Process for the whitening of textile fibres of polyesters
AssigneeBayer Aktiengesellschaft
InventorsKlaus Kackstaedter, Hans Theidel
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Abstract
Process for whitening textile fibres of polyesters or blended fibres of polyesters and cellulose or wool with dispers fluorescent whitening agents according to a combined exhaustion and thermo-fixing process, in the presence of auxiliaries e.g. esters in combination with water-soluble alkali metal salts or ampholytes which are capable of forming an aqueous two-phase system.
Claims3
In the process for whitening textile fibers of polyester, of polyester blended with cotton or of polyester blended with wool, with a dispersed fluorescent whitening agent by the process of exhaustion from an aqueous liquor and subsequent thermofixation;
- the improvement comprising enhancing the whitening effect by utilizing a two-phase aqueous liquor containing an ester capable of forming a second phase and a water-soluble alkali metal salt or an ampholyte.
Dependencies are inferred from the claim text.