Whitening of polyester fibers

Claim 2

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.

Claim 3

Process of claim 1 in which a sodium salt of a polyphosphoric acid is used as the water-soluble inorganic salt.

Claim 4

Process of claim 1 in which a fluorescent whitening agent having the formula A, B 1 , B 2 , B 3 , B 4 , C, D, E or F __________________________________________________________________________ A ##STR7## B ##STR8## (B.sub.1) R is C.sub.6 H.sub.5, and R.sub.1 is CH.sub.3 ; (B.sub.2) R is C.sub.2 H.sub.5, and R.sub.1 is CH.sub.3 ; -(B.sub.3) R is COOC.sub.2 H.sub.5 and R.sub.1 is C.sub.6 H.sub.5 ; (B.sub.4) R is H, and R.sub.1 is NHCOCH.sub.3; C ##STR9## R is H, CH.sub.3, C.sub.2 H.sub.5, CH.sub.3O or C.sub.2 H.sub.5O; D ##STR10## E ##STR11## F ##STR12## __________________________________________________________________________ is used.

Claim 5

Process of claim 1 in which a compound 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, wherein m is 2-10 6 ; n is 3-8; and Me sodium or potassium; is used as the water-soluble inorganic salt.

Claim 6

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 6 ; n is 3-8; and Me is sodium or potassium.

Claim 7

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 6 ; n is 3-8; and Me is sodium or potassium.