Basf Aktiengesellschaft

Wilfried Kothe

Wolfgang Schenk

Heinz-Dieter Angstmann

Karl H Popp

Wolfgang Grunwald

In addition to the very time-consuming enzymatic and hydrolytic desizing processes, oxidative degradation of starch size by means of persulfate, to render the starch water-soluble, is conventionally practised. Because of the chemical similarity between starch and cellulose, oxidative degradation of the cellulose is unavoidable in this desizing process. The invention overcomes this problem by breaking up the macromolecules of the starch into dispersible fragments by means of such small amounts of persulfate that neither is the starch made water-soluble nor is the cellulose significantly damaged, the dispersants employed for the fragments being relatively oxidation-stable polymers of unsaturated carboxylic acids.

Desizing of textiles consisting of or containing cellulose

A method of processing regenerated liquors of polyacrylate, polyvinyl alcohol and carboxymethylcellulose (CMC) sizes for reuse, wherein the impurities are substantially removed, without noticeably changing the properties of the size, by constantly aerating the liquor and separating off the precipitate thereby formed.

Purification of regenerated sizing liquors

A process for desizing and bleaching textile goods containing, or consisting of, cellulose, by simultaneous enzymatic desizing and pretreatment with a solution of sodium dithionite and a conventional heavy metal complexing agent in the presence of a buffer system at pH 6-9 and subsequent conventional peroxide bleaching in the presence of little or no silicate as a stabilizer. The process improves the bleaching effect and the economics and reduces the risk of fiber damage or destruction or of silicate deposits without an additional treatment stage.

Growing community of inventors

Ludwigshafen, Germany

Wilfried Kothe