C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 251/68 (2006.01) D21H 21/30 (2006.01)
Patent
CA 2553556
The instant invention relates to concentrated aqueous solutions of hexasulphonated stilbene optical brighteners which are storage-stable in the absence of solubilizing agents like urea. By removal of salts resulting from the preparation of the optical brightener one can obtain a concentration of up to 0.350 mol/kg without losing storage stability. The reduced water content enables coating compositions which require less drying energy and which show less water and binder migration into the paper.
La présente invention porte sur des solutions aqueuses concentrées d'azureurs optiques de stilbène hexasulfoné qui sont stables au stockage en l'absence d'agents solubilisants tels que l'urée. En éliminant les sels provenant de la préparation de l'azureur optique, il est possible d'obtenir une concentration allant jusqu'à 0,350 mole/kg sans perdre la stabilité au stockage. La teneur en eau réduite permet d'obtenir des compositions de couchage qui nécessitent moins d'énergie de séchage et dont la migration de l'eau et du liant dans le papier est réduite.
Clariant Finance (bvi) Limited
Kirby Eades Gale Baker
LandOfFree
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