Process for treating cellulosic material with formaldehyde in li

Details Process for treating cellulosic material with formaldehyde in li Process for treating cellulosic material with formaldehyde in li

1976-03-02

1982-02-02

Michl, Paul R.

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Cellulose fibers

8125, 81492, D06M 1312

Patent

active

RE0308609

ABSTRACT:
The dimensional stability, crease retention, wrinkle resistance and smooth drying characteristics of a cellulose fiber-containing material such as a cotton fabric are improved by impregnating the material with an aqueous formaldehyde phase and curing the formaldehyde-containing material at high temperature in the presence of catalyst-forming sulfur dioxide while governing the amount of water in the system to provide a self-limiting reaction system, water being the limiting factor in the reaction by which an acid curing catalyst is formed from formaldehyde, sulfur dioxide and water. The aqueous formaldehyde phase may be applied to the material as such, or it may be formed in the material by exposing the latter in a humidified state to formaldehyde vapor. Sulfur dioxide may be introduced into the system either in the course of the aqueous impregnation step or in the curing step.

REFERENCES:
patent: 3642428 (1972-02-01), Getchell et al.
patent: 3653805 (1972-04-01), Gamarra et al.
patent: 3660013 (1972-05-01), Payet et al.
patent: 3663974 (1972-05-01), Watanabe et al.
patent: 3884632 (1975-05-01), Payet et al.

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