn before and after slack mercerization and slack mercerization followed by restretching and formaldehyde in the presence of various amounts of phosphoric acid (10–70% by weight) have been studied. The reaction is very rapid beyond a concentration of 45% phosphoric acid. The reaction has also been studied on mercerized cotton voile in the presence and absence of polyols and ammonium sulfate, and the effect of these substances on combined formaldehyde value and tensile strength of the fabric has been investigated.