Fluorescent Brightener for Paper Industries
VIOPHOR BA CONC PDR Specially developed for high temperature stable product and gives very strong neutral white effects. Most suitable by exhaust application on cellulose fiber, polyamide, silk and wool and their blends and in paper industries for high whiteness paper.
Appearance Pale Yellow powder
Chemical constitution Stilbene Derivative
Ionic properties Anionic
Hue (Shade) Neutral White Effect
Solubility 40 to 50 grams per liter in cold soft water
Compatibility Not compatible with cationic auxiliaries .
pH of 1% aqueous solution 8-9
Application in paper
VIOPHOR BA CONC PDR should be added where the stock is vigorously agitated. For discontinuous addition, e.g. in the pulpier, beater or mixing chest, it is advisable to prepare highly dilute VIOPHOR BA CONC PDR solution and to prevent mottling. Generally 0.2 to 0.3% VIOPHOR BA CONC PDR powder to the weight of dry Pulp is sufficient for the medium degree of whiteness. However in special cases VIOPHOR BA CONC PDR powder up to 0.5% of the weight of dry pulp can be used to get very high degree of whiteness.
Stability in the wash liquor
Good. The intensity of white effect is not affected by chemicals causing hardness
Good. VIOPHOR BA CONC PDR is stable for considerable periods. In strongly alkaline media even at temperatures above 100*C.
Good. Peroxide additions to the wash liquor do not impair the intensity of the white effect.
Poor, VIOPHOR BA CONC PDR. Is slowly destroyed in a hypochlorite solution but when fixed on the goods it has good fastness to chlorine.
Stable if stored away from sunlight under roof and cool condition.
Toxicology & Ecology
VIOPHOR BA CONC PDR. Doesn’t: present any special hazard when used for the recommended applications provided the usual elementary safety and hygiene rules for handling chemicals are observed.