Whitening of polyester fibers
AssigneeBayer Aktiengesellschaft
InventorsKlaus Kackstadter, Hans Theidel
Life of this patent
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Abstract
Process for the whitening of polyester fibers or mixed fibers of polyesters and cellulose with dispersion fluorescence whitening agents by the pad-thermosol process in the presence of a water-soluble alkali methal tetraborate, alkali metal silicate, alkali metal aluminium sulphate, alkali metal polyphosphate or alkali metal sulphate.
Claims5
In the process for whitening polyester materials or mixed fibres of polyester and cellulose with a dispersion of a fluorescent coumarin or styryl whitening agent by the pad-thermosol process, the improvement comprising using said fluorescent whitening agent in a liquor also containing 1 to 4 g/l of a water-soluble inorganic salt from the group of alkali metal tetraborate, alkali metal silicate, alkali metal aluminum sulphate, alkali metal polyphosphate or alkali metal sulphate.
A composition of matter comprising a dispersion containing 60-250 g/kg. of fluorescent coumarin or styryl whitening agent and 150-200 g/kg of a water soluble inorganic salt of the formula
- Me.sub.2 B.sub.4 O.sub.7, Me.sub.2 SiO.sub.3, Me.sub.2 Si.sub.2 O.sub.5, MeAl(SO.sub.4).sub.2, Me.sub.m+2 P.sub.m O.sub.3m+1, Me.sub.n P.sub.n O.sub.3n, or Me.sub.2 SO.sub.4
- in which
- m is 2-10.sup.6 ;
- n is 3-8;
- and
- Me is sodium or potassium.
Dependencies are inferred from the claim text.